| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Sunday, 19-Apr-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Sunny. High 63°. UV index up to 7. Wind west-southwest around 6 mph, gusting to 28 mph, in the morning, becoming west-northwest around 12 mph, gusting to 28 mph, in the afternoon. |
| Tonight |
Mostly clear in the evening, becoming fair after midnight. Cool. Low 40°. Wind north around 4 mph, gusting to 23 mph, in the evening, becoming northeast after midnight. |
| Monday |
Sunny. High 69°. UV index up to 7. Wind southeast around 6 mph, gusting to 26 mph. |
| Monday night |
Fair in the evening, becoming partly cloudy after midnight. Low 46°. Wind south around 6 mph, gusting to 22 mph. |
| Tuesday |
Partly cloudy in the morning, becoming sunny in the afternoon. Warm. High 78°. UV index up to 7. Wind south-southwest around 9 mph, gusting to 29 mph, in the morning, becoming 12 mph, gusting to 30 mph, in the afternoon. |
| Tuesday night |
Clear in the evening, becoming mostly clear after midnight. Low 50°. Wind south-southwest around 8 mph, gusting to 25 mph. |
| Wednesday |
Mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. Warm. High 79°. UV index up to 6. Wind southwest around 7 mph, gusting to 26 mph. |
| Wednesday night |
Partly cloudy in the evening, becoming mostly clear after midnight. Low 52°. Wind south-southwest around 6 mph, gusting to 19 mph. |
| Thursday |
Partly to mostly cloudy in the morning, becoming mostly cloudy in the afternoon. Breezy and warm. High 81°. UV index up to 5. Wind south around 9 mph, gusting to 27 mph, in the morning, becoming 14 mph, gusting to 30 mph, in the afternoon. |
| Thursday night |
Mostly cloudy to 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. Severe thunderstorms likely, with possible tornados. Low 61°. Wind south around 9 mph, gusting to 26 mph. Chance of precipitation 80 percent. Precipitation mostly around half an inch. |
| Friday |
Partly to mostly cloudy in the morning, becoming sunny in the afternoon. Light to moderate fog in the morning. A chance of rain. Thunderstorms very likely, some possibly severe. Warm. High 75°. UV index up to 7. Wind northwest around 7 mph, gusting to 26 mph. Chance of precipitation 50 percent. Precipitation mostly around a quarter of an inch. |
| Friday night |
Mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Low 56°. Wind north-northeast around 6 mph, gusting to 23 mph. |
| Saturday |
Cloudy in the morning, becoming mostly cloudy in the afternoon. High 70°. UV index up to 8. Wind north-northeast around 8 mph, gusting to 27 mph. |
| Saturday night |
Partly cloudy in the evening, becoming fair after midnight. Low 50°. Wind north-northeast around 6 mph, gusting to 23 mph. |
WXSIM forecast formatting script by Saratoga-Weather.org.