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September Weather in Windsor, United States

Last updated: June 24, 2025

In September, the average temperature in Windsor, United States hovers around 16°C (62°F). While the mercury can dip to a chilly 0°C (32°F), it can also rise to a warm 30°C (87°F). Expect about 127 mm (5.0 in) of precipitation spread over 9 days, accompanied by an average humidity of 72%. Prepare accordingly for a blend of mild temperatures and occasional rain!

September Temperature in Windsor

In September, in Windsor, the average temperature is 16°C (62°F). Maximums can reach 30°C (87°F), while minimums can dip as low as 0°C (32°F). Be prepared for a wide range of temperatures when traveling during this time.

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 16°C (62°F), with highs reaching up to 30°C (87°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec242732445665706862513728
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 precipitation amount is 127 mm (5.0 in) over a span of 9 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 127 mm (5.0 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec8911193158123108193144127179113132
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 72%. With an average temperature of 16°C (62°F), this humidity feels like a warm blanket wrapped around you, making it slightly uncomfortable for traveling as you might find yourself sweating more than usual, especially during outdoor activities.

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 72%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%88%86%84%76%72%67%64%72%81%87%85%
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 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to 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 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35681010998642
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 Weather-5°C (24°F)89 mm (3.5 inches)89%moderate
February Weather-3°C (27°F)111 mm (4.4 inches)88%moderate
March Weather0°C (33°F)93 mm (3.7 inches)86%high
April Weather7°C (44°F)158 mm (6.2 inches)84%very high
May Weather13°C (56°F)123 mm (4.8 inches)76%very high
June Weather18°C (65°F)108 mm (4.3 inches)72%very high
July Weather21°C (71°F)193 mm (7.6 inches)66%very high
August Weather20°C (69°F)144 mm (5.7 inches)64%very high
September Weather16°C (62°F)127 mm (5.0 inches)72%very high
October Weather11°C (51°F)179 mm (7.0 inches)81%high
November Weather3°C (37°F)113 mm (4.4 inches)87%moderate
December Weather-2°C (28°F)132 mm (5.2 inches)84%low

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