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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 19°C (66°F). However, be prepared for a range of temperatures, as lows can dip to -1°C (31°F) while the highs can soar up to 37°C (99°F). Expect an overall precipitation of 26 mm (1.0 in) during approximately 4 days, with an average humidity level of about 63%. Stay prepared for the variability!

September Temperature in Windsor

In September in Windsor, the average temperature is 19°C (66°F). Maximum temperatures can reach 37°C (99°F), while minimums can drop to as low as -1°C (31°F). Be prepared for a wide range of weather conditions if you're 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 19°C (66°F), with highs reaching up to 37°C (99°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec302940475568747265484033
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 26 mm (1.0 in) over the course of 4 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 26 mm (1.0 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec1723535311640303726362116
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 63%. With an average temperature of 19°C (66°F), this humidity feels like a warm embrace, making it pleasantly comfortable for exploring the area's sights while infusing the air with a refreshing vitality that's ideal for travel.

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 63%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%86%75%67%67%68%62%63%63%72%80%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 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.
JanFebMarAprMayJunJulAugSepOctNovDec46811111212119643
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-1°C (30°F)17 mm (0.7 inches)84%moderate
February Weather-2°C (29°F)23 mm (0.9 inches)85%high
March Weather4°C (40°F)53 mm (2.1 inches)75%very high
April Weather8°C (47°F)53 mm (2.1 inches)67%extreme
May Weather13°C (56°F)116 mm (4.6 inches)67%extreme
June Weather20°C (68°F)40 mm (1.6 inches)68%extreme
July Weather23°C (74°F)30 mm (1.2 inches)62%extreme
August Weather22°C (72°F)37 mm (1.5 inches)63%extreme
September Weather19°C (66°F)26 mm (1.0 inches)63%very high
October Weather9°C (49°F)36 mm (1.4 inches)72%high
November Weather4°C (40°F)21 mm (0.8 inches)79%moderate
December Weather1°C (33°F)16 mm (0.6 inches)85%moderate

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