Belleville, IL Weather & Growing Conditions
Tonight
54°F
Rain
Rain before 3am, then a slight chance of drizzle. Mostly cloudy, with a low around 54. Southwest wind 7 to 12 mph, with gusts as high as 24 mph. Chance of precipitation is 80%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 54°F | Rain | 7 to 12 mph SW | 79% |
| Wednesday | 63°F | Mostly Cloudy | 7 to 13 mph W | 8% |
| Wednesday Night | 44°F | Partly Cloudy | 5 mph W | 0% |
| Thursday | 65°F | Sunny | 5 to 9 mph W | 1% |
| Thursday Night | 45°F | Mostly Cloudy | 5 mph NW | 8% |
| Friday | 58°F | Partly Sunny | 5 to 10 mph NW | 5% |
| Friday Night | 40°F | Mostly Cloudy | 2 to 6 mph N | 1% |
| Saturday | 56°F | Partly Sunny | 5 mph NW | 0% |
| Saturday Night | 37°F | Partly Cloudy | 2 mph NW | 0% |
| Sunday | 61°F | Sunny | 2 to 7 mph W | 8% |
| Sunday Night | 37°F | Mostly Clear | 3 mph W | 5% |
| Monday | 66°F | Sunny | 2 to 7 mph SW | 2% |
| Monday Night | 41°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 12
First fall frost
Oct 20
Growing season
189 days
Hardiness zone
7a
Explore more for Belleville, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Belleville Siu Rsch, Il (8.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.