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Current weather in Key Biscayne is scattered clouds.

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This page shows hourly weather forecast for Key Biscayne, including temperature, wind, precipitation, humidity and cloud cover.

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Weather data for Key Biscayne is updated regularly with the latest available observations and forecasts.

Now · 9:10 PM

Key Biscayne Weather & Hourly Forecast

United States · Florida · 33149

83°F

Partly cloudy night

Feels like: 87°F

💧 Humidity 75% 🌡 Pressure 30.06 inHg 💨 Wind 12 mph 👁 Visibility 17.4 mi ☁ Clouds 55% ☀️ UV index 1.0 · Low 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for Key Biscayne

Today

10:00 PM

Mostly clear night

83° 💧 0.036 in 💨 11 mph H 76%30.09 inHg

Tomorrow

1:00 AM

Thunderstorms

78° 💧 0.266 in 💨 9 mph H 85%30.09 inHg

4:00 AM

Mostly clear night

79° 💧 0.004 in 💨 6 mph H 90%30.03 inHg

7:00 AM

Mostly clear night

79° 💧 0.029 in 💨 5 mph H 91%30.03 inHg

10:00 AM

Partly cloudy

82° 💧 0.007 in 💨 9 mph H 77%30.06 inHg

1:00 PM

Light rain

83° 💧 0.064 in 💨 14 mph H 72%30.06 inHg

4:00 PM

Light rain

83° 💧 0.042 in 💨 10 mph H 72%30.00 inHg

7:00 PM

Partly cloudy

83° 💧 0.041 in 💨 8 mph H 73%30.00 inHg

10:00 PM

Light rain

81° 💧 0.020 in 💨 7 mph H 81%30.03 inHg

Friday

1:00 AM

Light rain

80° 💧 0.064 in 💨 5 mph H 81%30.03 inHg

4:00 AM

Mostly clear night

78° 💧 0.001 in 💨 4 mph H 88%30.00 inHg

7:00 AM

Mostly clear night

78° 💧 0.039 in 💨 4 mph H 93%29.97 inHg

10:00 AM

Partly cloudy

82° 💧 0.003 in 💨 3 mph H 77%30.03 inHg

1:00 PM

Light rain

84° 💧 0.021 in 💨 6 mph H 71%30.00 inHg

4:00 PM

Light rain

83° 💧 0.106 in 💨 5 mph H 74%29.94 inHg

7:00 PM

Light thunderstorms

78° 💧 0.116 in 💨 3 mph H 85%29.97 inHg

Today

10:00 PM

Mostly clear night

83° 💧 0.003 in 💨 11 mph H 76%30.09 inHg

11:00 PM

Light rain

83° 💧 0.011 in 💨 10 mph H 77%30.09 inHg

Tomorrow

12:00 AM

Light rain

78° 💧 0.021 in 💨 13 mph H 84%30.09 inHg

1:00 AM

Thunderstorms

78° 💧 0.231 in 💨 9 mph H 85%30.09 inHg

2:00 AM

Light rain

78° 💧 0.031 in 💨 5 mph H 89%30.06 inHg

3:00 AM

Light rain

79° 💧 0.004 in 💨 6 mph H 89%30.06 inHg

4:00 AM

Mostly clear night

79° 💧 0.001 in 💨 6 mph H 90%30.03 inHg

5:00 AM

Mostly clear night

79° 💧 0.001 in 💨 5 mph H 90%30.03 inHg

6:00 AM

Mostly clear night

80° 💧 0.001 in 💨 5 mph H 89%30.03 inHg

7:00 AM

Mostly clear night

79° 💧 0.001 in 💨 5 mph H 91%30.03 inHg

8:00 AM

Light rain

79° 💧 0.004 in 💨 6 mph H 90%30.06 inHg

9:00 AM

Light rain

80° 💧 0.024 in 💨 9 mph H 81%30.06 inHg

10:00 AM

Partly cloudy

82° 💧 0.002 in 💨 9 mph H 77%30.06 inHg

11:00 AM

Mostly sunny

83° 💧 0.002 in 💨 10 mph H 77%30.06 inHg

12:00 PM

Mostly sunny

83° 💧 0.003 in 💨 11 mph H 73%30.06 inHg

1:00 PM

Light rain

83° 💧 0.015 in 💨 14 mph H 72%30.06 inHg

2:00 PM

Light rain

