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Over 250 million face dangerous heat dome into 4th of July weekend. Click for details. Chevron right
Where will there be storms into 4th of July weekend? Click for the forecast. Chevron right

Union, MO

90°F
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Union, MO Weather
Today WinterCast Local {stormName} Tracker Hourly 10-Day Radar MinuteCast® Monthly Air Quality Health & Activities

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1 PM

92°
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.
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rain drop 0%
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Mostly sunny
alerts

Extreme Heat Warning

12:00 PM Sunday - 10:00 PM Friday

RealFeel Shade™95°

Heat Index99°

WindSW 7 mph

Air QualityPoor

Max UV Index11.1 (Extreme)

Wind Gusts14 mph

Humidity53%

Indoor Humidity53% (Extremely Humid)

Dew Point72° F

AccuLumen Brightness Index™9 (Very Bright)

Cloud Cover11%

Visibility10 mi

Cloud Ceiling30000 ft

2 PM

93°
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 0%
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Mostly sunny
alerts

Extreme Heat Warning

12:00 PM Sunday - 10:00 PM Friday

RealFeel Shade™97°

Heat Index101°

WindSW 8 mph

Air QualityPoor

Max UV Index10.1 (Very High)

Wind Gusts16 mph

Humidity50%

Indoor Humidity50% (Extremely Humid)

Dew Point72° F

AccuLumen Brightness Index™9 (Very Bright)

Cloud Cover11%

Visibility10 mi

Cloud Ceiling30000 ft

3 PM

94°
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 0%
Chevron down
Mostly sunny
alerts

Extreme Heat Warning

12:00 PM Sunday - 10:00 PM Friday

RealFeel Shade™98°

Heat Index102°

WindSSW 8 mph

Air QualityPoor

Max UV Index7.6 (Very High)

Wind Gusts17 mph

Humidity48%

Indoor Humidity48% (Extremely Humid)

Dew Point72° F

AccuLumen Brightness Index™9 (Very Bright)

Cloud Cover11%

Visibility10 mi

Cloud Ceiling30000 ft

4 PM

95°
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 0%
Chevron down
Mostly sunny
alerts

Extreme Heat Warning

12:00 PM Sunday - 10:00 PM Friday

RealFeel Shade™99°

Heat Index103°

WindSSW 8 mph

Air QualityPoor

Max UV Index4.9 (Moderate)

Wind Gusts18 mph

Humidity46%

Indoor Humidity46% (Very Humid)

Dew Point71° F

AccuLumen Brightness Index™9 (Very Bright)

Cloud Cover11%

Visibility10 mi

Cloud Ceiling30000 ft

5 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.
LEARN MORE
rain drop 0%
Chevron down
Mostly sunny
alerts

Extreme Heat Warning

12:00 PM Sunday - 10:00 PM Friday

RealFeel Shade™98°

Heat Index102°

WindSSW 7 mph

Air QualityPoor

Max UV Index3.4 (Moderate)

Wind Gusts16 mph

Humidity49%

Indoor Humidity49% (Extremely Humid)

Dew Point72° F

AccuLumen Brightness Index™9 (Very Bright)

Cloud Cover11%

Visibility10 mi

Cloud Ceiling30000 ft

6 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 0%
Chevron down
Mostly sunny
alerts

Extreme Heat Warning

12:00 PM Sunday - 10:00 PM Friday

RealFeel Shade™98°

Heat Index102°

WindSSW 6 mph

Air QualityPoor

Max UV Index2.2 (Low)

Wind Gusts14 mph

Humidity55%

Indoor Humidity55% (Extremely Humid)

Dew Point74° F

AccuLumen Brightness Index™9 (Very Bright)

Cloud Cover11%

Visibility10 mi

Cloud Ceiling30000 ft

7 PM

90°
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 0%
Chevron down
Mostly sunny
alerts

Extreme Heat Warning

12:00 PM Sunday - 10:00 PM Friday

RealFeel Shade™97°

Heat Index101°

WindSSW 6 mph

Air QualityPoor

Max UV Index1.2 (Low)

Wind Gusts12 mph

Humidity61%

Indoor Humidity61% (Extremely Humid)

Dew Point75° F

AccuLumen Brightness Index™7 (Bright)

Cloud Cover11%

Visibility10 mi

Cloud Ceiling30000 ft

8 PM

87°
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 0%
Chevron down
Mostly sunny
alerts

Extreme Heat Warning

12:00 PM Sunday - 10:00 PM Friday

RealFeel Shade™96°

Heat Index97°

WindS 6 mph

Air QualityPoor

Max UV Index0.3 (Low)

Wind Gusts12 mph

Humidity66%

Indoor Humidity66% (Extremely Humid)

Dew Point75° F

AccuLumen Brightness Index™2 (Dark)

Cloud Cover11%

Visibility10 mi

Cloud Ceiling30000 ft

9 PM

84°
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
Mostly clear
alerts

Extreme Heat Warning

12:00 PM Sunday - 10:00 PM Friday

Heat Index92°

WindS 6 mph

Air QualityPoor

Wind Gusts10 mph

Humidity71%

Indoor Humidity71% (Extremely Humid)

Dew Point74° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover11%

Visibility10 mi

Cloud Ceiling30000 ft

10 PM

82°
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
Mostly clear
alerts

Extreme Heat Warning

12:00 PM Sunday - 10:00 PM Friday

Heat Index87°

WindSSE 6 mph

Air QualityPoor

Wind Gusts9 mph

Humidity76%

Indoor Humidity76% (Extremely Humid)

Dew Point73° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover11%

Visibility10 mi

Cloud Ceiling30000 ft

11 PM

79°
RealFeel® 85°
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
Mostly clear
alerts

Extreme Heat Warning

12:00 PM Sunday - 10:00 PM Friday

Heat Index80°

WindS 6 mph

Air QualityPoor

Wind Gusts9 mph

Humidity82%

Indoor Humidity82% (Extremely Humid)

Dew Point73° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover11%

Visibility10 mi

Cloud Ceiling30000 ft

Hourly Weather Forecast for Union

AccuWeather's hourly forecast for Union provides hour-by-hour temperatures, RealFeel® Temperature, and precipitation probability through the next 10 days. The current hour shows 92° with a RealFeel® of 106°, mostly sunny with a 0% 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 Union:

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