Joliet, IL Weather & Growing Conditions
Overnight
64°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely. Cloudy, with a low around 64. East southeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 64°F | Showers And Thunderstorms Likely | 10 mph ESE | 59% |
| Saturday | 79°F | Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 to 10 mph ESE | 98% |
| Saturday Night | 65°F | Showers And Thunderstorms | 5 mph SSE | 94% |
| Sunday | 71°F | Showers And Thunderstorms Likely | 10 to 15 mph NNE | 65% |
| Sunday Night | 57°F | Chance Showers And Thunderstorms | 15 mph NE | 40% |
| Monday | 65°F | Chance Rain Showers | 15 mph NE | 38% |
| Monday Night | 52°F | Chance Rain Showers then Mostly Cloudy | 10 to 15 mph NE | 31% |
| Tuesday | 64°F | Slight Chance Rain Showers | 10 to 15 mph NE | 19% |
| Tuesday Night | 53°F | Mostly Cloudy | 10 to 15 mph NE | 11% |
| Wednesday | 66°F | Partly Sunny | 10 mph NNE | 10% |
| Wednesday Night | 53°F | Mostly Cloudy | 5 to 10 mph NNE | 3% |
| Thursday | 68°F | Partly Sunny | 5 to 10 mph NNE | 3% |
| Thursday Night | 54°F | Mostly Cloudy | 5 to 10 mph NNE | 3% |
| Friday | 71°F | Mostly Sunny | 5 to 10 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 (4.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.