September Weather in Winchester, United States

Last updated: February 24, 2025

September in Winchester, United States showcases a dynamic interplay of temperatures and weather conditions. Residents can expect maximum highs reaching up to 35°C (95°F), with an inviting average temperature of 21°C (69°F), while cool nights dip down to 3°C (38°F). This month witnesses an average of 115 mm (4.5 in) of precipitation over 9 days, contributing to the lush landscapes characteristic of the area. With humidity levels hovering around 68%, September offers a rich sensory experience, blending warm days with refreshing rainfall and comfortable evenings.

September Temperature in Winchester

In September, Winchester experiences a delightful transition, with temperatures reflecting the gradual shift from summer to fall. The minimum temperature hovers around 3°C (38°F), offering a cool start to the month, while the average rises to a pleasant 21°C (69°F), perfect for outdoor activities. The maximum temperature can soar to a warm 35°C (95°F), reminiscent of summer's lingering warmth. This month showcases a perfect blend of comfortable days and crisp evenings, making it an ideal time to enjoy the beauty of the changing leaves and the refreshing vibe of the onset of autumn.

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

The chart illustrates September temperature patterns in Winchester, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec343844546472787569594438
Data source: Temperature data for Winchester 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 Winchester

September in Winchester marks a notable transition in the weather, bringing an average precipitation of 115 mm (4.5 in) over just 9 days of rainfall. This month typically sees a slight uptick in rain after the summer months, as the region begins its shift towards autumn. Compared to the previous months, where rainfall ranged between 106 mm and 142 mm, September strikes a balance, providing consistent moisture without overwhelming downpours. This pattern indicates that while summer’s heat starts to wane, Winchester welcomes a refreshing dose of rain, setting the stage for vibrant fall foliage and cooler temperatures.

September Precipitation Trends in Winchester

The chart displays monthly precipitation patterns in Winchester, 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.
JanFebMarAprMayJunJulAugSepOctNovDec6193831021421111081061151067691
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Winchester

In September, humidity in Winchester begins to shift as summer wanes, averaging around 68%. This marks a notable drop from the sticky highs of 70% in July and 59% in August, signaling the transition into the cooler months. The trend reveals a gradual decrease from the 86% humidity typical of the winter months, suggesting that while September retains a hint of summer’s warmth, it also paves the way for the crisper air of fall. As the days shorten and temperatures cool, residents can expect a more comfortable atmosphere, setting the stage for the increased humidity that will return in the following months, particularly in October and November.

September Average Humidity in Winchester

This chart illustrates the average monthly humidity levels in Winchester, 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%84%78%79%70%59%68%80%87%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Winchester

As September rolls in, Winchester experiences a significant UV Index of 8, categorizing exposure as very high with a burn time of just 15 minutes. This marks a slight decrease from the peak summer months, which featured a consistent UV Index of 10, but it remains a strong reminder that sun safety is crucial. The trend clearly shows a progression from lower indices in the earlier months of the year, culminating in the high risks of summer, before gradually easing into the safer rays of autumn. As days grow shorter and temperatures start to cool, remember that UV exposure doesn't diminish immediately, so staying vigilant is key. For detailed UV trends, check out Winchester UV Index.

Maximum UV Index Levels in Winchester for September

The chart shows the monthly maximum UV Index (UVI) for Winchester 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.
JanFebMarAprMayJunJulAugSepOctNovDec35710101010108753
Data source: Winchester 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 Winchester

September in Winchester, United States, offers a delightful continuation of summer warmth, boasting 273 hours of sunshine. This marks a gentle decline from the peak solar abundance of 356 hours in July, with August also shining brightly at 314 hours. The month transitions the city from the vibrant summer days into the crispness of fall, showcasing a notable abundance of sunlight compared to the earlier months of the year. In the broader pattern, September stands out as the last major sunlight surge before the hours gradually taper off into the cooler months of October and November. As daylight begins to wane, Winchester still basks in the remnants of summer, making it a picturesque time to enjoy outdoor activities amidst the changing leaves.

Monthly Sunshine Duration in Winchester: September Highlighted

The September sunshine duration represents the total number of hours Winchester 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.
JanFebMarAprMayJunJulAugSepOctNovDec146h177h256h253h270h315h356h314h273h243h220h189h
Data source: Winchester September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Winchester During September

In September, Winchester, United States, experiences a notable increase in sunny weather, with a 53% chance of sunshine, making it one of the sunniest months of the year. After a summer characterized by fluctuating sun probabilities—peaking at 50% in July—September becomes a refreshing transition into autumn, showing a slight climb in sunlight after the typically overcast months of late summer. This trend points to an optimistic outlook for outdoor activities, as September stands out with its relatively high likelihood of sunny days compared to the lower percentages seen in the early months of the year. As the seasons shift, residents can look forward to enjoying pleasant weather that sets the stage for the beautiful hues of fall.

