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, 30-Apr-2026 04:00 pm

Tonight Partly Cloudy	Friday Partly Cloudy	Friday night Partly Cloudy	Saturday Partly Cloudy	Saturday night Clear	Sunday Mostly Sunny	Sunday night Rain likely	Monday Thunder storm
						.5 in.	.35 in.
Low: 45°	High: 62°	Low: 43°	High: 61°	Low: 42°	High: 71°	Low: 51°	High: 75°

WNW 7-24 mph	NNW 5-24 mph	NNW 2-18 mph	NNW 7-26 mph	NW→SSW 4-23 mph	SSW 10-29 mph	SW 5-20 mph	SSW 11-29 mph
	UV: 6 High		UV: 5 Medium		UV: 7 High		UV: 5 Medium

Tonight	Mostly cloudy to cloudy in the evening, becoming partly cloudy after midnight. Cool. Low 45°. Wind west-northwest around 7 mph, gusting to 24 mph.
Friday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. High 62°. UV index up to 6. Wind north-northwest around 5 mph, gusting to 24 mph.
Friday night	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Cool. Low 43°. Wind north-northwest around 2 mph, gusting to 18 mph.
Saturday	Partly cloudy. Cool. High 61°. UV index up to 5. Wind north-northwest around 7 mph, gusting to 26 mph.
Saturday night	Clear. Cool. Low 42°. Wind northwest around 4 mph, gusting to 23 mph, in the evening, becoming south-southwest after midnight.
Sunday	Sunny in the morning, becoming mostly sunny in the afternoon. High 71°. UV index up to 7. Wind south-southwest around 10 mph, gusting to 29 mph.
Sunday night	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Moderate fog after midnight. Rain likely. Low 51°. Wind southwest around 5 mph, gusting to 20 mph. Chance of precipitation 70 percent. Precipitation mostly around half an inch.
Monday	Partly to mostly cloudy. Light to moderate fog in the morning. A slight chance of rain in the morning, then rain likely in the afternoon. Scattered thundershowers possible. High 75°. UV index up to 5. Wind south-southwest around 11 mph, gusting to 29 mph. Chance of precipitation 60 percent. Precipitation mostly between a quarter and half an inch.
Monday night	Mostly cloudy to cloudy in the evening, becoming dense overcast after midnight. Moderate fog in the evening, then light to moderate fog after midnight. Rain very likely. Scattered thunderstorms likely. Low 57°. Wind southwest around 5 mph, gusting to 16 mph, in the evening, becoming west after midnight. Chance of precipitation 80 percent. Precipitation mostly around 2 inches.
Tuesday	Cloudy 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. Cool. High 60°. Wind north around 8 mph, gusting to 25 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch.
Tuesday night	Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Cool. Low 46°. Wind north-northwest around 6 mph, gusting to 24 mph.
Wednesday	Partly cloudy in the morning, becoming cloudy in the afternoon. A slight chance of rain. High 64°. UV index up to 5. Wind west-northwest around 5 mph, gusting to 27 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Wednesday night	Mostly cloudy to cloudy in the evening, becoming clear after midnight. Cool. Low 46°. Wind northwest around 3 mph, gusting to 16 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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