| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
||||||||||||||||||||||||||||||||||||||||||||||||
| Updated: Wednesday, 22-Apr-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
|
| Today |
Mostly sunny in the morning, becoming partly to mostly sunny in the afternoon. Unusually hot. High 84°. UV index up to 7. Wind southwest around 7 mph, gusting to 29 mph. |
| Tonight |
Fair to partly cloudy in the evening, becoming mostly clear after midnight. Low 58°. Wind west-southwest around 3 mph, gusting to 22 mph, in the evening, becoming south-southwest after midnight. |
| Thursday |
Partly cloudy. Warm. High 83°. UV index up to 7. Wind south around 7 mph, gusting to 27 mph, in the morning, becoming 12 mph, gusting to 28 mph, in the afternoon. |
| Thursday night |
Partly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Patchy light fog after midnight. Rain likely after midnight. Scattered thunderstorms likely. Low 60°. Wind south around 9 mph, gusting to 26 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Friday |
Cloudy in the morning, becoming mostly cloudy in the afternoon. Light to moderate fog in the morning. Rain likely in the morning, then a chance of rain in the afternoon. Scattered thunderstorms likely. High 74°. UV index up to 5. Wind south around 7 mph, gusting to 23 mph, in the morning, becoming west-southwest in the afternoon. Chance of precipitation 80 percent. Precipitation mostly around half an inch. |
| Friday night |
Mostly clear in the evening, becoming clear after midnight. Patchy light fog after midnight. Low 52°. Wind north-northwest around 5 mph, gusting to 21 mph. |
| Saturday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. Warm. High 75°. UV index up to 6. Wind north-northeast around 5 mph, gusting to 24 mph. |
| Saturday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 51°. Wind east-northeast around 5 mph, gusting to 19 mph. |
| Sunday |
Partly to mostly cloudy in the morning, becoming mostly cloudy in the afternoon. A slight chance of rain in the afternoon. High 74°. UV index up to 7. Wind east around 8 mph, gusting to 25 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday night |
Partly cloudy in the evening, becoming mostly cloudy after midnight. Patchy light fog after midnight. A chance of rain. Scattered thundershowers possible. Low 56°. Wind east-southeast around 10 mph, gusting to 20 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Monday |
Cloudy in the morning, becoming mostly cloudy in the afternoon. Light to moderate fog in the afternoon. A chance of rain in the morning, then rain likely in the afternoon. Thunderstorms very likely, some severe. Breezy. High 70°. Wind south around 13 mph, gusting to 24 mph, in the morning, becoming west-southwest in the afternoon. Chance of precipitation 80 percent. Precipitation mostly between half an inch and one inch. |
| Monday night |
Mostly cloudy in the evening, becoming dense overcast after midnight. Patchy light fog in the evening. A slight chance of rain. Scattered thundershowers possible. Breezy. Low 55°. Wind west-southwest around 16 mph, gusting to 31 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday |
Cloudy. Breezy. High 62°. UV index up to 4. Wind west-northwest around 16 mph, gusting to 32 mph. |
| Tuesday night |
Cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 51°. Wind northwest around 12 mph, gusting to 29 mph, in the evening, becoming 6 mph, gusting to 20 mph, after midnight. |
WXSIM forecast formatting script by Saratoga-Weather.org.
Powered by Davis Vantage Pro2
and
CumulusMX
v 4.6.4 (b4128)
MXUI Template v 2.2.6 by
Silver Acorn
Valid HTML5