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, 22-Aug-2025 04:00 pm

Tonight Fog late	Saturday Fog a.m.	Saturday night Partly Cloudy	Sunday Fog a.m.	Sunday night Partly Cloudy	Monday Mostly Cloudy	Monday night Mostly Clear	Tuesday Sunny

Low: 66°	High: 87°	Low: 62°	High: 80°	Low: 59°	High: 79°	Low: 54°	High: 78°

ENE→SSW 2-21 mph	WSW→WNW 4-23 mph	NW 6-19 mph	NW 7-27 mph	NW 4-22 mph	NNW 5-25 mph	N 4-22 mph	NNE 4-24 mph
	UV: 6 High		UV: 8 Very High		UV: 6 High		UV: 7 High

Tonight	Clear in the evening, becoming fair after midnight. Patchy light fog after midnight. Low 66°. Wind east-northeast around 2 mph, gusting to 21 mph, in the evening, becoming south-southwest after midnight.
Saturday	Partly cloudy in the morning, becoming mostly cloudy in the afternoon. Patchy light fog in the morning. High 87°. UV index up to 6. Wind west-southwest around 4 mph, gusting to 23 mph, in the morning, becoming west-northwest in the afternoon.
Saturday night	Partly cloudy in the evening, becoming clear after midnight. Low 62°. Wind northwest around 6 mph, gusting to 19 mph.
Sunday	Sunny. Patchy light fog in the morning. High 80°. UV index up to 8. Wind northwest around 7 mph, gusting to 27 mph.
Sunday night	Clear in the evening, becoming fair to partly cloudy after midnight. Relatively cool. Low 59°. Wind northwest around 4 mph, gusting to 22 mph.
Monday	Partly to mostly cloudy. High 79°. UV index up to 6. Wind north-northwest around 5 mph, gusting to 25 mph.
Monday night	Mostly clear in the evening, becoming clear after midnight. Unusually cool. Low 54°. Wind north around 4 mph, gusting to 22 mph.
Tuesday	Sunny. High 78°. UV index up to 7. Wind north-northeast around 4 mph, gusting to 24 mph.
Tuesday night	Clear. Unusually cool. Low 53°. Wind east-northeast around 2 mph, gusting to 17 mph.
Wednesday	Sunny in the morning, becoming mostly sunny in the afternoon. High 82°. UV index up to 7. Wind south around 2 mph, gusting to 24 mph, in the morning, becoming north-northwest in the afternoon.
Wednesday night	Partly cloudy. Relatively cool. Low 57°. Wind east around 3 mph, gusting to 16 mph, in the evening, becoming south after midnight.
Thursday	Mostly cloudy in the morning, becoming partly cloudy in the afternoon. High 84°. UV index up to 6. Wind south around 4 mph, gusting to 22 mph, in the morning, becoming southwest in the afternoon.
Thursday night	Clear. Unusually cool. Low 54°. Wind southwest around 2 mph, gusting to 18 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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