| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Tuesday, 16-Jun-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Partly to mostly cloudy. High 81°. UV index up to 7. Wind west-southwest around 10 mph, gusting to 28 mph. |
| Tonight |
Fair to partly cloudy. Patchy light fog after midnight. Relatively cool. Low 62°. Wind southwest around 5 mph, gusting to 24 mph. |
| Wednesday |
Partly cloudy in the morning, becoming partly to mostly sunny 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. Scattered thundershowers possible. Breezy and hot. High 91°. UV index up to 9. Wind south-southwest around 8 mph, gusting to 28 mph, in the morning, becoming 17 mph, gusting to 33 mph, in the afternoon. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Wednesday night |
Fair to partly cloudy in the evening, becoming clear after midnight. Moderate fog in the evening, then moderate to dense fog after midnight. A chance of rain. Scattered thundershowers possible. Low 69°. Wind southwest around 10 mph, gusting to 22 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Thursday |
Partly to mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. Moderate fog in the morning. High 85°. UV index up to 8. Wind northwest around 7 mph, gusting to 26 mph. |
| Thursday night |
Partly cloudy in the evening, becoming mostly clear after midnight. Patchy light fog after midnight. Relatively cool. Low 63°. Wind north-northwest around 3 mph, gusting to 22 mph. |
| Friday |
Partly cloudy. Patchy light fog in the morning. High 83°. UV index up to 8. Wind north-northwest around 4 mph, gusting to 23 mph. |
| Friday night |
Clear. Light to moderate fog after midnight. Relatively cool. Low 63°. Wind east-southeast around 5 mph, gusting to 18 mph, in the evening, becoming south after midnight. |
| Saturday |
Sunny in the morning, becoming partly to mostly sunny in the afternoon. Light to moderate fog in the morning. A slight chance of rain. High 87°. UV index up to 9. Wind south around 5 mph, gusting to 23 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday night |
Partly to mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Light to moderate fog in the evening, then moderate fog after midnight. A chance of rain in the evening, then rain likely after midnight. Scattered thundershowers possible. Low 69°. Wind southeast around 4 mph, gusting to 18 mph, in the evening, becoming 7 mph after midnight. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch. |
| Sunday |
Dense overcast in the morning, becoming mostly cloudy to cloudy in the afternoon. Light to moderate fog. Rain very likely. Scattered thunderstorms likely. High 75°. UV index up to 5. Wind south-southeast around 8 mph, gusting to 18 mph, in the morning, becoming southwest in the afternoon. Chance of precipitation 80 percent. Precipitation mostly between 1 and 2 inches. |
| Sunday night |
Mostly cloudy to cloudy in the evening, becoming dense overcast after midnight. Moderate fog in the evening, then light to moderate fog after midnight. Rain likely in the evening, then a chance of rain after midnight. Scattered thundershowers possible. Low 69°. Wind northeast around 8 mph, gusting to 21 mph. Chance of precipitation 80 percent. Precipitation mostly between half an inch and one inch. |
| Monday |
Dense overcast in the morning, becoming cloudy in the afternoon. Patchy light fog in the morning. A chance of rain in the morning, then a slight chance of rain in the afternoon. Precipitation showery or intermittent. Relatively cool. High 75°. UV index up to 4. Wind northeast around 7 mph, gusting to 24 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Monday night |
Cloudy. Patchy light fog after midnight. A chance of rain. Precipitation showery or intermittent. Low 66°. Wind east-northeast around 4 mph, gusting to 21 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
WXSIM forecast formatting script by Saratoga-Weather.org.
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