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O'Fallon, MO

75°F
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O'Fallon

Missouri

75°
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O'Fallon, MO Weather
Today WinterCast Local {stormName} Tracker Hourly 10-Day Radar MinuteCast® Monthly Air Quality Health & Activities

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3 PM

75°
RealFeel® 80°
Pleasant
RealFeel Guide
Pleasant
63° to 81°
Most consider this temperature range ideal.
LEARN MORE
rain drop 62%
Chevron down
Mostly cloudy w/ t-storms
alerts

Flood Watch

7:00 AM Sunday - 1:00 AM Monday
alerts

Flood Advisory

1:10 PM Sunday - 5:00 PM Sunday

RealFeel Shade™75°

WindS 12 mph

Air QualityPoor

Max UV Index3.7 (Moderate)

Wind Gusts15 mph

Humidity89%

Indoor Humidity89% (Extremely Humid)

Dew Point72° F

AccuLumen Brightness Index™6 (Medium)

Cloud Cover71%

Rain0.05 in

Visibility10 mi

Cloud Ceiling9500 ft

4 PM

77°
RealFeel® 80°
Pleasant
RealFeel Guide
Pleasant
63° to 81°
Most consider this temperature range ideal.
LEARN MORE
rain drop 49%
Chevron down
Cloudy
alerts

Flood Watch

7:00 AM Sunday - 1:00 AM Monday
alerts

Flood Advisory

1:10 PM Sunday - 5:00 PM Sunday

RealFeel Shade™78°

WindSSE 13 mph

Air QualityPoor

Max UV Index1.5 (Low)

Wind Gusts16 mph

Humidity82%

Indoor Humidity82% (Very Humid)

Dew Point71° F

AccuLumen Brightness Index™1 (Dark)

Cloud Cover95%

Visibility10 mi

Cloud Ceiling5700 ft

5 PM

77°
RealFeel® 80°
Pleasant
RealFeel Guide
Pleasant
63° to 81°
Most consider this temperature range ideal.
LEARN MORE
rain drop 49%
Chevron down
Cloudy
alerts

Flood Watch

7:00 AM Sunday - 1:00 AM Monday

RealFeel Shade™79°

WindSSE 12 mph

Air QualityPoor

Max UV Index1.0 (Low)

Wind Gusts16 mph

Humidity83%

Indoor Humidity83% (Very Humid)

Dew Point71° F

AccuLumen Brightness Index™1 (Dark)

Cloud Cover95%

Visibility10 mi

Cloud Ceiling4800 ft

6 PM

76°
RealFeel® 75°
Pleasant
RealFeel Guide
Pleasant
63° to 81°
Most consider this temperature range ideal.
LEARN MORE
rain drop 70%
Chevron down
Thunderstorms
alerts

Flood Watch

7:00 AM Sunday - 1:00 AM Monday

RealFeel Shade™75°

WindWNW 10 mph

Air QualityFair

Max UV Index0.5 (Low)

Wind Gusts15 mph

Humidity84%

Indoor Humidity84% (Very Humid)

Dew Point71° F

AccuLumen Brightness Index™1 (Dark)

Cloud Cover95%

Rain0.15 in

Visibility4 mi

Cloud Ceiling2000 ft

7 PM

76°
RealFeel® 75°
Pleasant
RealFeel Guide
Pleasant
63° to 81°
Most consider this temperature range ideal.
LEARN MORE
rain drop 70%
Chevron down
Thunderstorms
alerts

Flood Watch

7:00 AM Sunday - 1:00 AM Monday

RealFeel Shade™75°

WindNW 9 mph

Air QualityFair

Max UV Index0.3 (Low)

Wind Gusts12 mph

Humidity84%

Indoor Humidity84% (Very Humid)

Dew Point71° F

AccuLumen Brightness Index™1 (Dark)

Cloud Cover95%

Rain0.15 in

Visibility4 mi

Cloud Ceiling2000 ft

8 PM

75°
RealFeel® 73°
Pleasant
RealFeel Guide
Pleasant
63° to 81°
Most consider this temperature range ideal.
LEARN MORE
rain drop 51%
Chevron down
Thunderstorms
alerts

Flood Watch

7:00 AM Sunday - 1:00 AM Monday

RealFeel Shade™73°

WindSW 13 mph

Air QualityFair

Max UV Index0.1 (Low)

Wind Gusts14 mph

Humidity85%

Indoor Humidity85% (Very Humid)

Dew Point70° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover93%

Rain0.13 in

Visibility4 mi

Cloud Ceiling2300 ft

9 PM

74°
RealFeel® 75°
Pleasant
RealFeel Guide
Pleasant
63° to 81°
Most consider this temperature range ideal.
LEARN MORE
rain drop 47%
Chevron down
Cloudy
alerts

Flood Watch

7:00 AM Sunday - 1:00 AM Monday

WindW 12 mph

Air QualityFair

Wind Gusts13 mph

Humidity86%

Indoor Humidity86% (Very Humid)

Dew Point70° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover90%

Visibility10 mi

Cloud Ceiling1700 ft

10 PM

72°
RealFeel® 72°
Pleasant
RealFeel Guide
Pleasant
63° to 81°
Most consider this temperature range ideal.
LEARN MORE
rain drop 39%
Chevron down
Cloudy
alerts

Flood Watch

7:00 AM Sunday - 1:00 AM Monday

WindWNW 12 mph

Air QualityFair

Wind Gusts13 mph

Humidity89%

Indoor Humidity89% (Very Humid)

Dew Point69° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover90%

Visibility10 mi

Cloud Ceiling1100 ft

11 PM

71°
RealFeel® 70°
Pleasant
RealFeel Guide
Pleasant
63° to 81°
Most consider this temperature range ideal.
LEARN MORE
rain drop 32%
Chevron down
Cloudy
alerts

Flood Watch

7:00 AM Sunday - 1:00 AM Monday

WindWNW 12 mph

Air QualityFair

Wind Gusts12 mph

Humidity89%

Indoor Humidity89% (Very Humid)

Dew Point67° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover92%

Visibility10 mi

Cloud Ceiling800 ft

Hourly Weather Forecast for O'Fallon

AccuWeather's hourly forecast for O'Fallon provides hour-by-hour temperatures, RealFeel® Temperature, and precipitation probability through the next 10 days. The current hour shows 75° with a RealFeel® of 80°, mostly cloudy w/ t-storms with a 62% chance of precipitation. Each hourly forecast includes wind speed, humidity, air quality, UV index, and the AccuLumen Brightness Index™, AccuWeather's measure of perceived outdoor light intensity. Forecasts are generated by proprietary systems developed by AccuWeather meteorologists since 1962.

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Weather Near O'Fallon:

  • St. Charles, MO
  • St. Louis, MO
  • St. Peters, MO
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