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September Weather in Winchester, United States

Last updated: June 24, 2025

The average temperature in Winchester, United States for September hovers around 22°C (72°F), making it a pleasant time to visit. However, be prepared for temperature fluctuations, with minimums dipping to 7°C (44°F) and maximums soaring to 33°C (92°F). Expect 85 mm (3.3 in) of precipitation spread across about 8 days, and keep in mind that the average humidity sits at a comfortable 71%.

September Temperature in Winchester

In September in Winchester, the average temperature is 22°C (72°F). Maximums can reach 33°C (92°F), and minimums can be as low as 7°C (44°F). This pleasant range makes Winchester an ideal destination for travelers seeking a comfortable climate.

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 (72°F), with highs reaching up to 33°C (92°F) and lows dropping to around 7°C (44°F).
JanFebMarAprMayJunJulAugSepOctNovDec303246546577807671564337
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 85 mm (3.3 in) over the course of 8 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 85 mm (3.3 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec45311008921812591136851154133
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 71%. With an average temperature of 22°C (72°F), this humidity feels like the air is thick and slightly stifling, making outdoor activities require frequent breaks to stay hydrated and cool.

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 71%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%78%70%73%82%82%81%78%71%71%81%84%
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.
JanFebMarAprMayJunJulAugSepOctNovDec3569101111109643
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 Weather-1°C (31°F)45 mm (1.8 inches)76%moderate
February Weather0°C (32°F)31 mm (1.2 inches)77%moderate
March Weather8°C (46°F)100 mm (3.9 inches)70%high
April Weather12°C (54°F)88 mm (3.5 inches)73%very high
May Weather19°C (66°F)218 mm (8.6 inches)82%very high
June Weather25°C (77°F)125 mm (4.9 inches)82%extreme
July Weather26°C (80°F)91 mm (3.6 inches)81%extreme
August Weather25°C (77°F)136 mm (5.3 inches)78%very high
September Weather22°C (72°F)85 mm (3.3 inches)71%very high
October Weather13°C (56°F)115 mm (4.5 inches)71%high
November Weather6°C (44°F)41 mm (1.6 inches)81%moderate
December Weather3°C (37°F)33 mm (1.3 inches)84%moderate

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