| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
||||||||||||||||||||||||||||||||||||||||||||||||
| Updated: Monday, 13-Jul-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
|
| Tonight |
Fair. Patchy light fog after midnight. Low 70°. Wind northeast around 3 mph, gusting to 24 mph. |
| Tuesday |
Mostly sunny in the morning, becoming partly to mostly sunny in the afternoon. Patchy light fog in the morning. Hot. High 91°. Heat index up to 96°. UV index up to 9. Wind northeast around 5 mph, gusting to 24 mph. |
| Tuesday night |
Fair to partly cloudy in the evening, becoming fair after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. A chance of rain. Low 72°. Wind northeast around 3 mph, gusting to 19 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday |
Partly to mostly sunny. Light to moderate fog in the morning. A chance of rain. High 89°. Heat index up to 97°. UV index up to 9. Wind north-northeast around 3 mph, gusting to 21 mph, in the morning, becoming east in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday night |
Fair in the evening, becoming mostly clear after midnight. Patchy light fog in the evening, then moderate fog after midnight. Low 72°. Wind southeast around 2 mph, gusting to 16 mph, in the evening, becoming south-southwest after midnight. |
| Thursday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Light to moderate fog in the morning. A chance of rain. Scattered thundershowers possible. Hot. High 91°. Heat index up to 100°. UV index up to 8. Wind south around 3 mph, gusting to 21 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday night |
Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. Light to moderate fog. A chance of rain. Scattered thundershowers possible. Low 75°. Wind southwest around 4 mph, gusting to 18 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Friday |
Partly cloudy. Light to moderate fog in the morning. Rain likely. Scattered thundershowers possible. High 89°. Heat index up to 97°. UV index up to 9. Wind west-southwest around 6 mph, gusting to 24 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Friday night |
Mostly cloudy in the evening, becoming fair after midnight. Moderate fog. A chance of rain. Scattered thunderstorms likely. Low 75°. Wind southwest around 5 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday |
Mostly sunny. Moderate fog in the morning. Hot. High 93°. Heat index up to 103°. UV index up to 9. Wind southwest around 7 mph, gusting to 25 mph. |
| Saturday night |
Clear in the evening, becoming mostly clear after midnight. Moderate fog after midnight. Low 73°. Wind southwest around 5 mph, gusting to 21 mph. |
| Sunday |
Partly cloudy. Light to moderate fog in the morning. A slight chance of rain in the morning, then a chance of rain in the afternoon. Scattered thunderstorms likely. Hot. High 92°. Heat index up to 101°. UV index up to 9. Wind west around 5 mph, gusting to 22 mph, in the morning, becoming north-northwest in the afternoon. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday night |
Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Moderate fog in the evening, then moderate to dense fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Scattered thunderstorms likely. Low 73°. Wind northeast around 5 mph, gusting to 17 mph. Chance of precipitation 60 percent. Precipitation mostly around 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