Winona weather in September

In September, Winona sees average daytime highs of 71°F and overnight lows near 52°F, with 3.3 in of rain across 9.3 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 76°F in the first days to 66°F by the end. The sky is clear or mostly clear about 39% 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 Winona's 1st-clearest and 9th-windiest month. For the whole year in context, see Winona's year-round climate.

Daytime high
71°
4th warmest
Overnight low
52°
9th coldest
Rainfall
3.3 in
9.3 wet days
Daylight
12 h 18 min
5:52 AM – 6:10 PM
Cloud cover
52%
1st clearest
Wind
8 mph
9th windiest
Solar energy
4.23 kWh/m²
Travel score
6.8
out of 10

Winona is city and the county seat of Winona County, Minnesota, United States.

Density
433/km²
people per km²
Founded
1805

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 76°F in the first days to 66°F by the end.

A typical September day in Winona 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 60°F and 82°F. Set against its neighbours, September runs about 7°F cooler than August and about 14°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
17658
27658
37657
47557
57556
67556
77456
87455
97455
107355
117354
127354
137254
147253
157153
167152
177152
187052
197051
206951
216950
226850
236849
246749
256749
266748
276648
286647
296547
306546

How September really feels in Winona

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.

Winona 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° / 10°1.26.76.39.10.0
Feb29° / 13°1.26.15.210.20.0
Mar42° / 25°2.394.311.60.6
Apr56° / 37°3.711.6213.23.5
May67° / 49°4.513.10.114.55.7
Jun76° / 59°5.112.4015.26.3
Jul80° / 63°4.110.60156.6
Aug78° / 60°3.79.3013.86.9
Sep71° / 52°3.39.3012.36.8
Oct57° / 40°2.98.90.510.84.2
Nov42° / 28°2.06.93.39.40.6
Dec29° / 16°1.57.368.80.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 39% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 45%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16139
26139
36238
46238
56139
66238
76139
86040
96040
105941
115842
125743
135743
145545
155446
165347
175347
185248
195149
205149
215149
225149
235149
245149
255149
265248
275149
285149
295248
305248

Chance of precipitation in September

Any precipitation

Winona gets around 3.3 in of rain over 9.3 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 31% and peaks near 33% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
128
228
328
428
529
629
729
830
930
1030
1131
1231
1332
1432
1532
1633
1733
1833
1933
2033
2133
2233
2333
2433
2533
2633
2733
2833
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 60% 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 (%)
1352521153
2372421143
3402420133
4422420123
5442419112
6462319102
7472318102
849221892
951211891
1053211781
1153211781
1255201681
1356201671
1458201570
1560191560
1661191460
1762191360
1864181350
1965181250
2067171150
2169171040
2270161040
237215940
247415830
257514830
267713730
277913620
288012620
298211520
308310520

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
137light 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 5:34 AM to 6:09 AM, and sunset from 6:38 PM to 5:43 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.15:346:38
213.05:356:36
313.05:376:35
412.95:386:33
512.95:396:31
612.85:406:29
712.85:416:27
812.75:426:25
912.75:446:23
1012.65:456:21
1112.65:466:19
1212.55:476:18
1312.55:486:16
1412.45:506:14
1512.45:516:12
1612.35:526:10
1712.25:536:08
1812.25:546:06
1912.15:556:04
2012.15:576:02
2112.05:586:00
2212.05:595:58
2311.96:005:56
2411.96:015:54
2511.86:035:53
2611.86:045:51
2711.76:055:49
2811.76:065:47
2911.66:085:45
3011.66:095:43

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.23 kWh/m².

For context, solar energy here swings from a low near 1.49 kWh/m² to a high of 6.26 kWh/m² in July across the year — September's 4.23 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
34.8Bright
44.8Bright
54.8Bright
64.7Bright
74.7Bright
84.6Bright
94.5Bright
104.5Bright
114.4Bright
124.4Bright
134.3Bright
144.3Bright
154.2Bright
164.2Bright
174.1Bright
184.0Bright
194.0Bright
204.0Moderate
213.9Moderate
223.9Moderate
233.8Moderate
243.8Moderate
253.8Moderate
263.7Moderate
273.7Moderate
283.6Moderate
293.6Moderate
303.6Moderate
Planning a trip in September

Is September a good time to visit Winona?

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

6.8
Sightseeing
2nd-best month of the year
4.4
Beach & pool
4th-best month of the year

September is a reasonable time to visit Winona for sightseeing.

What to pack for Winona in September

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

In September, Winona sees daytime highs around 71°F and nights near 52°F. Worth packing: rain gear. About 9 days see rain.

rain gear

UV index in Winona 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 Winona peaks around June 14 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 highVery highHighModerateLowJun 14UV 9Jan 12UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar3Moderate
Apr5High
May8Very high
Jun9Very high
Jul7High
Aug7Very high
Sep6High
Oct3Moderate
Nov2Low
Dec2Low
Location & terrain

Where is Winona?

Winona sits at 44.0°N, 91.6°W, 666 ft above sea level, in United States. The nearest listed city is Onalaska, 23 mi away.

Topography around Winona

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

Within 2 miles, the terrain around Winona has only modest variations in elevation — a maximum elevation change of 610 ft around an average of 722 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 725 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 833 ft.

The land around Winona is covered by trees (42%) and artificial surfaces (26%) within 2 miles, trees (52%) and cropland (27%) within 10 miles, and trees (46%) and cropland (42%) within 50 miles.

2 miles
610 ft
10 miles
725 ft
50 miles
833 ft
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Onalaska 23 mi · North La Crosse 24 mi · La Crosse 26 mi · Rochester 41 mi · Eau Claire 53 mi · Red Wing 57 mi · Menomonie 58 mi · Austin 71 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 Winona (44.05°, -91.6393°, elevation 666 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).