Marysville Weather Forecast
- 58
- 82
Increasing Clouds
- 51
- 70
Partly Sunny
- 54
- 74
Partly Sunny
- 61
- 81
Mostly Cloudy
- 60
- 79
Chance Rain Showers
- 58
- 79
Chance Rain Showers
Today 18 Sep St. Clair
Mostly sunny. A slight chance of Showers in the afternoon. Highs in the lower 80s. Temperatures falling into the in the lower 70s in the afternoon. Northwest Winds up to 10 Mph, becoming north in the afternoon. Chance of rain 20 percent.
Tonight 18 Sep St. Clair
Partly cloudy in the Evening, then becoming mostly cloudy. Lows in the upper 50s. Northeast Winds up to 10 Mph.
Marysville Temperature Statistics
September Temperature
St Clair County International Airport (1.9 miles)
Lowest 7 September, 2025
37.4 °FAverage September
59.1 °FHighest 3 September, 2025
80.6 °F
Climate (2020–Present)
St Clair County International Airport (1.9 miles)
Average Low 2020–2025
40 °FAverage 2020–2025
49.5 °FAverage High 2020–2025
58.6 °F