The highest day temperature in September 2025 was 86°F. The lowest night temperature was 38°F. The average values for day and night temperatures during September were 72.7°F и 56.7°F respectivly.

Most of the days in September are sunny but you can also expect cloudy and gloomy days.

Precipitation total in September for Eau Claire is 0.7 in.

The average wind speed in September is 7.9 mph. It makes September one of the most windless months of the year for Eau Claire.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Eau Claire in September is 8.1 hours.