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: Wednesday, 07-Oct-2026 05:00 am

Today Sunny	Tonight Clear	Thursday Sunny	Thursday night Clear	Friday Sunny	Friday night Clear	Saturday Partly Cloudy	Saturday night Rain likely
							.5 in.
High: 87°	Low: 52°	High: 82°	Low: 51°	High: 85°	Low: 54°	High: 84°	Low: 60°

WSW 6-25 mph	NNW 4-16 mph	ENE→SE 2-20 mph	E→SE 3 mph	SE 6-23 mph	SE 5 mph	SSE 5-18→8-25 mph	E→NE 5-16 mph
UV: 5 Medium		UV: 5 Medium		UV: 5 Medium		UV: 5 Medium

Today	Sunny. Unusually hot. High 87°. UV index up to 5. Wind west-southwest around 6 mph, gusting to 25 mph.
Tonight	Clear. Low 52°. Wind north-northwest around 4 mph, gusting to 16 mph.
Thursday	Sunny. Unusually hot. High 82°. UV index up to 5. Wind east-northeast around 2 mph, gusting to 20 mph, in the morning, becoming southeast in the afternoon.
Thursday night	Clear. Low 51°. Wind east around 3 mph in the evening, becoming southeast after midnight.
Friday	Sunny. Unusually hot. High 85°. UV index up to 5. Wind southeast around 6 mph, gusting to 23 mph.
Friday night	Clear. Low 54°. Wind southeast around 5 mph.
Saturday	Partly cloudy. Unusually hot. High 84°. UV index up to 5. Wind south-southeast around 5 mph, gusting to 18 mph, in the morning, becoming 8 mph, gusting to 25 mph, in the afternoon.
Saturday night	Mostly cloudy in the evening, becoming partly cloudy after midnight. Light to moderate fog in the evening, then moderate fog after midnight. Rain likely. Low 60°. Wind east around 5 mph, gusting to 16 mph, in the evening, becoming northeast after midnight. Chance of precipitation 70 percent. Precipitation mostly around half an inch.
Sunday	Partly to mostly sunny in the morning, becoming sunny in the afternoon. Patchy light fog in the morning. A slight chance of rain. Warm. High 80°. UV index up to 5. Wind north-northeast around 5 mph, gusting to 25 mph, in the morning, becoming northwest in the afternoon. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Sunday night	Clear in the evening, becoming fair to partly cloudy after midnight. Patchy light fog after midnight. Low 58°. Wind south around 3 mph.
Monday	Sunny. Patchy light fog in the morning. Unusually hot. High 87°. UV index up to 5. Wind southwest around 7 mph, gusting to 21 mph.
Monday night	Fair in the evening, becoming mostly cloudy to cloudy after midnight. Mild. Low 63°. Wind southwest around 4 mph in the evening, becoming west after midnight.
Tuesday	Mostly cloudy to cloudy in the morning, becoming partly to mostly cloudy in the afternoon. A slight chance of rain. Warm. High 76°. Wind north-northwest around 7 mph, gusting to 26 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Tuesday night	Partly cloudy in the evening, becoming cloudy after midnight. Low 57°. Wind northeast around 9 mph, gusting to 22 mph, in the evening, becoming east after midnight.

WXSIM forecast formatting script by Saratoga-Weather.org.

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