| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Saturday, 04-Jul-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Partly cloudy. Light to moderate fog in the evening, then moderate fog after midnight. Rain likely. Scattered thunderstorms likely. Low 73°. Wind west-northwest around 3 mph, gusting to 18 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch. |
| Sunday |
Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Light to moderate fog in the morning. A slight chance of rain in the morning, then a chance of rain in the afternoon. Thunderstorms very likely, some possibly severe. High 89°. Heat index up to 96°. UV index up to 7. Wind north-northwest around 3 mph, gusting to 21 mph. Chance of precipitation 50 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday night |
Fair to partly cloudy in the evening, becoming fair after midnight. Light to moderate fog in the evening, then moderate fog after midnight. A slight chance of rain. Scattered thunderstorms likely. Low 70°. Wind north-northwest around 4 mph, gusting to 18 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Monday |
Partly to mostly sunny. Light to moderate fog in the morning. High 89°. Heat index up to 94°. UV index up to 9. Wind north-northeast around 6 mph, gusting to 25 mph. |
| Monday night |
Mostly clear. Patchy light fog after midnight. Low 68°. Wind north-northeast around 4 mph, gusting to 21 mph. |
| Tuesday |
Partly to mostly sunny in the morning, becoming sunny in the afternoon. Patchy light fog in the morning. Hot. High 90°. Heat index up to 94°. UV index up to 9. Wind north-northeast around 3 mph, gusting to 23 mph. |
| Tuesday night |
Clear in the evening, becoming fair after midnight. Patchy light fog after midnight. Relatively cool. Low 67°. Wind northeast around 2 mph, gusting to 19 mph, in the evening, becoming south-southwest after midnight. |
| Wednesday |
Mostly sunny. Patchy light fog in the morning. Hot. High 93°. Heat index up to 98°. UV index up to 9. Wind southwest around 3 mph, gusting to 22 mph. |
| Wednesday night |
Clear in the evening, becoming mostly clear after midnight. Low 69°. Wind south around 5 mph, gusting to 18 mph. |
| Thursday |
Partly cloudy. A chance of rain. Scattered thundershowers possible. Hot. High 91°. Heat index up to 100°. UV index up to 8. Wind southwest around 5 mph, gusting to 23 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Thursday night |
Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. Patchy light fog. Rain likely. Scattered thunderstorms likely. Low 74°. Wind west-southwest around 3 mph, gusting to 18 mph. Chance of precipitation 60 percent. Precipitation mostly around a tenth of an inch. |
| Friday |
Mostly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Patchy light fog in the morning. A slight chance of rain. Precipitation showery or intermittent. Hot. High 94°. Heat index up to 103°. UV index up to 10. Wind west-southwest around 8 mph, gusting to 24 mph, in the morning, becoming 12 mph, gusting to 29 mph, in the afternoon. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Friday night |
Partly to mostly cloudy. Low 71°. Wind west-northwest around 7 mph, gusting to 25 mph, in the evening, becoming 4 mph after midnight. |
WXSIM forecast formatting script by Saratoga-Weather.org.
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