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, 16-Oct-2026 05:00 am

Today Mostly Cloudy	Tonight Partly Cloudy	Saturday Mostly Sunny	Saturday night Clear	Sunday Sunny	Sunday night Clear	Monday Sunny	Monday night Partly Cloudy
<.1 in.
High: 62°	Low: 48°	High: 64°	Low: 44°	High: 71°	Low: 47°	High: 74°	Low: 48°

NW 14-32 mph	NW 12-29→8-26 mph	N 5-25 mph	ESE calm	SSE 5-26 mph	SSE 2-19 mph	SSE 2-23 mph	ESE 1-16 mph
		UV: 4 Medium		UV: 5 Medium		UV: 4 Medium

Today	Partly to mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. A chance of rain. Breezy. High 62°. Wind northwest around 14 mph, gusting to 32 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Tonight	Partly to mostly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 48°. Wind northwest around 12 mph, gusting to 29 mph, in the evening, becoming 8 mph, gusting to 26 mph, after midnight.
Saturday	Mostly sunny. High 64°. UV index up to 4. Wind north around 5 mph, gusting to 25 mph.
Saturday night	Fair in the evening, becoming clear after midnight. Low 44°. Wind east-southeast near calm.
Sunday	Sunny. Mild. High 71°. UV index up to 5. Wind south-southeast around 5 mph, gusting to 26 mph.
Sunday night	Clear. Low 47°. Wind south-southeast around 2 mph, gusting to 19 mph.
Monday	Sunny. Warm. High 74°. UV index up to 4. Wind south-southeast around 2 mph, gusting to 23 mph.
Monday night	Fair to partly cloudy in the evening, becoming fair after midnight. Low 48°. Wind east-southeast around 1 mph, gusting to 16 mph.
Tuesday	Partly cloudy. Warm. High 73°. Wind southeast around 3 mph, gusting to 22 mph.
Tuesday night	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 50°. Wind east-southeast around 2 mph, gusting to 16 mph.
Wednesday	Partly cloudy in the morning, becoming sunny in the afternoon. Warm. High 75°. UV index up to 5. Wind southeast around 4 mph, gusting to 22 mph.
Wednesday night	Clear in the evening, becoming fair to partly cloudy after midnight. Low 48°. Wind southeast around 3 mph.
Thursday	Mostly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Warm. High 77°. Wind south around 3 mph, gusting to 20 mph.
Thursday night	Mostly cloudy. Low 53°. Wind southeast around 3 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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