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: Tuesday, 06-Oct-2026 05:00 am

Today Sunny	Tonight Clear	Wednesday Sunny	Wednesday night Mostly Clear	Thursday Mostly Sunny	Thursday night Mostly Clear	Friday Mostly Sunny	Friday night Clear

High: 76°	Low: 48°	High: 81°	Low: 50°	High: 79°	Low: 49°	High: 82°	Low: 53°

S 4-22 mph	S 4 mph	WSW 7-22 mph	NW→N 3 mph	N 3-19 mph	NE→E 4 mph	SE 6-24 mph	SSE 6-15 mph
UV: 5 Medium		UV: 5 Medium		UV: 4 Medium		UV: 5 Medium

Today	Sunny. Warm. High 76°. UV index up to 5. Wind south around 4 mph, gusting to 22 mph.
Tonight	Clear. Low 48°. Wind south around 4 mph.
Wednesday	Sunny. Warm. High 81°. UV index up to 5. Wind west-southwest around 7 mph, gusting to 22 mph.
Wednesday night	Mostly clear in the evening, becoming fair after midnight. Low 50°. Wind northwest around 3 mph in the evening, becoming north after midnight.
Thursday	Mostly sunny in the morning, becoming partly to mostly sunny in the afternoon. Warm. High 79°. UV index up to 4. Wind north around 3 mph, gusting to 19 mph.
Thursday night	Clear in the evening, becoming mostly clear after midnight. Low 49°. Wind northeast around 4 mph in the evening, becoming east after midnight.
Friday	Mostly sunny in the morning, becoming sunny in the afternoon. Unusually hot. High 82°. UV index up to 5. Wind southeast around 6 mph, gusting to 24 mph.
Friday night	Clear. Low 53°. Wind south-southeast around 6 mph, gusting to 15 mph.
Saturday	Sunny in the morning, becoming mostly sunny in the afternoon. Unusually hot. High 87°. UV index up to 5. Wind south-southeast around 6 mph, gusting to 19 mph, in the morning, becoming 10 mph, gusting to 25 mph, in the afternoon.
Saturday night	Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. A slight chance of rain after midnight. Low 61°. Wind south-southeast around 5 mph, gusting to 17 mph, in the evening, becoming east-southeast after midnight. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Sunday	Mostly cloudy to cloudy in the morning, becoming partly cloudy in the afternoon. A chance of rain in the morning, then a slight chance of rain in the afternoon. Warm. High 77°. UV index up to 5. Wind northeast around 7 mph, gusting to 26 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Sunday night	Mostly clear in the evening, becoming clear after midnight. Patchy light fog. Low 56°. Wind northwest around 3 mph, gusting to 21 mph, in the evening, becoming west after midnight.
Monday	Mostly sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. Warm. High 78°. Wind northwest near calm in the morning, becoming east in the afternoon.
Monday night	Clear. Patchy light fog after midnight. Low 56°. Wind south-southeast around 2 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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