| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Saturday, 21-Mar-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Sunny. Near record warmth. High 87°. UV index up to 6. Wind south-southeast around 4 mph, gusting to 22 mph. |
| Tonight |
Clear in the evening, becoming mostly clear after midnight. Low 53°. Wind south around 4 mph in the evening, becoming 7 mph after midnight. |
| Sunday |
Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Exceptionally hot. High 86°. UV index up to 5. Wind southwest around 8 mph, gusting to 28 mph, in the morning, becoming northwest in the afternoon. |
| Sunday night |
Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 40°. Wind north-northwest around 13 mph, gusting to 30 mph, in the evening, becoming 9 mph, gusting to 26 mph, after midnight. |
| Monday |
Partly cloudy. High 60°. UV index up to 5. Wind north-northeast around 7 mph, gusting to 27 mph. |
| Monday night |
Partly to mostly cloudy in the evening, becoming cloudy after midnight. Low 41°. Wind east-northeast around 4 mph, gusting to 20 mph. |
| Tuesday |
Partly cloudy. Mild. High 67°. UV index up to 5. Wind southeast around 5 mph, gusting to 24 mph. |
| Tuesday night |
Partly cloudy. Low 39°. Wind south-southeast around 5 mph, gusting to 21 mph. |
| Wednesday |
Partly cloudy. Unusually warm. High 75°. UV index up to 6. Wind south around 7 mph, gusting to 25 mph. |
| Wednesday night |
Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 45°. Wind south-southwest around 5 mph, gusting to 18 mph. |
| Thursday |
Mostly sunny. Exceptionally hot. High 87°. UV index up to 7. Wind west-southwest around 5 mph, gusting to 21 mph, in the morning, becoming 9 mph, gusting to 26 mph, in the afternoon. |
| Thursday night |
Cloudy in the evening, becoming dense overcast after midnight. A chance of rain. Scattered thunderstorms likely. Breezy. Low 48°. Wind north-northeast around 11 mph, gusting to 27 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Friday |
Dense overcast. Rain likely. High 50°, but temperatures falling in the afternoon. Wind north-northeast around 9 mph, gusting to 26 mph. Chance of precipitation 70 percent. Precipitation mostly around an inch. |
| Friday night |
Cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog. A chance of rain. Low 42°. Wind north-northeast around 5 mph, gusting to 21 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
WXSIM forecast formatting script by Saratoga-Weather.org.