Expand
Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average sea temperature
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
The beautiful and dramatic landscape of the Miami Crandon Park in Key Biscayne, Florida
Weather in January
January, the same as December, in Key Biscayne, Florida, is an agreeable winter month, with an average temperature varying between 73°F (22.8°C) and 65.1°F (18.4°C). Key Biscayne records the coldest temperatures in January, averaging a high of 73°F (22.8°C) and a low of 65.1°F (18.4°C). Weather in January »
Weather in February
The last month of the winter, February, is a moderately hot month in Key Biscayne, Florida, with an average temperature varying between 74.5°F (23.6°C) and 67.5°F (19.7°C). February's arrival registers an average high-temperature of a warm 74.5°F (23.6°C), closely aligning with the temperature of the previous month. Weather in February »
Weather in March
The first month of the spring, March, is also a moderately hot month in Key Biscayne, Florida, with an average temperature ranging between max 75.6°F (24.2°C) and min 69.1°F (20.6°C). Key Biscayne's average high-temperature in March sits at a still warm 75.6°F (24.2°C), showing little difference from the previous month. Weather in March »
Weather in April
April, the same as March, is another warm spring month in Key Biscayne, Florida, with an average temperature fluctuating between 79.3°F (26.3°C) and 73.8°F (23.2°C). Key Biscayne experiences a transition to a still moderately hot 79.3°F (26.3°C) in average high-temperatures with the arrival of April, not greatly differing from March's 75.6°F (24.2°C). Weather in April »
Weather in May
May, the last month of the spring in Key Biscayne, is another warm month, with an average temperature ranging between max 82°F (27.8°C) and min 77°F (25°C). The average high-temperature during May registers at a still warm 82°F (27.8°C), closely corresponding to the preceding month. Weather in May »
Weather in June
June, the first month of the summer in Key Biscayne, is still a warm month, with an average temperature fluctuating between 80.2°F (26.8°C) and 84.7°F (29.3°C). The initiation of June records an average high-temperature of a still moderately hot 84.7°F (29.3°C), displaying a near consistency with the previous month. Weather in June »
Weather in July
July is a tropical summer month in Key Biscayne, Florida, with temperature in the range of an average low of 81.9°F (27.7°C) and an average high of 86.5°F (30.3°C). The high-temperature average in July for Key Biscayne is a tropical 86.5°F (30.3°C), staying closely aligned with June's conditions. Weather in July »
Weather in August
The last month of the summer, August, is another hot month in Key Biscayne, Florida, with an average temperature ranging between min 82.6°F (28.1°C) and max 87.1°F (30.6°C). August stands out as Key Biscayne's warmest month, with temperatures ranging between an average high of 87.1°F (30.6°C) and a low of 82.6°F (28.1°C). August's heat index is estimated at a sweltering 98.6°F (37°C). Weather in August »
Weather in September
The first month of the autumn, September, is also a moderately hot month in Key Biscayne, Florida, with an average temperature ranging between min 81°F (27.2°C) and max 85.6°F (29.8°C). Key Biscayne notes an average high-temperature of a warm 85.6°F (29.8°C) in September, displaying minor variation from August. Weather in September »
Weather in October
October, like September, in Key Biscayne, Florida, is a moderately hot autumn month, with an average temperature fluctuating between 82.8°F (28.2°C) and 77.5°F (25.3°C). Key Biscayne marks the arrival of October with an average high-temperature of a still warm 82.8°F (28.2°C), hardly different from September's 85.6°F (29.8°C). Weather in October »
Weather in November
The last month of the autumn, November, is another warm month in Key Biscayne, Florida, with an average temperature ranging between min 72.3°F (22.4°C) and max 77.9°F (25.5°C). Key Biscayne's entry into November measures an average high-temperature of a still warm 77.9°F (25.5°C), closely parallel to the preceding month. Weather in November »
Weather in December
The first month of the winter, December, is also a moderately hot month in Key Biscayne, Florida, with an average temperature ranging between min 69.4°F (20.8°C) and max 75.7°F (24.3°C). The transition from November to December sees average high-temperatures adjusting to a still warm 75.7°F (24.3°C), from a not significantly different 77.9°F (25.5°C). Weather in December »
Updated: Feb 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What time of the year is the coldest in Key Biscayne?