82° 💧 0.014 in 💨 12 mph H 77%30.06 inHg

3:00 PM

Light thunderstorms

82° 💧 0.034 in 💨 10 mph H 75%30.03 inHg

4:00 PM

Light rain

83° 💧 0.017 in 💨 10 mph H 72%30.00 inHg

5:00 PM

Light thunderstorms

84° 💧 0.023 in 💨 8 mph H 70%30.00 inHg

6:00 PM

Partly cloudy

84° 💧 0.002 in 💨 9 mph H 72%30.00 inHg

7:00 PM

Partly cloudy

83° 💧 0.003 in 💨 8 mph H 73%30.00 inHg

8:00 PM

Partly cloudy night

83° 💧 0.004 in 💨 8 mph H 75%30.00 inHg

9:00 PM

Light thunderstorms

81° 💧 0.034 in 💨 6 mph H 80%30.00 inHg

10:00 PM

Light rain

81° 💧 0.010 in 💨 7 mph H 81%30.03 inHg

11:00 PM

Light rain

81° 💧 0.005 in 💨 6 mph H 83%30.03 inHg

Friday

12:00 AM

Light rain

81° 💧 0.004 in 💨 6 mph H 81%30.03 inHg

1:00 AM

Light rain

80° 💧 0.007 in 💨 5 mph H 81%30.03 inHg

2:00 AM

Light thunderstorms

78° 💧 0.051 in 💨 6 mph H 85%30.03 inHg

3:00 AM

Light rain

78° 💧 0.006 in 💨 4 mph H 86%30.00 inHg

4:00 AM

Mostly clear night

78° 💧 0.001 in 💨 4 mph H 88%30.00 inHg

5:00 AM

Mostly clear night

78° 💧 None 💨 4 mph H 89%29.97 inHg

6:00 AM

Partly cloudy night

78° 💧 None 💨 4 mph H 91%29.97 inHg

7:00 AM

Mostly clear night

78° 💧 0.000 in 💨 4 mph H 93%29.97 inHg

8:00 AM

Light thunderstorms

79° 💧 0.017 in 💨 2 mph H 90%30.00 inHg

9:00 AM

Light rain

80° 💧 0.022 in 💨 1 mph H 81%30.00 inHg

10:00 AM

Partly cloudy

82° 💧 0.002 in 💨 3 mph H 77%30.03 inHg

11:00 AM

Partly cloudy

83° 💧 0.000 in 💨 4 mph H 74%30.03 inHg

12:00 PM

Mostly cloudy

83° 💧 0.001 in 💨 5 mph H 73%30.03 inHg

1:00 PM

Light rain

84° 💧 0.007 in 💨 6 mph H 71%30.00 inHg

2:00 PM

Light thunderstorms

84° 💧 0.007 in 💨 6 mph H 72%30.00 inHg

3:00 PM

Light thunderstorms

82° 💧 0.007 in 💨 7 mph H 73%29.97 inHg

4:00 PM

Light rain

83° 💧 0.015 in 💨 5 mph H 74%29.94 inHg

5:00 PM

Light rain

82° 💧 0.014 in 💨 7 mph H 78%29.94 inHg

6:00 PM

Light thunderstorms

79° 💧 0.077 in 💨 6 mph H 82%29.94 inHg

7:00 PM

Light thunderstorms

78° 💧 0.073 in 💨 3 mph H 85%29.97 inHg

8:00 PM

Light rain

79° 💧 0.029 in 💨 1 mph H 82%29.97 inHg

9:00 PM

Light rain

78° 💧 0.014 in 💨 1 mph H 85%29.97 inHg

10:00 PM

Light rain

78° 💧 0.005 in 💨 2 mph H 89%30.00 inHg

11:00 PM

Overcast night

77° 💧 0.001 in 💨 3 mph H 94%30.00 inHg

Saturday

12:00 AM

Mostly cloudy night

77° 💧 None 💨 3 mph H 97%29.97 inHg

1:00 AM

Mostly cloudy night

77° 💧 None 💨 3 mph H 98%29.97 inHg

2:00 AM

Mostly cloudy night

77° 💧 0.001 in 💨 3 mph H 96%29.97 inHg

3:00 AM

Overcast night

77° 💧 0.001 in 💨 3 mph H 96%29.94 inHg

4:00 AM

Mostly clear night

77° 💧 None 💨 3 mph H 97%29.91 inHg

5:00 AM

Partly cloudy night

76° 💧 0.001 in 💨 5 mph H 97%29.91 inHg

6:00 AM

Light thunderstorms

75° 💧 0.060 in 💨 2 mph H 96%29.94 inHg

7:00 AM

Light rain

76° 💧 0.016 in 💨 2 mph H 94%29.94 inHg

8:00 AM

Light rain

78° 💧 0.013 in 💨 3 mph H 87%29.94 inHg

5:00 PM

Light rain

82° 💧 None 💨 4 mph H 74%29.88 inHg

8:00 PM

Light thunderstorms

