| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Thursday, 07-May-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Mostly sunny in the morning, becoming partly cloudy in the afternoon. High 66°. UV index up to 6. Wind southwest around 6 mph, gusting to 26 mph, in the morning, becoming 10 mph, gusting to 27 mph, in the afternoon. |
| Tonight |
Fair in the evening, becoming fair to partly cloudy after midnight. Cool. Low 47°. Wind southwest around 6 mph, gusting to 22 mph. |
| Friday |
Partly 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. High 73°. UV index up to 5. Wind southwest around 7 mph, gusting to 25 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Friday night |
Cloudy in the evening, becoming mostly clear after midnight. Patchy light fog in the evening, then moderate fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Cool. Low 51°. Wind west-southwest around 5 mph. Chance of precipitation 50 percent. Precipitation mostly around a quarter of an inch. |
| Saturday |
Sunny. Moderate fog in the morning. High 77°. UV index up to 7. Wind west-southwest around 7 mph, gusting to 26 mph. |
| Saturday night |
Fair to partly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. A chance of rain after midnight. Low 52°. Wind west-southwest around 6 mph, gusting to 17 mph, in the evening, becoming north-northwest after midnight. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday |
Mostly cloudy. Patchy light fog in the morning. A chance of rain in the morning, then a slight chance of rain in the afternoon. High 67°. UV index up to 5. Wind north-northeast around 7 mph, gusting to 25 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Sunday night |
Clear. Cool. Low 46°. Wind north-northeast around 3 mph, gusting to 21 mph. |
| Monday |
Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 72°. UV index up to 6. Wind west-northwest around 4 mph, gusting to 26 mph. |
| Monday night |
Mostly clear in the evening, becoming partly to mostly cloudy after midnight. Cool. Low 50°. Wind south around 5 mph, gusting to 17 mph. |
| Tuesday |
Mostly cloudy in the morning, becoming partly cloudy in the afternoon. Rain likely. High 74°. UV index up to 7. Wind south-southwest around 8 mph, gusting to 22 mph, in the morning, becoming 12 mph, gusting to 27 mph, in the afternoon. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Tuesday night |
Partly cloudy in the evening, becoming clear after midnight. Patchy light fog after midnight. Low 55°. Wind west-southwest around 8 mph, gusting to 25 mph. |
| Wednesday |
Mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. Breezy. High 67°. UV index up to 7. Wind northwest around 13 mph, gusting to 32 mph. |
| Wednesday night |
Clear. Cool. Low 46°. Wind north around 7 mph, gusting to 26 mph, in the evening, becoming 4 mph after midnight. |
WXSIM forecast formatting script by Saratoga-Weather.org.