| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Tuesday, 07-Apr-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Cool. Low 41°. Wind east-southeast around 7 mph, gusting to 24 mph. |
| Wednesday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Mild. High 71°. UV index up to 5. Wind south-southeast around 10 mph, gusting to 29 mph. |
| Wednesday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 47°. Wind south-southwest around 8 mph, gusting to 22 mph. |
| Thursday |
Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Warm. High 75°. UV index up to 5. Wind south-southwest around 7 mph, gusting to 24 mph. |
| Thursday night |
Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Low 52°. Wind south-southwest around 5 mph, gusting to 15 mph, in the evening, becoming 9 mph after midnight. |
| Friday |
Mostly cloudy to cloudy in the morning, becoming dense overcast in the afternoon. Patchy light fog in the afternoon. A chance of rain in the morning, then rain likely in the afternoon. Scattered thundershowers possible. High 65°. Wind southwest around 6 mph, gusting to 15 mph, in the morning, becoming northwest in the afternoon. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch. |
| Friday night |
Dense overcast in the evening, becoming cloudy after midnight. Patchy light fog. Rain likely. Precipitation showery or intermittent. Low 51°. Wind northeast around 3 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Saturday |
Cloudy in the morning, becoming mostly cloudy to 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. Scattered thundershowers possible. High 65°. Wind east-southeast around 6 mph, gusting to 17 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Saturday night |
Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 50°. Wind southeast around 7 mph, gusting to 16 mph. |
| Sunday |
Partly to mostly sunny in the morning, becoming mostly cloudy in the afternoon. Breezy and warm. High 79°. UV index up to 7. Wind southeast around 9 mph, gusting to 25 mph, in the morning, becoming south around 13 mph, gusting to 30 mph, in the afternoon. |
| Sunday night |
Mostly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. A chance of rain. Scattered thundershowers possible. Breezy. Low 59°. Wind south around 12 mph, gusting to 23 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Monday |
Mostly sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. Breezy and unusually warm. High 81°. UV index up to 7. Wind south around 15 mph, gusting to 32 mph. |
| Monday night |
Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. Breezy and mild. Low 62°. Wind south-southwest around 13 mph, gusting to 26 mph. |
WXSIM forecast formatting script by Saratoga-Weather.org.