77° 💧 None 💨 7 mph H 88%29.91 inHg

11:00 PM

Mostly clear night

78° 💧 None 💨 2 mph H 90%29.97 inHg

Sunday

2:00 AM

Mostly clear night

76° 💧 None 💨 5 mph H 94%29.91 inHg

5:00 AM

Partly cloudy night

73° 💧 None 💨 2 mph H 99%29.88 inHg

8:00 AM

Light rain

76° 💧 None 💨 2 mph H 94%29.94 inHg

11:00 AM

Light rain

82° 💧 None 💨 6 mph H 79%29.94 inHg

2:00 PM

Light rain

84° 💧 None 💨 8 mph H 72%29.91 inHg

5:00 PM

Light rain

83° 💧 None 💨 4 mph H 75%29.85 inHg

8:00 PM

Light rain

76° 💧 None 💨 9 mph H 93%29.88 inHg

11:00 PM

Mostly clear night

75° 💧 None 💨 5 mph H 93%29.91 inHg

Monday

2:00 AM

Mostly clear night

77° 💧 None 💨 5 mph H 92%29.91 inHg

5:00 AM

Mostly clear night

76° 💧 None 💨 3 mph H 94%29.88 inHg

8:00 AM

Partly cloudy

76° 💧 None 💨 6 mph H 94%29.91 inHg

11:00 AM

Mostly cloudy

82° 💧 None 💨 6 mph H 77%29.94 inHg

2:00 PM

Light rain

85° 💧 None 💨 6 mph H 73%29.91 inHg

5:00 PM

Light rain

80° 💧 None 💨 10 mph H 83%29.88 inHg

8:00 PM

Mostly cloudy night

77° 💧 None 💨 5 mph H 91%29.91 inHg

11:00 PM

Overcast night

77° 💧 None 💨 4 mph H 94%29.94 inHg

Tuesday

2:00 AM

Light rain

76° 💧 None 💨 3 mph H 95%29.91 inHg

5:00 AM

Overcast night

77° 💧 None 💨 4 mph H 92%29.88 inHg

8:00 AM

Light rain

78° 💧 None 💨 4 mph H 91%29.94 inHg

11:00 AM

Light rain

81° 💧 None 💨 3 mph H 81%30.00 inHg

2:00 PM

Light rain

84° 💧 None 💨 6 mph H 76%29.94 inHg

8:00 PM

Light thunderstorms

81° 💧 None 💨 7 mph H 80%29.97 inHg

Wednesday

2:00 AM

Overcast night

79° 💧 None 💨 3 mph H 88%29.94 inHg

8:00 AM

Mostly cloudy

80° 💧 None 💨 4 mph H 83%29.94 inHg

2:00 PM

Overcast

79° 💧 None 💨 1 mph H 90%29.94 inHg

8:00 PM

Moderate rain

79° 💧 None 💨 6 mph H 86%29.97 inHg

Thursday

2:00 AM

Overcast night

77° 💧 None 💨 3 mph H 95%29.94 inHg

8:00 AM

Overcast

77° 💧 None 💨 4 mph H 93%29.94 inHg

2:00 PM

Moderate rain

77° 💧 None 💨 5 mph H 93%29.94 inHg

8:00 PM

Light rain

79° 💧 None 💨 4 mph H 85%29.94 inHg

Friday

2:00 AM

Moderate rain

77° 💧 None 💨 3 mph H 94%29.94 inHg

8:00 AM

Light rain

77° 💧 None 💨 2 mph H 93%29.91 inHg

2:00 PM

Overcast

78° 💧 None 💨 3 mph H 92%29.91 inHg

8:00 PM

Moderate rain

79° 💧 None 💨 5 mph H 88%29.94 inHg

Saturday

2:00 AM

Light rain

78° 💧 None 💨 1 mph H 93%29.91 inHg

8:00 AM

Light thunderstorms

75° 💧 None 💨 3 mph H 95%29.88 inHg

2:00 PM

Light rain

75° 💧 None 💨 4 mph H 96%29.88 inHg

8:00 PM

Light thunderstorms

81° 💧 None 💨 6 mph H 79%29.85 inHg

Sunday

2:00 AM

Light rain

76° 💧 None 💨 4 mph H 96%29.85 inHg

8:00 AM

Overcast

74° 💧 None 💨 3 mph H 97%29.83 inHg

2:00 PM

Partly cloudy

75° 💧 None 💨 2 mph H 98%29.83 inHg

8:00 PM

Light rain

86° 💧 None 💨 1 mph H 68%29.80 inHg

Monday

2:00 AM

Light thunderstorms

76° 💧 None 💨 5 mph H 94%29.85 inHg

8:00 AM

Overcast

75° 💧 None 💨 5 mph H 98%29.85 inHg

2:00 PM

Mostly cloudy

74° 💧 None 💨 4 mph H 95%29.85 inHg

8:00 PM

Light rain

83° 💧 None 💨 7 mph H 78%29.85 inHg

