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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| 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.