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September Weather in Winchester, United States

Last updated: June 24, 2025

In September, the average temperature in Winchester, United States is a pleasant 22°C (71°F). Visitors can expect a range, with minimums dipping to a cool 8°C (46°F) and maximums reaching a toasty 36°C (97°F). During the month, 121 mm (4.8 in) of precipitation typically falls over about 9 days, and the average humidity hovers around 67%, providing a refreshing backdrop for exploration.

September Temperature in Winchester

In September in Winchester, the average temperature is 22°C (71°F), with maximums reaching 36°C (97°F) and minimums dropping as low as 8°C (46°F). This diverse range of temperatures makes it an ideal time for travelers to enjoy a variety of outdoor activities while packing for both warm and cooler conditions.

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. In Winchester, September typically has an average temperature of 22°C (71°F), with highs reaching up to 36°C (97°F) and lows dropping to around 8°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec364148556773777671604541
Data source: Temperature data for Winchester 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 Winchester

In Winchester in September, the precipitation amount is 121 mm (4.8 in) over the course of 9 days.

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. In Winchester, September typically receives around 121 mm (4.8 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec99142131138118170969912111184129
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Winchester

In Winchester in September, humidity is 67%. With an average temperature of 22°C (71°F), this humidity feels like a warm embrace, making outdoor activities enjoyable yet slightly uncomfortable, as the air hangs thick, reminding travelers to stay hydrated and seek shade during the midday sun.

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, helping you understand how conditions vary by season. In September, average humidity in Winchester is approximately 67%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%87%84%84%83%79%66%67%76%89%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Winchester

In Winchester in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Winchester.

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. In September, the maximum UV index in Winchester typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101110109753
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.

How September Weather in Winchester Compares to Other Months

Weather in Winchester varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Winchester, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Winchester, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (36°F)99 mm (3.9 inches)88%moderate
February Weather5°C (41°F)142 mm (5.6 inches)88%moderate
March Weather9°C (48°F)131 mm (5.1 inches)87%high
April Weather13°C (56°F)138 mm (5.4 inches)84%very high
May Weather19°C (67°F)118 mm (4.6 inches)84%very high
June Weather23°C (73°F)170 mm (6.7 inches)83%extreme
July Weather25°C (78°F)96 mm (3.8 inches)79%very high
August Weather24°C (76°F)99 mm (3.9 inches)66%very high
September Weather22°C (71°F)121 mm (4.8 inches)67%very high
October Weather16°C (60°F)111 mm (4.4 inches)76%high
November Weather7°C (45°F)84 mm (3.3 inches)89%moderate
December Weather5°C (41°F)129 mm (5.1 inches)88%moderate

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