| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Monday, 04-May-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Mostly cloudy in the morning, becoming partly cloudy in the afternoon. A chance of rain. Scattered thunderstorms likely. Warm. High 82°. UV index up to 6. Wind south-southwest around 5 mph, gusting to 26 mph, in the morning, becoming 11 mph, gusting to 29 mph, in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Tonight |
Partly cloudy in the evening, becoming mostly cloudy after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Thunderstorms very likely, some possibly severe. Low 61°. Wind southwest around 10 mph, gusting to 27 mph, in the evening, becoming 7 mph, gusting to 17 mph, after midnight. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday |
Cloudy. Rain likely. Thunderstorms very likely, some possibly severe. High 68°. UV index up to 5. Wind north around 8 mph, gusting to 28 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Tuesday night |
Cloudy. Light to moderate fog in the evening, then patchy light fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Low 52°. Wind north around 7 mph, gusting to 25 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Wednesday |
Cloudy in the morning, becoming partly to mostly cloudy in the afternoon. A slight chance of rain. Cool. High 61°. UV index up to 5. Wind north around 7 mph, gusting to 26 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday night |
Mostly cloudy in the evening, becoming partly cloudy after midnight. Cool. Low 43°. Wind north around 4 mph, gusting to 24 mph, in the evening, becoming northwest after midnight. |
| Thursday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. High 64°. UV index up to 6. Wind west around 4 mph, gusting to 25 mph, in the morning, becoming 9 mph, gusting to 26 mph, in the afternoon. |
| Thursday night |
Clear in the evening, becoming fair to partly cloudy after midnight. Cool. Low 45°. Wind southwest around 6 mph, gusting to 21 mph. |
| Friday |
Mostly cloudy. High 69°. UV index up to 4. Wind southwest around 7 mph, gusting to 23 mph. |
| Friday night |
Partly cloudy in the evening, becoming clear after midnight. Cool. Low 48°. Wind southwest around 5 mph, gusting to 20 mph. |
| Saturday |
Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 78°. UV index up to 7. Wind southwest around 6 mph, gusting to 25 mph. |
| Saturday night |
Mostly cloudy in the evening, becoming fair to partly cloudy after midnight. Patchy light fog after midnight. Low 55°. Wind southeast around 5 mph, gusting to 18 mph. |
| Sunday |
Partly cloudy in the morning, becoming dense overcast in the afternoon. Light to moderate fog in the morning. A chance of rain in the afternoon. Scattered thundershowers possible. High 72°. UV index up to 6. Wind east-southeast around 7 mph, gusting to 24 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Sunday night |
Partly to mostly cloudy in the evening, becoming dense overcast after midnight. Patchy light fog. A slight chance of rain in the evening, then a chance of rain after midnight. Scattered thunderstorms likely. Low 58°. Wind east around 4 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
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