| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Saturday, 16-May-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. A chance of rain. Scattered thunderstorms likely, some possibly severe. Low 65°. Wind south-southeast around 5 mph, gusting to 15 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday |
Partly to mostly sunny in the morning, becoming sunny in the afternoon. Patchy light fog in the morning. Hot. High 86°. UV index up to 8. Wind south-southeast around 11 mph, gusting to 29 mph. |
| Sunday night |
Fair to partly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. A chance of rain after midnight. Scattered thundershowers possible. Low 67°. Wind south-southeast around 10 mph, gusting to 23 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Monday |
Mostly cloudy to cloudy in the morning, becoming partly to mostly cloudy in the afternoon. A chance of rain in the morning, then rain likely in the afternoon. Thunderstorms very likely, some possibly severe. High 80°. UV index up to 7. Wind south around 9 mph, gusting to 23 mph. Chance of precipitation 80 percent. Precipitation mostly between a quarter and half an inch. |
| Monday night |
Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. Patchy light fog. A chance of rain. Scattered thunderstorms likely, some possibly severe. Breezy and warm. Low 72°. Wind south around 12 mph, gusting to 22 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday |
Cloudy. Patchy light fog in the morning, then light to moderate fog in the afternoon. A chance of rain in the morning, then rain likely in the afternoon. Thunderstorms very likely, some possibly severe. High 78°, but temperatures falling in the afternoon. UV index up to 4. Wind south around 10 mph, gusting to 25 mph, in the morning, becoming west-southwest in the afternoon. Chance of precipitation 90 percent. Precipitation mostly between a quarter and half an inch. |
| Tuesday night |
Mostly cloudy to cloudy in the evening, becoming mostly cloudy after midnight. Light to moderate fog in the evening. A chance of rain. Scattered thunderstorms likely. Low 60°. Wind northwest around 7 mph, gusting to 23 mph. Chance of precipitation 50 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday |
Partly cloudy. High 74°. UV index up to 8. Wind north around 8 mph, gusting to 28 mph. |
| Wednesday night |
Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Cool. Low 53°. Wind north-northeast around 6 mph, gusting to 24 mph. |
| Thursday |
Partly cloudy in the morning, becoming mostly cloudy in the afternoon. High 73°. UV index up to 6. Wind north-northeast around 7 mph, gusting to 25 mph. |
| Thursday night |
Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Cool. Low 52°. Wind northeast around 4 mph, gusting to 22 mph. |
| Friday |
Partly to mostly cloudy in the morning, becoming dense overcast in the afternoon. A chance of rain. Scattered thundershowers possible. High 70°. UV index up to 5. Wind east-northeast around 6 mph, gusting to 24 mph, in the morning, becoming east-southeast in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Friday night |
Dense overcast. A chance of rain. Scattered thunderstorms likely. Low 61°. Wind east-southeast around 4 mph, gusting to 19 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
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