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: Wednesday, 27-May-2026 04:00 pm

Tonight Partly Cloudy	Thursday Partly Cloudy	Thursday night Mostly Cloudy	Friday Rain likely	Friday night Chance rain	Saturday Chance rain	Saturday night Mostly Cloudy	Sunday Partly Cloudy
			.35 in.	.1 in.	.1 in.
Low: 64°	High: 85°	Low: 62°	High: 77°	Low: 65°	High: 77°	Low: 64°	High: 85°

ENE 2-22 mph	ENE 5-23→9-26 mph	ENE 6-23 mph	E 5-19 mph	ENE 4 mph	ENE 5-21 mph	E 5-21 mph	ESE 6-25 mph
	UV: 9 Very High		UV: 5 Medium		UV: 6 High		UV: 8 Very High

Tonight	Partly cloudy. Low 64°. Wind east-northeast around 2 mph, gusting to 22 mph.
Thursday	Partly cloudy. Hot. High 85°. UV index up to 9. Wind east-northeast around 5 mph, gusting to 23 mph, in the morning, becoming 9 mph, gusting to 26 mph, in the afternoon.
Thursday night	Partly to mostly cloudy. Low 62°. Wind east-northeast around 6 mph, gusting to 23 mph.
Friday	Mostly cloudy in the morning, becoming cloudy in the afternoon. A slight chance of rain in the morning, then rain likely in the afternoon. High 77°. UV index up to 5. Wind east around 5 mph, gusting to 19 mph. Chance of precipitation 60 percent. Precipitation mostly between a quarter and half an inch.
Friday night	Cloudy. Patchy light fog. A slight chance of rain in the evening, then a chance of rain after midnight. Precipitation showery or intermittent. Low 65°. Wind east-northeast around 4 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch.
Saturday	Cloudy in the morning, becoming mostly cloudy to cloudy 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. High 77°. UV index up to 6. Wind east-northeast around 5 mph, gusting to 21 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch.
Saturday night	Mostly cloudy. Low 64°. Wind east around 5 mph, gusting to 21 mph.
Sunday	Partly cloudy. High 85°. UV index up to 8. Wind east-southeast around 6 mph, gusting to 25 mph.
Sunday night	Partly cloudy in the evening, becoming fair to partly cloudy after midnight. A slight chance of rain after midnight. Low 61°. Wind east-southeast around 3 mph, gusting to 21 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Monday	Partly to mostly sunny. Warm. High 85°. UV index up to 9. Wind northeast around 4 mph, gusting to 23 mph.
Monday night	Mostly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 61°. Wind east-northeast around 5 mph, gusting to 21 mph.
Tuesday	Partly cloudy in the morning, becoming mostly cloudy in the afternoon. High 81°. UV index up to 7. Wind east around 6 mph, gusting to 25 mph.
Tuesday night	Fair in the evening, becoming fair to partly cloudy after midnight. Relatively cool. Low 57°. Wind east-southeast around 4 mph, gusting to 21 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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