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: Thursday, 07-May-2026 05:00 am

Today Partly Cloudy	Tonight Partly Cloudy	Friday Chance rain	Friday night Chance rain	Saturday Fog a.m.	Saturday night Chance rain	Sunday Chance rain	Sunday night Clear
		<.1 in.	.25 in.		<.1 in.	<.25 in.
High: 66°	Low: 47°	High: 73°	Low: 51°	High: 77°	Low: 52°	High: 67°	Low: 46°

SW 6-26→10-27 mph	SW 6-22 mph	SW 7-25 mph	WSW 5 mph	WSW 7-26 mph	WSW→NNW 6-17 mph	NNE 7-25 mph	NNE 3-21 mph
UV: 6 High		UV: 5 Medium		UV: 7 High		UV: 5 Medium

Today	Mostly sunny in the morning, becoming partly cloudy in the afternoon. High 66°. UV index up to 6. Wind southwest around 6 mph, gusting to 26 mph, in the morning, becoming 10 mph, gusting to 27 mph, in the afternoon.
Tonight	Fair in the evening, becoming fair to partly cloudy after midnight. Cool. Low 47°. Wind southwest around 6 mph, gusting to 22 mph.
Friday	Partly cloudy in the morning, becoming cloudy in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. High 73°. UV index up to 5. Wind southwest around 7 mph, gusting to 25 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.
Friday night	Cloudy in the evening, becoming mostly clear after midnight. Patchy light fog in the evening, then moderate fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Cool. Low 51°. Wind west-southwest around 5 mph. Chance of precipitation 50 percent. Precipitation mostly around a quarter of an inch.
Saturday	Sunny. Moderate fog in the morning. High 77°. UV index up to 7. Wind west-southwest around 7 mph, gusting to 26 mph.
Saturday night	Fair to partly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. A chance of rain after midnight. Low 52°. Wind west-southwest around 6 mph, gusting to 17 mph, in the evening, becoming north-northwest after midnight. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.
Sunday	Mostly cloudy. Patchy light fog in the morning. A chance of rain in the morning, then a slight chance of rain in the afternoon. High 67°. UV index up to 5. Wind north-northeast around 7 mph, gusting to 25 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Sunday night	Clear. Cool. Low 46°. Wind north-northeast around 3 mph, gusting to 21 mph.
Monday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 72°. UV index up to 6. Wind west-northwest around 4 mph, gusting to 26 mph.
Monday night	Mostly clear in the evening, becoming partly to mostly cloudy after midnight. Cool. Low 50°. Wind south around 5 mph, gusting to 17 mph.
Tuesday	Mostly cloudy in the morning, becoming partly cloudy in the afternoon. Rain likely. High 74°. UV index up to 7. Wind south-southwest around 8 mph, gusting to 22 mph, in the morning, becoming 12 mph, gusting to 27 mph, in the afternoon. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch.
Tuesday night	Partly cloudy in the evening, becoming clear after midnight. Patchy light fog after midnight. Low 55°. Wind west-southwest around 8 mph, gusting to 25 mph.
Wednesday	Mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. Breezy. High 67°. UV index up to 7. Wind northwest around 13 mph, gusting to 32 mph.
Wednesday night	Clear. Cool. Low 46°. Wind north around 7 mph, gusting to 26 mph, in the evening, becoming 4 mph after midnight.

WXSIM forecast formatting script by Saratoga-Weather.org.

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