Percentage of Sunny Days in September in Winchester

The chart illustrates the percentage of sunny days in Winchester 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 Winchester experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec39%28%52%46%41%38%50%38%54%38%54%36%
Data source: Winchester September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Winchester in September

As summer fades into autumn, September in Winchester, United States, brings a slight decline in daylight to 12 hours. This transition reflects a gradual shift from the longer days of June, July, and August, which each basked in 14 hours of sunlight. The month marks a pivotal moment where the days start to shorten, hinting at the cooler months ahead. Following the vibrant warmth of summer, September offers a perfect balance before daylight dips further in October, settling at 11 hours. This gentle tapering of sunlight invites both reflection and preparation for the cozy evenings of fall.

Average Daylight Hours in Winchester for September

The chart illustrates the variation in daylight duration in Winchester throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 45m10h 43m11h 58m13h 15m14h 19m14h 51m14h 34m13h 37m12h 23m11h 7m10h9h 26m
Data source: Winchester daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Winchester

As September rolls into Winchester, the average wind speed gently rises to 2.5 m/s (6 mph), marking a subtle transition from the summer's calm breezes. This slight uptick follows a trend observed since the summer months, which experienced notably lower wind speeds, peaking at 1.8 m/s (4 mph) in August. Interestingly, September mirrors the wind patterns of October and November, suggesting a consistent breezy demeanor as autumn approaches. While generally mild, these winds serve as a reminder of the seasonal shift, providing a refreshing backdrop to the vibrant fall foliage that begins to flourish in the region.

Average September Wind Speed in Winchester

The chart displays monthly wind speed patterns in Winchester, 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.
JanFebMarAprMayJunJulAugSepOctNovDec2.92.93.13.22.62.32.21.82.5 m/s2.52.72.7
Data source: Winchester September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Winchester Compares to Other Months

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

September and January present strikingly different weather patterns. September boasts a warm average temperature of 21°C (69°F), with highs reaching up to 35°C (95°F) and a relatively moderate humidity of 68%. In contrast, January experiences a chillier average of just 1°C (34°F), with minimum temperatures plummeting to -21°C (-5°F), and significantly higher humidity at 86%. Additionally, September receives more precipitation, totaling 115 mm (4.5 in) over about 9 days, while January experiences less rainfall at 61 mm (2.4 in) across 7 days. For more detailed insights, you can refer to Winchester weather in January.

September weather in Winchester typically offers a wide range of temperatures, with a minimum of 3°C (38°F) and a maximum reaching up to 35°C (95°F). The average temperature is a comfortable 21°C (69°F), accompanied by 115 mm (4.5 in) of precipitation over about 9 days. The humidity stands at 68%, creating warm and sometimes sticky conditions.

In contrast, February presents a starkly different climate, with a much cooler average temperature of 4°C (39°F) and nighttime lows plummeting to -17°C (2°F). The maximum temperature is more moderate at 28°C (82°F) but is paired with 93 mm (3.7 in) of precipitation spread across 11 days. February also tends to be more humid at 86%, contributing to a chilly and damp atmosphere. For more detailed insights, check out Winchester weather in February.

September and March present distinctly different weather patterns. In September, temperatures range from a mild minimum of 3°C (38°F) to an average high of 21°C (69°F), peaking at a warm 35°C (95°F). The month also sees a fair amount of rainfall, totaling 115 mm (4.5 in) over about 9 days, with humidity at 68%. In contrast, March experiences a much colder climate, with temperatures dipping to a minimum of -14°C (7°F) and averaging around 7°C (44°F), while the maximum can reach 26°C (78°F). This month has slightly less precipitation, at 83 mm (3.2 in) spread over 10 days, but features higher humidity at 86%. For a detailed look at March's weather conditions, visit Winchester weather in March.

September and April present distinct weather profiles that highlight the transition between seasons. In September, temperatures typically range from a minimum of 3°C (38°F) to a maximum of 35°C (95°F), with an average of 21°C (69°F). This month sees around 115 mm (4.5 in) of precipitation over about 9 days, and humidity levels are relatively moderate at 68%. In contrast, April experiences cooler temperatures, with a minimum of -3°C (26°F) and a maximum of 31°C (88°F), averaging only 12°C (54°F). Although April has slightly less precipitation at 102 mm (4.0 in) over 13 days, it boasts a higher humidity level of 84%. For more detailed weather insights specific to April, check this link: Winchester weather in April.

