Mascoutah, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mascoutah, a city in St. Clair County, Illinois.
Overnight
73°F
Clear
Clear, with a low around 73. Southeast wind around 5 mph.
7-day forecast for Mascoutah
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 73°F | Clear | 5 mph SE | 4% |
| Saturday | 97°F | Mostly Sunny | 2 to 7 mph SW | 4% |
| Saturday Night | 73°F | Partly Cloudy | 3 mph S | 4% |
| Sunday | 93°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 2 to 6 mph W | 19% |
| Sunday Night | 67°F | Showers And Thunderstorms Likely | 5 to 8 mph NE | 56% |
| Monday | 79°F | Showers And Thunderstorms Likely | 6 to 12 mph NE | 63% |
| Monday Night | 59°F | Showers And Thunderstorms Likely | 6 to 12 mph NE | 59% |
| Tuesday | 72°F | Slight Chance Rain Showers then Partly Sunny | 12 mph N | 21% |
| Tuesday Night | 54°F | Mostly Cloudy | 6 to 12 mph N | 6% |
| Wednesday | 74°F | Mostly Sunny | 7 to 10 mph N | 1% |
| Wednesday Night | 55°F | Partly Cloudy | 2 to 9 mph N | 0% |
| Thursday | 76°F | Mostly Sunny | 3 to 8 mph N | 1% |
| Thursday Night | 57°F | Partly Cloudy | 2 to 8 mph NE | 3% |
| Friday | 78°F | Mostly Sunny | 2 to 8 mph NE | 5% |
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 Sep 19, 2026.