Belleville, IL Weather & Growing Conditions
Tonight
55°F
Rain
Rain before 3am, then a slight chance of drizzle. Mostly cloudy, with a low around 55. Southwest wind around 10 mph, with gusts as high as 23 mph. Chance of precipitation is 80%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 55°F | Rain | 10 mph SW | 78% |
| Wednesday | 63°F | Mostly Cloudy | 7 to 14 mph W | 8% |
| Wednesday Night | 45°F | Mostly Clear | 6 mph W | 0% |
| Thursday | 65°F | Sunny | 6 to 10 mph W | 1% |
| Thursday Night | 46°F | Mostly Cloudy | 6 mph NW | 9% |
| Friday | 58°F | Mostly Cloudy | 6 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 | 2 mph NW | 0% |
| Sunday | 62°F | Sunny | 2 to 7 mph W | 8% |
| Sunday Night | 39°F | Mostly Clear | 5 mph W | 5% |
| Monday | 66°F | Sunny | 2 to 7 mph SW | 2% |
| Monday Night | 43°F | Mostly Clear | 3 mph SW | 1% |
| Tuesday | 69°F | Sunny | 6 mph W | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Belleville, IL
Last spring frost
Apr 8
First fall frost
Oct 26
Growing season
200 days
Hardiness zone
7a
Explore more for Belleville, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Cahokia St Louis Ap, Il (5.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.