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 Partly Cloudy	Wednesday night Partly Cloudy	Thursday Partly Cloudy	Thursday night Partly Cloudy	Friday Thunder storm	Friday night Rain likely	Saturday Thunder storm
					.35 in.	.25 in.	.1 in.
Low: 41°	High: 71°	Low: 47°	High: 75°	Low: 52°	High: 65°	Low: 51°	High: 65°

ESE 7-24 mph	SSE 10-29 mph	SSW 8-22 mph	SSW 7-24 mph	SSW 5-15→9 mph	SW→NW 6-15 mph	NE 3 mph	ESE 6-17 mph
	UV: 5 Medium		UV: 5 Medium

Tonight	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Cool. Low 41°. Wind east-southeast around 7 mph, gusting to 24 mph.
Wednesday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Mild. High 71°. UV index up to 5. Wind south-southeast around 10 mph, gusting to 29 mph.
Wednesday night	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 47°. Wind south-southwest around 8 mph, gusting to 22 mph.
Thursday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Warm. High 75°. UV index up to 5. 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 52°. Wind south-southwest around 5 mph, gusting to 15 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. Scattered thundershowers possible. High 65°. Wind southwest around 6 mph, gusting to 15 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. Precipitation showery or intermittent. Low 51°. 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. Scattered thundershowers possible. High 65°. Wind east-southeast around 6 mph, gusting to 17 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. Low 50°. Wind southeast around 7 mph, gusting to 16 mph.
Sunday	Partly to mostly sunny in the morning, becoming mostly cloudy in the afternoon. Breezy and warm. High 79°. UV index up to 7. Wind southeast around 9 mph, gusting to 25 mph, in the morning, becoming south around 13 mph, gusting to 30 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. Scattered thundershowers possible. Breezy. Low 59°. Wind south around 12 mph, gusting to 23 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 unusually warm. High 81°. 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. Patchy light fog after midnight. Breezy and mild. Low 62°. Wind south-southwest around 13 mph, gusting to 26 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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