| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
||||||||||||||||||||||||||||||||||||||||||||||||
| Updated: Tuesday, 14-Jul-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
|
| Tonight |
Fair to partly cloudy in the evening, becoming fair after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. Low 73°. Wind northeast around 3 mph, gusting to 21 mph. |
| Wednesday |
Mostly sunny in the morning, becoming partly to mostly sunny in the afternoon. Light to moderate fog in the morning. A slight chance of rain in the morning, then a chance of rain in the afternoon. Scattered thundershowers possible. High 90°. Heat index up to 97°. UV index up to 9. Wind northeast around 4 mph, gusting to 22 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday night |
Fair to partly cloudy. Light to moderate fog in the evening, then moderate fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Scattered thundershowers possible. Low 74°. Wind east around 2 mph, gusting to 16 mph, in the evening, becoming south after midnight. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Thursday |
Partly to mostly sunny in the morning, becoming mostly cloudy in the afternoon. Moderate fog in the morning. Rain likely. Thunderstorms very likely, some possibly severe. High 88°. Heat index up to 95°. UV index up to 8. Wind south-southeast around 3 mph, gusting to 18 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch. |
| Thursday night |
Mostly cloudy in the evening, becoming partly to mostly cloudy after midnight. Light to moderate fog in the evening, then moderate fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Thunderstorms very likely, some possibly severe. Low 76°. Wind southwest around 4 mph, gusting to 16 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Friday |
Partly to mostly cloudy in the morning, becoming mostly cloudy in the afternoon. Light to moderate fog. A chance of rain in the morning, then rain likely in the afternoon. Scattered thunderstorms likely. High 83°. UV index up to 6. Wind southwest around 6 mph, gusting to 20 mph. Chance of precipitation 70 percent. Precipitation mostly around half an inch. |
| Friday night |
Moderate fog. A chance of rain. Scattered thunderstorms likely. Low 73°. Wind southwest around 6 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday |
Partly cloudy in the morning, becoming mostly sunny in the afternoon. Patchy light fog in the morning. A slight chance of rain. Scattered thunderstorms likely, some possibly severe. Hot. High 95°. Heat index up to 105°. UV index up to 9. Wind west around 8 mph, gusting to 26 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday night |
Fair in the evening, becoming partly cloudy after midnight. Low 75°. Wind west around 7 mph, gusting to 22 mph. |
| Sunday |
Partly to mostly cloudy. A chance of rain in the afternoon. Thunderstorms very likely, some possibly severe. Hot. High 94°. Heat index up to 103°. UV index up to 7. Wind west around 5 mph, gusting to 21 mph, in the morning, becoming northwest in the afternoon. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog. A slight chance of rain in the evening. Scattered thunderstorms likely, some possibly severe. Low 76°. Wind southwest around 3 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Monday |
Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. Hot. High 96°. Heat index up to 106°. UV index up to 8. Wind southwest around 9 mph, gusting to 26 mph. |
| Monday night |
Mostly cloudy in the evening, becoming partly to mostly cloudy after midnight. Moderate fog after midnight. A chance of rain. Thunderstorms very likely, some possibly severe. Low 71°. Wind northwest around 6 mph, gusting to 22 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
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