September Weather in Windsor, United States

Last updated: June 24, 2025

In September, the average temperature in Windsor, United States hovers around 16°C (61°F). However, be prepared for extremes, as temperatures can drop to a chilly -2°C (28°F) or soar up to a blistering 31°C (89°F). The weather tends to be a bit wet, with 72 mm (2.8 in) of precipitation spread over 9 days, and the air feels quite humid, with an average humidity of 72%.

September Temperature in Windsor

In September in Windsor, the average temperature is 16°C (61°F), with maximums potentially reaching 31°C (89°F) and minimums dropping as low as -2°C (28°F). This diverse temperature range makes it essential to pack a variety of clothing options to stay comfortable while exploring.

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 (61°F), with highs reaching up to 31°C (89°F) and lows dropping to around -2°C (28°F).

Data source: Temperature data for Windsor generated using information from the Copernicus Climate Change Service.

September Precipitation in Windsor

In Windsor in September, the precipitation amount is 72 mm (2.8 in) over the course 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 72 mm (2.8 inches) of precipitation spread over approximately 9 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Windsor

In Windsor in September humidity is 72%. With an average temperature of 16°C (61°F), this humidity feels like a damp blanket wrapping around you, making every step feel heavier and requiring extra effort while traveling.

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.

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 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more 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 7, which falls under the high exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	-6°C (21°F)	72 mm (2.8 inches)	89%	moderate
February Weather	-4°C (24°F)	83 mm (3.3 inches)	88%	moderate
March Weather	-1°C (31°F)	71 mm (2.8 inches)	86%	high
April Weather	6°C (44°F)	117 mm (4.6 inches)	84%	very high
May Weather	13°C (56°F)	84 mm (3.3 inches)	76%	very high
June Weather	18°C (65°F)	95 mm (3.8 inches)	72%	very high
July Weather	21°C (70°F)	135 mm (5.3 inches)	66%	very high
August Weather	20°C (68°F)	93 mm (3.7 inches)	64%	very high
September Weather	16°C (61°F)	72 mm (2.8 inches)	72%	high
October Weather	10°C (50°F)	141 mm (5.5 inches)	81%	moderate
November Weather	2°C (35°F)	100 mm (3.9 inches)	87%	moderate
December Weather	-3°C (26°F)	98 mm (3.9 inches)	84%	low