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: Friday, 27-Mar-2026 05:00 am

Today Partly Cloudy	Tonight Partly Cloudy	Saturday Sunny	Saturday night Partly Cloudy	Sunday Partly Cloudy	Sunday night Partly Cloudy	Monday Partly Cloudy	Monday night Partly Cloudy

High: 55°	Low: 32°	High: 56°	Low: 36°	High: 68°	Low: 43°	High: 81°	Low: 59°

NNE 12-30 mph	NNW 9-26→4 mph	E→SE 6-24 mph	SSE 7-22 mph	SSE 9-26 mph	S 8-18 mph	SSW 11-27 mph	SSW 12-23 mph
UV: 7 High		UV: 7 High		UV: 7 High		UV: 5 Medium

Today	Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Breezy. High 55°. UV index up to 7. Wind north-northeast around 12 mph, gusting to 30 mph.
Tonight	Fair to partly cloudy in the evening, becoming clear after midnight. Cold. Low 32°. Wind north-northwest around 9 mph, gusting to 26 mph, in the evening, becoming 4 mph after midnight.
Saturday	Sunny. High 56°. UV index up to 7. Wind east around 6 mph, gusting to 24 mph, in the morning, becoming southeast in the afternoon.
Saturday night	Clear in the evening, becoming fair to partly cloudy after midnight. Low 36°. Wind south-southeast around 7 mph, gusting to 22 mph.
Sunday	Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Mild. High 68°. UV index up to 7. Wind south-southeast around 9 mph, gusting to 26 mph.
Sunday night	Fair to partly cloudy in the evening, becoming fair after midnight. Low 43°. Wind south around 8 mph, gusting to 18 mph.
Monday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Unusually hot. High 81°. UV index up to 5. Wind south-southwest around 11 mph, gusting to 27 mph.
Monday night	Partly cloudy. Breezy and mild. Low 59°. Wind south-southwest around 12 mph, gusting to 23 mph.
Tuesday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. A chance of rain in the afternoon. Breezy and unusually hot. High 85°. UV index up to 5. Wind south-southwest around 13 mph, gusting to 30 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch.
Tuesday night	Dense overcast. Patchy light fog. Rain likely. Low 50°. Wind north-northwest around 10 mph, gusting to 27 mph. Chance of precipitation 80 percent. Precipitation mostly around an inch.
Wednesday	Mostly cloudy in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. High 58°. UV index up to 5. Wind north around 9 mph, gusting to 27 mph.
Wednesday night	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 42°. Wind east-northeast around 8 mph, gusting to 22 mph.
Thursday	Cloudy in the morning, becoming dense overcast in the afternoon. A chance of rain in the morning, then rain likely in the afternoon. Breezy and cold. High 45°, but temperatures falling in the afternoon. Wind chill around 35. Wind east around 13 mph, gusting to 26 mph. Chance of precipitation 80 percent. Precipitation mostly between 1 and 2 inches.
Thursday night	Cloudy in the evening, becoming partly to mostly cloudy after midnight. Light to moderate fog in the evening, then patchy light fog after midnight. Rain likely in the evening, then a slight chance of rain after midnight. Low 40°, but temperatures rising after midnight. Wind chill ranging from 34 to 44. Wind east around 7 mph, gusting to 17 mph, in the evening, becoming south around 3 mph after midnight. Chance of precipitation 70 percent. Precipitation mostly around half an inch.

WXSIM forecast formatting script by Saratoga-Weather.org.

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