Belleville, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Belleville, a city in St. Clair County, Illinois.
This Afternoon
73°F
Rain
Rain and a slight chance of thunderstorms. Cloudy. High near 73, with temperatures falling to around 68 in the afternoon. South wind 17 to 21 mph, with gusts as high as 31 mph. Chance of precipitation is 90%.
7-day forecast for Belleville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 73°F | Rain | 17 to 21 mph S | 92% |
| Tonight | 55°F | Rain | 8 to 17 mph S | 98% |
| Wednesday | 64°F | Chance Rain Showers then Mostly Cloudy | 7 to 13 mph W | 10% |
| Wednesday Night | 46°F | Partly Cloudy | 5 mph SW | 0% |
| Thursday | 67°F | Sunny | 5 to 9 mph W | 1% |
| Thursday Night | 47°F | Mostly Cloudy | 5 mph NW | 8% |
| Friday | 59°F | Mostly Cloudy | 5 to 10 mph NW | 6% |
| Friday Night | 41°F | Partly Cloudy | 2 to 7 mph N | 1% |
| Saturday | 56°F | Partly Sunny | 5 mph NW | 0% |
| Saturday Night | 38°F | Partly Cloudy | 1 mph NW | 0% |
| Sunday | 62°F | Sunny | 1 to 7 mph W | 8% |
| Sunday Night | 39°F | Mostly Clear | 5 mph W | 5% |
| Monday | 67°F | Sunny | 2 to 7 mph SW | 2% |
| Monday Night | 43°F | Mostly Clear | 3 mph SW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Belleville (38.516, -89.990). Updated through the day.
Growing snapshot for Belleville
Last spring frost
Apr 12
First fall frost
Oct 20
Growing season
189 days
Hardiness zone
7a
More local growing data for Belleville: nearby ZIP 62226 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Belleville Siu Rsch, Il (8.4 mi from Belleville). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.