OFallon Missouri Weather

OFallon - Weather Data from OFallon, MO

Latitude: N 38° 50' 20" Longitude: W 90° 43' 42" Altitude: 532 ft

CDT UTC Last station update CDT

WXSIM Forecast for: O'Fallon
Issued by: OFallonweather.com

Updated: Friday, 08-May-2026 04:00 pm

Tonight Rain likely	Saturday Fog a.m.	Saturday night Chance rain	Sunday Mostly Cloudy	Sunday night Partly Cloudy	Monday Mostly Sunny	Monday night Fog late	Tuesday Fog a.m.
.35 in.		<.25 in.					<.1 in.
Low: 56°	High: 80°	Low: 58°	High: 71°	Low: 50°	High: 73°	Low: 51°	High: 79°

WSW 5-23 mph	WSW 7-26 mph	WSW→N 5-21 mph	NNE 7-25 mph	NNE 3-22 mph	NNE→W 3-22 mph	S 5-17 mph	SSW 9-28 mph
	UV: 7 High		UV: 6 High		UV: 7 High		UV: 7 High

Tonight	Cloudy in the evening, becoming fair to partly cloudy after midnight. Light to moderate fog in the evening, then moderate to dense fog after midnight. Rain likely in the evening, then a slight chance of rain after midnight. Low 56°. Wind west-southwest around 5 mph, gusting to 23 mph. Chance of precipitation 60 percent. Precipitation mostly between a quarter and half an inch.
Saturday	Mostly sunny. Moderate fog in the morning. Warm. High 80°. UV index up to 7. Wind west-southwest around 7 mph, gusting to 26 mph.
Saturday night	Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. Light to moderate fog after midnight. A chance of rain. Low 58°. Wind west-southwest around 5 mph, gusting to 21 mph, in the evening, becoming north after midnight. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Sunday	Mostly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. High 71°. UV index up to 6. Wind north-northeast around 7 mph, gusting to 25 mph.
Sunday night	Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Cool. Low 50°. Wind north-northeast around 3 mph, gusting to 22 mph.
Monday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 73°. UV index up to 7. Wind north-northeast around 3 mph, gusting to 22 mph, in the morning, becoming west in the afternoon.
Monday night	Partly cloudy in the evening, becoming fair after midnight. Patchy light fog after midnight. Cool. Low 51°. Wind south around 5 mph, gusting to 17 mph.
Tuesday	Sunny in the morning, becoming mostly sunny in the afternoon. Patchy light fog in the morning. A chance of rain in the afternoon. Warm. High 79°. UV index up to 7. Wind south-southwest around 9 mph, gusting to 28 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Tuesday night	Partly to mostly cloudy in the evening, becoming mostly clear after midnight. Light to moderate fog. Rain likely in the evening, then a slight chance of rain after midnight. Low 57°. Wind west-southwest around 9 mph, gusting to 17 mph. Chance of precipitation 70 percent. Precipitation mostly around half an inch.
Wednesday	Sunny. Patchy light fog in the morning. High 73°. UV index up to 7. Wind northwest around 10 mph, gusting to 29 mph.
Wednesday night	Clear in the evening, becoming mostly clear after midnight. Patchy light fog after midnight. Cool. Low 49°. Wind north around 4 mph, gusting to 23 mph.
Thursday	Mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. High 78°. UV index up to 9. Wind southeast around 8 mph, gusting to 26 mph.
Thursday night	Mostly cloudy in the evening, becoming partly cloudy after midnight. Low 55°. Wind south-southeast around 9 mph, gusting to 22 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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