Appleton weather in September

In September, Appleton sees average daytime highs of 70°F and overnight lows near 53°F, with 2.8 in of rain across 9 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 35% 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 Appleton's 2nd-clearest and 9th-windiest month. For the whole year in context, see Appleton's year-round climate.

Daytime high
70°
4th warmest
Overnight low
53°
9th coldest
Rainfall
2.8 in
9 wet days
Daylight
12 h 18 min
5:39 AM – 5:57 PM
Cloud cover
55%
2nd clearest
Wind
9 mph
9th windiest
Solar energy
4.11 kWh/m²
Travel score
6.7
out of 10

Appleton is city in and county seat of Outagamie County, Wisconsin, United States.

Density
1,146/km²
people per km²
Founded
1848

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 Appleton reaches about 70°F in the afternoon and slips back to 53°F overnight — a 17°F spread between the day's warmth and the night's chill. On most days the high lands between 60°F and 81°F. Set against its neighbours, September runs about 8°F cooler than August and about 13°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
17658
27558
37558
47557
57457
67457
77456
87356
97356
107355
117255
127255
137254
147154
157153
167153
177053
187052
196952
206951
216851
226851
236750
246750
256749
266649
276648
286548
296548
306447

How September really feels in Appleton

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.

Appleton 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
Jan25° / 12°1.57.86.89.10.0
Feb28° / 14°1.36.25.410.20.0
Mar40° / 24°2.38.44.511.60.4
Apr54° / 36°3.211.12.713.23.0
May66° / 48°3.310.8014.55.8
Jun76° / 59°3.510.4015.36.7
Jul80° / 63°3.410.10156.6
Aug78° / 61°3.39.9013.86.9
Sep70° / 53°2.89012.36.7
Oct57° / 42°2.89.50.210.84.1
Nov43° / 30°2.28.22.29.40.7
Dec31° / 19°1.87.25.38.70.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 35% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 48%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15842
25842
35743
45743
55743
65743
75644
85545
95446
105347
115248
125248
135149
145050
155050
164951
174951
184951
194951
204951
214951
224951
234951
244951
254951
264951
274852
284852
294852
304951

Chance of precipitation in September

Any precipitation

Appleton gets around 2.8 in of rain over 9 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 30% and peaks near 32% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
128
228
328
428
528
628
728
828
929
1029
1129
1230
1330
1430
1531
1631
1731
1831
1931
2031
2131
2231
2332
2432
2532
2632
2732
2832
2932
3032

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 59% of days. Sticky, muggy-or-worse air turns up on roughly 8% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1362324162
2382223151
3402223141
4422222141
5432122131
6452121121
7472121111
8482020111
9492020101
10502019101
1152201891
1254201790
1355201780
1456201680
1558201570
1659201470
1760201460
1862191360
1963191260
2066181150
2167181050
2269171040
237116940
247315840
257614730
267713730
277912630
288011630
298211520
308310520

Wind in September

Winds average 9 mph in September.

Across September, daily wind ranges from about 8 mph on the calmest days to 9 mph at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (mph)Feels
18light breeze
28light breeze
38light breeze
48light breeze
58light breeze
68light breeze
78light breeze
88light breeze
98light breeze
108light breeze
118light breeze
128light breeze
138light breeze
149light breeze
159light breeze
169light breeze
179light breeze
189light breeze
199light breeze
209light breeze
219light breeze
229light breeze
239light breeze
249light breeze
259light breeze
269light breeze
279light breeze
289light breeze
299light breeze
309light 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 5:21 AM to 5:56 AM, and sunset from 6:26 PM to 5:30 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.15:216:26
213.05:226:24
313.05:236:22
412.95:256:20
512.95:266:18
612.85:276:16
712.85:286:14
812.75:296:12
912.75:316:11
1012.65:326:09
1112.65:336:07
1212.55:346:05
1312.55:356:03
1412.45:376:01
1512.45:385:59
1612.35:395:57
1712.25:405:55
1812.25:415:53
1912.15:435:51
2012.15:445:49
2112.05:455:47
2212.05:465:45
2311.95:475:43
2411.95:495:42
2511.85:505:40
2611.85:515:38
2711.75:525:36
2811.75:535:34
2911.65:555:32
3011.65:565:30

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.11 kWh/m².

For context, solar energy here swings from a low near 1.5 kWh/m² to a high of 6.2 kWh/m² in June across the year — September's 4.11 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.7Bright
24.7Bright
34.7Bright
44.6Bright
54.6Bright
64.5Bright
74.5Bright
84.4Bright
94.4Bright
104.3Bright
114.3Bright
124.2Bright
134.2Bright
144.1Bright
154.1Bright
164.0Bright
174.0Moderate
184.0Moderate
193.9Moderate
203.9Moderate
213.8Moderate
223.8Moderate
233.8Moderate
243.7Moderate
253.7Moderate
263.6Moderate
273.6Moderate
283.5Moderate
293.5Moderate
303.5Moderate
Planning a trip in September

Is September a good time to visit Appleton?

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 Appleton for sightseeing.

What to pack for Appleton in September

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

In September, Appleton sees daytime highs around 70°F and nights near 53°F. Worth packing: rain gear. About 9 days see rain.

rain gear

Sea temperature near Appleton in September

The nearest coast averages about 64°F in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 37 mi away) is warmest in August at about 69°F and coldest in March near 34°F.

It's comfortable for a long swim from Aug 9 to Aug 23 — about 0.5 months when the water holds above 68°F.

30°40°50°60°70°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarm
Sea temperature (°F)Comfort
Jan37Bracing
Feb35Bracing
Mar34Bracing
Apr37Bracing
May43Bracing
Jun52Bracing
Jul65Cool
Aug69Refreshing
Sep64Cool
Oct55Bracing
Nov46Bracing
Dec39Bracing

UV index in Appleton in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Appleton peaks around June 18 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJun 18UV 9Dec 20UV 1
UV index (midday)Level
Jan2Low
Feb2Moderate
Mar4Moderate
Apr5High
May8Very high
Jun9Very high
Jul8Very high
Aug7High
Sep5High
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Appleton?

Appleton sits at 44.3°N, 88.4°W, 794 ft above sea level, in United States. The nearest listed city is Menasha, 4.3 mi away.

Topography around Appleton

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

Within 2 miles, the terrain around Appleton has only modest variations in elevation — a maximum elevation change of 174 ft around an average of 794 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 492 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 778 ft.

The land around Appleton is covered by artificial surfaces (51%) and trees (36%) within 2 miles, cropland (30%), trees (21%) and grassland (20%) within 10 miles, and cropland (40%) and trees (33%) within 50 miles.

2 miles
174 ft
10 miles
492 ft
50 miles
778 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Menasha 4.3 mi · Neenah 5.6 mi · Kaukauna 7.5 mi · Oshkosh 17 mi · De Pere 22 mi · Ashwaubenon 23 mi · Howard 25 mi · Green Bay 27 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 Appleton (44.2619°, -88.4154°, elevation 794 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).