September Weather in Highlands, United States

Last updated: February 24, 2025

In September, the weather in the Highlands, United States offers a delightful mix of warmth and occasional rain. With a maximum temperature reaching 31°C (88°F) and an average of 20°C (69°F), the days can feel quite pleasant. However, temperatures can dip to a minimum of 6°C (43°F), especially in the early mornings and evenings. The month brings about a total precipitation of 149 mm (5.9 in) over 11 days, contributing to a humidity level of 76% that enhances the lushness of the surrounding landscape. This blend of warmth and moisture creates a unique environment, making September a transitional period as summer wanes and autumn approaches.

September Temperature in Highlands

As September rolls into the Highlands, United States, temperatures begin to showcase a remarkable transition from the warmth of summer to the cool embrace of fall. With minimums averaging around 6°C (43°F) and pleasant average highs reaching 20°C (69°F), the month maintains a balmy atmosphere reminiscent of the last summer days. It's not uncommon to experience maximum temperatures peaking at 31°C (88°F), allowing for a delightful blend of lingering warmth and the beginnings of autumn's chill. This gradual shift in climate signifies not only a change in weather but also a transformation in the surrounding landscape as vibrant foliage starts to emerge. Overall, September stands out as a month of refreshing warmth and delightful coolness, inviting residents and visitors alike to savor the beauty of nature as it prepares for the seasonal transition ahead.

September Weather in Highlands: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Highlands, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec404550566470737268604743
Data source: Temperature data for Highlands generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Highlands

In September, the Highlands of the United States experience a moderate 149 mm (5.9 in) of precipitation over 11 days, signaling a transition as summer's warmth gives way to autumn's embrace. This amount is a slight decrease from the previous month, August, which boasted 171 mm (6.7 in) despite having the same number of days with rain. Interestingly, September's rainfall is consistent with the general trend of drier conditions that tend to emerge as the seasons shift, reflecting a gradual decline in precipitation leading into the fall months. The consistent moisture levels enjoyed throughout the summer provide a lush backdrop, while the onset of autumn brings a refreshing crispness to the air, making September a unique and dynamic month for weather enthusiasts and nature lovers alike.

September Precipitation Trends in Highlands

The chart displays monthly precipitation patterns in Highlands, with values for each month alongside September's data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September's conditions compare to those of other months.
JanFebMarAprMayJunJulAugSepOctNovDec124186141155162125123171149181106158
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Highlands

In the Highlands of the United States, September marks a shift in humidity levels, dropping to 76%—a continuation of the drier conditions established in August. This decline represents a noticeable transition from the high humidity of the earlier months, where levels hovered around an impressive 86% from January to March. As summer gives way to fall, humidity typically eases, with September's figures aligning closely with the post-summer dip seen in August. This pattern suggests a brief, refreshing reprieve before the humidity begins to rise once more in October, returning to 80% as the year progresses towards its wetter months. Overall, the seasonal rhythm is clear: stifling humidity gives way to a more comfortable atmosphere, making September a pleasant month in the Highlands.

September Average Humidity in Highlands

This chart illustrates the average monthly humidity levels in Highlands, with September's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how September's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%86%82%85%85%83%76%76%80%88%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Highlands

As summer transitions into autumn in the Highlands, United States, September offers a very high UV Index of 10, with a burn time of just 15 minutes—a subtle decline from the intense extreme levels experienced throughout the peak months of May to August. This month marks a gradual shift as sunlight begins to wane, yet vigilance against UV exposure remains essential. The UV Index trend illustrates a steady rise from January's moderate level of 4, peaking in the spring and summer before beginning its descent in fall. As you enjoy the crisp September days, remember to protect your skin—check out the detailed UV exposure data for your safety at Highlands UV Index.

Maximum UV Index Levels in Highlands for September

The chart shows the monthly maximum UV Index (UVI) for Highlands in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec478111211111110864
Data source: Highlands September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

September Sunshine in Highlands

As summer gently shifts into autumn, September in the Highlands welcomes a striking 287 hours of sunshine, marking a graceful transition from the sun-drenched peak of July, which boasts an impressive 338 hours. This month reflects a steady rhythm of daylight, falling slightly from the August total of 310 hours, yet still shimmering with ample sunlight for outdoor adventures and scenic views. The trend of increasing sunshine hours from January through July culminates in this vibrant September, before the days begin to shorten as October approaches, bringing 262 hours. These patterns not only highlight the Highlands' appeal during the warmer months but also paint a vivid picture of the changing seasons, inviting both residents and visitors to savor the beauty of autumn under the radiant sun.

Monthly Sunshine Duration in Highlands: September Highlighted

The September sunshine duration represents the total number of hours Highlands experiences direct sunlight during the month of September, excluding cloudy or obstructed periods. This chart compares the sunshine duration of September with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec162h170h233h270h298h314h338h310h287h262h231h189h
Data source: Highlands September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Highlands During September

September in the Highlands, United States, offers a refreshing 50% chance of sunny weather, marking it as a notable improvement over the summer months, where sun chances linger around just 31% to 35%. This month emerges as a sweet spot, balancing the fading warmth of summer with an inviting likelihood for clear skies. Interestingly, the sunny disposition of September sits just above the springtime average, hinting at a seasonal transition where nature begins to embrace cooler temperatures without sacrificing sun-soaked days. As autumn approaches, residents and visitors alike can look forward to enjoying a delightful blend of sunshine and early fall colors, making September a particularly appealing time to explore the Highlands.

