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Dangerous heat wave to expand east early this week, affecting 170 million people. Details here Chevron right

O'Fallon, MO

96°F
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O'Fallon

Missouri

96°
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O'Fallon, MO Weather
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6 PM

94°
RealFeel® 98°
Hot
RealFeel Guide
Hot
90° to 100°
Caution advised. Possible danger of dehydration, heat stroke, heat exhaustion and heat cramps if outside for extended periods, and especially while doing strenuous activities.
LEARN MORE
rain drop 6%
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Sunny
alerts

Extreme Heat Warning

8:00 PM Saturday - 9:00 PM Monday

RealFeel Shade™96°

WindS 9 mph

Air QualityPoor

Max UV Index2 (Low)

Wind Gusts16 mph

Humidity45%

Indoor Humidity45% (Very Humid)

Dew Point70° F

AccuLumen Brightness Index™9 (Very Bright)

Cloud Cover9%

Visibility10 mi

Cloud Ceiling33400 ft

7 PM

92°
RealFeel® 96°
Hot
RealFeel Guide
Hot
90° to 100°
Caution advised. Possible danger of dehydration, heat stroke, heat exhaustion and heat cramps if outside for extended periods, and especially while doing strenuous activities.
LEARN MORE
rain drop 4%
Chevron down
Mostly sunny
alerts

Extreme Heat Warning

8:00 PM Saturday - 9:00 PM Monday

RealFeel Shade™95°

WindS 8 mph

Air QualityPoor

Max UV Index1 (Low)

Wind Gusts14 mph

Humidity49%

Indoor Humidity49% (Very Humid)

Dew Point71° F

AccuLumen Brightness Index™7 (Bright)

Cloud Cover10%

Visibility10 mi

Cloud Ceiling30000 ft

8 PM

90°
RealFeel® 93°
Hot
RealFeel Guide
Hot
90° to 100°
Caution advised. Possible danger of dehydration, heat stroke, heat exhaustion and heat cramps if outside for extended periods, and especially while doing strenuous activities.
LEARN MORE
rain drop 0%
Chevron down
Sunny
alerts

Extreme Heat Warning

8:00 PM Saturday - 9:00 PM Monday

RealFeel Shade™93°

WindS 8 mph

Air QualityPoor

Max UV Index0 (Low)

Wind Gusts20 mph

Humidity53%

Indoor Humidity53% (Very Humid)

Dew Point71° F

AccuLumen Brightness Index™2 (Dark)

Cloud Cover4%

Visibility10 mi

Cloud Ceiling30000 ft

9 PM

87°
RealFeel® 91°
Hot
RealFeel Guide
Hot
90° to 100°
Caution advised. Possible danger of dehydration, heat stroke, heat exhaustion and heat cramps if outside for extended periods, and especially while doing strenuous activities.
LEARN MORE
rain drop 0%
Chevron down
Clear
alerts

Heat Advisory

9:00 PM Monday - 9:00 PM Thursday

WindS 7 mph

Air QualityPoor

Wind Gusts16 mph

Humidity60%

Indoor Humidity60% (Extremely Humid)

Dew Point72° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover4%

Visibility10 mi

Cloud Ceiling30000 ft

10 PM

85°
RealFeel® 89°
Very Warm
RealFeel Guide
Very Warm
82° to 89°
Older adults, infants, and those with sensitive medical conditions should minimize outdoor activity, especially in the sunshine.
LEARN MORE
rain drop 0%
Chevron down
Clear
alerts

Heat Advisory

9:00 PM Monday - 9:00 PM Thursday

WindS 7 mph

Air QualityPoor

Wind Gusts14 mph

Humidity65%

Indoor Humidity65% (Extremely Humid)

Dew Point72° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover4%

Visibility10 mi

Cloud Ceiling30000 ft

11 PM

83°
RealFeel® 88°
Very Warm
RealFeel Guide
Very Warm
82° to 89°
Older adults, infants, and those with sensitive medical conditions should minimize outdoor activity, especially in the sunshine.
LEARN MORE
rain drop 0%
Chevron down
Clear
alerts

Heat Advisory

9:00 PM Monday - 9:00 PM Thursday

WindS 6 mph

Air QualityPoor

Wind Gusts14 mph

Humidity70%

Indoor Humidity70% (Extremely Humid)

Dew Point72° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover3%

Visibility10 mi

Cloud Ceiling30000 ft

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Weather Near O'Fallon:

  • O'Fallon, MO
  • St. Charles, MO
  • St. Louis, MO
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