O'Fallon Weather Forecast
- 60
- 77
Decreasing Clouds
- 56
- 82
Rain Showers
- 61
- 74
Chance Thunderstorms
- 65
- 78
Rain Showers Likely
- 62
- 84
Rain Showers Likely
- 60
- 85
Rain Showers Likely
- 55
- 79
Chance Rain Showers
Today 3 May St. Charles
Mostly cloudy. Near steady temperature in the mid 70s. Northeast Winds around 5 Mph.
Tonight 3 May St. Charles
Partly cloudy. Lows around 60. Northeast Winds around 5 Mph.
O'Fallon Temperature Statistics
May Temperature
St. Louis, Spirit Of St. Louis Airport (10.6 miles)
Lowest 1 May, 2024
59 °FAverage May
69.1 °FHighest 1 May, 2024
77 °F
Climate (2019–Present)
St. Louis, Spirit Of St. Louis Airport (10.6 miles)
Average Low 2019–2024
46.2 °FAverage 2019–2024
56.7 °FAverage High 2019–2024
67.7 °F