Joliet, IL Weather & Growing Conditions
Today
84°F
Mostly Sunny
Mostly sunny, with a high near 84. South southwest wind 5 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Mostly Sunny | 5 to 10 mph SSW | 0% |
| Tonight | 68°F | Mostly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph SSW | 18% |
| Wednesday | 81°F | Chance Showers And Thunderstorms | 5 mph SW | 59% |
| Wednesday Night | 66°F | Showers And Thunderstorms | 5 mph W | 90% |
| Thursday | 80°F | Chance Showers And Thunderstorms | 0 to 5 mph SE | 77% |
| Thursday Night | 64°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SSE | 36% |
| Friday | 83°F | Mostly Sunny | 0 to 5 mph S | 5% |
| Friday Night | 65°F | Mostly Clear | 0 to 5 mph S | 9% |
| Saturday | 85°F | Mostly Sunny | 0 to 5 mph SSW | 11% |
| Saturday Night | 70°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph SSW | 15% |
| Sunday | 87°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 5 to 10 mph SW | 15% |
| Sunday Night | 71°F | Chance Showers And Thunderstorms | 5 to 10 mph SSW | 36% |
| Monday | 87°F | Chance Rain Showers | 5 to 10 mph SSW | 36% |
| Monday Night | 70°F | Chance Showers And Thunderstorms | 5 to 10 mph E | 42% |
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 Aug 4, 2026.