River Falls weather in September

In September, River Falls sees average daytime highs of 71°F and overnight lows near 53°F, with 3.4 in of rain across 9.6 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 5th-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 38% 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 River Falls's 2nd-clearest and 7th-windiest month. For the whole year in context, see River Falls's year-round climate.

Daytime high
71°
4th warmest
Overnight low
53°
9th coldest
Rainfall
3.4 in
9.6 wet days
Daylight
12 h 18 min
5:56 AM – 6:14 PM
Cloud cover
52%
2nd clearest
Wind
8 mph
7th windiest
Solar energy
4.18 kWh/m²
Travel score
6.7
out of 10

River Falls is city in Pierce and St. Croix counties in Wisconsin, United States.

Density
875/km²
people per km²
Founded
1885

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 River Falls reaches about 71°F in the afternoon and slips back to 53°F overnight — a 18°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)
17658
27658
37657
47557
57557
67456
77456
87456
97355
107355
117355
127254
137254
147153
157153
167153
177052
187052
196951
206951
216850
226850
236749
246749
256749
266648
276648
286547
296547
306446

How September really feels in River Falls

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.

River Falls weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan23° / 1.16.36.490.0
Feb28° / 12°1.15.45.310.10.0
Mar41° / 24°2.18.14.311.60.5
Apr55° / 37°3.311.12.413.23.4
May67° / 49°4.412.90.114.65.7
Jun77° / 59°4.612.2015.36.4
Jul81° / 63°3.410.70156.5
Aug78° / 61°4.110.3013.96.8
Sep71° / 53°3.49.6012.36.7
Oct56° / 40°2.79.20.710.74.0
Nov41° / 27°2.073.79.40.5
Dec28° / 15°1.56.76.28.70.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 38% 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 46%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15941
25941
35941
46040
55941
65941
75842
85842
95842
105743
115644
125545
135545
145446
155347
165347
175248
185248
195248
205248
215248
225248
235248
245248
255149
265149
275149
285149
295149
305149

Chance of precipitation in September

Any precipitation

River Falls gets around 3.4 in of rain over 9.6 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
630
730
830
930
1030
1130
1231
1331
1431
1532
1632
1732
1833
1933
2033
2133
2234
2334
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 61% of days. Sticky, muggy-or-worse air turns up on roughly 7% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1382322143
2402321132
3422320132
4442319122
5462318112
6482318101
7492317101
851221791
952221691
1054221581
1154221581
1256221471
1357221470
1459221360
1559221360
1662211250
1762211250
1864201150
1966201040
2067191040
216918940
227018840
237317730
247516630
257615630
267914520
277914520
288212420
298311420
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
87light breeze
97light breeze
108light breeze
118light breeze
128light 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 5:37 AM to 6:13 AM, and sunset from 6:43 PM to 5:47 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.15:376:43
213.05:386:41
313.05:406:39
412.95:416:37
512.95:426:36
612.85:436:34
712.85:456:32
812.75:466:30
912.75:476:28
1012.65:486:26
1112.65:496:24
1212.55:516:22
1312.55:526:20
1412.45:536:18
1512.45:546:16
1612.35:566:14
1712.35:576:12
1812.25:586:10
1912.15:596:08
2012.16:016:06
2112.06:026:04
2212.06:036:02
2311.96:046:00
2411.96:055:58
2511.86:075:56
2611.86:085:54
2711.76:095:52
2811.76:115:50
2911.66:125:49
3011.66:135:47

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.18 kWh/m².

For context, solar energy here swings from a low near 1.41 kWh/m² to a high of 6.27 kWh/m² in July across the year — September's 4.18 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.9Bright
24.8Bright
34.8Bright
44.8Bright
54.7Bright
64.7Bright
74.6Bright
84.5Bright
94.5Bright
104.4Bright
114.4Bright
124.3Bright
134.3Bright
144.2Bright
154.1Bright
164.1Bright
174.0Bright
184.0Moderate
194.0Moderate
203.9Moderate
213.9Moderate
223.8Moderate
233.8Moderate
243.7Moderate
253.7Moderate
263.7Moderate
273.6Moderate
283.6Moderate
293.5Moderate
303.5Moderate
Planning a trip in September

Is September a good time to visit River Falls?

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 River Falls for sightseeing.

What to pack for River Falls in September

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

In September, River Falls sees daytime highs around 71°F and nights near 53°F. Worth packing: rain gear. About 10 days see rain.

rain gear

UV index in River Falls 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 River Falls peaks around June 17 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 17UV 9Jan 12UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar3Moderate
Apr5Moderate
May7Very high
Jun9Very high
Jul8Very high
Aug7Very high
Sep6High
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is River Falls?

River Falls sits at 44.9°N, 92.6°W, 896 ft above sea level, in United States. The nearest listed city is Hastings, 14 mi away.

Topography around River Falls

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

Within 2 miles, the terrain around River Falls has only modest variations in elevation — a maximum elevation change of 341 ft around an average of 951 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 640 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 787 ft.

The land around River Falls is covered by trees (50%) and grassland (21%) within 2 miles, trees (37%), cropland (36%) and grassland (23%) within 10 miles, and trees (41%) and cropland (38%) within 50 miles.

2 miles
341 ft
10 miles
640 ft
50 miles
787 ft
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Hastings 14 mi · Cottage Grove 16 mi · Stillwater 16 mi · Woodbury 17 mi · Oakdale 18 mi · Maplewood 19 mi · South Saint Paul 21 mi · Inver Grove Heights 21 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 River Falls (44.8614°, -92.6238°, elevation 896 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).