| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Monday, 30-Mar-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Sunny in the morning, becoming partly to mostly sunny in the afternoon. Breezy and exceptionally hot. High 88°. UV index up to 7. Wind south-southwest around 11 mph, gusting to 30 mph. |
| Tonight |
Partly cloudy. Mild. Low 61°. Wind south-southwest around 10 mph, gusting to 25 mph. |
| Tuesday |
Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. A slight chance of rain. Scattered thunderstorms likely. Breezy and exceptionally hot. High 87°. UV index up to 6. Wind south-southwest around 11 mph, gusting to 31 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday night |
Mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. A chance of rain. Scattered thunderstorms likely. Mild. Low 56°. Wind west around 5 mph, gusting to 21 mph, in the evening, becoming north after midnight. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday |
Mostly cloudy to cloudy in the morning, becoming cloudy in the afternoon. Patchy light fog in the morning. Rain likely. Precipitation showery or intermittent. High 61°. Wind east-northeast around 6 mph, gusting to 15 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Wednesday night |
Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. Low 55°. Wind east-southeast around 9 mph, gusting to 17 mph, in the evening, becoming south-southeast after midnight. |
| Thursday |
Cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. A slight chance of rain in the morning, then rain likely in the afternoon. Thunderstorms very likely, some severe. Breezy and warm. High 77°. UV index up to 4. Wind south around 14 mph, gusting to 29 mph. Chance of precipitation 70 percent. Precipitation mostly around a quarter of an inch. |
| Thursday night |
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Moderate fog. A chance of rain in the evening, then a slight chance of rain after midnight. Thunderstorms very likely, some possibly severe. Mild. Low 58°. Wind south-southwest around 9 mph, gusting to 22 mph, in the evening, becoming north-northwest around 4 mph, gusting to 15 mph, after midnight. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Friday |
Partly to mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Light to moderate fog in the morning. Warm. High 74°. Wind east-southeast around 4 mph, gusting to 15 mph, in the morning, becoming south-southeast around 8 mph, gusting to 22 mph, in the afternoon. |
| Friday night |
Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. Patchy light fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Thunderstorms very likely, some possibly severe. Mild. Low 63°. Wind south-southeast around 8 mph, gusting to 20 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Saturday |
Dense overcast in the morning, becoming cloudy in the afternoon. Patchy light fog. Rain very likely. Thunderstorms very likely, some possibly severe. Mild. High 70°. Wind south-southwest around 8 mph, gusting to 23 mph, in the morning, becoming west-southwest around 13 mph, gusting to 30 mph, in the afternoon. Chance of precipitation 80 percent. Precipitation mostly around an inch. |
| Saturday night |
Partly to mostly cloudy. Light to moderate fog. Low 48°. Wind west-northwest around 7 mph, gusting to 28 mph, in the evening, becoming north-northwest after midnight. |
| Sunday |
Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Light to moderate fog in the morning, then patchy light fog in the afternoon. High 57°. UV index up to 5. Wind north-northwest around 5 mph, gusting to 23 mph. |
| Sunday night |
Clear in the evening, becoming fair to partly cloudy after midnight. Patchy light fog after midnight. Low 45°. Wind east-northeast around 4 mph, gusting to 18 mph. |
WXSIM forecast formatting script by Saratoga-Weather.org.
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