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: Tuesday, 12-May-2026 04:00 pm

Tonight Partly Cloudy	Wednesday Sunny	Wednesday night Clear	Thursday Partly Cloudy	Thursday night Chance rain	Friday Rain likely	Friday night Partly Cloudy	Saturday Chance rain
				.25 in.	.5 in.	<.1 in.	<.25 in.
Low: 59°	High: 76°	Low: 51°	High: 77°	Low: 52°	High: 82°	Low: 60°	High: 81°

SW→WNW 7-26 mph	NNW 9-29 mph	NNW→ENE 3-23 mph	SE 5-24 mph	SE 9-23 mph	SSE→SW 8-21 mph	SSE 6-17 mph	SSW 6-21 mph
	UV: 7 High		UV: 7 High		UV: 6 High		UV: 6 High

Tonight	Partly cloudy in the evening, becoming clear after midnight. Low 59°. Wind southwest around 7 mph, gusting to 26 mph, in the evening, becoming west-northwest after midnight.
Wednesday	Sunny. High 76°. UV index up to 7. Wind north-northwest around 9 mph, gusting to 29 mph.
Wednesday night	Clear. Cool. Low 51°. Wind north-northwest around 3 mph, gusting to 23 mph, in the evening, becoming east-northeast after midnight.
Thursday	Sunny in the morning, becoming partly cloudy in the afternoon. High 77°. UV index up to 7. Wind southeast around 5 mph, gusting to 24 mph.
Thursday night	Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. A chance of rain after midnight. Cool. Low 52°. Wind southeast around 9 mph, gusting to 23 mph. Chance of precipitation 50 percent. Precipitation mostly around a quarter of an inch.
Friday	Mostly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. Rain likely. Warm. High 82°. UV index up to 6. Wind south-southeast around 8 mph, gusting to 21 mph, in the morning, becoming southwest in the afternoon. Chance of precipitation 70 percent. Precipitation mostly around half an inch.
Friday night	Partly cloudy. A slight chance of rain after midnight. Low 60°. Wind south-southeast around 6 mph, gusting to 17 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Saturday	Partly to mostly cloudy in the morning, becoming mostly cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. Precipitation showery or intermittent. High 81°. UV index up to 6. Wind south-southwest around 6 mph, gusting to 21 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Saturday night	Partly cloudy. Patchy light fog in the evening, then light to moderate fog after midnight. Low 65°. Wind south-southeast around 6 mph, gusting to 19 mph.
Sunday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Light to moderate fog in the morning. Hot. High 86°. UV index up to 7. Wind south around 9 mph, gusting to 26 mph.
Sunday night	Fair in the evening, becoming cloudy after midnight. Breezy. Low 69°. Wind south around 11 mph, gusting to 24 mph.
Monday	Cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. A chance of rain. Scattered thunderstorms likely, some possibly severe. Breezy and warm. High 84°. UV index up to 6. Wind south around 13 mph, gusting to 27 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Monday night	Partly cloudy in the evening, becoming cloudy after midnight. Patchy light fog after midnight. Rain likely. Scattered thunderstorms likely. Breezy and warm. Low 70°. Wind south around 15 mph, gusting to 27 mph, in the evening, becoming 10 mph, gusting to 21 mph, after midnight. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch.

WXSIM forecast formatting script by Saratoga-Weather.org.

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