Mascoutah Weather Forecast
- 58
- 80
Thunderstorms
- 38
- 70
Chance Rain Showers
- 36
- 51
Partly Sunny
- 52
- 69
Mostly Sunny
- 55
- 73
Mostly Cloudy
- 36
- 68
Chance Rain Showers
Today 14 Mar St. Clair
Mostly sunny and windy. Highs around 80. South Winds 15 to 20 Mph with Gusts up to 35 Mph, increasing to 20 to 30 Mph with Gusts up to 50 Mph this afternoon.
Tonight 14 Mar St. Clair
Showers with Thunderstorms likely in the Evening, then partly cloudy with a chance of Thunderstorms after midnight. Some Thunderstorms may be severe. Some Thunderstorms may be severe. Windy with Lows in the upper 50s. South Winds 20 to 30 Mph with Gusts up to 50 Mph, Diminishing to 15 to 20 Mph with Gusts up to 40 Mph after midnight. Chance of rain near 100 percent.
Mascoutah Temperature Statistics
March Temperature
Belleville, Scott AFB/MidAmerica Airport (5 miles)
Lowest 2 March, 2025
22.5 °FAverage March
46.1 °FHighest 11 March, 2025
79.2 °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