| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Monday, 27-Oct-2025 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Cloudy. Low 50°. Wind east-northeast around 2 mph. |
| Tuesday |
Cloudy in the morning, becoming dense overcast in the afternoon. A chance of rain. High 56°. Wind east-southeast around 3 mph, gusting to 18 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday night |
Dense overcast. Patchy light fog. A chance of rain in the evening, then rain likely after midnight. Low 49°. Wind east around 6 mph, gusting to 18 mph, in the evening, becoming 10 mph, gusting to 22 mph, after midnight. Chance of precipitation 80 percent. Precipitation mostly around half an inch. |
| Wednesday |
Dense overcast in the morning, becoming mostly cloudy to cloudy in the afternoon. A chance of rain in the morning, then a slight chance of rain in the afternoon. Breezy. High 53°. Wind northeast around 12 mph, gusting to 27 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch. |
| Wednesday night |
Clear. Patchy light fog. Low 39°. Wind north around 7 mph, gusting to 22 mph. |
| Thursday |
Partly to mostly sunny in the morning, becoming mostly sunny in the afternoon. Light to moderate fog in the morning. High 56°. Wind north-northwest around 7 mph, gusting to 25 mph. |
| Thursday night |
Partly cloudy in the evening, becoming clear after midnight. Patchy light fog after midnight. Low 37°. Wind west-northwest around 5 mph, gusting to 17 mph. |
| Friday |
Sunny. Patchy light fog in the morning. High 59°. Wind west around 6 mph, gusting to 24 mph, in the morning, becoming 10 mph, gusting to 27 mph, in the afternoon. |
| Friday night |
Partly cloudy. Low 39°. Wind west around 4 mph, gusting to 18 mph. |
| Saturday |
Partly cloudy in the morning, becoming mostly cloudy in the afternoon. High 53°. Wind west-northwest around 4 mph, gusting to 24 mph, in the morning, becoming 7 mph, gusting to 25 mph, in the afternoon. |
| Saturday night |
Partly to mostly cloudy. Low 40°. Wind west-northwest around 3 mph, gusting to 18 mph. |
| Sunday |
Partly to mostly sunny in the morning, becoming mostly sunny in the afternoon. High 59°. Wind west-southwest around 4 mph, gusting to 24 mph, in the morning, becoming 8 mph, gusting to 24 mph, in the afternoon. |
| Sunday night |
Mostly clear in the evening, becoming partly cloudy after midnight. Low 40°. Wind south-southwest around 7 mph, gusting to 16 mph. |
WXSIM forecast formatting script by Saratoga-Weather.org.