Mascoutah, IL Weather & Growing Conditions
Tonight
55°F
Rain Likely
Rain likely before 3am, then a slight chance of drizzle between 3am and 5am, then a slight chance of rain. Mostly cloudy, with a low around 55. Southwest wind 8 to 14 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 55°F | Rain Likely | 8 to 14 mph SW | 58% |
| Wednesday | 64°F | Slight Chance Drizzle then Mostly Cloudy | 6 to 13 mph W | 11% |
| Wednesday Night | 44°F | Partly Cloudy | 5 mph SW | 0% |
| Thursday | 66°F | Sunny | 5 to 10 mph W | 1% |
| Thursday Night | 45°F | Mostly Cloudy | 3 mph NW | 6% |
| Friday | 59°F | Mostly Cloudy | 5 to 10 mph NW | 6% |
| Friday Night | 39°F | Mostly Cloudy | 1 to 6 mph N | 1% |
| Saturday | 56°F | Partly Sunny | 3 mph NW | 0% |
| Saturday Night | 35°F | Partly Cloudy | 0 mph | 0% |
| Sunday | 62°F | Sunny | 0 to 6 mph W | 7% |
| Sunday Night | 36°F | Mostly Clear | 2 mph NW | 5% |
| Monday | 67°F | Sunny | 1 to 7 mph W | 2% |
| Monday Night | 40°F | Mostly Clear | 2 mph SW | 0% |
| Tuesday | 69°F | Sunny | 5 mph W | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Mascoutah, IL
Last spring frost
Apr 12
First fall frost
Oct 20
Growing season
189 days
Hardiness zone
6b
Explore more for Mascoutah, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Belleville Siu Rsch, Il (5.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.