Climate averages 1991–2020
Champaign weather
in August.
A warm, moderately wet month: the 2nd warmest and the 4th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a warm month in Champaign: daytime highs average 27.9°C and nights cool to about 18.7°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 74 mm of rain on roughly 9 days, which makes August a moderately wet month (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 45 min on an average August day.
The nearest other city in this atlas is Decatur (68 km away). In August its highs average 28.3°C, about as warm as Champaign, with 77 mm of rain.
Among the 498 cities listed in the United States, Champaign ranks joint 331st of 498 for the warmest August highs and joint 237th of 498 for the driest August (rainfall, lowest first). The mean August high of those 498 cities is 29.9°C; Champaign is 2.0°C cooler than that mean.
From August to September, average highs fall by 3.2°C to 24.7°C, and monthly rainfall rises from 74 mm to 77 mm.
The annual picture
August in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Champaign climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 1.5°C-6.7°C | -6.7°C | 70 | 8.6 | 9.710 h |
| February | 4.1°C-5.2°C | -5.2°C | 59 | 7.4 | 10.711 h |
| March | 10.2°C0.0°C | 0.0°C | 85 | 10.3 | 11.912 h |
| April | 16.8°C6.1°C | 6.1°C | 115 | 11.8 | 13.213 h |
| May | 22.2°C12.2°C | 12.2°C | 118 | 13.2 | 14.414 h |
| June | 26.7°C17.3°C | 17.3°C | 105 | 11.4 | 15.015 h |
| July | 28.3°C19.3°C | 19.3°C | 92 | 10.3 | 14.715 h |
| August, selected | 27.9°C18.7°C | 18.7°C | 74 | 8.6 | 13.814 h |
| September | 24.7°C14.9°C | 14.9°C | 77 | 7.3 | 12.512 h |
| October | 17.9°C8.7°C | 8.7°C | 84 | 8.5 | 11.211 h |
| November | 10.2°C1.9°C | 1.9°C | 83 | 8.7 | 10.010 h |
| December | 3.9°C-3.5°C | -3.5°C | 65 | 8.9 | 9.49 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- Decatur in AugustUnited States · 68 kmHigh 28.3°C · Low 19.3°C · 77 mm rain
- Bloomington (Illinois), United States in AugustUnited States · 76 kmHigh 27.6°C · Low 18.7°C · 82 mm rain
- Lafayette (Indiana), United States in AugustUnited States · 121 kmHigh 27.6°C · Low 18.4°C · 82 mm rain
- Springfield (Illinois), United States in AugustUnited States · 124 kmHigh 28.6°C · Low 19.5°C · 78 mm rain
- Peoria (Illinois), United States in AugustUnited States · 131 kmHigh 28.0°C · Low 19.4°C · 79 mm rain
- Joliet in AugustUnited States · 157 kmHigh 27.4°C · Low 18.5°C · 93 mm rain
- Hammond in AugustUnited States · 175 kmHigh 26.5°C · Low 19.6°C · 94 mm rain
- Bolingbrook in AugustUnited States · 177 kmHigh 26.8°C · Low 18.2°C · 95 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Champaign) is explained once on the Champaign year overview and on the Sources, method and limits page.