| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Monday, 09-Mar-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Mostly sunny in the morning, becoming partly to mostly sunny in the afternoon. Exceptionally hot. High 82°. UV index up to 5. Wind south-southwest around 8 mph, gusting to 28 mph, in the morning, becoming 11 mph, gusting to 30 mph, in the afternoon. |
| Tonight |
Fair to partly cloudy. Patchy light fog after midnight. Mild. Low 59°. Wind south-southwest around 8 mph, gusting to 25 mph. |
| Tuesday |
Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Light to moderate fog in the morning. Exceptionally hot. High 81°. Wind south-southwest around 7 mph, gusting to 22 mph, in the morning, becoming 12 mph, gusting to 29 mph, in the afternoon. |
| Tuesday night |
Mostly cloudy in the evening, becoming dense overcast after midnight. Patchy light fog after midnight. A slight chance of rain in the evening, then rain likely after midnight. Scattered thundershowers possible. Unusually warm. Low 65°. Wind south-southwest around 10 mph, gusting to 24 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Wednesday |
Dense overcast. Patchy light fog. Rain likely in the morning, then a chance of rain in the afternoon. Scattered thundershowers possible. Mild. High 66°, but temperatures falling in the afternoon. Wind west-southwest around 10 mph, gusting to 28 mph, in the morning, becoming north-northwest in the afternoon. Chance of precipitation 80 percent. Precipitation mostly around half an inch. |
| Wednesday night |
Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 37°. Wind north-northwest around 10 mph, gusting to 27 mph, in the evening, becoming 6 mph, gusting to 21 mph, after midnight. |
| Thursday |
Sunny in the morning, becoming mostly sunny in the afternoon. High 55°. Wind northwest around 4 mph, gusting to 22 mph, in the morning, becoming southwest in the afternoon. |
| Thursday night |
Partly cloudy. Breezy. Low 42°. Wind south-southwest around 8 mph, gusting to 20 mph, in the evening, becoming 15 mph, gusting to 22 mph, after midnight. |
| Friday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Mild. High 61°. UV index up to 4. Wind west-southwest around 12 mph, gusting to 23 mph, in the morning, becoming northwest around 8 mph, gusting to 23 mph, in the afternoon. |
| Friday night |
Partly cloudy in the evening, becoming mostly clear after midnight. Low 35°. Wind north-northeast around 4 mph, gusting to 18 mph, in the evening, becoming east after midnight. |
| Saturday |
Sunny. Unusually warm. High 70°. UV index up to 5. Wind southeast around 8 mph, gusting to 25 mph. |
| Saturday night |
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Relatively mild. Low 51°. Wind south-southwest around 10 mph, gusting to 18 mph. |
| Sunday |
Mostly cloudy in the morning, becoming cloudy in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. Breezy and mild. High 65°. Wind south-southwest around 13 mph, gusting to 31 mph, in the morning, becoming north-northwest in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday night |
Cloudy. Breezy. Low 37°. Wind north-northwest around 12 mph, gusting to 29 mph. |
WXSIM forecast formatting script by Saratoga-Weather.org.
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