Champaign weather in August

In August, Champaign sees average daytime highs of 83°F and overnight lows near 65°F, with 2.9 in of rain across 8.7 wet days and about 13.6 hours of daylight. It is the 2nd-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 83°F through the month. The sky is clear or mostly clear about 40% of the time in August, and the air most often feels muggy.

Daylight stretches from about 14 h 06 min at the start of August to 13 hours by month's end. Set against the rest of the year, August is Champaign's 2nd-clearest and 12th-windiest month. For the whole year in context, see Champaign's year-round climate.

Daytime high
83°
2nd warmest
Overnight low
65°
11th coldest
Rainfall
2.9 in
8.7 wet days
Daylight
13 h 36 min
5:09 AM – 6:45 PM
Cloud cover
52%
2nd clearest
Wind
6 mph
12th windiest
Solar energy
5.7 kWh/m²
Travel score
6.2
out of 10

Champaign is city in Champaign County, Illinois, United States.

Density
1,462/km²
people per km²
Founded
1855

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 83°F through the month.

A typical August day in Champaign reaches about 83°F in the afternoon and slips back to 65°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 76°F and 90°F. Set against its neighbours, August runs on par with July and about 5°F warmer than September.

50°60°70°80°90°151015202531
Avg high (°F)Avg low (°F)
18366
28366
38366
48365
58365
68365
78365
88365
98365
108365
118365
128365
138365
148365
158365
168365
178365
188364
198364
208364
218364
228364
238364
248364
258364
268364
278364
288364
298363
308263
318263

How August really feels in Champaign

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.

Champaign weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan35° / 21°2.78.64.49.50.0
Feb40° / 24°2.37.43.810.40.2
Mar51° / 33°3.310.31.611.72.5
Apr64° / 44°4.511.80.3135.2
May73° / 54°4.713.2014.26.2
Jun81° / 64°4.111.4014.86.0
Jul84° / 67°3.610.4014.65.6
Aug83° / 65°2.98.7013.66.2
Sep78° / 57°3.07.3012.37.3
Oct65° / 46°3.38.50.110.96.1
Nov51° / 35°3.38.70.89.82.7
Dec40° / 26°2.58.93.19.20.1

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 40% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 19% of August, with mostly cloudy or overcast conditions the remaining 41%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16040
26040
36040
46040
56040
66040
75941
85941
95941
105941
115842
125842
135842
145743
155842
165842
175842
185842
195842
205842
215743
225842
235842
245842
255842
265941
275941
285941
296040
306139
316238

Chance of precipitation in August

Any precipitation

Champaign gets around 2.9 in of rain over 8.7 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 28% and peaks near 30% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
128
227
327
426
526
626
726
826
926
1026
1127
1227
1327
1427
1528
1628
1728
1829
1929
2029
2130
2230
2330
2430
2529
2629
2728
2828
2927
3027
3127

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the muggy band about 26% of days. Sticky, muggy-or-worse air turns up on roughly 44% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
17162726221
27172726221
37172726211
48172727211
58182727201
68182727201
78182727201
88192627190
99192627190
109192627190
119202626190
129202626180
1310202626180
1410212626180
1510212626170
1610212626170
1710212626170
1810212626170
1910212626170
2011202626170
2111202626170
2211202626170
2311192626170
2411192727160
2512192626160
2613192626150
2714192626150
2815192626140
2916192526130
3017202526130
3119202425120

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
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

Sunrise & sunset in August

DaylightNight

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

Days shrink by about 66 minutes over August. Sunrise moves from 4:55 AM to 5:24 AM, and sunset from 7:03 PM to 6:22 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.14:557:03
214.14:567:02
314.14:567:01
414.04:577:00
514.04:586:59
614.04:596:58
713.95:006:57
813.95:016:56
913.95:026:54
1013.85:036:53
1113.85:046:52
1213.85:056:50
1313.75:066:49
1413.75:076:48
1513.65:086:46
1613.65:096:45
1713.65:106:44
1813.55:116:42
1913.55:126:41
2013.45:136:39
2113.45:146:38
2213.45:156:36
2313.35:166:35
2413.35:176:33
2513.25:186:32
2613.25:196:30
2713.15:206:29
2813.15:216:27
2913.15:226:25
3013.05:236:24
3113.05:246:22

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.7 kWh/m².

For context, solar energy here swings from a low near 1.77 kWh/m² to a high of 6.41 kWh/m² in June across the year — August's 5.7 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
16.1Intense
26.1Intense
36.1Intense
46.1Intense
56.0Intense
66.0Intense
76.0Bright
85.9Bright
95.9Bright
105.9Bright
115.8Bright
125.8Bright
135.8Bright
145.7Bright
155.7Bright
165.7Bright
175.7Bright
185.6Bright
195.6Bright
205.6Bright
215.5Bright
225.5Bright
235.5Bright
245.5Bright
255.4Bright
265.4Bright
275.4Bright
285.3Bright
295.3Bright
305.3Bright
315.3Bright
Planning a trip in August

Is August a good time to visit Champaign?

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

6.2
Sightseeing
2nd-best month of the year
7.2
Beach & pool
1st-best month of the year

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

What to pack for Champaign in August

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

In August, Champaign sees daytime highs around 83°F and nights near 65°F. Pack light clothes. Worth having: rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

UV index in Champaign 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 Champaign peaks around June 23 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJun 23UV 9Jan 1UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May8Very high
Jun9Very high
Jul9Very high
Aug8Very high
Sep6High
Oct4Moderate
Nov3Moderate
Dec2Low

Air quality in Champaign 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 Champaign is worst in July — around 16 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (October, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateModerateGoodJul 1616 µg/m³Oct 218 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb13Moderate
Mar13Moderate
Apr11Good
May14Moderate
Jun15Moderate
Jul16Moderate
Aug14Moderate
Sep11Good
Oct8Good
Nov8Good
Dec9Good
Location & terrain

Where is Champaign?

Champaign sits at 40.1°N, 88.2°W, 738 ft above sea level, in United States. The nearest listed city is Urbana, 1.9 mi away.

Topography around Champaign

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

Within 2 miles, the terrain around Champaign has only modest variations in elevation — a maximum elevation change of 115 ft around an average of 751 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 200 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 495 ft.

The land around Champaign is covered by artificial surfaces (47%) and trees (37%) within 2 miles, cropland (79%) within 10 miles, and cropland (86%) within 50 miles.

2 miles
115 ft
10 miles
200 ft
50 miles
495 ft
treesgrasslandcroplandartificial surfacesbare terrain
August weather nearby: Urbana 1.9 mi · Danville 32 mi · Decatur 42 mi · Charleston 43 mi · Mattoon 44 mi · Bloomington 47 mi · Normal 48 mi · Terre Haute 63 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 Champaign (40.1164°, -88.2434°, elevation 738 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).