September Weather in Boone, United States

Last updated: February 24, 2025

In Boone, United States, the weather in September presents a delightful transition into autumn. With a maximum temperature soaring to 28°C (83°F), the days remain pleasantly warm, while the average temperature settles around a comfortable 18°C (65°F). Nights can bring a refreshing chill, dipping to a minimum of 3°C (38°F). This month also sees 134 mm (5.3 in) of precipitation spread over 13 days, contributing to a lush and vibrant landscape. The humidity averages 68%, creating a cozy, inviting atmosphere ideal for outdoor activities and enjoying the changing foliage.

September Temperature in Boone

In September, Boone experiences a delightful transition into fall, marked by a noticeable drop in temperatures from the summer's warmth. The month opens with crisp mornings, as the minimum temperature hovers around 3°C (38°F), while pleasant afternoons bring an average of 18°C (65°F), peaking at a comfortable 28°C (83°F). This gentle cooling trend not only signifies the retreat of summer heat but also prepares residents for the chilling onset of winter. As the days grow shorter and the air turns fresher, September offers the perfect backdrop for outdoor activities, with its mild and inviting climate making it a favorite among locals and visitors alike.

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

The chart illustrates September temperature patterns in Boone, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec344044526166706864564238
Data source: Temperature data for Boone generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Boone

In September, Boone experiences a notable transition in precipitation patterns, with a total of 134 mm (5.3 in) of rain falling over 13 days. This amount reflects a slight dip compared to the wetter summer months of July and August, yet it remains significant for early autumn. The consistent rainfall during this period not only helps replenish local water sources but also aids in the vibrant color change of foliage, making September a visually stunning time in the region. As the year progresses, the precipitation begins to stabilize, leading into the drier months of October and November, which see a marked decrease in both rainfall and rainy days. The trends indicate a shift from the lushness of summer to a more tempered, but still refreshing, climate as Boone prepares for the cooler fall and winter seasons.

September Precipitation Trends in Boone

The chart displays monthly precipitation patterns in Boone, 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.
JanFebMarAprMayJunJulAugSepOctNovDec9713812115514814512414713414682117
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Boone

In September, Boone, United States experiences a noticeable shift in humidity as it gradually transitions from the heavier, muggy summer months into the crispness of fall. With an average humidity of 68%, September marks a low compared to August's 66%, hinting at the onset of drier conditions. This trend of decreasing humidity from summer, where levels peak at 79% in July, to the crispness of autumn is a refreshing change for residents and visitors alike. As the month progresses, the humidity begins to rise again in October, reaching 78%, but September serves as a delightful buffer, bringing a touch of relief with its mild and manageable humidity.

September Average Humidity in Boone

This chart illustrates the average monthly humidity levels in Boone, 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.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%86%84%83%83%79%66%68%78%89%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Boone

As summer transitions to fall in Boone, North Carolina, the UV Index in September shows a slight decrease to 10, categorizing it as very high and suggesting a burn time of just 15 minutes. This dip follows several months of extreme exposure, where the UV Index remained consistently at 11 from May through August. As we move into October, the UV Index further recedes to 8, indicating continuing high levels of UV radiation. This trend highlights the importance of sun protection as the year progresses, particularly during the warm months. To stay informed about UV levels throughout the year, visit Boone UV Index.

Maximum UV Index Levels in Boone for September

The chart shows the monthly maximum UV Index (UVI) for Boone 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.
JanFebMarAprMayJunJulAugSepOctNovDec468111111111110863
Data source: Boone 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 Boone

As summer fades into fall, September brings a heartwarming glow to Boone, U.S., with an impressive 282 hours of sunshine. This month, while not quite matching the peak brightness of July with 355 hours, still offers a generous dose of golden rays that linger longer than in earlier months. September’s sunshine is a delightful transition from the summer’s abundant light; it supports outdoor activities while hinting at the cool embrace of autumn just around the corner. Interestingly, the gradual decline in sunlight hours from the summer months sets a thoughtful tone for the change of seasons ahead, echoing the natural rhythm of the year as Boone prepares for the cozy embrace of October and beyond.

Monthly Sunshine Duration in Boone: September Highlighted

The September sunshine duration represents the total number of hours Boone 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.
JanFebMarAprMayJunJulAugSepOctNovDec152h182h245h264h303h319h355h318h282h264h231h187h
Data source: Boone September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Boone During September

In Boone, the likelihood of sunny weather showcases a notable trend as the year progresses. September, with a 49% chance of sunshine, is a delightful transition into fall, marking a peak in sunny days just before the shift to the cooler, cloudier months of October and November. This increase in sunshine from the summer months, particularly August's 40%, hints at a pleasantly warm autumn atmosphere. In contrast to the winter months characterized by lower probabilities of sunny weather—ranging from 33% in February to 38% in January—September stands out as a time when the sun still shines brightly, making it an ideal month for outdoor activities and enjoying the changing leaves.

