| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
||||||||||||||||||||||||||||||||||||||||||||||||
| Updated: Thursday, 11-Jun-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
|
| Tonight |
Partly to mostly cloudy in the evening, becoming fair after midnight. Patchy light fog in the evening, then moderate fog after midnight. Rain likely in the evening, then a slight chance of rain after midnight. Thunderstorms very likely, some possibly severe. Low 70°. Wind west around 11 mph, gusting to 27 mph, in the evening, becoming 5 mph, gusting to 18 mph, after midnight. Chance of precipitation 60 percent. Precipitation mostly around a tenth of an inch. |
| Friday |
Sunny. Light to moderate fog in the morning. High 86°. UV index up to 10. Wind west-northwest around 5 mph, gusting to 24 mph. |
| Friday night |
Fair in the evening, becoming partly cloudy after midnight. Light to moderate fog after midnight. A chance of rain after midnight. Low 68°. Wind south-southwest around 3 mph, gusting to 19 mph, in the evening, becoming south-southeast after midnight. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday |
Mostly cloudy. Light to moderate fog in the morning. A chance of rain in the morning, then rain likely in the afternoon. Thunderstorms very likely, some possibly severe. High 84°. UV index up to 6. Wind south-southwest around 8 mph, gusting to 25 mph. Chance of precipitation 70 percent. Precipitation mostly around a quarter of an inch. |
| Saturday night |
Partly to mostly cloudy in the evening, becoming cloudy after midnight. Light to moderate fog. Rain very likely. Thunderstorms very likely, some severe. Low 70°. Wind south-southwest around 6 mph, gusting to 22 mph, in the evening, becoming west after midnight. Chance of precipitation 90 percent. Precipitation mostly around half an inch. |
| Sunday |
Mostly cloudy in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. Breezy. High 77°. UV index up to 9. Wind north-northwest around 11 mph, gusting to 29 mph. |
| Sunday night |
Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. Relatively cool. Low 62°. Wind north-northwest around 5 mph, gusting to 26 mph, in the evening, becoming west-northwest after midnight. |
| Monday |
Partly cloudy. High 80°. UV index up to 8. Wind west-northwest around 5 mph, gusting to 25 mph. |
| Monday night |
Partly cloudy. Relatively cool. Low 61°. Wind east-northeast around 3 mph, gusting to 20 mph, in the evening, becoming west-southwest after midnight. |
| Tuesday |
Partly to mostly sunny. High 83°. UV index up to 8. Wind west-southwest around 5 mph, gusting to 24 mph. |
| Tuesday night |
Partly cloudy. A chance of rain in the evening, then a slight chance of rain after midnight. Scattered thunderstorms likely. Relatively cool. Low 63°. Wind west-southwest around 6 mph, gusting to 21 mph, in the evening, becoming south-southwest after midnight. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday |
Partly to mostly cloudy. Rain likely. Thunderstorms very likely, some possibly severe. Breezy. High 87°. UV index up to 10. Wind south-southwest around 12 mph, gusting to 31 mph, in the morning, becoming 16 mph, gusting to 32 mph, in the afternoon. Chance of precipitation 60 percent. Precipitation mostly around a tenth of an inch. |
| Wednesday night |
Fair in the evening, becoming fair to partly cloudy after midnight. Moderate fog. A chance of rain in the evening, then a slight chance of rain after midnight. Scattered thunderstorms likely. Low 67°. Wind west around 11 mph, gusting to 25 mph, in the evening, becoming 7 mph after midnight. Chance of precipitation 60 percent. Precipitation mostly less than a tenth of an inch. |
WXSIM forecast formatting script by Saratoga-Weather.org.
Powered by Davis Vantage Pro2
and
CumulusMX
v 4.6.4 (b4128)
MXUI Template v 2.2.6 by
Silver Acorn
Valid HTML5