| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Monday, 16-Feb-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Partly cloudy. Low 40°. Wind south around 7 mph, gusting to 24 mph. |
| Tuesday |
Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Unusually warm. High 71°. Wind south around 6 mph, gusting to 18 mph, in the morning, becoming 9 mph, gusting to 25 mph, in the afternoon. |
| Tuesday night |
Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Breezy and relatively mild. Low 49°. Wind south around 13 mph, gusting to 23 mph. |
| Wednesday |
Sunny in the morning, becoming mostly sunny in the afternoon. Exceptionally warm. High 76°. Wind west-southwest around 10 mph, gusting to 24 mph, in the morning, becoming 7 mph, gusting to 27 mph, in the afternoon. |
| Wednesday night |
Fair to partly cloudy in the evening, becoming mostly clear after midnight. Patchy light fog after midnight. Relatively mild. Low 45°. Wind southeast around 4 mph, gusting to 15 mph. |
| Thursday |
Sunny. Moderate fog in the morning. Exceptionally warm. High 74°. Wind southeast around 6 mph, gusting to 21 mph, in the morning, becoming south-southwest around 12 mph, gusting to 28 mph, in the afternoon. |
| Thursday night |
Clear. Breezy. Low 36°. Wind west-southwest around 12 mph, gusting to 27 mph. |
| Friday |
Partly cloudy. High 52°. Wind west around 11 mph, gusting to 29 mph. |
| Friday night |
Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 29°. Wind west around 5 mph, gusting to 23 mph, in the evening, becoming northwest after midnight. |
| Saturday |
Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. High 46°. Wind northwest around 7 mph, gusting to 25 mph, in the morning, becoming 10 mph, gusting to 27 mph, in the afternoon. |
| Saturday night |
Partly cloudy in the evening, becoming clear after midnight. Low 26°. Wind chill ranging from 19 to 39. Wind northwest around 9 mph, gusting to 25 mph. |
| Sunday |
Sunny. Breezy. High 33°. Wind chill ranging from 16 to 22. Wind northwest around 13 mph, gusting to 32 mph, in the morning, becoming 16 mph, gusting to 32 mph, in the afternoon. |
| Sunday night |
Clear. Breezy and cold. Low 20°. Wind chill ranging from 10 to 22. Wind northwest around 11 mph, gusting to 28 mph. |
WXSIM forecast formatting script by Saratoga-Weather.org.