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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 25°C (76°F). However, temperatures can fluctuate significantly, with a minimum of 8°C (47°F) and a maximum reaching up to 37°C (99°F). Expect about 94 mm (3.7 in) of precipitation spread over 7 days, and enjoy an average humidity level of 64%.

September Temperature in Winchester

In September in Winchester, the average temperature is 25°C (76°F). Maximums can reach 37°C (99°F), while minimums can drop to as low as 8°C (47°F). This climate makes Winchester an excellent destination for travelers seeking warm days and cool evenings.

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 25°C (76°F), with highs reaching up to 37°C (99°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec404254607079838176635145
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 94 mm (3.7 in) over a span of 7 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 94 mm (3.7 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec78731071721859894110941355254
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 64%. With an average temperature of 25°C (76°F), this humidity feels like a warm embrace, making it a perfect time for leisurely strolls and outdoor adventures, but travelers should stay hydrated and take occasional breaks to avoid feeling sticky or overheated.

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 64%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec79%78%75%75%83%82%78%68%64%71%82%87%
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.
JanFebMarAprMayJunJulAugSepOctNovDec46710101111109753
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 Weather4°C (40°F)78 mm (3.1 inches)79%moderate
February Weather5°C (42°F)73 mm (2.9 inches)78%high
March Weather12°C (55°F)107 mm (4.2 inches)75%high
April Weather15°C (60°F)172 mm (6.8 inches)75%very high
May Weather21°C (70°F)185 mm (7.3 inches)83%very high
June Weather26°C (79°F)98 mm (3.8 inches)81%extreme
July Weather28°C (83°F)94 mm (3.7 inches)78%extreme
August Weather27°C (81°F)110 mm (4.3 inches)68%very high
September Weather25°C (76°F)94 mm (3.7 inches)64%very high
October Weather17°C (63°F)135 mm (5.3 inches)71%high
November Weather10°C (51°F)52 mm (2.0 inches)82%moderate
December Weather7°C (45°F)54 mm (2.1 inches)87%moderate

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