Mascoutah Weather Forecast
- 57
- 78
Slight Chance Thunderstorms
- 57
- 79
Thunderstorms
- 38
- 69
Slight Chance Rain Showers
- 34
- 52
Mostly Sunny
- 50
- 68
Mostly Sunny
- 56
- 73
Mostly Cloudy
Today 13 Mar St. Clair
Mostly sunny. Highs in the upper 70s. East Winds 5 to 10 Mph.
Tonight 13 Mar St. Clair
Mostly clear. Not as cool with Lows around 50. East Winds around 5 Mph.
Mascoutah Temperature Statistics
March Temperature
Belleville, Scott AFB/MidAmerica Airport (5 miles)
Lowest 2 March, 2025
22.5 °FAverage March
44.4 °FHighest 10 March, 2025
74.5 °F
Climate (2020–Present)
Belleville, Scott AFB/MidAmerica Airport (5 miles)
Average Low 2020–2025
47.1 °FAverage 2020–2025
56.9 °FAverage High 2020–2025
67.1 °F