| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
||||||||||||||||||||||||||||||||||||||||||||||||
| Updated: Monday, 25-May-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
|
| Today |
Sunny. High 83°. UV index up to 8. Wind east-southeast around 4 mph, gusting to 24 mph. |
| Tonight |
Partly cloudy. Relatively cool. Low 57°. Wind east-southeast around 3 mph, gusting to 19 mph. |
| Tuesday |
Partly to mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. High 81°. UV index up to 6. Wind east around 4 mph, gusting to 23 mph. |
| Tuesday night |
Mostly cloudy to cloudy in the evening, becoming partly to mostly cloudy after midnight. Moderate fog after midnight. A slight chance of rain in the evening, then rain likely after midnight. Scattered thunderstorms likely. Low 62°. Wind east-northeast around 4 mph, gusting to 18 mph, in the evening, becoming north after midnight. Chance of precipitation 70 percent. Precipitation mostly around half an inch. |
| Wednesday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Moderate to dense fog in the morning, then moderate fog in the afternoon. Rain likely. Precipitation showery or intermittent. High 72°. UV index up to 7. Wind north-northwest around 5 mph, gusting to 18 mph. Chance of precipitation 70 percent. Precipitation mostly between half an inch and one inch. |
| Wednesday night |
Partly cloudy. Light to moderate fog. A chance of rain. Low 61°. Wind east-northeast around 3 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday |
Partly cloudy in the morning, becoming mostly cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. High 79°. UV index up to 8. Wind northeast around 7 mph, gusting to 24 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday night |
Partly to mostly cloudy. Patchy light fog after midnight. Low 60°. Wind northeast around 6 mph, gusting to 18 mph. |
| Friday |
Partly to mostly cloudy. Patchy light fog in the morning. High 78°. UV index up to 8. Wind east-northeast around 6 mph, gusting to 24 mph. |
| Friday night |
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog after midnight. Low 59°. Wind east-northeast around 4 mph, gusting to 21 mph. |
| Saturday |
Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. High 78°. UV index up to 9. Wind northeast around 7 mph, gusting to 26 mph. |
| Saturday night |
Partly cloudy in the evening, becoming clear after midnight. Relatively cool. Low 56°. Wind northeast around 8 mph, gusting to 22 mph. |
| Sunday |
Sunny. Breezy. High 70°. UV index up to 10. Wind northeast around 11 mph, gusting to 30 mph. |
| Sunday night |
Clear. Cool. Low 53°. Wind northeast around 6 mph, gusting to 25 mph. |
WXSIM forecast formatting script by Saratoga-Weather.org.