| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Thursday, 07-May-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Fair to partly cloudy in the evening, becoming fair after midnight. Cool. Low 49°. Wind west-southwest around 5 mph, gusting to 26 mph. |
| Friday |
Partly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. High 75°. UV index up to 6. Wind west-southwest around 7 mph, gusting to 26 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Friday night |
Cloudy in the evening, becoming fair to partly cloudy after midnight. Patchy light fog in the evening, then moderate to dense fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Low 55°. Wind west around 4 mph, gusting to 18 mph, in the evening, becoming southwest after midnight. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Saturday |
Mostly sunny in the morning, becoming sunny in the afternoon. Moderate fog in the morning. High 78°. 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 cloudy after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Low 57°. Wind west-southwest around 5 mph, gusting to 19 mph, in the evening, becoming northwest after midnight. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday |
Mostly cloudy to cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. A chance of rain in the morning, then a slight chance of rain in the afternoon. High 70°. UV index up to 5. Wind north-northeast around 7 mph, gusting to 26 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Sunday night |
Clear in the evening, becoming fair to partly cloudy after midnight. Cool. Low 49°. Wind north around 3 mph, gusting to 22 mph, in the evening, becoming east-northeast after midnight. |
| Monday |
Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 72°. UV index up to 7. Wind south-southwest around 2 mph, gusting to 28 mph, in the morning, becoming west around 5 mph, gusting to 24 mph, in the afternoon. |
| Monday night |
Fair. Cool. Low 49°. Wind south around 4 mph, gusting to 18 mph. |
| Tuesday |
Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. A chance of rain. High 73°. UV index up to 7. Wind south-southwest around 8 mph, gusting to 23 mph, in the morning, becoming 11 mph, gusting to 28 mph, in the afternoon. Chance of precipitation 50 percent. Precipitation mostly around a quarter of an inch. |
| Tuesday night |
Partly cloudy in the evening, becoming clear after midnight. Patchy light fog. Low 53°. Wind west-southwest around 8 mph, gusting to 22 mph, in the evening, becoming northwest after midnight. |
| Wednesday |
Mostly sunny. Patchy light fog in the morning. Breezy. High 69°. UV index up to 9. Wind northwest around 11 mph, gusting to 30 mph. |
| Wednesday night |
Partly cloudy in the evening, becoming clear after midnight. Cool. Low 47°. Wind north-northwest around 5 mph, gusting to 23 mph, in the evening, becoming south-southeast around 2 mph after midnight. |
WXSIM forecast formatting script by Saratoga-Weather.org.
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