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, 07-Apr-2026 04:00 pm

Tonight Partly Cloudy	Wednesday Mostly Sunny	Wednesday night Partly Cloudy	Thursday Mostly Cloudy	Thursday night Partly Cloudy	Friday Rain likely	Friday night Rain likely	Saturday Chance rain
					.35 in.	.25 in.	.1 in.
Low: 42°	High: 69°	Low: 45°	High: 74°	Low: 49°	High: 64°	Low: 53°	High: 64°

ESE 8-24 mph	SSE 10-27 mph	SSW 8-21 mph	SSW 7-24 mph	SSW 5→9 mph	SW→NW 6 mph	NE 3 mph	ESE 6-16 mph
	UV: 7 High		UV: 7 High

Tonight	Partly cloudy. Low 42°. Wind east-southeast around 8 mph, gusting to 24 mph.
Wednesday	Mostly sunny in the morning, becoming partly to mostly sunny in the afternoon. High 69°. UV index up to 7. Wind south-southeast around 10 mph, gusting to 27 mph.
Wednesday night	Fair in the evening, becoming fair to partly cloudy after midnight. Low 45°. Wind south-southwest around 8 mph, gusting to 21 mph.
Thursday	Partly to mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. Warm. High 74°. UV index up to 7. Wind south-southwest around 7 mph, gusting to 24 mph.
Thursday night	Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Low 49°. Wind south-southwest around 5 mph in the evening, becoming 9 mph after midnight.
Friday	Mostly cloudy to cloudy in the morning, becoming dense overcast in the afternoon. Patchy light fog in the afternoon. A chance of rain in the morning, then rain likely in the afternoon. High 64°. Wind southwest around 6 mph in the morning, becoming northwest in the afternoon. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch.
Friday night	Dense overcast in the evening, becoming cloudy after midnight. Patchy light fog. Rain likely. Low 53°. Wind northeast around 3 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter 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. High 64°. Wind east-southeast around 6 mph, gusting to 16 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch.
Saturday night	Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Patchy light fog after midnight. Low 49°. Wind southeast around 7 mph, gusting to 15 mph.
Sunday	Partly to mostly sunny in the morning, becoming mostly cloudy in the afternoon. Patchy light fog in the morning. Breezy and warm. High 78°. UV index up to 8. Wind southeast around 9 mph, gusting to 24 mph, in the morning, becoming south around 14 mph, gusting to 29 mph, in the afternoon.
Sunday night	Mostly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. A chance of rain. Breezy. Low 55°. Wind south around 12 mph, gusting to 22 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Monday	Mostly sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. Breezy and warm. High 79°. UV index up to 7. Wind south around 15 mph, gusting to 32 mph.
Monday night	Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Breezy. Low 58°. Wind south-southwest around 13 mph, gusting to 25 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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