Tuesday

2:00 AM

Very heavy rain

76° 💧 None 💨 4 mph H 95%29.88 inHg

8:00 AM

Mostly cloudy

75° 💧 None 💨 3 mph H 97%29.88 inHg

2:00 PM

Partly cloudy

75° 💧 None 💨 3 mph H 98%29.88 inHg

8:00 PM

Light thunderstorms

79° 💧 None 💨 6 mph H 89%29.91 inHg

Wednesday

2:00 AM

Overcast night

79° 💧 None 💨 1 mph H 90%29.88 inHg

8:00 AM

Mostly cloudy

76° 💧 None 💨 2 mph H 98%29.85 inHg

2:00 PM

Overcast

76° 💧 None 💨 2 mph H 99%29.88 inHg

8:00 PM

Light rain

81° 💧 None 💨 3 mph H 83%29.88 inHg

Thursday

2:00 AM

Overcast night

79° 💧 None 💨 4 mph H 88%29.85 inHg

8:00 AM

Overcast

78° 💧 None 💨 7 mph H 92%29.85 inHg

2:00 PM

Light rain

78° 💧 None 💨 5 mph H 91%29.91 inHg

In Key Biscayne and, more broadly, across the state of Florida: Tonight, expect mostly clear skies with just a few clouds drifting by. Temperatures will stay warm, ranging from the mid-80s to around 86 degrees Fahrenheit. Winds will be light from the northeast, reaching up to 9 mph with occasional gusts up to 18 mph. No rain is anticipated during the evening hours, so conditions will remain dry and comfortable. It will stay warm through the night, making for a mild evening. Keep in mind that the wind could pick up slightly at times, but overall, conditions will be calm. It’s a good evening to enjoy outdoor activities, but remember to stay hydrated if you're outside for extended periods.

15-Day Weather Outlook for Key Biscayne

TomorrowTomorrow

Thunderstorms 84°/78° 💧 None 💨 14 mph

Friday, Sep 18Fri Sep 18

Light thunderstorms 84°/77° 💧 None 💨 7 mph

Saturday, Sep 19Sat Sep 19

Light thunderstorms 85°/75° 💧 1.026 in 💨 6 mph

Sunday, Sep 20Sun Sep 20

Light rain 84°/76° 💧 0.400 in 💨 6 mph

Monday, Sep 21Mon Sep 21

Light rain 82°/77° 💧 0.463 in 💨 7 mph

Tuesday, Sep 22Tue Sep 22

Light thunderstorms 81°/78° 💧 0.227 in 💨 7 mph

Wednesday, Sep 23Wed Sep 23

Moderate rain 80°/77° 💧 0.635 in 💨 6 mph

Thursday, Sep 24Thu Sep 24

Moderate rain 79°/77° 💧 0.792 in 💨 5 mph

Friday, Sep 25Fri Sep 25

Moderate rain 79°/77° 💧 0.791 in 💨 5 mph

Saturday, Sep 26Sat Sep 26

Light thunderstorms 81°/75° 💧 0.800 in 💨 6 mph

Sunday, Sep 27Sun Sep 27

Light thunderstorms 86°/74° 💧 0.216 in 💨 5 mph

Monday, Sep 28Mon Sep 28

Very heavy rain 83°/74° 💧 0.422 in 💨 7 mph

Tuesday, Sep 29Tue Sep 29

Light thunderstorms 79°/75° 💧 0.565 in 💨 6 mph

Wednesday, Sep 30Wed Sep 30

Light rain 81°/76° 💧 0.168 in 💨 4 mph

Thursday, Oct 1Thu Oct 1

Light rain 78°/78° 💧 0.178 in 💨 7 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Key Biscayne

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for Key Biscayne

Hourly forecast · Updated every 2 hours

Good

Nearest forecast value 10:00 PM

PM2.5 Fine particles Good 1,0µg/m³

Microscopic particles that can penetrate deep into the lungs. Elevated concentrations can especially affect children, older adults and people with respiratory conditions.

