| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Sunday, 24-May-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Clear. Patchy light fog after midnight. Low 58°. Wind north-northeast around 2 mph, gusting to 22 mph, in the evening, becoming east after midnight. |
| Monday |
Sunny. Patchy light fog in the morning. High 81°. UV index up to 8. Wind east around 4 mph, gusting to 23 mph. |
| Monday night |
Clear. Patchy light fog after midnight. Low 58°. Wind east-southeast around 3 mph, gusting to 20 mph. |
| Tuesday |
Partly to mostly sunny in the morning, becoming mostly cloudy in the afternoon. Patchy light fog in the morning. High 82°. UV index up to 7. Wind southeast around 5 mph, gusting to 24 mph. |
| Tuesday night |
Cloudy in the evening, becoming dense overcast after midnight. Patchy light fog after midnight. A chance of rain in the evening, then rain likely after midnight. Scattered thunderstorms likely. Low 67°. Wind southeast around 4 mph, gusting to 20 mph. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch. |
| Wednesday |
Cloudy in the morning, becoming mostly cloudy in the afternoon. Light to moderate fog in the morning, then patchy light fog in the afternoon. Rain likely. Scattered thunderstorms likely. High 74°. UV index up to 5. Wind east around 4 mph, gusting to 18 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Wednesday night |
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. A slight chance of rain in the evening. Precipitation showery or intermittent. Low 65°. Wind northeast around 4 mph, gusting to 17 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday |
Mostly cloudy to cloudy in the morning, becoming cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. Scattered thundershowers possible. High 77°. UV index up to 5. Wind east-northeast around 6 mph, gusting to 20 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday night |
Cloudy in the evening, becoming dense overcast after midnight. A chance of rain. Scattered thundershowers possible. Low 65°. Wind east around 5 mph, gusting to 17 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Friday |
Dense overcast. A chance of rain. Scattered thundershowers possible. High 73°. UV index up to 4. Wind east around 5 mph, gusting to 17 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Friday night |
Cloudy. Patchy light fog. A chance of rain. Scattered thundershowers possible. Low 65°. Wind east around 5 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch. |
| Saturday |
Dense overcast in the morning, becoming partly to mostly sunny in the afternoon. Patchy light fog in the morning. A chance of rain. Scattered thundershowers possible. High 74°. UV index up to 9. Wind northeast around 7 mph, gusting to 26 mph, in the morning, becoming 11 mph, gusting to 29 mph, in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday night |
Fair to partly cloudy in the evening, becoming clear after midnight. Relatively cool. Low 56°. Wind northeast around 8 mph, gusting to 27 mph. |
WXSIM forecast formatting script by Saratoga-Weather.org.
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