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Hottest day yet as heat wave intensifies in the eastern US. Click for the forecast.

4th of July forecast: Where will storms disrupt outdoor plans?

St. Charles, MO

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St. Charles, MO Weather

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5 PM

97°

RealFeel® 110°

Dangerous Heat

RealFeel Guide

Dangerous Heat

108° to 115°

Caution advised. Danger of dehydration, heat stroke, heat exhaustion and heat cramps if outside for extended periods, and especially while doing strenuous activities.

7%

Hazy sunshine

Extreme Heat Warning

12:00 PM Sunday - 8:00 PM Saturday

RealFeel Shade™105°

Heat Index111°

WindS 8 mph

Air QualityFair

Max UV Index3.4 (Moderate)

Wind Gusts14 mph

Humidity51%

Indoor Humidity51% (Extremely Humid)

Dew Point76° F

AccuLumen Brightness Index™8 (Bright)

Cloud Cover52%

Visibility5 mi

Cloud Ceiling33000 ft

6 PM

94°

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.

7%

Hazy sunshine

Extreme Heat Warning

12:00 PM Sunday - 8:00 PM Saturday

RealFeel Shade™100°

Heat Index105°

WindSSE 8 mph

Air QualityFair

Max UV Index2.0 (Low)

Wind Gusts13 mph

Humidity52%

Indoor Humidity52% (Extremely Humid)

Dew Point74° F

AccuLumen Brightness Index™6 (Medium)

Cloud Cover65%

Visibility5 mi

Cloud Ceiling30000 ft

7 PM

92°

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.

6%

Hazy sunshine

Extreme Heat Warning

12:00 PM Sunday - 8:00 PM Saturday

RealFeel Shade™96°

Heat Index100°

WindSSE 8 mph

Air QualityFair

Max UV Index1.1 (Low)

Wind Gusts12 mph

Humidity55%

Indoor Humidity55% (Extremely Humid)

Dew Point73° F

AccuLumen Brightness Index™5 (Medium)

Cloud Cover65%

Visibility5 mi

Cloud Ceiling30000 ft

8 PM

89°

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.

4%

Partly sunny

Extreme Heat Warning

12:00 PM Sunday - 8:00 PM Saturday

RealFeel Shade™95°

Heat Index98°

WindSSE 8 mph

Air QualityFair

Max UV Index0.3 (Low)

Wind Gusts10 mph

Humidity60%

Indoor Humidity60% (Extremely Humid)

Dew Point74° F

AccuLumen Brightness Index™2 (Dark)

Cloud Cover45%

Visibility10 mi

Cloud Ceiling30000 ft

9 PM

87°

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.

4%

Partly cloudy

Extreme Heat Warning

12:00 PM Sunday - 8:00 PM Saturday

Heat Index95°

WindSSE 7 mph

Air QualityFair

Wind Gusts10 mph

Humidity66%

Indoor Humidity66% (Extremely Humid)

Dew Point74° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover40%

Visibility10 mi

Cloud Ceiling30000 ft

10 PM

84°

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.

4%

Mostly clear

Extreme Heat Warning

12:00 PM Sunday - 8:00 PM Saturday

Heat Index92°

WindS 7 mph

Air QualityFair

Wind Gusts9 mph

Humidity73%

Indoor Humidity73% (Extremely Humid)

Dew Point75° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover26%

Visibility10 mi

Cloud Ceiling30000 ft

11 PM

82°

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.

4%

Mostly clear

Extreme Heat Warning

12:00 PM Sunday - 8:00 PM Saturday

Heat Index89°

WindS 7 mph

Air QualityFair

Wind Gusts8 mph

Humidity79%

Indoor Humidity79% (Extremely Humid)

Dew Point75° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover26%

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 97° with a RealFeel® of 110°, hazy sunshine with a 7% 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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