Mascoutah, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mascoutah, a city in St. Clair County, Illinois.
This Afternoon
74°F
Rain
Rain and a slight chance of thunderstorms. Cloudy. High near 74, with temperatures falling to around 68 in the afternoon. South wind around 15 mph, with gusts as high as 26 mph. Chance of precipitation is 90%.
7-day forecast for Mascoutah
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 74°F | Rain | 15 mph S | 89% |
| Tonight | 55°F | Rain | 8 to 15 mph S | 96% |
| Wednesday | 65°F | Chance Rain Showers then Mostly Cloudy | 6 to 13 mph W | 12% |
| Wednesday Night | 44°F | Partly Cloudy | 5 mph SW | 0% |
| Thursday | 67°F | Sunny | 3 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 | Partly Cloudy | 1 to 7 mph N | 1% |
| Saturday | 56°F | Partly Sunny | 1 to 5 mph NW | 0% |
| Saturday Night | 36°F | Partly Cloudy | 0 mph | 0% |
| Sunday | 62°F | Sunny | 0 to 7 mph W | 7% |
| Sunday Night | 36°F | Mostly Clear | 3 mph NW | 5% |
| Monday | 66°F | Sunny | 1 to 7 mph W | 2% |
| Monday Night | 40°F | Mostly Clear | 3 mph SW | 0% |
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.