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Hottest day yet as heat wave intensifies in the eastern US. Click for the forecast. Chevron right
4th of July forecast: Where will storms disrupt outdoor plans? Chevron right

Key Biscayne, FL

82°F
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Key Biscayne

Florida

82°
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Key Biscayne, FL Weather
Today WinterCast Local {stormName} Tracker Hourly 10-Day Radar MinuteCast® Monthly Air Quality Health & Activities

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4 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 53%
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Thunderstorms

RealFeel Shade™89°

Heat Index91°

WindESE 8 mph

Air QualityFair

Max UV Index1.7 (Low)

Wind Gusts12 mph

Humidity72%

Indoor Humidity72% (Extremely Humid)

Dew Point74° F

AccuLumen Brightness Index™3 (Dull)

Cloud Cover87%

Visibility10 mi

Cloud Ceiling7100 ft

5 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 51%
Chevron down
Mostly cloudy w/ t-storms

RealFeel Shade™90°

Heat Index93°

WindESE 8 mph

Air QualityFair

Max UV Index1.1 (Low)

Wind Gusts10 mph

Humidity83%

Indoor Humidity83% (Dangerously Humid)

Dew Point78° F

AccuLumen Brightness Index™6 (Medium)

Cloud Cover70%

Rain0.05 in

Visibility5 mi

Cloud Ceiling2000 ft

6 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 47%
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Intermittent clouds

RealFeel Shade™92°

Heat Index90°

WindESE 7 mph

Air QualityExcellent

Max UV Index1.0 (Low)

Wind Gusts8 mph

Humidity80%

Indoor Humidity80% (Extremely Humid)

Dew Point76° F

AccuLumen Brightness Index™6 (Medium)

Cloud Cover70%

Visibility10 mi

Cloud Ceiling7100 ft

7 PM

81°
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 49%
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Intermittent clouds

RealFeel Shade™92°

Heat Index88°

WindSE 6 mph

Air QualityExcellent

Max UV Index0.3 (Low)

Wind Gusts7 mph

Humidity88%

Indoor Humidity88% (Extremely Humid)

Dew Point77° F

AccuLumen Brightness Index™3 (Dull)

Cloud Cover70%

Visibility10 mi

Cloud Ceiling2000 ft

8 PM

83°
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 75%
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Showers

RealFeel Shade™88°

Heat Index91°

WindESE 7 mph

Air QualityExcellent

Max UV Index0.0 (Low)

Wind Gusts7 mph

Humidity79%

Indoor Humidity79% (Extremely Humid)

Dew Point76° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover90%

Rain0.03 in

Visibility6 mi

Cloud Ceiling4000 ft

9 PM

83°
RealFeel® 89°
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 75%
Chevron down
Showers

Heat Index91°

WindESE 6 mph

Air QualityExcellent

Wind Gusts7 mph

Humidity79%

Indoor Humidity79% (Extremely Humid)

Dew Point76° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover82%

Rain0.03 in

Visibility6 mi

Cloud Ceiling4000 ft

10 PM

83°
RealFeel® 89°
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 75%
Chevron down
Mostly cloudy w/ showers

Heat Index91°

WindESE 6 mph

Air QualityExcellent

Wind Gusts6 mph

Humidity79%

Indoor Humidity79% (Extremely Humid)

Dew Point76° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover73%

Rain0.03 in

Visibility6 mi

Cloud Ceiling4000 ft

11 PM

81°
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 40%
Chevron down
Intermittent clouds

Heat Index88°

WindESE 6 mph

Air QualityExcellent

Wind Gusts6 mph

Humidity83%

Indoor Humidity83% (Extremely Humid)

Dew Point76° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover65%

Visibility10 mi

Cloud Ceiling30000 ft

Hourly Weather Forecast for Key Biscayne

AccuWeather's hourly forecast for Key Biscayne provides hour-by-hour temperatures, RealFeel® Temperature, and precipitation probability through the next 10 days. The current hour shows 84° with a RealFeel® of 91°, thunderstorms with a 53% 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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