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Fall is right around the corner. Read AccuWeather's U.S. fall forecast Chevron right
Days of storms, flood risk expected from Plains to mid-Atlantic. Click for details. Chevron right

St. Charles, MO

95°F
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St. Charles

Missouri

95°
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St. Charles, MO Weather
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Hourly

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6 PM

98°
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 6%
Chevron down
Partly sunny
alerts

Extreme Heat Warning

12:00 PM Sunday - 8:00 PM Wednesday

RealFeel Shade™102°

Heat Index108°

WindWSW 10 mph

Air QualityFair

Max UV Index1.8 (Low)

Wind Gusts15 mph

Humidity43%

Indoor Humidity43% (Extremely Humid)

Dew Point73° F

AccuLumen Brightness Index™8 (Bright)

Cloud Cover46%

Visibility10 mi

Cloud Ceiling30000 ft

7 PM

95°
RealFeel® 103°
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 4%
Chevron down
Partly sunny
alerts

Extreme Heat Warning

12:00 PM Sunday - 8:00 PM Wednesday

RealFeel Shade™103°

Heat Index107°

WindWSW 9 mph

Air QualityFair

Max UV Index0.8 (Low)

Wind Gusts13 mph

Humidity51%

Indoor Humidity51% (Extremely Humid)

Dew Point75° F

AccuLumen Brightness Index™4 (Dull)

Cloud Cover46%

Visibility10 mi

Cloud Ceiling30000 ft

8 PM

92°
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 0%
Chevron down
Partly sunny
alerts

Extreme Heat Warning

12:00 PM Sunday - 8:00 PM Wednesday

RealFeel Shade™97°

Heat Index101°

WindSSW 8 mph

Air QualityFair

Max UV Index0.0 (Low)

Wind Gusts12 mph

Humidity55%

Indoor Humidity55% (Extremely Humid)

Dew Point74° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover47%

Visibility10 mi

Cloud Ceiling30000 ft

9 PM

88°
RealFeel® 94°
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
Intermittent clouds
alerts

Extreme Heat Warning

12:00 PM Sunday - 8:00 PM Wednesday

Heat Index97°

WindSSW 8 mph

Air QualityFair

Wind Gusts10 mph

Humidity62%

Indoor Humidity62% (Extremely Humid)

Dew Point74° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover60%

Visibility10 mi

Cloud Ceiling30000 ft

10 PM

84°
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 0%
Chevron down
Intermittent clouds
alerts

Extreme Heat Warning

12:00 PM Sunday - 8:00 PM Wednesday

Heat Index91°

WindSSW 8 mph

Air QualityFair

Wind Gusts9 mph

Humidity70%

Indoor Humidity70% (Extremely Humid)

Dew Point74° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover65%

Visibility10 mi

Cloud Ceiling30000 ft

11 PM

82°
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 0%
Chevron down
Intermittent clouds
alerts

Extreme Heat Warning

12:00 PM Sunday - 8:00 PM Wednesday

Heat Index87°

WindSSW 8 mph

Air QualityFair

Wind Gusts9 mph

Humidity75%

Indoor Humidity75% (Extremely Humid)

Dew Point73° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover57%

Visibility10 mi

Cloud Ceiling30000 ft

Hourly Weather Forecast for St. Charles

AccuWeather's hourly forecast for St. Charles provides hour-by-hour temperatures, RealFeel® Temperature, and precipitation probability through the next 10 days. The current hour shows 98° with a RealFeel® of 104°, partly sunny with a 6% 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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World North America United States Missouri St. Charles

Weather Near St. Charles:

  • O'Fallon, MO
  • Springfield, IL
  • St. Louis, MO
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