| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Thursday, 23-Apr-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Partly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Light to moderate fog after midnight. A slight chance of rain in the evening, then rain likely after midnight. Scattered thunderstorms likely. Low 63°. Wind south around 12 mph, gusting to 29 mph, in the evening, becoming 8 mph, gusting to 18 mph, after midnight. Chance of precipitation 80 percent. Precipitation mostly around half an inch. |
| Friday |
Mostly cloudy to cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Light to moderate fog in the morning. A chance of rain in the morning, then a slight chance of rain in the afternoon. Thunderstorms very likely, some possibly severe. High 74°. UV index up to 5. Wind west-southwest around 7 mph, gusting to 24 mph, in the morning, becoming west-northwest in the afternoon. Chance of precipitation 50 percent. Precipitation mostly less than a tenth of an inch. |
| Friday night |
Fair to partly cloudy in the evening, becoming clear after midnight. Patchy light fog after midnight. Low 52°. Wind north around 5 mph, gusting to 22 mph. |
| Saturday |
Sunny in the morning, becoming partly to mostly sunny in the afternoon. Patchy light fog in the morning. High 75°. UV index up to 6. Wind northeast around 6 mph, gusting to 23 mph. |
| Saturday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 51°. Wind northeast around 6 mph, gusting to 17 mph. |
| Sunday |
Mostly sunny in the morning, becoming partly cloudy in the afternoon. Warm. High 76°. UV index up to 7. Wind east around 8 mph, gusting to 26 mph. |
| Sunday night |
Partly cloudy. Patchy light fog after midnight. A slight chance of rain. Low 55°. Wind east-southeast around 9 mph, gusting to 23 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Monday |
Mostly cloudy. Patchy light fog in the morning. Rain likely. Thunderstorms very likely, some severe. Breezy. High 75°. UV index up to 4. Wind south around 13 mph, gusting to 26 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Monday night |
Mostly clear in the evening, becoming fair to partly cloudy after midnight. Patchy light fog. A chance of rain. Scattered thunderstorms likely. Low 57°. Wind west-southwest around 9 mph, gusting to 20 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday |
Partly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Patchy light fog in the morning. High 72°. UV index up to 5. Wind west-northwest around 6 mph, gusting to 27 mph. |
| Tuesday night |
Fair to partly cloudy. Light to moderate fog after midnight. A chance of rain. Low 51°. Wind north-northwest around 4 mph, gusting to 18 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday |
Sunny. Patchy light fog in the morning. High 72°. UV index up to 9. Wind northwest around 4 mph, gusting to 24 mph, in the morning, becoming southwest in the afternoon. |
| Wednesday night |
Fair in the evening, becoming fair to partly cloudy after midnight. Patchy light fog after midnight. Low 53°. Wind south-southwest around 5 mph, gusting to 19 mph. |
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