Wausau weather in September

In September, Wausau sees average daytime highs of 68°F and overnight lows near 49°F, with 3.2 in of rain across 10.1 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 73°F in the first days to 63°F by the end. The sky is clear or mostly clear about 34% 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 Wausau's 2nd-clearest and 9th-windiest month. For the whole year in context, see Wausau's year-round climate.

Daytime high
68°
4th warmest
Overnight low
49°
9th coldest
Rainfall
3.2 in
10.1 wet days
Daylight
12 h 18 min
5:44 AM – 6:02 PM
Cloud cover
57%
2nd clearest
Wind
8 mph
9th windiest
Solar energy
4.02 kWh/m²
Travel score
6.3
out of 10

Wausau is city in and county seat of Marathon County, Wisconsin, United States.

Density
753/km²
people per km²

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 73°F in the first days to 63°F by the end.

A typical September day in Wausau reaches about 68°F in the afternoon and slips back to 49°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 57°F and 79°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)
17455
27354
37354
47354
57253
67253
77253
87152
97152
107151
117051
127051
136951
146950
156950
166849
176849
186749
196748
206748
216647
226647
236547
246546
256446
266445
276345
286345
296244
306244

How September really feels in Wausau

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.

Wausau 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
Jan23° / 1.27.17.690.0
Feb28° / 10°1.15.45.110.10.0
Mar40° / 21°2.18.25.511.60.3
Apr53° / 34°3.211.33.513.23.0
May65° / 46°3.712.50.214.65.5
Jun74° / 56°4.111.8015.36.4
Jul78° / 60°3.611.4015.16.6
Aug76° / 57°3.710.5013.96.9
Sep68° / 49°3.210.1012.36.3
Oct54° / 38°3.09.60.810.73.4
Nov39° / 26°2.07.53.89.40.3
Dec28° / 14°1.67.16.88.60.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 34% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 51%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15446
25545
35545
45545
55545
65446
75347
85347
95248
105248
115149
125050
135050
144852
154852
164852
174753
184753
194753
204753
214654
224654
234555
244555
254555
264555
274555
284555
294456
304456

Chance of precipitation in September

Any precipitation

Wausau gets around 3.2 in of rain over 10.1 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 34% and peaks near 36% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
131
231
331
431
531
631
731
832
932
1032
1133
1233
1334
1434
1534
1634
1734
1834
1935
2035
2135
2235
2335
2436
2536
2636
2736
2835
2935
3035

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 69% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
150231981
251221881
353221771
455211770
557211660
658201660
759201560
861191550
961191550
1062191450
1164181350
1265181340
1366181240
1467181140
1567181140
1669171040
1770171030
187117930
197316830
207415830
217615720
227814620
237913620
248112520
258212420
268411410
278510410
28879310
29888310
30897310

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
127light breeze
138light breeze
148light 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 5:25 AM to 6:01 AM, and sunset from 6:31 PM to 5:35 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.15:256:31
213.15:266:29
313.05:286:28
412.95:296:26
512.95:306:24
612.85:316:22
712.85:336:20
812.75:346:18
912.75:356:16
1012.65:366:14
1112.65:376:12
1212.55:396:10
1312.55:406:08
1412.45:416:06
1512.45:426:04
1612.35:446:02
1712.35:456:00
1812.25:465:58
1912.15:475:56
2012.15:495:54
2112.05:505:52
2212.05:515:50
2311.95:525:48
2411.95:545:46
2511.85:555:44
2611.85:565:42
2711.75:575:40
2811.75:595:38
2911.66:005:36
3011.66:015:35

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.02 kWh/m².

For context, solar energy here swings from a low near 1.37 kWh/m² to a high of 6.08 kWh/m² in June across the year — September's 4.02 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.7Bright
24.6Bright
34.6Bright
44.6Bright
54.5Bright
64.5Bright
74.4Bright
84.4Bright
94.3Bright
104.3Bright
114.2Bright
124.2Bright
134.1Bright
144.0Bright
154.0Bright
164.0Moderate
173.9Moderate
183.9Moderate
193.8Moderate
203.8Moderate
213.7Moderate
223.7Moderate
233.6Moderate
243.6Moderate
253.6Moderate
263.5Moderate
273.5Moderate
283.5Moderate
293.4Moderate
303.4Moderate
Planning a trip in September

Is September a good time to visit Wausau?

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

6.3
Sightseeing
4th-best month of the year
3.4
Beach & pool
4th-best month of the year

September is a reasonable time to visit Wausau for sightseeing.

What to pack for Wausau in September

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

In September, Wausau sees daytime highs around 68°F and nights near 49°F. Worth packing: rain gear. About 10 days see rain.

rain gear

UV index in Wausau 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 Wausau peaks around June 17 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 11 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 17UV 9Jan 11UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar3Moderate
Apr5High
May7Very high
Jun9Very high
Jul8Very high
Aug7Very high
Sep6High
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Wausau?

Wausau sits at 45.0°N, 89.6°W, 1,204 ft above sea level, in United States. The nearest listed city is Weston, 6.2 mi away.

Topography around Wausau

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

Within 2 miles, the terrain around Wausau has only modest variations in elevation — a maximum elevation change of 338 ft around an average of 1,250 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 807 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,168 ft.

The land around Wausau is covered by trees (45%) and artificial surfaces (32%) within 2 miles, trees (59%) and cropland (22%) within 10 miles, and trees (67%) and cropland (25%) within 50 miles.

2 miles
338 ft
10 miles
807 ft
50 miles
1,168 ft
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Weston 6.2 mi · Stevens Point 30 mi · Marshfield 34 mi · Wisconsin Rapids 41 mi · Appleton 77 mi · Menasha 78 mi · Neenah 78 mi · Howard 81 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 Wausau (44.9591°, -89.6301°, elevation 1,204 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).