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Joliet, IL Weather & Growing Conditions

Today
80°F
Showers And Thunderstorms
Showers and thunderstorms before 1pm, then a chance of showers and thunderstorms. Cloudy. High near 80, with temperatures falling to around 78 in the afternoon. Southeast wind 5 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

7-day forecast

WhenTempForecastWindPrecip
Today 80°F Showers And Thunderstorms 5 to 10 mph SE 77%
Tonight 66°F Showers And Thunderstorms 5 to 10 mph S 94%
Sunday 72°F Showers And Thunderstorms Likely 10 to 15 mph NNE 65%
Sunday Night 58°F Chance Showers And Thunderstorms 15 mph NE 40%
Monday 66°F Chance Rain Showers 15 mph ENE 39%
Monday Night 54°F Chance Rain Showers then Mostly Cloudy 10 to 15 mph NE 32%
Tuesday 64°F Slight Chance Rain Showers 10 to 15 mph NE 18%
Tuesday Night 54°F Mostly Cloudy 5 to 15 mph NE 10%
Wednesday 67°F Partly Sunny 10 mph NNE 9%
Wednesday Night 54°F Mostly Cloudy 5 to 10 mph NNE 2%
Thursday 69°F Partly Sunny 5 to 10 mph NNE 3%
Thursday Night 54°F Mostly Cloudy 0 to 5 mph NNE 3%
Friday 72°F Mostly Sunny 5 to 10 mph NE 3%
Friday Night 54°F Partly Cloudy 0 to 5 mph NE 3%

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

Growing snapshot for Joliet, IL

Last spring frost
Apr 19
First fall frost
Oct 25
Growing season
188 days
Hardiness zone
6a

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

Climate data from the nearest NOAA station, Joliet Brandon Rd Dam, Il (3.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.