| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
||||||||||||||||||||||||||||||||||||||||||||||||
| Updated: Tuesday, 12-May-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
|
| Today |
Sunny in the morning, becoming mostly sunny in the afternoon. Warm. High 83°. UV index up to 8. Wind south-southwest around 6 mph, gusting to 25 mph, in the morning, becoming 10 mph, gusting to 27 mph, in the afternoon. |
| Tonight |
Partly cloudy in the evening, becoming clear after midnight. Patchy light fog after midnight. Cool. Low 53°. Wind west around 8 mph, gusting to 21 mph. |
| Wednesday |
Sunny. High 75°. UV index up to 7. Wind northwest around 9 mph, gusting to 28 mph. |
| Wednesday night |
Clear. Cool. Low 50°. Wind north-northwest around 5 mph, gusting to 24 mph, in the evening, becoming northeast after midnight. |
| Thursday |
Sunny in the morning, becoming partly cloudy in the afternoon. High 77°. UV index up to 7. Wind east-southeast around 6 mph, gusting to 27 mph. |
| Thursday night |
Partly cloudy in the evening, becoming mostly cloudy after midnight. A chance of rain after midnight. Cool. Low 52°. Wind east-southeast around 9 mph, gusting to 25 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Friday |
Partly cloudy in the morning, becoming mostly sunny in the afternoon. Patchy light fog in the morning. A chance of rain in the morning, then a slight chance of rain in the afternoon. Precipitation showery or intermittent. Hot. High 88°. UV index up to 8. Wind south-southwest around 10 mph, gusting to 28 mph. Chance of precipitation 50 percent. Precipitation mostly around a quarter of an inch. |
| Friday night |
Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Scattered thundershowers possible. Low 65°. Wind south-southwest around 5 mph, gusting to 19 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Saturday |
Dense overcast 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. Precipitation showery or intermittent. High 79°. UV index up to 5. Wind south-southwest around 7 mph, gusting to 25 mph. Chance of precipitation 70 percent. Precipitation mostly around half an inch. |
| Saturday night |
Fair in the evening, becoming clear after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. Low 67°. Wind south-southeast around 8 mph, gusting to 18 mph. |
| Sunday |
Sunny in the morning, becoming mostly sunny in the afternoon. Light to moderate fog in the morning. Breezy and unusually hot. High 89°. Heat index up to 93°. UV index up to 9. Wind south-southeast around 11 mph, gusting to 29 mph. |
| Sunday night |
Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. Patchy light fog after midnight. Rain likely. Scattered thunderstorms likely. Warm. Low 71°. Wind south-southwest around 10 mph, gusting to 25 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch. |
| Monday |
Cloudy in the morning, becoming dense overcast in the afternoon. Light to moderate fog in the morning, then patchy light fog in the afternoon. Rain likely. Scattered thundershowers possible. High 79°. UV index up to 4. Wind south-southwest around 8 mph, gusting to 20 mph. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch. |
| Monday night |
Dense overcast. Light to moderate fog in the evening, then patchy light fog after midnight. Rain likely. Scattered thundershowers possible. Warm. Low 71°. Wind south around 3 mph, gusting to 15 mph. Chance of precipitation 80 percent. Precipitation mostly around half 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