Percentage of Sunny Days in September in Highlands

The chart illustrates the percentage of sunny days in Highlands throughout the year, with September highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Highlands experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec42%39%38%55%32%31%33%35%50%40%57%38%
Data source: Highlands September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Highlands in September

As September ushers in the transition from summer to autumn in the Highlands of the United States, the average daylight duration dips to a respectable 12 hours. This marks a gradual decline from the peak summer months of June and July, where daylight stretched to 14 hours. Following the vibrant months of blossoming foliage and long sunny days, September serves as a gentle reminder of the impending shorter days ahead. Notably, the steady increase in daylight from January to June highlights a significant seasonal shift that enriches the region's natural beauty, while the subsequent decrease through October reflects the encroaching autumn atmosphere. This rhythm of daylight not only shapes the landscape but also influences the activities and moods of those who call the Highlands home.

Average Daylight Hours in Highlands for September

The chart illustrates the variation in daylight duration in Highlands throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec10h 5m10h 55m11h 59m13h 5m14h14h 27m14h 13m13h 24m12h 20m11h 15m10h 18m9h 49m
Data source: Highlands daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Highlands

As September rolls in across the Highlands of the United States, the winds subtly begin to shift, reflecting the gradual transition from the summer lull. With an average wind speed of 1.7 m/s (4 mph), the breezes are gentle yet noticeable, slightly picking up from the tranquil days of July and August. This minor uptick marks a return to the more typical autumn wind patterns, hinting at the seasonal changes to come. Historically, September's winds are still among the mellowest of the year, but they're a precursor to a steady increase in gusts as we move into October and November, where average speeds tend to rise once again. This delicate balance between calm and briskness beautifully captures the essence of early autumn in the Highlands, where each breeze carries the promise of colorful foliage and cooler days ahead.

Average September Wind Speed in Highlands

The chart displays monthly wind speed patterns in Highlands, with values for each month shown alongside September's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how September's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec2.32.42.32.52.11.71.41.51.7 m/s1.92.12.1
Data source: Highlands September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Highlands Compares to Other Months

The weather in Highlands changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of September's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Highlands and find detailed weather information for every month.

September and January exhibit stark contrasts in weather conditions. In September, temperatures range from a minimum of 6°C (43°F) to a maximum of 31°C (88°F), with an average of 20°C (69°F). The humidity is relatively high at 76%, and the month sees significant rainfall, totaling 149 mm (5.9 in) over 11 days. In contrast, January features much colder temperatures, with a minimum of -14°C (7°F) and an average of just 4°C (40°F). The maximum reaches 22°C (71°F), but the overall climate is chillier, with higher humidity at 86%. Precipitation in January is slightly lower at 124 mm (4.9 in) over 10 days. For more detailed insights on January weather, you can visit Highlands weather in January.

September and February present contrasting weather conditions. In September, temperatures range from a mild 6°C (43°F) to a warm 31°C (88°F), with an average of 20°C (69°F), making it a pleasant month for outdoor activities. However, it also witnesses significant rainfall, totaling 149 mm (5.9 in) over 11 days and a humidity level of 76%. In contrast, February experiences cooler temperatures, with a minimum of -6°C (22°F) and a maximum of 23°C (74°F), averaging at 7°C (45°F). This month tends to be wetter, with 186 mm (7.3 in) of precipitation spread over 14 days and a higher humidity of 86%. For more information about February weather, check Highlands weather in February.

September and March present distinct contrasts in weather patterns. In September, temperatures range from a mild 6°C (43°F) at night to a warm 31°C (88°F) during the day, with an average of 20°C (69°F). Despite being relatively warm, September experiences considerable precipitation of 149 mm (5.9 in) over about 11 days, accompanied by a humidity level of 76%.

In contrast, March has cooler temperatures, with a minimum of -7°C (20°F) and an average of 10°C (50°F), while still reaching a maximum of 28°C (82°F). Although precipitation levels are slightly lower at 141 mm (5.6 in) over 14 days, the humidity is slightly higher at 86%. This comparison highlights the transition from the tail end of summer in September to the early spring chill of March. For more details on March weather, you can visit Highlands weather in March.

In comparing the weather of September and April, September tends to be warmer with average temperatures around 20°C (69°F), peaking at 31°C (88°F). In contrast, April features cooler conditions, with average temperatures of 14°C (57°F) and a maximum of 27°C (81°F). Both months experience similar levels of precipitation, with September receiving 149 mm (5.9 in) over 11 days and April receiving slightly more at 155 mm (6.1 in) across 10 days. Humidity levels are also notably high in both months, with September at 76% and April slightly higher at 82%. For more details on the specific conditions during April, you can visit Highlands weather in April.

