Eau Claire weather in September: Eau Claire, Wisconsin: normal highs, lows, rain and records for September
Eau Claire in September has a normal high of 72°F and a normal low of 49°F, a daily mean of 61°F, falling from 78°F on the 1st to 66°F by the 30th. Measurable precipitation falls on 11 days in a normal September, 3.65 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 22°C and low of 10°C, 93 mm of precipitation in September.
- NOAA stationChippewa Valley Regional Airport
- Station IDUSW00014991
- Location44.87°N 91.49°W
- Elevation885 ft (270 m)
- From the center3 miles
- Population72,331
- Jan 23° 6°
- Feb 28° 9°
- Mar 41° 21°
- Apr 57° 33°
- May 70° 45°
- Jun 79° 56°
- Jul 83° 60°
- Aug 80° 58°
- Sep 72° 49°
- Oct 58° 37°
- Nov 42° 25°
- Dec 29° 13°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Eau Claire in September?
The normal high is 72°F and the normal low 49°F, for a daily mean of 60.8°F. September is 8.3°F cooler than August and 13.3°F warmer than October. September is the 4th warmest month of the year in Eau Claire and the 4th wettest. Across the month the normal high falls 12°F, from 78°F on September 1 to 66°F on September 30. From one year to the next September's mean temperature typically moves about 3.0°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 58°F and 64°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 36%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 78°F | 55°F | 34% | 22% |
| September 8 | 75°F | 53°F | 35% | 21% |
| September 15 | 73°F | 50°F | 36% | 22% |
| September 22 | 70°F | 47°F | 36% | 22% |
| September 30 | 66°F | 43°F | 35% | 21% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 78°F | 55°F | 34% | 22% | 13 h 20 min |
| September 2 | 77°F | 54°F | 34% | 22% | 13 h 20 min |
| September 3 | 77°F | 54°F | 34% | 21% | 13 h 10 min |
| September 4 | 77°F | 54°F | 35% | 21% | 13 h 10 min |
| September 5 | 76°F | 54°F | 35% | 21% | 13 h 10 min |
| September 6 | 76°F | 53°F | 35% | 21% | 13 h |
| September 7 | 76°F | 53°F | 35% | 21% | 13 h |
| September 8 | 75°F | 53°F | 35% | 21% | 13 h |
| September 9 | 75°F | 52°F | 35% | 22% | 12 h 50 min |
| September 10 | 75°F | 52°F | 35% | 22% | 12 h 50 min |
| September 11 | 74°F | 51°F | 35% | 22% | 12 h 50 min |
| September 12 | 74°F | 51°F | 35% | 22% | 12 h 50 min |
| September 13 | 74°F | 51°F | 36% | 22% | 12 h 40 min |
| September 14 | 73°F | 50°F | 36% | 22% | 12 h 40 min |
| September 15 | 73°F | 50°F | 36% | 22% | 12 h 40 min |
| September 16 | 72°F | 49°F | 36% | 22% | 12 h 30 min |
| September 17 | 72°F | 49°F | 36% | 22% | 12 h 30 min |
| September 18 | 72°F | 48°F | 36% | 22% | 12 h 30 min |
| September 19 | 71°F | 48°F | 36% | 22% | 12 h 20 min |
| September 20 | 71°F | 48°F | 36% | 22% | 12 h 20 min |
| September 21 | 70°F | 47°F | 36% | 22% | 12 h 20 min |
| September 22 | 70°F | 47°F | 36% | 22% | 12 h 10 min |
| September 23 | 69°F | 46°F | 36% | 22% | 12 h 10 min |
| September 24 | 69°F | 46°F | 36% | 22% | 12 h 10 min |
| September 25 | 69°F | 45°F | 36% | 22% | 12 h 10 min |
| September 26 | 68°F | 45°F | 36% | 22% | 12 h |
| September 27 | 68°F | 45°F | 36% | 22% | 12 h |
| September 28 | 67°F | 44°F | 35% | 21% | 12 h |
| September 29 | 67°F | 44°F | 35% | 21% | 11 h 50 min |
| September 30 | 66°F | 43°F | 35% | 21% | 11 h 50 min |
- Normal high
- 72°FSeptember average
- Normal low
- 49°FSeptember average
- Precipitation
- 3.65 inmonth total
- Days with precipitation
- 110.01 inch or more
- Days at 90°F or more
- 1
- Nights at 32°F or colder
- 1
- Daylight
- 13 h 20 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 18
- Days at 80°F or more
- 8
- Sunshine
- 75%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014991; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Eau Claire in September?
On a given September day the chance of 0.01 inch or more is 35% on average, highest around September 20 (36%). In all, 3.65 in falls on 11 days of a normal September, 1 of them with an inch or more.
In a normal September in Eau Claire, 1 days reach 90°F and 1 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014991.
How humid and windy is Eau Claire in September?
At 3 p.m. the normal temperature is 63°F with 49% relative humidity and a dew point of 44°F; at 6 a.m. it is 47°F with 87% humidity. The wind averages 7.3 mph, most often from the southwest in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 47°F | 43°F | 87% | 5.3 mph | 53% |
| 9 a.m. | 54°F | 45°F | 72% | 8.5 mph | 55% |
| noon | 61°F | 45°F | 55% | 10.3 mph | 51% |
| 3 p.m. | 63°F | 44°F | 49% | 10.7 mph | 51% |
| 6 p.m. | 58°F | 45°F | 61% | 7.0 mph | 58% |
| 9 p.m. | 53°F | 45°F | 75% | 6.2 mph | 62% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00014991. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for September in Eau Claire?
The warmest September temperature on Eau Claire's official record (since 1893) is 101°F, on September 10, 1931; the coldest is 22°F, on September 30, 1899. The wettest September brought 10.85 in (1986).
The September mean against the 1991-2020 normal of 60.8°F: 2021 63.0°F (+2.2), 2022 62.0°F (+1.2), 2023 65.9°F (+5.1), 2024 65.9°F (+5.1), 2025 63.6°F (+2.9), 2026 64.3°F (+3.5). 6 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 63.0°F | +2.2°F | 1.85 in |
| 2022 | 62.0°F | +1.2°F | 2.30 in |
| 2023 | 65.9°F | +5.1°F | 3.44 in |
| 2024 | 65.9°F | +5.1°F | 1.81 in |
| 2025 | 63.6°F | +2.9°F | 1.24 in |
| 2026 | 64.3°F | +3.5°F | 3.29 in |
Source: records: ACIS, NWS threaded record EAUthr; recent months: ACIS, station USW00014991. Records and recent months use complete months only.
How does September in Eau Claire compare across Wisconsin?
Across the 165 places PlainClimate covers in Wisconsin, September normal highs run from 64°F in Laona to 77°F in West Allis; Eau Claire's is 72°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Eau Claire in August80°F by day, 58°F at night
- Eau Claire in October58°F by day, 37°F at night
- Eau Claire through the yearEvery month, frost dates, records and recent years
- Wisconsin in SeptemberThe statewide normal and the warmest and coolest places
- West Allis: Wisconsin's warmest Septembernormal high 77°F