PM10 Particulate matter Good 2,9µg/m³

Includes dust, pollen and other airborne particles. High concentrations may irritate the respiratory system.

O₃ Ozone Good 57,7µg/m³

Ground-level ozone can irritate the eyes and respiratory system when concentrations are elevated.

NO₂ Nitrogen dioxide Good 0,5µg/m³

A gas emitted mainly by traffic and some industrial activity. High exposure can affect respiratory health.

Air quality is favorable for outdoor activities.

UV & HEALTH

UV, Sun & Health Outlook in Key Biscayne

Maximum daily UV Today, tomorrow and the following day show the maximum UV index forecast for each day.

0–2 Low 3–5 Moderate 6–7 High 8–10 Very high 11+ Extreme

Today UV 8,0Very high 😊Good

Tomorrow UV 7,0High 😊Good

Friday UV 8,0Very high 🙂Fair

Saturday UV 8,0Very high 🙂Fair

Sunday UV 8,0Very high 😊Good

Monday UV 6,0High —Unavailable

Tuesday UV 8,0Very high —Unavailable

Today's weather health advice Open today's recommendations.

Very high UV risk

Use SPF 50+ sunscreen, a hat and sunglasses. Seek shade and limit exposure around midday.

Good air quality

Air quality is good and outdoor activities can be enjoyed normally.

Stay hydrated

Drink water regularly, especially during physical activity or prolonged sun exposure.

Best in the morning or late in the day

For walking, running or cycling, prefer the early morning or late afternoon.

WIND OUTLOOK

Hourly Wind Forecast for Key Biscayne

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · KEY BISCAYNE, FLORIDA

Tonight's Stargazing & Shooting Stars

Excellent observing conditions. Best local viewing window: 6:00 AM–7:00 AM.

82/100Best-hour score

BEST TIME TONIGHT 6:00 AM–7:00 AM Astronomical darkness: 8:40 PM–5:50 AM

☁ Cloud cover 21% Real hourly forecast for the best viewing hour.

☾ Moonlight 31% First Quarter · Moon below the horizon at the best viewing hour.

☄ Meteor activity September ε-Perseids Reference ZHR 8 · Radiant 69° high at the best hour.

✦ Estimated visible meteors 1–4/hour Local estimate after weather, moonlight and radiant-height adjustments.

Chance ≥1 meteor in 30 min72%

UPCOMING METEOR PERIODSStart, peak and end dates · weather should be checked closer to the peak.

SEP 5–SEP 21

September ε-PerseidsStart SEP 5 · Peak SEP 9 · End SEP 21 · ZHR 8 · 6% Moon at peak

ACTIVE NOW

SEP 20–NOV 20

Southern TauridsStart SEP 20 · Peak NOV 5 · End NOV 20 · ZHR 7 · 20% Moon at peak

UPCOMING

OCT 2–NOV 7

OrionidsStart OCT 2 · Peak OCT 21 · End NOV 7 · ZHR 20 · 77% Moon at peak

UPCOMING

OCT 20–DEC 10

Northern TauridsStart OCT 20 · Peak NOV 12 · End DEC 10 · ZHR 5 · 7% Moon at peak

UPCOMING

Experimental local observing estimate. Weather values come from the hourly forecast already used on this page. Moon position and astronomical darkness are calculated locally from time and coordinates. Meteor-shower ZHR describes ideal conditions and is not the number of meteors a person should expect to see locally.

DISCOVER WEATHER NEARBY Weather in other cities

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Forecast data for Key Biscayne were last refreshed today at 9:10 PM. The current forecast period extends through 18/09/2026 at 7:00 PM. Weather, air-quality and UV-index data are provided through WEATHER-INFO.COM. Forecasts are produced automatically from the latest available data and are subject to periodic technical checks. This service is intended for general weather information.