September Weather in Eau Claire, United States

Last updated: June 24, 2025

In September, the average temperature in Eau Claire, United States is a pleasant 19°C (67°F). Expect minimum temperatures to dip to 4°C (39°F), while highs can reach a warm 34°C (94°F). During this month, precipitation is recorded at 77 mm (3.0 in) over approximately 9 days, with an average humidity of 78%.

September Temperature in Eau Claire

In September in Eau Claire, the average temperature is 19°C (67°F). The maximum can reach 34°C (94°F), while the minimum can drop as low as 4°C (39°F). This range makes it a perfect time to explore outdoor activities, but be sure to pack for both warm and cool weather.

September Weather in Eau Claire: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Eau Claire, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Eau Claire, September typically has an average temperature of 19°C (67°F), with highs reaching up to 34°C (94°F) and lows dropping to around 4°C (39°F).

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

September Precipitation in Eau Claire

In Eau Claire in September, the precipitation amount is 77 mm (3.0 in) over the course of 9 days.

September Precipitation Trends in Eau Claire

The chart displays monthly precipitation patterns in Eau Claire, 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 Eau Claire, September typically receives around 77 mm (3.0 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 Eau Claire

In Eau Claire in September humidity is 78%. With an average temperature of 19°C (67°F), this humidity feels like a warm, heavy blanket enveloping you, making traveling feel both sticky and sluggish as you navigate through the day.

September Average Humidity in Eau Claire

This chart illustrates the average monthly humidity levels in Eau Claire, 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 Eau Claire is approximately 78%, 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 Eau Claire

In Eau Claire 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 Eau Claire.

Maximum UV Index Levels in Eau Claire for September

The chart shows the monthly maximum UV Index (UVI) for Eau Claire 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 Eau Claire typically reaches 8, which falls under the very high exposure category.

Data source: Eau Claire 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 Eau Claire Compares to Other Months

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

This table compares monthly weather conditions in Eau Claire, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-2°C (28°F)	74 mm (2.9 inches)	85%	moderate
February Weather	-2°C (29°F)	74 mm (2.9 inches)	85%	moderate
March Weather	4°C (39°F)	87 mm (3.4 inches)	86%	high
April Weather	8°C (47°F)	107 mm (4.2 inches)	87%	very high
May Weather	16°C (60°F)	171 mm (6.7 inches)	81%	very high
June Weather	22°C (71°F)	136 mm (5.4 inches)	82%	very high
July Weather	24°C (75°F)	109 mm (4.3 inches)	81%	very high
August Weather	23°C (73°F)	86 mm (3.4 inches)	79%	very high
September Weather	19°C (67°F)	77 mm (3.0 inches)	78%	very high
October Weather	13°C (55°F)	140 mm (5.5 inches)	81%	high
November Weather	5°C (40°F)	70 mm (2.8 inches)	89%	moderate
December Weather	1°C (34°F)	64 mm (2.5 inches)	86%	low