| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Saturday, 25-Apr-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Fair to partly cloudy in the evening, becoming fair after midnight. Patchy light fog after midnight. Low 51°. Wind east around 5 mph, gusting to 23 mph. |
| Sunday |
Partly to mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. Warm. High 79°. UV index up to 7. Wind east around 7 mph, gusting to 26 mph, in the morning, becoming southeast in the afternoon. |
| Sunday night |
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Scattered thundershowers possible. Low 60°. Wind southeast around 8 mph, gusting to 22 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Monday |
Partly cloudy in the morning, becoming mostly cloudy in the afternoon. Patchy light fog in the morning. A slight chance of rain in the morning, then rain likely in the afternoon. Thunderstorms very likely, some severe. Breezy and warm. High 81°. UV index up to 6. Wind south-southeast around 12 mph, gusting to 29 mph, in the morning, becoming 16 mph, gusting to 32 mph, in the afternoon. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Monday night |
Fair in the evening, becoming partly cloudy after midnight. Light to moderate fog. A chance of rain. Scattered thunderstorms likely, some possibly severe. Low 59°. Wind southwest around 11 mph, gusting to 25 mph, in the evening, becoming west-northwest around 7 mph, gusting to 20 mph, after midnight. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Tuesday |
Partly cloudy in the morning, becoming mostly sunny in the afternoon. Patchy light fog in the morning. Warm. High 76°. UV index up to 7. Wind west-northwest around 4 mph, gusting to 26 mph. |
| Tuesday night |
Mostly cloudy to cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Scattered thundershowers possible. Low 54°. Wind north-northeast around 7 mph, gusting to 21 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday |
Sunny in the morning, becoming partly to mostly sunny in the afternoon. Patchy light fog in the morning. High 67°. UV index up to 7. Wind north-northwest around 10 mph, gusting to 28 mph. |
| Wednesday night |
Fair to partly cloudy in the evening, becoming clear after midnight. Cool. Low 45°. Wind north-northwest around 7 mph, gusting to 25 mph, in the evening, becoming 3 mph after midnight. |
| Thursday |
Partly to mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. High 67°. UV index up to 6. Wind north-northwest around 3 mph, gusting to 23 mph, in the morning, becoming 6 mph, gusting to 24 mph, in the afternoon. |
| Thursday night |
Mostly cloudy. Low 49°. Wind north around 4 mph, gusting to 20 mph, in the evening, becoming northwest after midnight. |
| Friday |
Partly cloudy in the morning, becoming cloudy in the afternoon. High 68°. UV index up to 7. Wind west around 7 mph, gusting to 26 mph. |
| Friday night |
Cloudy in the evening, becoming mostly cloudy to cloudy after midnight. A slight chance of rain. Precipitation showery or intermittent. Cool. Low 47°. Wind north around 7 mph, gusting to 21 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
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