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Heat dome collapse to spark thunderstorms. Get the forecast. Chevron right

St. John, MO

86°F
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St. John

Missouri

86°
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St. John, MO Weather
Today WinterCast Local {stormName} Tracker Hourly 10-Day Radar MinuteCast® Monthly Air Quality Health & Activities

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3 PM

92°
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
Intermittent clouds
alerts

Flash Flood Warning

2:26 PM Saturday - 5:30 PM Saturday
alerts

Severe Thunderstorm Watch

1:41 PM Saturday - 7:00 PM Saturday
alerts

Extreme Heat Warning

12:00 PM Sunday - 8:00 PM Saturday

RealFeel Shade™98°

Heat Index102°

WindWNW 8 mph

Air QualityFair

Max UV Index4.7 (Moderate)

Wind Gusts12 mph

Humidity57%

Indoor Humidity57% (Extremely Humid)

Dew Point75° F

AccuLumen Brightness Index™6 (Medium)

Cloud Cover70%

Visibility10 mi

Cloud Ceiling14700 ft

4 PM

92°
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
Intermittent clouds
alerts

Flash Flood Warning

2:26 PM Saturday - 5:30 PM Saturday
alerts

Severe Thunderstorm Watch

1:41 PM Saturday - 7:00 PM Saturday
alerts

Extreme Heat Warning

12:00 PM Sunday - 8:00 PM Saturday

RealFeel Shade™97°

Heat Index101°

WindNNW 8 mph

Air QualityFair

Max UV Index3.1 (Moderate)

Wind Gusts16 mph

Humidity53%

Indoor Humidity53% (Extremely Humid)

Dew Point73° F

AccuLumen Brightness Index™6 (Medium)

Cloud Cover70%

Visibility10 mi

Cloud Ceiling14700 ft

5 PM

90°
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 54%
Chevron down
Mostly cloudy w/ t-storms
alerts

Flash Flood Warning

2:26 PM Saturday - 5:30 PM Saturday
alerts

Severe Thunderstorm Watch

1:41 PM Saturday - 7:00 PM Saturday
alerts

Extreme Heat Warning

12:00 PM Sunday - 8:00 PM Saturday

RealFeel Shade™95°

Heat Index104°

WindSSE 8 mph

Air QualityFair

Max UV Index1.0 (Low)

Wind Gusts13 mph

Humidity67%

Indoor Humidity67% (Dangerously Humid)

Dew Point78° F

AccuLumen Brightness Index™6 (Medium)

Cloud Cover70%

Rain0.26 in

Visibility3 mi

Cloud Ceiling2000 ft

6 PM

87°
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 49%
Chevron down
Intermittent clouds
alerts

Severe Thunderstorm Watch

1:41 PM Saturday - 7:00 PM Saturday
alerts

Extreme Heat Warning

12:00 PM Sunday - 8:00 PM Saturday

RealFeel Shade™92°

Heat Index95°

WindSSE 8 mph

Air QualityFair

Max UV Index1.6 (Low)

Wind Gusts12 mph

Humidity62%

Indoor Humidity62% (Extremely Humid)

Dew Point73° F

AccuLumen Brightness Index™6 (Medium)

Cloud Cover70%

Visibility10 mi

Cloud Ceiling21500 ft

7 PM

85°
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 45%
Chevron down
Intermittent clouds
alerts

Extreme Heat Warning

12:00 PM Sunday - 8:00 PM Saturday

RealFeel Shade™91°

Heat Index92°

WindSSE 8 mph

Air QualityFair

Max UV Index0.9 (Low)

Wind Gusts9 mph

Humidity67%

Indoor Humidity67% (Extremely Humid)

Dew Point73° F

AccuLumen Brightness Index™4 (Dull)

Cloud Cover70%

Visibility10 mi

Cloud Ceiling24900 ft

8 PM

81°
RealFeel® 86°
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 47%
Chevron down
Cloudy

RealFeel Shade™86°

Heat Index86°

WindE 7 mph

Air QualityFair

Max UV Index0.1 (Low)

Wind Gusts8 mph

Humidity74%

Indoor Humidity74% (Extremely Humid)

Dew Point72° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover95%

Visibility10 mi

Cloud Ceiling4000 ft

9 PM

78°
RealFeel® 80°
Pleasant
RealFeel Guide
Pleasant
63° to 81°
Most consider this temperature range ideal.
LEARN MORE
rain drop 51%
Chevron down
Thunderstorms

WindSE 6 mph

Air QualityFair

Wind Gusts8 mph

Humidity84%

Indoor Humidity84% (Extremely Humid)

Dew Point72° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover98%

Rain0.07 in

Visibility5 mi

Cloud Ceiling4000 ft

10 PM

76°
RealFeel® 81°
Pleasant
RealFeel Guide
Pleasant
63° to 81°
Most consider this temperature range ideal.
LEARN MORE
rain drop 47%
Chevron down
Cloudy

WindS 6 mph

Air QualityFair

Wind Gusts7 mph

Humidity87%

Indoor Humidity87% (Extremely Humid)

Dew Point72° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover90%

Visibility10 mi

Cloud Ceiling30000 ft

11 PM

76°
RealFeel® 81°
Pleasant
RealFeel Guide
Pleasant
63° to 81°
Most consider this temperature range ideal.
LEARN MORE
rain drop 34%
Chevron down
Intermittent clouds

WindS 6 mph

Air QualityFair

Wind Gusts7 mph

Humidity88%

Indoor Humidity88% (Extremely Humid)

Dew Point72° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover67%

Visibility10 mi

Cloud Ceiling30000 ft

Hourly Weather Forecast for St. John

AccuWeather's hourly forecast for St. John provides hour-by-hour temperatures, RealFeel® Temperature, and precipitation probability through the next 10 days. The current hour shows 92° with a RealFeel® of 104°, intermittent clouds with a 49% 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 St. John:

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