| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Saturday, 02-May-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Partly to mostly sunny. High 63°. UV index up to 6. Wind north-northwest around 5 mph, gusting to 23 mph. |
| Tonight |
Clear. Cool. Low 42°. Wind west-southwest around 2 mph, gusting to 20 mph, in the evening, becoming south-southeast around 5 mph after midnight. |
| Sunday |
Partly to mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. High 72°. UV index up to 6. Wind south-southwest around 10 mph, gusting to 29 mph. |
| Sunday night |
Mostly cloudy in the evening, becoming partly cloudy after midnight. Moderate fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Scattered thundershowers possible. Low 53°. Wind west-southwest around 4 mph, gusting to 21 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth 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 chance of rain. Scattered thunderstorms likely. High 76°. UV index up to 5. Wind south-southwest around 10 mph, gusting to 27 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Monday night |
Partly cloudy in the evening, becoming cloudy after midnight. Patchy light fog after midnight. A chance of rain. Thunderstorms very likely, some possibly severe. Low 58°. Wind south-southwest around 6 mph, gusting to 19 mph, in the evening, becoming 3 mph after midnight. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday |
Dense overcast. Patchy light fog. A chance of rain in the morning, then rain likely in the afternoon. Scattered thunderstorms likely. High 61°, but temperatures falling in the afternoon. Wind north-northwest around 8 mph, gusting to 25 mph. Chance of precipitation 80 percent. Precipitation mostly between half an inch and one inch. |
| Tuesday night |
Cloudy. Patchy light fog. A chance of rain. Cool. Low 49°. Wind north-northwest around 7 mph, gusting to 24 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Wednesday |
Mostly cloudy in the morning, becoming cloudy in the afternoon. A slight chance of rain. Cool. High 60°. UV index up to 5. Wind north-northeast around 8 mph, gusting to 25 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday night |
Cloudy in the evening, becoming mostly cloudy to cloudy after midnight. A chance of rain. Cool. Low 43°. Wind north around 8 mph, gusting to 25 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Cool. High 61°. UV index up to 6. Wind west-northwest around 10 mph, gusting to 28 mph. |
| Thursday night |
Fair to partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Cool. Low 46°. Wind southwest around 5 mph, gusting to 20 mph. |
| Friday |
Mostly sunny in the morning, becoming sunny in the afternoon. High 73°. UV index up to 9. Wind southwest around 9 mph, gusting to 29 mph, in the morning, becoming west in the afternoon. |
| Friday night |
Fair in the evening, becoming mostly clear after midnight. Cool. Low 49°. Wind north around 4 mph, gusting to 20 mph, in the evening, becoming east-southeast after midnight. |
WXSIM forecast formatting script by Saratoga-Weather.org.
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