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: Sunday, 05-Apr-2026 04:00 pm

Tonight Clear	Monday Sunny	Monday night Partly Cloudy	Tuesday Mostly Cloudy	Tuesday night Partly Cloudy	Wednesday Partly Cloudy	Wednesday night Partly Cloudy	Thursday Thunder storm
							<.1 in.
Low: 39°	High: 63°	Low: 41°	High: 54°	Low: 38°	High: 71°	Low: 49°	High: 72°

NW→W 5-27 mph	NNW 7-26 mph	N 7-23 mph	NE→E 8-25 mph	ESE 8-24 mph	SSE 10-28 mph	S 9-23 mph	S 9-26 mph
	UV: 6 High		UV: 4 Medium		UV: 5 Medium		UV: 5 Medium

Tonight	Clear. Cool. Low 39°. Wind northwest around 5 mph, gusting to 27 mph, in the evening, becoming west after midnight.
Monday	Sunny. High 63°. UV index up to 6. Wind north-northwest around 7 mph, gusting to 26 mph.
Monday night	Fair to partly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Low 41°. Wind north around 7 mph, gusting to 23 mph.
Tuesday	Mostly cloudy to cloudy in the morning, becoming mostly cloudy in the afternoon. High 54°. UV index up to 4. Wind northeast around 8 mph, gusting to 25 mph, in the morning, becoming east in the afternoon.
Tuesday night	Partly cloudy. Cold. Low 38°. Wind east-southeast around 8 mph, gusting to 24 mph.
Wednesday	Partly cloudy. Mild. High 71°. UV index up to 5. Wind south-southeast around 10 mph, gusting to 28 mph.
Wednesday night	Partly cloudy. Low 49°. Wind south around 9 mph, gusting to 23 mph.
Thursday	Partly to mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. A chance of rain. Scattered thundershowers possible. Mild. High 72°. UV index up to 5. Wind south around 9 mph, gusting to 26 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.
Thursday night	Cloudy. Patchy light fog in the evening, then light to moderate fog after midnight. A chance of rain in the evening, then rain likely after midnight. Scattered thundershowers possible. Low 55°. Wind south around 5 mph, gusting to 18 mph. Chance of precipitation 70 percent. Precipitation mostly around half an inch.
Friday	Cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Light to moderate fog in the morning. Rain likely in the morning, then a chance of rain in the afternoon. Scattered thundershowers possible. High 63°. Wind north-northeast around 5 mph, gusting to 18 mph. Chance of precipitation 70 percent. Precipitation mostly around half an inch.
Friday night	Mostly cloudy. Patchy light fog. A chance of rain in the evening, then a slight chance of rain after midnight. Low 49°. Wind northeast around 5 mph, gusting to 16 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch.
Saturday	Cloudy in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. Warm. High 76°. UV index up to 6. Wind south around 6 mph in the morning, becoming 10 mph, gusting to 25 mph, in the afternoon.
Saturday night	Partly cloudy in the evening, becoming cloudy after midnight. A slight chance of rain. Precipitation showery or intermittent. Low 59°. Wind south around 10 mph, gusting to 23 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.

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