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, 21-Oct-2026 05:00 am

Today Partly Cloudy	Tonight Partly Cloudy	Thursday Mostly Sunny	Thursday night Clear	Friday Sunny	Friday night Mostly Clear	Saturday Partly Cloudy	Saturday night Partly Cloudy

High: 74°	Low: 49°	High: 75°	Low: 48°	High: 75°	Low: 49°	High: 75°	Low: 50°

SSW 2-19 mph	SSW→W calm	E 1-19 mph	SE 2 mph	SE 4-23 mph	SE 4 mph	SE 4-23 mph	SE 3 mph
UV: 5 Medium		UV: 5 Medium		UV: 4 Medium

Today	Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Warm. High 74°. UV index up to 5. Wind south-southwest around 2 mph, gusting to 19 mph.
Tonight	Fair in the evening, becoming fair to partly cloudy after midnight. Low 49°. Wind south-southwest near calm in the evening, becoming west after midnight.
Thursday	Mostly sunny. Warm. High 75°. UV index up to 5. Wind east around 1 mph, gusting to 19 mph.
Thursday night	Fair in the evening, becoming clear after midnight. Low 48°. Wind southeast around 2 mph.
Friday	Sunny. Warm. High 75°. UV index up to 4. Wind southeast around 4 mph, gusting to 23 mph.
Friday night	Mostly clear. Low 49°. Wind southeast around 4 mph.
Saturday	Partly cloudy. Warm. High 75°. Wind southeast around 4 mph, gusting to 23 mph.
Saturday night	Partly cloudy. Low 50°. Wind southeast around 3 mph.
Sunday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Warm. High 75°. Wind south around 3 mph, gusting to 17 mph.
Sunday night	Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Low 49°. Wind south around 4 mph.
Monday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Warm. High 74°. Wind south around 4 mph, gusting to 21 mph.
Monday night	Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. Low 50°. Wind south around 3 mph in the evening, becoming west after midnight.
Tuesday	Cloudy in the morning, becoming dense overcast in the afternoon. A chance of rain. High 61°. Wind north-northwest around 4 mph in the morning, becoming north-northeast near calm in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Tuesday night	Mostly cloudy to cloudy in the evening, becoming mostly cloudy after midnight. Low 50°. Wind east near calm in the evening, becoming north-northwest after midnight.

WXSIM forecast formatting script by Saratoga-Weather.org.

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