Sun Prairie weather in August

In August, Sun Prairie sees average daytime highs of 79°F and overnight lows near 61°F, with 3.7 in of rain across 10.3 wet days and about 13.8 hours of daylight. It is the 2nd-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 79°F through the month. The sky is clear or mostly clear about 35% of the time in August, and the air most often feels comfortable.

Daylight stretches from about 14 h 24 min at the start of August to 13 h 06 min by month's end. Set against the rest of the year, August is Sun Prairie's 3rd-clearest and 12th-windiest month. For the whole year in context, see Sun Prairie's year-round climate.

Daytime high
79°
2nd warmest
Overnight low
61°
11th coldest
Rainfall
3.7 in
10.3 wet days
Daylight
13 h 48 min
5:07 AM – 6:55 PM
Cloud cover
55%
3rd clearest
Wind
6 mph
12th windiest
Solar energy
5.36 kWh/m²
Travel score
6.7
out of 10

Sun Prairie is third-class city in Dane County, Wisconsin, United States.

Density
1,038/km²
people per km²
Founded
1839

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

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 79°F through the month.

A typical August day in Sun Prairie reaches about 79°F in the afternoon and slips back to 61°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 71°F and 86°F. Set against its neighbours, August runs about 2°F cooler than July and about 7°F warmer than September.

50°60°70°80°90°151015202531
Avg high (°F)Avg low (°F)
18063
28063
38063
48062
58062
68062
78062
88062
97962
107962
117962
127962
137961
147961
157961
167961
177961
187961
197961
207861
217861
227861
237860
247860
257860
267860
277860
287860
297859
307759
317759

How August really feels in Sun Prairie

Once humidity and wind are folded in, August 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

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

Sun Prairie weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan27° / 13°1.67.66.69.20.0
Feb31° / 16°1.56.75.510.20.0
Mar43° / 26°2.48.93.611.60.8
Apr56° / 38°3.912.41.913.13.5
May68° / 49°3.912.30.114.45.8
Jun77° / 59°4.311.8015.16.4
Jul81° / 63°3.49.9014.96.5
Aug79° / 61°3.710.3013.86.7
Sep72° / 53°3.19012.36.9
Oct59° / 41°2.98.90.310.84.5
Nov44° / 30°2.27.92.29.50.9
Dec32° / 19°1.97.55.28.90.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

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

Beyond those clear spells, partly cloudy skies cover about 20% of August, with mostly cloudy or overcast conditions the remaining 45%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15743
25743
35743
45842
55743
65743
75644
85644
95545
105446
115446
125446
135347
145347
155347
165347
175347
185347
195347
205347
215347
225347
235347
245446
255446
265545
275644
285743
295743
305743
315743

Chance of precipitation in August

Any precipitation

Sun Prairie gets around 3.7 in of rain over 10.3 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 33% and peaks near 34% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
134
234
334
434
533
633
733
833
933
1033
1133
1233
1333
1433
1534
1634
1734
1834
1934
2034
2134
2234
2334
2433
2533
2632
2731
2831
2930
3029
3129

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the comfortable band about 25% of days. Sticky, muggy-or-worse air turns up on roughly 27% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1172627228
2172627228
3172627228
4182626218
5182626218
6192626218
7192626218
8202626217
9202626217
10202625217
11212625217
12212625216
13212725216
14212625216
15212726215
16212625225
17212625225
18222625234
19222525244
20222525244
21222525244
22222525243
23232525243
24232524243
25242524243
26252524233
27262424233
28272423223
29292423213
30302423203
31322423193

Wind in August

Winds average 6 mph in August, the calmest month.

Across August, daily wind ranges from about 6 mph on the calmest days to 7 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 h 24 min at the start of August to 13 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 78 minutes over August. Sunrise moves from 4:51 AM to 5:24 AM, and sunset from 7:15 PM to 6:29 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.44:517:15
214.44:527:14
314.34:537:13
414.34:547:11
514.24:557:10
614.24:567:09
714.24:577:07
814.14:587:06
914.15:007:05
1014.05:017:03
1114.05:027:02
1214.05:037:00
1313.95:046:59
1413.95:056:58
1513.85:066:56
1613.85:076:55
1713.75:096:53
1813.75:106:51
1913.75:116:50
2013.65:126:48
2113.65:136:47
2213.55:146:45
2313.55:156:43
2413.45:166:42
2513.45:186:40
2613.35:196:38
2713.35:206:36
2813.25:216:35
2913.25:226:33
3013.15:236:31
3113.15:246:29

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.36 kWh/m².

For context, solar energy here swings from a low near 1.57 kWh/m² to a high of 6.28 kWh/m² in June across the year — August's 5.36 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.9Bright
25.9Bright
35.8Bright
45.8Bright
55.7Bright
65.7Bright
75.7Bright
85.6Bright
95.6Bright
105.5Bright
115.5Bright
125.5Bright
135.4Bright
145.4Bright
155.4Bright
165.3Bright
175.3Bright
185.3Bright
195.2Bright
205.2Bright
215.2Bright
225.2Bright
235.2Bright
245.1Bright
255.1Bright
265.1Bright
275.1Bright
285.0Bright
295.0Bright
305.0Bright
315.0Bright
Planning a trip in August

Is August a good time to visit Sun Prairie?

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

6.7
Sightseeing
2nd-best month of the year
6.4
Beach & pool
2nd-best month of the year

August is a reasonable time to visit Sun Prairie for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Sun Prairie in August

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

In August, Sun Prairie sees daytime highs around 79°F and nights near 61°F. Worth packing: light clothes, rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

UV index in Sun Prairie in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Sun Prairie peaks around June 18 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 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 18UV 9Dec 21UV 1
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr6High
May8Very high
Jun9Very high
Jul8Very high
Aug8Very high
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low

Air quality in Sun Prairie in August

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where August falls, not just the annual average.

Air quality in Sun Prairie is worst in July — around 15 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (October, 8 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateModerateGoodJul 1715 µg/m³Oct 248 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb13Moderate
Mar13Moderate
Apr12Good
May13Moderate
Jun14Moderate
Jul15Moderate
Aug14Moderate
Sep11Good
Oct8Good
Nov8Good
Dec9Good
Location & terrain

Where is Sun Prairie?

Sun Prairie sits at 43.2°N, 89.2°W, 958 ft above sea level, in United States. The nearest listed city is Madison, 12 mi away.

Topography around Sun Prairie

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

Within 2 miles, the terrain around Sun Prairie has only modest variations in elevation — a maximum elevation change of 154 ft around an average of 971 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 269 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,043 ft.

The land around Sun Prairie is covered by cropland (32%), artificial surfaces (28%) and grassland (21%) within 2 miles, cropland (53%) within 10 miles, and cropland (48%) and trees (30%) within 50 miles.

2 miles
154 ft
10 miles
269 ft
50 miles
1,043 ft
treesgrasslandcroplandartificial surfaceswater
August weather nearby: Madison 12 mi · Middleton 16 mi · Fitchburg 20 mi · Watertown 24 mi · Beaver Dam 27 mi · Janesville 36 mi · Oconomowoc 37 mi · Beloit 48 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 Sun Prairie (43.1836°, -89.2137°, elevation 958 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. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).