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September Weather in Windsor, United States

Last updated: June 24, 2025

In September, the average temperature in Windsor, United States is a pleasant 23°C (74°F). However, temperatures can vary significantly, with lows of 10°C (50°F) and highs reaching up to 35°C (96°F). Expect some rain, as the area receives approximately 130 mm (5.1 in) over 11 days during the month. Additionally, the average humidity sits at a comfortable 78%, creating a lush and inviting atmosphere. Enjoy your time in this vibrant locale!

September Temperature in Windsor

In September in Windsor, the average temperature is 23°C (74°F). Maximum temperatures can reach up to 35°C (96°F), while minimum temperatures can drop as low as 10°C (50°F). This makes Windsor a pleasant destination for travelers seeking warm days and cool nights.

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

The chart illustrates September temperature patterns in Windsor, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Windsor, September typically has an average temperature of 23°C (74°F), with highs reaching up to 35°C (96°F) and lows dropping to around 10°C (50°F).
JanFebMarAprMayJunJulAugSepOctNovDec424751616976807974655246
Data source: Temperature data for Windsor 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 Windsor

In Windsor in September, the total precipitation amount is 130 mm (5.1 in) occurring over 11 days.

September Precipitation Trends in Windsor

The chart displays monthly precipitation patterns in Windsor, 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 Windsor, September typically receives around 130 mm (5.1 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec9210587102118114137169130827688
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Windsor

In Windsor in September humidity is 78%. With an average temperature of 23°C (74°F), this humidity feels like a warm, enveloping embrace, making travel somewhat stifling and prompting frequent breaks to hydrate and seek shade.

September Average Humidity in Windsor

This chart illustrates the average monthly humidity levels in Windsor, 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 Windsor is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%83%82%81%80%82%81%81%78%80%84%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Windsor

In Windsor 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 Windsor.

Maximum UV Index Levels in Windsor for September

The chart shows the monthly maximum UV Index (UVI) for Windsor 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 Windsor typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec4689111011109853
Data source: Windsor 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 Windsor Compares to Other Months

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

This table compares monthly weather conditions in Windsor, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (42°F)92 mm (3.6 inches)84%moderate
February Weather8°C (47°F)105 mm (4.1 inches)83%high
March Weather11°C (51°F)87 mm (3.4 inches)82%very high
April Weather16°C (61°F)102 mm (4.0 inches)81%very high
May Weather20°C (69°F)118 mm (4.7 inches)80%extreme
June Weather24°C (76°F)114 mm (4.5 inches)82%very high
July Weather27°C (80°F)136 mm (5.4 inches)81%extreme
August Weather26°C (79°F)169 mm (6.7 inches)81%very high
September Weather23°C (74°F)130 mm (5.1 inches)78%very high
October Weather18°C (65°F)82 mm (3.2 inches)80%very high
November Weather11°C (52°F)76 mm (3.0 inches)84%moderate
December Weather8°C (47°F)88 mm (3.5 inches)84%moderate

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