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: Saturday, 09-May-2026 05:00 am

Today Mostly Sunny	Tonight Mostly Cloudy	Sunday Partly Cloudy	Sunday night Partly Cloudy	Monday Sunny	Monday night Clear	Tuesday Mostly Sunny	Tuesday night Chance rain
	<.1 in.						.1 in.
High: 80°	Low: 56°	High: 72°	Low: 47°	High: 73°	Low: 47°	High: 80°	Low: 52°

WSW 9-28 mph	SW→N 6-20 mph	N 8-27 mph	N→NE 2-23 mph	W 3-24→6-24 mph	SSW 5-19 mph	SSW 8-28→11-29 mph	W 8-22 mph
UV: 7 High		UV: 6 High		UV: 7 High		UV: 8 Very High

Today	Mostly sunny. Warm. High 80°. UV index up to 7. Wind west-southwest around 9 mph, gusting to 28 mph.
Tonight	Mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. A slight chance of rain. Low 56°. Wind southwest around 6 mph, gusting to 20 mph, in the evening, becoming north after midnight. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Sunday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. High 72°. UV index up to 6. Wind north around 8 mph, gusting to 27 mph.
Sunday night	Partly cloudy. Cool. Low 47°. Wind north around 2 mph, gusting to 23 mph, in the evening, becoming northeast after midnight.
Monday	Sunny. High 73°. UV index up to 7. Wind west around 3 mph, gusting to 24 mph, in the morning, becoming 6 mph, gusting to 24 mph, in the afternoon.
Monday night	Fair in the evening, becoming clear after midnight. Cool. Low 47°. Wind south-southwest around 5 mph, gusting to 19 mph.
Tuesday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. Warm. High 80°. UV index up to 8. Wind south-southwest around 8 mph, gusting to 28 mph, in the morning, becoming 11 mph, gusting to 29 mph, in the afternoon.
Tuesday night	Partly cloudy in the evening, becoming mostly clear after midnight. A chance of rain. Cool. Low 52°. Wind west around 8 mph, gusting to 22 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch.
Wednesday	Sunny. High 74°. UV index up to 7. Wind northwest around 9 mph, gusting to 29 mph, in the morning, becoming 13 mph, gusting to 30 mph, in the afternoon.
Wednesday night	Clear. Cool. Low 47°. Wind north around 7 mph, gusting to 27 mph, in the evening, becoming 3 mph after midnight.
Thursday	Sunny in the morning, becoming mostly sunny in the afternoon. High 76°. UV index up to 8. Wind east-northeast around 6 mph, gusting to 26 mph.
Thursday night	Fair to partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Cool. Low 53°. Wind south-southeast around 9 mph, gusting to 21 mph.
Friday	Partly to mostly cloudy in the morning, becoming sunny in the afternoon. Unusually hot. High 88°. UV index up to 10. Wind southwest around 10 mph, gusting to 29 mph.
Friday night	Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 58°. Wind southwest around 6 mph, gusting to 22 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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