Illinois weather, town by town

About Illinois weather

The map on the Now tab shows every Illinois town's current temperature from our own server, one dot per town. Tap any dot, or type a town above, for that town's full forecast.

What the weather is usually like

Across the 1425 Illinois towns with station normals, the warmest month is July, when the day usually reaches 86°F, and the coldest is January, when the night usually falls to 18°F. May is the wettest, with rain on about 12 days. July afternoons run from about 81°F in Beach Park to 91°F in Baldwin. January nights run from about 10°F in Apple Canyon Lake to 27°F in Brookport.

Means of the 1991 to 2020 station normals serving these towns, as published by NOAA; each town's page carries its own.

Where these numbers come from

• Current conditions and forecast: NOAA forecast grids decoded on our own server, corrected against the nearest reporting station and our own radar. Open-Meteo is consulted only as a fallback when our server is silent.
• Records: computed by myweatherrock from NOAA GHCN-Daily station records at the stations serving these towns. Measurements, not estimates.
• Warnings and alerts: the National Weather Service, passed through unchanged.

Illinois weather records

Measured at the NOAA stations serving these towns, daily records 1866 to 2026. Station extremes, not official state records.

Common questions about Illinois weather

What is the hottest temperature recorded at a Illinois station?

116°F at Alton - Melvin Price LandD on July 10, 1946, in the NOAA daily station records myweatherrock holds (1866 to 2026).

What is the coldest temperature recorded at a Illinois station?

-38°F at Mt Carroll on January 31, 2019.

What is the most rain a Illinois station has measured in one day?

16.91 inches at Aurora Water on July 18, 1996.

What is the biggest one-day snowfall at a Illinois station?

22 inches at Quincy Dam 21 on February 2, 2011.

How many Illinois towns have a weather page here?

1,456: 977 villages, 298 cities, 165 census-designated places, 16 towns. Each page carries current conditions, the hourly timeline, the ten day outlook, radar, and where a station sits close enough, measured records.

Where does the Illinois forecast come from?

NOAA forecast grids (the National Weather Service digital forecast, the National Blend of Models, HRRR and GFS) decoded on our own server, corrected against the nearest reporting station and our own radar. Open-Meteo is consulted only as a fallback when our server is silent.