In comparing the weather of September and May, September tends to be warmer with average temperatures hovering around 21°C (69°F) and reaching highs of 35°C (95°F), while May presents slightly cooler conditions, averaging 18°C (64°F) with maximum temperatures of 32°C (90°F). However, May experiences more precipitation, averaging 142 mm (5.6 in) over 14 days, compared to September’s 115 mm (4.5 in) over 9 days. Additionally, humidity levels are higher in May at 78%, compared to September's 68%. For a detailed look into May's weather specifics, visit Winchester weather in May.

In comparing the weather of September and June, September tends to feature a broader temperature range with nighttime lows dropping to 3°C (38°F) and daytime highs reaching up to 35°C (95°F), whereas June experiences milder minimum temperatures at 9°C (48°F) and slightly cooler maximums of 34°C (94°F). Precipitation levels are fairly similar, with September receiving 115 mm (4.5 in) over approximately 9 days, compared to June's 111 mm (4.4 in) spread over 13 days. Additionally, humidity is generally higher in June at 79%, compared to September's 68%. To explore more about June weather specifically, you can visit Winchester weather in June.

When comparing the weather in September and July, notable differences emerge. September features a wider temperature range, with minimums dipping to 3°C (38°F) and maximums reaching up to 35°C (95°F), creating an average of 21°C (69°F). In contrast, July enjoys consistently warmer conditions, with minimum temperatures around 13°C (56°F) and maximums peaking at 37°C (99°F), resulting in an average of 26°C (78°F). Precipitation levels are relatively similar, with September receiving 115 mm (4.5 in) over 9 days and July slightly less at 108 mm (4.2 in) over 12 days. Humidity remains comparable, with September at 68% and July slightly higher at 70%. For more specific insights on July's climate, you can check Winchester weather in July.

September weather showcases a notable transition from the warmer and more humid conditions of August. While September's average temperature is slightly lower at 21°C (69°F) compared to August's 24°C (75°F), it features a more significant range, with minimum temperatures dropping to 3°C (38°F) and maximums reaching up to 35°C (95°F). Additionally, September sees increased precipitation with 115 mm (4.5 in) over 9 days, in contrast to August's 106 mm (4.2 in) across 14 days, indicating slightly more concentrated rainfall. The humidity also rises in September to 68%, compared to August’s 59%, making the air feel a bit heavier. For a deeper dive into specific August conditions, you can check out Winchester weather in August.

September and October showcase a notable transition in weather patterns. September enjoys warmer temperatures, with average highs reaching 35°C (95°F), while October cools down with an average of 15°C (59°F) and even dipping to a minimum of -1°C (31°F). Precipitation levels are relatively similar, with September experiencing 115 mm (4.5 in) over 9 days compared to October's 106 mm (4.2 in) over 10 days. Additionally, humidity rises in October to 80%, compared to September's 68%. This shift marks the onset of autumn's chill, making October a time for bundling up and enjoying the changing seasons. For more detailed information, you can check Winchester weather in October.

September and November present starkly contrasting weather patterns. September enjoys milder temperatures, with averages around 21°C (69°F) and highs peaking at 35°C (95°F), making it notably warmer. However, it also sees considerable rainfall, with about 115 mm (4.5 inches) over 9 days. In contrast, November experiences much cooler temperatures, with an average of only 7°C (45°F) and minimums dipping to -6°C (21°F). Despite being cooler, November has a higher humidity level at 86% and less precipitation, totaling 76 mm (3.0 inches) over 7 days. For more detailed insights, check out Winchester weather in November.

September and December showcase a striking contrast in weather patterns. September typically enjoys milder temperatures, ranging from a minimum of 3°C (38°F) to a maximum of 35°C (95°F), with an average temperature of 21°C (69°F). This month also sees higher humidity at 68% and more precipitation, totaling 115 mm (4.5 inches) over 9 days. In contrast, December brings much colder conditions, with temperatures dipping as low as -13°C (9°F) and maxing out at 21°C (70°F), producing an average temperature of just 3°C (38°F). While precipitation decreases slightly to 91 mm (3.6 inches) over 8 days, the humidity rises to a notable 85%. For more detailed insights, check Winchester weather in December.

Compare Winchester's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Winchester

As September rolls in, Winchester's weather begins to transition from the heat of summer toward the cooler embrace of autumn. With pleasant average temperatures around 21°C (69°F), the month offers a welcome respite from the peak summer heat, which can reach maximums of 35°C (95°F). While you might still experience a few warm days, the cooler nights, dipping to a refreshing 3°C (38°F), signal the change of seasons. This month also brings increased moisture, with about 115 mm of precipitation over 9 days, creating a lush and vibrant landscape. With humidity levels around 68%, there's a slight stickiness in the air, but overall, September presents a more comfortable and inviting climate compared to the sweltering summer months. For more insights into the region's weather patterns, explore the full details available at Winchester Climate.