Mascoutah, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mascoutah, a city in St. Clair County, Illinois.
Overnight
55°F
Chance Light Rain
A chance of rain 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 around 10 mph, with gusts as high as 24 mph. Chance of precipitation is 40%.
7-day forecast for Mascoutah
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 55°F | Chance Light Rain | 10 mph SW | 36% |
| Wednesday | 64°F | Slight Chance Drizzle then Mostly Cloudy | 6 to 13 mph W | 12% |
| Wednesday Night | 44°F | Partly Cloudy | 5 mph W | 0% |
| Thursday | 66°F | Sunny | 5 to 10 mph W | 0% |
| Thursday Night | 46°F | Mostly Cloudy | 5 mph NW | 1% |
| Friday | 58°F | Partly Sunny | 5 to 12 mph N | 1% |
| Friday Night | 36°F | Partly Cloudy | 1 to 7 mph N | 0% |
| Saturday | 55°F | Mostly Sunny | 1 to 5 mph N | 0% |
| Saturday Night | 34°F | Partly Cloudy | 1 mph N | 0% |
| Sunday | 60°F | Sunny | 0 to 7 mph NW | 1% |
| Sunday Night | 35°F | Clear | 1 mph NW | 0% |
| Monday | 66°F | Sunny | 0 to 5 mph SW | 0% |
| Monday Night | 40°F | Clear | 1 mph SW | 0% |
| Tuesday | 69°F | Sunny | 1 to 5 mph W | 1% |
Forecast source: National Weather Service (api.weather.gov) for Mascoutah (38.518, -89.800). Updated through the day.
Growing snapshot for Mascoutah
Last spring frost
Apr 12
First fall frost
Oct 20
Growing season
189 days
Hardiness zone
6b
More local growing data for Mascoutah: nearby ZIP 62225 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Belleville Siu Rsch, Il (1.6 mi from Mascoutah). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.