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100-degree heat dome to set up shop over southern US. Get the forecast Chevron right

Herculaneum, MO

81°F
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Herculaneum

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Herculaneum, MO Weather
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1 PM

86°
RealFeel® 97°
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 49%
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Cloudy
alerts

Extreme Heat Warning

12:00 PM Saturday - 7:00 PM Thursday

RealFeel Shade™92°

WindS 6 mph

Air QualityFair

Max UV Index3 (Moderate)

Wind Gusts7 mph

Humidity69%

Indoor Humidity69% (Extremely Humid)

Dew Point74° F

AccuLumen Brightness Index™1 (Dark)

Cloud Cover99%

Visibility10 mi

Cloud Ceiling7100 ft

2 PM

88°
RealFeel® 104°
Very Hot
RealFeel Guide
Very Hot
101° to 107°
Caution advised. 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 49%
Chevron down
Mostly cloudy
alerts

Extreme Heat Warning

12:00 PM Saturday - 7:00 PM Thursday

RealFeel Shade™95°

WindS 6 mph

Air QualityPoor

Max UV Index7 (High)

Wind Gusts7 mph

Humidity68%

Indoor Humidity68% (Extremely Humid)

Dew Point76° F

AccuLumen Brightness Index™5 (Medium)

Cloud Cover76%

Visibility10 mi

Cloud Ceiling30000 ft

3 PM

91°
RealFeel® 106°
Very Hot
RealFeel Guide
Very Hot
101° to 107°
Caution advised. 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 49%
Chevron down
Mostly cloudy
alerts

Extreme Heat Warning

12:00 PM Saturday - 7:00 PM Thursday

RealFeel Shade™99°

WindS 6 mph

Air QualityPoor

Max UV Index6 (High)

Wind Gusts7 mph

Humidity60%

Indoor Humidity60% (Extremely Humid)

Dew Point76° F

AccuLumen Brightness Index™5 (Medium)

Cloud Cover76%

Visibility10 mi

Cloud Ceiling30000 ft

4 PM

87°
RealFeel® 100°
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 63%
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Rain
alerts

Extreme Heat Warning

12:00 PM Saturday - 7:00 PM Thursday

RealFeel Shade™95°

WindSSW 6 mph

Air QualityPoor

Max UV Index3 (Moderate)

Wind Gusts7 mph

Humidity77%

Indoor Humidity77% (Dangerously Humid)

Dew Point79° F

AccuLumen Brightness Index™5 (Medium)

Cloud Cover76%

Rain0.12 in

Visibility4 mi

Cloud Ceiling30000 ft

5 PM

88°
RealFeel® 101°
Very Hot
RealFeel Guide
Very Hot
101° to 107°
Caution advised. 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 49%
Chevron down
Mostly cloudy
alerts

Extreme Heat Warning

12:00 PM Saturday - 7:00 PM Thursday

RealFeel Shade™96°

WindSSE 6 mph

Air QualityPoor

Max UV Index3 (Moderate)

Wind Gusts7 mph

Humidity67%

Indoor Humidity67% (Extremely Humid)

Dew Point76° F

AccuLumen Brightness Index™5 (Medium)

Cloud Cover76%

Visibility10 mi

Cloud Ceiling30000 ft

6 PM

84°
RealFeel® 95°
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 74%
Chevron down
Rain
alerts

Extreme Heat Warning

12:00 PM Saturday - 7:00 PM Thursday

RealFeel Shade™92°

WindESE 6 mph

Air QualityPoor

Max UV Index1 (Low)

Wind Gusts7 mph

Humidity83%

Indoor Humidity83% (Dangerously Humid)

Dew Point79° F

AccuLumen Brightness Index™5 (Medium)

Cloud Cover76%

Rain0.12 in

Visibility4 mi

Cloud Ceiling30000 ft

7 PM

83°
RealFeel® 92°
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 74%
Chevron down
Rain
alerts

Extreme Heat Warning

12:00 PM Saturday - 7:00 PM Thursday

RealFeel Shade™92°

WindESE 6 mph

Air QualityFair

Max UV Index1 (Low)

Wind Gusts8 mph

Humidity87%

Indoor Humidity87% (Dangerously Humid)

Dew Point79° F

AccuLumen Brightness Index™3 (Dull)

Cloud Cover76%

Rain0.12 in

Visibility4 mi

Cloud Ceiling30000 ft

8 PM

82°
RealFeel® 92°
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

12:00 PM Saturday - 7:00 PM Thursday

RealFeel Shade™92°

WindESE 6 mph

Air QualityFair

Max UV Index0 (Low)

Wind Gusts15 mph

Humidity82%

Indoor Humidity82% (Extremely Humid)

Dew Point76° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover10%

Visibility10 mi

Cloud Ceiling30000 ft

9 PM

81°
RealFeel® 90°
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 1%
Chevron down
Mostly clear
alerts

Extreme Heat Warning

12:00 PM Saturday - 7:00 PM Thursday

WindESE 6 mph

Air QualityFair

Wind Gusts14 mph

Humidity85%

Indoor Humidity85% (Extremely Humid)

Dew Point76° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover10%

Visibility10 mi

Cloud Ceiling30000 ft

10 PM

79°
RealFeel® 87°
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 1%
Chevron down
Clear
alerts

Extreme Heat Warning

12:00 PM Saturday - 7:00 PM Thursday

WindESE 6 mph

Air QualityFair

Wind Gusts12 mph

Humidity89%

Indoor Humidity89% (Extremely Humid)

Dew Point75° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover7%

Visibility10 mi

Cloud Ceiling30000 ft

11 PM

76°
RealFeel® 84°
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 1%
Chevron down
Clear
alerts

Extreme Heat Warning

12:00 PM Saturday - 7:00 PM Thursday

WindSE 5 mph

Air QualityFair

Wind Gusts12 mph

Humidity96%

Indoor Humidity95% (Extremely Humid)

Dew Point75° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover4%

Visibility10 mi

Cloud Ceiling30000 ft

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World North America United States Missouri Herculaneum

Weather Near Herculaneum:

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