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 05:00 am

Today Sunny	Tonight Clear	Monday Sunny	Monday night Mostly Cloudy	Tuesday Mostly Cloudy	Tuesday night Partly Cloudy	Wednesday Partly Cloudy	Wednesday night Partly Cloudy

High: 59°	Low: 38°	High: 63°	Low: 41°	High: 53°	Low: 38°	High: 71°	Low: 47°

WNW 9-28 mph	W 5-23 mph	NNW 7-25 mph	N 8-24 mph	NE→E 8-25 mph	ESE 7-24 mph	SSE 9-25→12-28 mph	S 10-24 mph
UV: 6 High		UV: 6 High		UV: 4 Medium		UV: 6 High

Today	Sunny. High 59°. UV index up to 6. Wind west-northwest around 9 mph, gusting to 28 mph.
Tonight	Clear. Cool. Low 38°. Wind west around 5 mph, gusting to 23 mph.
Monday	Sunny. High 63°. UV index up to 6. Wind north-northwest around 7 mph, gusting to 25 mph.
Monday night	Mostly cloudy to cloudy. Low 41°. Wind north around 8 mph, gusting to 24 mph.
Tuesday	Cloudy in the morning, becoming mostly cloudy in the afternoon. High 53°. 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 7 mph, gusting to 24 mph.
Wednesday	Partly cloudy in the morning, becoming mostly sunny in the afternoon. Mild. High 71°. UV index up to 6. Wind south-southeast around 9 mph, gusting to 25 mph, in the morning, becoming 12 mph, gusting to 28 mph, in the afternoon.
Wednesday night	Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 47°. Wind south around 10 mph, gusting to 24 mph.
Thursday	Partly cloudy in the morning, becoming mostly cloudy in the afternoon. Warm. High 74°. UV index up to 5. Wind south around 8 mph, gusting to 25 mph.
Thursday night	Mostly cloudy to cloudy. Patchy light fog after midnight. A chance of rain. Precipitation showery or intermittent. Low 54°. Wind south around 5 mph, gusting to 19 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Friday	Cloudy in the morning, becoming dense overcast in the afternoon. Patchy light fog in the morning. Rain likely. Precipitation showery or intermittent. High 64°. Wind south-southeast around 2 mph in the morning, becoming northeast in the afternoon. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch.
Friday night	Dense overcast. Patchy light fog. A chance of rain in the evening, then a slight chance of rain after midnight. Precipitation showery or intermittent. Low 56°. Wind southeast around 4 mph in the evening, becoming 7 mph after midnight. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch.
Saturday	Partly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Patchy light fog in the morning. Breezy and warm. High 77°. UV index up to 5. Wind south around 10 mph, gusting to 27 mph, in the morning, becoming 14 mph, gusting to 29 mph, in the afternoon.
Saturday night	Dense overcast in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Scattered thundershowers possible. Breezy and mild. Low 61°. Wind south around 12 mph, gusting to 25 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.

WXSIM forecast formatting script by Saratoga-Weather.org.

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