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Mundelein, IL Weather & Growing Conditions

Tonight
61°F
Chance Showers And Thunderstorms
A slight chance of rain showers before midnight, then a chance of showers and thunderstorms between midnight and 1am, then showers and thunderstorms likely. Cloudy, with a low around 61. East southeast wind 10 to 15 mph. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.

7-day forecast

WhenTempForecastWindPrecip
Tonight 61°F Chance Showers And Thunderstorms 10 to 15 mph ESE 66%
Saturday 75°F Showers And Thunderstorms then Showers And Thunderstorms Likely 10 to 15 mph SE 94%
Saturday Night 62°F Showers And Thunderstorms Likely then Showers And Thunderstorms 5 to 10 mph ENE 80%
Sunday 67°F Showers And Thunderstorms Likely 10 to 15 mph NNE 74%
Sunday Night 55°F Chance Rain Showers 15 mph NE 46%
Monday 64°F Chance Rain Showers 15 mph ENE 41%
Monday Night 51°F Chance Rain Showers 10 to 15 mph ENE 36%
Tuesday 62°F Slight Chance Rain Showers 10 to 15 mph NE 21%
Tuesday Night 51°F Slight Chance Rain Showers then Mostly Cloudy 5 to 10 mph NE 17%
Wednesday 64°F Partly Sunny 5 to 10 mph NE 11%
Wednesday Night 52°F Mostly Cloudy 5 mph NNE 4%
Thursday 67°F Partly Sunny 5 mph NNE 6%
Thursday Night 52°F Mostly Cloudy 0 to 5 mph NNE 4%
Friday 69°F Mostly Sunny 0 to 5 mph NNE 4%

Forecast source: National Weather Service (api.weather.gov). Updated through the day.

Growing snapshot for Mundelein, IL

Last spring frost
Apr 29
First fall frost
Oct 20
Growing season
172 days
Hardiness zone
5b

Explore more for Mundelein, IL: full frost dates · planting calendar · Illinois frost dates

Climate data from the nearest NOAA station, Mundelein 4 Wsw, Il (2.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.