Percentage of Sunny Days in September in Boone

The chart illustrates the percentage of sunny days in Boone 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 Boone experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec38%33%40%53%32%33%45%40%49%36%54%41%
Data source: Boone September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Boone in September

As September arrives in Boone, the days begin to shorten, marking the transition from summer's long, sunlit hours to the cozy embrace of autumn. With 12 hours of daylight, September sees a gentle decline from the vibrant 14 hours enjoyed during the peak of summer months like June and July. This gradual decrease, from 14 hours in August to 12 hours, hints at the approaching cooler seasons, while still providing ample time for outdoor adventures under the crisp blue skies. The rhythm of daylight from January’s brief 9 hours slowly swells to a spring crescendo and then wanes again, reflecting nature's predictable yet captivating cycle. As the leaves begin to turn, Boone's daylight journey continues to evolve, inviting residents to relish those sunlit moments just a little longer before the days grow even shorter.

Average Daylight Hours in Boone for September

The chart illustrates the variation in daylight duration in Boone throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 59m10h 52m11h 59m13h 8m14h 5m14h 34m14h 18m13h 27m12h 21m11h 13m10h 13m9h 43m
Data source: Boone daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Boone

As September arrives in Boone, United States, the wind begins to whisper a gentle change, with an average speed of 2.1 m/s (5 mph). This marks a slight revival from the summer months when the winds were at their calmest, often dipping below 2 m/s. Compared to July and August, when breezes brushed the landscape at only 1.9 m/s (4 mph) and 1.7 m/s (4 mph) respectively, September’s winds hint at the approach of fall, bringing a refreshing touch to the air. While still on the lighter side, this increase sets the stage for October's 2.5 m/s (5 mph) winds, suggesting that as the leaves begin to turn, Boone's breezes will pick up in both speed and vitality, welcoming the crispness of autumn.

Average September Wind Speed in Boone

The chart displays monthly wind speed patterns in Boone, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.03.23.03.22.32.11.91.72.1 m/s2.52.72.6
Data source: Boone September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Boone Compares to Other Months

The weather in Boone 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 Boone and find detailed weather information for every month.

In September, the weather in Boone showcases a mild and pleasant climate, with average temperatures ranging from a cool 3°C (38°F) at night to a warm 28°C (83°F) during the day. This month sees relatively high humidity at 68% and receives about 134 mm (5.3 in) of precipitation over 13 days. In stark contrast, January brings much colder conditions, with average temperatures hovering around 1°C (35°F) and nighttime lows plunging to -17°C (1°F). Although January is slightly drier with 97 mm (3.8 in) of precipitation over 11 days, the humidity rises to 87%, contributing to a brisk winter atmosphere. For a more detailed look at Boone's weather in January, visit Boone weather in January.

September and February present strikingly contrasting weather conditions. In September, temperatures range from a mild 3°C (38°F) to a warm 28°C (83°F), with a comfortable average of 18°C (65°F). Though the month sees about 134 mm (5.3 in) of rainfall over approximately 13 days, humidity levels hover around 68%, contributing to a pleasant early autumn atmosphere. In contrast, February experiences a significant drop in temperatures, with a minimum of -13°C (8°F) and an average of just 4°C (40°F), while highs reach up to 23°C (75°F). The month brings slightly more precipitation at 138 mm (5.4 in) over 15 days and higher humidity levels at 87%, creating a notably colder and wetter environment. For more detailed insights, check Boone weather in February.

September and March present contrasting weather patterns despite having similar maximum temperatures of 28°C (83°F). In September, temperatures range from a comfortable minimum of 3°C (38°F) to an average of 18°C (65°F), accompanied by a moderate humidity of 68%. Precipitation is relatively high, with 134 mm (5.3 in) recorded over 13 days. Conversely, March experiences much colder conditions, with temperatures dropping to a minimum of -12°C (11°F) and an average of 7°C (45°F). The humidity is noticeably higher at 86%, and while precipitation is slightly less at 121 mm (4.7 in) over 14 days, the overall feel is much chillier. For more detailed information, you can check Boone weather in March.

In comparing the weather between September and April, it's evident that both months have their unique characteristics. September features milder temperatures, with a minimum of 3°C (38°F) and an average of 18°C (65°F), peaking at a comfortable 28°C (83°F). Conversely, April starts cooler with a minimum temperature of -6°C (21°F) and averages around 11°C (52°F), reaching a maximum of 26°C (79°F).

