Joliet, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Joliet, a city in Will County, Illinois.
This Afternoon
72°F
Slight Chance T-storms
A slight chance of thunderstorms and a slight chance of rain before 1pm, then a chance of rain and a slight chance of thunderstorms. Mostly cloudy. High near 72, with temperatures falling to around 69 in the afternoon. South wind 15 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Joliet
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 72°F | Slight Chance T-storms | 15 to 20 mph S | 42% |
| Tonight | 60°F | Rain | 15 mph S | 87% |
| Wednesday | 63°F | Chance Rain then Mostly Cloudy | 15 mph SSW | 54% |
| Wednesday Night | 48°F | Mostly Cloudy | 15 mph SW | 11% |
| Thursday | 58°F | Mostly Cloudy then Slight Chance Rain | 10 to 15 mph WSW | 24% |
| Thursday Night | 43°F | Chance Rain | 5 to 10 mph WNW | 36% |
| Friday | 54°F | Slight Chance Rain | 10 mph NNW | 23% |
| Friday Night | 36°F | Partly Cloudy | 0 to 10 mph NNW | 7% |
| Saturday | 52°F | Mostly Sunny | 0 to 5 mph WNW | 6% |
| Saturday Night | 35°F | Partly Cloudy | 0 mph | 3% |
| Sunday | 57°F | Mostly Sunny | 0 to 10 mph W | 12% |
| Sunday Night | 35°F | Mostly Clear | 0 to 5 mph WNW | 8% |
| Monday | 62°F | Sunny | 0 to 10 mph WSW | 4% |
| Monday Night | 40°F | Mostly Clear | 0 to 10 mph WSW | 2% |
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 Nov 3, 2026.