| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
||||||||||||||||||||||||||||||||||||||||||||||||
| Updated: Friday, 08-May-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
|
| Today |
Mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. High 74°. UV index up to 6. Wind southwest around 8 mph, gusting to 26 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Tonight |
Cloudy in the evening, becoming fair after midnight. Patchy light fog in the evening, then moderate fog after midnight. A chance of rain. Low 53°. Wind west around 5 mph, gusting to 17 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday |
Mostly sunny. Moderate fog in the morning. High 78°. UV index up to 7. Wind west around 8 mph, gusting to 26 mph. |
| Saturday night |
Partly to mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Low 54°. Wind west around 6 mph, gusting to 20 mph, in the evening, becoming north after midnight. |
| Sunday |
Mostly cloudy to cloudy in the morning, becoming mostly cloudy in the afternoon. A chance of rain. High 68°. UV index up to 6. Wind north-northeast around 8 mph, gusting to 27 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday night |
Fair in the evening, becoming clear after midnight. Cool. Low 45°. Wind north-northwest around 3 mph, gusting to 23 mph. |
| Monday |
Sunny in the morning, becoming partly cloudy in the afternoon. High 73°. UV index up to 7. Wind west-southwest around 5 mph, gusting to 24 mph. |
| Monday night |
Fair to partly cloudy in the evening, becoming clear after midnight. Patchy light fog after midnight. Cool. Low 49°. Wind southwest around 4 mph, gusting to 20 mph. |
| Tuesday |
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 a chance of rain in the afternoon. High 75°. UV index up to 5. Wind south-southwest around 9 mph, gusting to 26 mph. Chance of precipitation 40 percent. Precipitation mostly less than a quarter of an inch. |
| Tuesday night |
Fair to partly cloudy in the evening, becoming clear after midnight. Patchy light fog after midnight. Low 54°. Wind west-southwest around 8 mph, gusting to 20 mph. |
| Wednesday |
Partly to mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. Breezy. High 66°. UV index up to 5. Wind north-northwest around 11 mph, gusting to 29 mph. |
| Wednesday night |
Fair in the evening, becoming partly to mostly cloudy after midnight. Cool. Low 46°. Wind north-northwest around 5 mph, gusting to 25 mph. |
| Thursday |
Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. High 73°. UV index up to 9. Wind east around 5 mph, gusting to 26 mph. |
| Thursday night |
Mostly cloudy to cloudy in the evening, becoming partly to mostly cloudy after midnight. A chance of rain. Cool. Low 52°. Wind east around 7 mph, gusting to 23 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
WXSIM forecast formatting script by Saratoga-Weather.org.