While September has 134 mm (5.3 in) of precipitation over 13 days, April experiences slightly higher precipitation at 155 mm (6.1 in) across the same number of days. Humidity levels are also different, reaching 68% in September compared to a higher 84% in April. For more detailed insights about April weather, you can visit Boone weather in April.

In comparing the weather of September and May, September generally offers warmer temperatures, with an average of 18°C (65°F) and maximums reaching up to 28°C (83°F), compared to May's cooler average of 16°C (61°F). However, May experiences slightly lower minimum temperatures, dipping to -2°C (30°F), whereas September remains milder with a minimum of 3°C (38°F). Both months receive significant precipitation, with May averaging 148 mm (5.8 in) over 16 days and September totaling 134 mm (5.3 in) across 13 rainy days. Lastly, the humidity is noticeably higher in May at 83%, compared to September's 68%. For more information on the specific conditions, you can check Boone weather in May.

When comparing the weather in September to June, both months exhibit similar maximum temperatures, peaking at around 28°C (84°F). However, September tends to be slightly cooler overall, with average temperatures of 18°C (65°F) compared to June's average of 19°C (66°F). Precipitation is notably higher in June, with 144 mm (5.7 in) falling over 17 days, while September receives 134 mm (5.3 in) across 13 days. Additionally, the humidity is higher in June at 83%, compared to 68% in September, making June feel more muggy. For more detailed insights on the June weather in Boone, you can check Boone weather in June.

When comparing the weather in September to that of July, notable differences emerge. September experiences cooler temperatures, with a minimum of 3°C (38°F) and an average of 18°C (65°F), while July boasts warmer conditions, with a minimum of 11°C (51°F) and an average of 21°C (70°F). July tends to be slightly drier, receiving 124 mm (4.9 in) of precipitation over 17 days, compared to September's 134 mm (5.3 in) over 13 days. Additionally, September's humidity level of 68% is lower than July's 79%, indicating a more comfortable feel in the early autumn month. For a detailed overview of conditions in July, visit Boone weather in July.

In comparing the weather of September to August, September experiences a notable drop in minimum temperatures, ranging from 3°C (38°F) compared to August's milder minimum of 10°C (51°F). The average temperature in September is slightly lower at 18°C (65°F), while August maintains a higher average of 20°C (69°F). Although both months have similar maximum temperatures, September has slightly less precipitation at 134 mm (5.3 in) over 13 days, compared to August's 147 mm (5.8 in) spread over 17 days. Humidity remains relatively consistent, with September at 68% and August at 66%. For further information, you can check Boone weather in August.

September's weather is characterized by relatively mild temperatures, with an average of 18°C (65°F) and highs reaching up to 28°C (83°F). In contrast, October experiences a notable drop in minimum temperatures, plummeting to -4°C (25°F), while the average temperature settles around 13°C (56°F). Both months see considerable rainfall, with October recording slightly more precipitation at 146 mm (5.7 in) over 11 days compared to September's 134 mm (5.3 in) over 13 days. Additionally, October's humidity increases to 78%, making it feel slightly more damp than September's 68%. For more specific insights, check Boone weather in October.

In September, the weather is typically much milder, with average temperatures around 18°C (65°F) and maximums reaching up to 28°C (83°F). This month experiences a fair amount of rainfall, totaling 134 mm (5.3 in) over approximately 13 days, with humidity levels at 68%. In contrast, November brings a significant drop in temperatures, with averages falling to just 6°C (43°F) and minimums dipping as low as -10°C (14°F). Although November sees less rainfall, totaling 82 mm (3.2 in) over 9 days, the humidity is notably higher at 89%. For a detailed look at November weather patterns, check out Boone weather in November.

September and December present stark contrasts in weather conditions. In September, temperatures range from a chilly 3°C (38°F) at night to a warm 28°C (83°F) during the day, contributing to an average of 18°C (65°F). The month sees approximately 134 mm (5.3 in) of rainfall over 13 days, along with a relative humidity of 68%. In contrast, December experiences much colder temperatures, with a minimum of -14°C (7°F) and an average of just 4°C (39°F). While daytime highs can reach 20°C (69°F), the colder nights significantly drop the overall feel of the month. Precipitation in December amounts to 117 mm (4.6 in) over 11 days, accompanied by higher humidity at 86%. For more detailed insights, check out Boone weather in December.

Compare Boone's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Boone

As September rolls in, Boone experiences a noticeable shift in temperature and humidity compared to the summer months. Days are still mild, but cooler nights signal the approaching fall, making for a refreshing change. With average temperatures hovering around 18°C, it's a delightful escape from the sweltering heat of summer. However, this month also brings increased precipitation, with rain show up on about half the days, adding a lush vibrancy to the landscape. The elevated humidity at 68% can make the air feel a bit heavier, distinctly marking the transition into autumn. To explore more about Boone's climate throughout the year, visit Boone Climate.