In September, the weather tends to be warmer overall, with average temperatures around 20°C (69°F) and maximums reaching up to 31°C (88°F). The month experiences a moderate amount of rainfall, with 149 mm (5.9 inches) over 11 days, and humidity levels are also relatively high at 76%.

In contrast, May starts off cooler, with minimum temperatures dropping to around 1°C (35°F) and average highs of 30°C (86°F). There’s slightly more precipitation at 162 mm (6.4 inches) over 12 days, and humidity is a bit higher at 85%. For a more detailed look at the May weather, check out Highlands weather in May.

Overall, while both months feature a mix of warmth and rainfall, September offers warmer temperatures, whereas May is characterized by cooler nights and slightly increased humidity.

When comparing the weather in September to that of June, notable differences emerge. In September, temperatures range from a minimum of 6°C (43°F) to a maximum of 31°C (88°F), with an average of 20°C (69°F). The month sees a higher total precipitation of 149 mm (5.9 in) over 11 days, coupled with a humidity level of 76%. In contrast, June typically experiences milder conditions, with temperatures ranging from 10°C (49°F) to 30°C (87°F) and an average of 21°C (70°F). Although June has less total precipitation at 125 mm (4.9 in), it has more rainy days, totaling 17, and slightly higher humidity at 85%. For a more detailed look at June weather specifics, you can check Highlands weather in June.

When comparing the weather in September and July, a few key differences emerge. September experiences a wider temperature range, with minimums dipping down to 6°C (43°F) and maximums reaching 31°C (88°F), leading to an average of 20°C (69°F). In contrast, July has generally warmer conditions, with minimum temperatures of 13°C (56°F), an average of 23°C (73°F), and maximums peaking at 32°C (89°F). Additionally, September sees higher precipitation levels at 149 mm (5.9 in) over 11 days, compared to July's 123 mm (4.9 in) spread across 19 days, indicating that September tends to have more intense but fewer rainy days. The humidity also fluctuates slightly, with September at 76% and July at 83%. For more detailed insights, you can check Highlands weather in July.

In comparing the weather of September to that of August, September features a cooler range with minimum temperatures dropping to 6°C (43°F), while August maintains higher minimums at 13°C (56°F). Both months experience similar maximum temperatures, peaking at around 31°C (88°F) in September and 31°C (89°F) in August. Precipitation levels are slightly reduced in September, totaling 149 mm (5.9 in) over 11 days, compared to August's 171 mm (6.7 in) over 17 days. Despite the variability in rainfall, humidity remains consistent at 76% for both months. For a more detailed look at August’s climate, check out Highlands weather in August.

September and October exhibit notable weather differences as the seasons transition. In September, temperatures range from a pleasant minimum of 6°C (43°F) to a maximum of 31°C (88°F), with an average of 20°C (69°F). The month experiences 149 mm (5.9 in) of precipitation over 11 days, and humidity levels are relatively high at 76%. Conversely, October starts to feel much cooler, with temperatures dipping to a minimum of -2°C (28°F) and still reaching a maximum of 33°C (91°F), averaging 16°C (60°F). Precipitation increases slightly to 181 mm (7.1 in) over the same number of rainy days, with humidity also rising to 80%. For more detailed insights into the October climate, check out Highlands weather in October.

September and November present noticeable contrasts in weather patterns. In September, temperatures range from a mild 6°C (43°F) at night to a warm average of 20°C (69°F), peaking at a high of 31°C (88°F). The month experiences considerable rainfall, with 149 mm (5.9 in) spread over 11 days and a humidity level of 76%. In contrast, November sees much cooler temperatures, with lows dipping to -6°C (21°F) and an average of 9°C (48°F), while highs reach a pleasant 24°C (75°F). Although November receives less precipitation at 106 mm (4.2 in) over 9 days, the humidity rises to 88%, contributing to an overall chillier feel. For more detailed information, you can refer to Highlands weather in November.

In September, the weather is generally warm with temperatures ranging from a minimum of 6°C (43°F) to a maximum of 31°C (88°F), and an average of 20°C (69°F). This month experiences a moderate amount of precipitation, totaling 149 mm (5.9 in) over 11 days, with a humidity level of 76%. Conversely, December brings a stark contrast, with temperatures dropping significantly, featuring a minimum of -11°C (12°F), an average of 6°C (43°F), and a maximum of 23°C (74°F). Precipitation is slightly higher at 158 mm (6.2 in) but occurs over just 10 days, accompanied by heightened humidity at 88%. For more details, you can explore Highlands weather in December.

Compare Highlands's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Highlands

In September, the Highlands experience a delightful transition from summer to autumn, characterized by mild temperatures and increased humidity. Unlike the sweltering heights of summer, the average temperature settles around a comfortable 20°C (69°F), making outdoor activities even more enjoyable. However, with 149 mm of precipitation spread over 11 days, September can be a bit wet, contributing to the lush beauty of the landscape. This month notably stands out for its balance of warmth and moisture, offering a refreshing change that prepares the region for cooler fall days. For a deeper dive into the region’s weather patterns, visit Highlands Climate.