Joliet, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Joliet, a city in Will County, Illinois.
Today
85°F
Mostly Sunny
Mostly sunny, with a high near 85. South southwest wind 5 to 10 mph.
7-day forecast for Joliet
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Mostly Sunny | 5 to 10 mph SSW | 5% |
| Tonight | 68°F | Mostly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph S | 16% |
| Wednesday | 81°F | Chance Showers And Thunderstorms | 5 mph SW | 57% |
| 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 | 37% |
| 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 | 70°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 NE | 41% |
Forecast source: National Weather Service (api.weather.gov) for Joliet (41.518, -88.149). Updated through the day.
Growing snapshot for Joliet
Last spring frost
Apr 19
First fall frost
Oct 25
Growing season
188 days
Hardiness zone
6a
More local growing data for Joliet: nearby ZIP 60435 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Joliet Brandon Rd Dam, Il (3.4 mi from Joliet). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.