| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Friday, 01-May-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Fair to partly cloudy in the evening, becoming clear after midnight. Cool. Low 42°. Wind west-northwest around 3 mph, gusting to 22 mph. |
| Saturday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Cool. High 61°. UV index up to 5. Wind north-northwest around 8 mph, gusting to 27 mph. |
| Saturday night |
Clear. Unusually cold. Low 40°. Wind northwest around 4 mph, gusting to 23 mph, in the evening, becoming south-southwest after midnight. |
| Sunday |
Mostly sunny in the morning, becoming partly cloudy in the afternoon. High 70°. UV index up to 6. Wind south-southwest around 9 mph, gusting to 27 mph, in the morning, becoming 12 mph, gusting to 29 mph, in the afternoon. |
| Sunday night |
Partly cloudy. Light to moderate fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Scattered thundershowers possible. Low 51°. Wind west-southwest around 7 mph, gusting to 21 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Monday |
Partly to mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. A slight chance of rain in the afternoon. Scattered thunderstorms likely, some possibly severe. High 76°. UV index up to 5. Wind west-southwest around 9 mph, gusting to 27 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Monday night |
Partly to mostly cloudy in the evening, becoming dense overcast after midnight. Light to moderate fog. Rain very likely. Thunderstorms very likely, some severe. Low 58°. Wind southwest around 5 mph, gusting to 19 mph. Chance of precipitation 80 percent. Precipitation mostly around an inch. |
| Tuesday |
Dense overcast. Light to moderate fog in the morning, then patchy light fog in the afternoon. A chance of rain in the morning, then rain likely in the afternoon. Thunderstorms very likely, some possibly severe. High 62°, but temperatures falling in the afternoon. Wind north-northeast around 5 mph, gusting to 18 mph, in the morning, becoming 8 mph, gusting to 24 mph, in the afternoon. Chance of precipitation 80 percent. Precipitation mostly around half an inch. |
| Tuesday night |
Dense overcast in the evening, becoming mostly cloudy to cloudy after midnight. Patchy light fog. Rain likely in the evening, then a chance of rain after midnight. Precipitation showery or intermittent. Cool. Low 49°. Wind north-northeast around 8 mph, gusting to 24 mph. Chance of precipitation 70 percent. Precipitation mostly around half an inch. |
| Wednesday |
Mostly cloudy to cloudy in the morning, becoming cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. Cool. High 58°. Wind north-northeast around 9 mph, gusting to 26 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Wednesday night |
Cloudy in the evening, becoming partly cloudy after midnight. A chance of rain. Cool. Low 43°. Wind north-northwest around 6 mph, gusting to 23 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday |
Partly cloudy. A slight chance of rain. Cool. High 61°. UV index up to 9. Wind west-northwest around 9 mph, gusting to 27 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday night |
Mostly cloudy in the evening, becoming dense overcast after midnight. Patchy light fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Cool. Low 48°. Wind west-southwest around 3 mph, gusting to 17 mph, in the evening, becoming south-southeast after midnight. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch. |
WXSIM forecast formatting script by Saratoga-Weather.org.
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