Eau Claire weather in September

In September, Eau Claire sees average daytime highs of 71°F and overnight lows near 52°F, with 3.3 in of rain across 9.7 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 6th-wettest month of the year here.

Highs ease over the month, from about 75°F in the first days to 65°F by the end. The sky is clear or mostly clear about 36% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 06 min at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Eau Claire's 2nd-clearest and 8th-windiest month. For the whole year in context, see Eau Claire's year-round climate.

Daytime high
71°
4th warmest
Overnight low
52°
9th coldest
Rainfall
3.3 in
9.7 wet days
Daylight
12 h 18 min
5:51 AM – 6:10 PM
Cloud cover
54%
2nd clearest
Wind
8 mph
8th windiest
Solar energy
4.12 kWh/m²
Travel score
6.7
out of 10

Eau Claire is city in Eau Claire and Chippewa counties in Wisconsin, United States, that is the county seat of Eau Claire County.

Density
766/km²
people per km²
Founded
1856

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 75°F in the first days to 65°F by the end.

A typical September day in Eau Claire reaches about 71°F in the afternoon and slips back to 52°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 59°F and 82°F. Set against its neighbours, September runs about 8°F cooler than August and about 14°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
17657
27656
37656
47556
57556
67455
77455
87455
97354
107354
117353
127253
137253
147152
157152
167152
177051
187051
196950
206950
216850
226849
236749
246748
256748
266647
276647
286546
296546
306446

How September really feels in Eau Claire

Once humidity and wind are folded in, September averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
0
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Eau Claire weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan24° / 1.26.86.790.0
Feb29° / 12°1.15.75.310.10.0
Mar41° / 24°2.18.54.511.60.6
Apr55° / 36°3.511.52.613.23.4
May67° / 48°4.312.80.114.65.7
Jun77° / 58°4.512.1015.36.4
Jul80° / 62°3.310.60156.5
Aug78° / 60°4.010013.96.8
Sep71° / 52°3.39.7012.36.7
Oct57° / 39°2.990.510.74.0
Nov41° / 27°2.16.93.69.40.5
Dec29° / 15°1.56.96.28.70.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 36% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 47%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15842
25842
35743
45743
55842
65743
75743
85644
95644
105644
115545
125446
135446
145347
155347
165248
175248
185149
195149
205149
215149
225149
235050
245050
255149
265050
275149
285149
295149
305050

Chance of precipitation in September

Any precipitation

Eau Claire gets around 3.3 in of rain over 9.7 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 32% and peaks near 34% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
131
231
331
431
531
631
731
831
931
1031
1131
1231
1331
1431
1532
1632
1732
1832
1932
2033
2133
2233
2333
2434
2534
2634
2734
2834
2933
3033

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the dry band about 63% of days. Sticky, muggy-or-worse air turns up on roughly 6% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1412322123
2432321112
3452320102
4472319102
549221892
650221792
752221781
854211681
955211671
1056211571
1156211571
1258211461
1360211360
1460211360
1562211250
1663201250
1764201150
1866201040
1967191040
206918940
217118830
227317730
237416730
247516630
257815520
267914520
278113420
288212420
298411320
308510320

Wind in September

Winds average 8 mph in September.

Across September, daily wind ranges from about 7 mph on the calmest days to 8 mph at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (mph)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147light breeze
158light breeze
168light breeze
178light breeze
188light breeze
198light breeze
208light breeze
218light breeze
228light breeze
238light breeze
248light breeze
258light breeze
268light breeze
278light breeze
288light breeze
298light breeze
308light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 06 min at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 90 minutes over September. Sunrise moves from 5:33 AM to 6:09 AM, and sunset from 6:39 PM to 5:42 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.15:336:39
213.05:346:37
313.05:356:35
412.95:366:33
512.95:386:31
612.85:396:29
712.85:406:27
812.75:416:25
912.75:436:23
1012.65:446:21
1112.65:456:19
1212.55:466:17
1312.55:476:15
1412.45:496:13
1512.45:506:12
1612.35:516:10
1712.35:526:08
1812.25:546:06
1912.15:556:04
2012.15:566:02
2112.05:576:00
2212.05:585:58
2311.96:005:56
2411.96:015:54
2511.86:025:52
2611.86:035:50
2711.76:055:48
2811.76:065:46
2911.66:075:44
3011.66:095:42

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.12 kWh/m².

For context, solar energy here swings from a low near 1.41 kWh/m² to a high of 6.19 kWh/m² in July across the year — September's 4.12 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.8Bright
34.7Bright
44.7Bright
54.6Bright
64.6Bright
74.5Bright
84.5Bright
94.4Bright
104.4Bright
114.3Bright
124.3Bright
134.2Bright
144.1Bright
154.1Bright
164.0Bright
174.0Moderate
184.0Moderate
193.9Moderate
203.9Moderate
213.8Moderate
223.8Moderate
233.7Moderate
243.7Moderate
253.6Moderate
263.6Moderate
273.6Moderate
283.5Moderate
293.5Moderate
303.5Moderate
Planning a trip in September

Is September a good time to visit Eau Claire?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

6.7
Sightseeing
2nd-best month of the year
4.3
Beach & pool
4th-best month of the year

September is a reasonable time to visit Eau Claire for sightseeing.

What to pack for Eau Claire in September

From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In September, Eau Claire sees daytime highs around 71°F and nights near 52°F. Worth packing: rain gear. About 10 days see rain.

rain gear

UV index in Eau Claire in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Eau Claire peaks around June 16 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 12 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJun 16UV 9Jan 12UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar3Moderate
Apr5High
May7Very high
Jun9Very high
Jul7Very high
Aug7Very high
Sep6High
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Eau Claire?

Eau Claire sits at 44.8°N, 91.5°W, 787 ft above sea level, in United States. The nearest listed city is Menomonie, 21 mi away.

Topography around Eau Claire

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Eau Claire.

Within 2 miles, the terrain around Eau Claire has only modest variations in elevation — a maximum elevation change of 305 ft around an average of 850 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 472 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,099 ft.

The land around Eau Claire is covered by trees (43%) and artificial surfaces (37%) within 2 miles, trees (45%) and cropland (30%) within 10 miles, and trees (53%) and cropland (34%) within 50 miles.

2 miles
305 ft
10 miles
472 ft
50 miles
1,099 ft
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Menomonie 21 mi · Winona 53 mi · Red Wing 53 mi · River Falls 55 mi · Onalaska 65 mi · Marshfield 66 mi · Stillwater 66 mi · Hastings 66 mi

United States travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 100% of US
price level, 2025
GDP per capita
$90,027
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
5.8
per 100k, 2023
Road deaths
12.7
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Eau Claire (44.8113°, -91.4985°, elevation 787 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).