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: Monday, 28-Sep-2026 05:00 am

Today Sunny	Tonight Clear	Tuesday Mostly Sunny	Tuesday night Partly Cloudy	Wednesday Partly Cloudy	Wednesday night Mostly Cloudy	Thursday Chance rain	Thursday night Rain likely
						<.25 in.	1.0 in.
High: 79°	Low: 53°	High: 82°	Low: 58°	High: 86°	Low: 65°	High: 80°	Low: 65°

ENE 3-23 mph	E 2 mph	SSE 4-23 mph	SSE 5-15 mph	SSE 7-20 mph	SSE 7 mph	SSE→WSW 5-18 mph	SE→NNE 3 mph
UV: 6 High		UV: 6 High		UV: 6 High

Today	Sunny. Warm. High 79°. UV index up to 6. Wind east-northeast around 3 mph, gusting to 23 mph.
Tonight	Clear. Low 53°. Wind east around 2 mph.
Tuesday	Partly to mostly sunny in the morning, becoming mostly sunny in the afternoon. Warm. High 82°. UV index up to 6. Wind south-southeast around 4 mph, gusting to 23 mph.
Tuesday night	Partly cloudy. Low 58°. Wind south-southeast around 5 mph, gusting to 15 mph.
Wednesday	Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Unusually hot. High 86°. UV index up to 6. Wind south-southeast around 7 mph, gusting to 20 mph.
Wednesday night	Partly to mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Mild. Low 65°. Wind south-southeast around 7 mph.
Thursday	Mostly cloudy to cloudy in the morning, becoming dense overcast in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. Precipitation showery or intermittent. Warm. High 80°. Wind south-southeast around 5 mph, gusting to 18 mph, in the morning, becoming west-southwest in the afternoon. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Thursday night	Dense overcast. Patchy light fog. Rain likely. Precipitation showery or intermittent. Mild. Low 65°. Wind southeast around 3 mph in the evening, becoming north-northeast after midnight. Chance of precipitation 80 percent. Precipitation mostly around an inch.
Friday	Dense overcast. Patchy light fog. Rain likely in the morning, then a chance of rain in the afternoon. Precipitation showery or intermittent. High 68°. Wind northeast around 4 mph, gusting to 16 mph, in the morning, becoming 9 mph, gusting to 23 mph, in the afternoon. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch.
Friday night	Mostly cloudy to cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog after midnight. A slight chance of rain. Low 58°. Wind northeast around 7 mph, gusting to 22 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Saturday	Partly to mostly cloudy. Light to moderate fog in the morning. High 72°. UV index up to 4. Wind northeast around 5 mph, gusting to 22 mph.
Saturday night	Mostly cloudy in the evening, becoming cloudy after midnight. Low 59°. Wind east-northeast around 2 mph, gusting to 18 mph, in the evening, becoming west-northwest after midnight.
Sunday	Cloudy in the morning, becoming partly to mostly sunny in the afternoon. High 72°. UV index up to 4. Wind north-northwest around 4 mph in the morning, becoming 8 mph, gusting to 20 mph, in the afternoon.
Sunday night	Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. Low 56°. Wind north-northwest around 6 mph, gusting to 17 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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