Key Biscayne, Florida, witnesses the coldest weather in January, with temperatures averaging a high of 73°F (22.8°C) and a low of 65.1°F (18.4°C).
What is the driest month in Key Biscayne?
The month with the least rainfall is January, when the rain falls for 9.2 days and typically collects 0.43" (11mm) of precipitation.
How many days does it rain in Key Biscayne?
Throughout the year, in Key Biscayne, there are 182.7 rainfall days, and 16.38" (416mm) of precipitation is accumulated.
What is the month with the lowest UV index in Key Biscayne?
The months with the lowest UV index are January and December, with an average maximum UV index of 5.
What month is the ocean coldest in Key Biscayne?
With an average ocean temperature of 73.9°F (23.3°C), February is the month with the coldest seawater in Key Biscayne, Florida.
What is the least humid month in Key Biscayne?
With an average relative humidity of 70%, March is the least humid month.
When is Daylight Saving Time (DST) in Key Biscayne?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Key Biscayne, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.
When is the highest UV index in Key Biscayne?
The months with the highest UV index are May through October, with an average maximum UV index of 7.
When are the longest days in Key Biscayne?
June has the longest days of the year, with an average of 13h and 42min of daylight.
What month has the most sunshine in Key Biscayne?
July has the most sunshine of the year in Key Biscayne, with an average of 11.1h of sunshine.
What time of the year is the hottest in Key Biscayne?
August, having an average high-temperature of 87.1°F (30.6°C) and an average low-temperature of 82.6°F (28.1°C), is the warmest month.
What is the wettest month in Key Biscayne?
August is the month with the most rainfall in Key Biscayne. Rain falls for 22.1 days and accumulates 2.8" (71mm) of precipitation.
What month is the ocean warmest in Key Biscayne?
With an average ocean temperature of 86.5°F (30.3°C), August is the month with the warmest seawater.
What is the most humid month in Key Biscayne?
With an average relative humidity of 75%, December is the most humid month in Key Biscayne, Florida.
What is the month with the shortest days in Key Biscayne?
The month with the shortest days in Key Biscayne, Florida, is December, with an average of 10h and 36min of daylight.
What is the month with the least sunshine in Key Biscayne?
The month with the least sunshine is December, with an average of 6.4h of sunshine.
Average temperature
Key Biscayne, FL
The warmest month (with the highest average high temperature) is August (87.1°F).
The month with the lowest average high temperature is January (73°F).
The month with the highest average low temperature is August (82.6°F).
The coldest month (with the lowest average low temperature) is January (65.1°F).
Average pressure
Key Biscayne, FL
- Average pressure in January:
30.11"Hg - Average pressure in February:
30.09"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
30.02"Hg - Average pressure in May:
30.01"Hg - Average pressure in June:
30"Hg
- Average pressure in July:
30.03"Hg - Average pressure in August:
29.99"Hg - Average pressure in September:
29.95"Hg - Average pressure in October:
29.95"Hg - Average pressure in November:
30.03"Hg - Average pressure in December:
30.08"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The months with the lowest atmospheric pressure are September and October (29.95"Hg).
Average wind speed
Key Biscayne, FL
- Average wind speed in January:
11.5mph - Average wind speed in February:
11.1mph - Average wind speed in March:
11.6mph - Average wind speed in April:
11.3mph - Average wind speed in May:
10.6mph - Average wind speed in June:
8.5mph
- Average wind speed in July:
8.1mph - Average wind speed in August:
8.5mph - Average wind speed in September:
8.5mph - Average wind speed in October:
11.1mph - Average wind speed in November:
11.4mph - Average wind speed in December:
11.1mph
The windiest month (with the highest average wind speed) is March (11.6mph).
The calmest month (with the lowest average wind speed) is July (8.1mph).
Average humidity
Key Biscayne, FL
The month with the highest relative humidity is December (75%).
The month with the lowest relative humidity is March (70%).
Average rainfall
Key Biscayne, FL
- Average rainfall in January:
0.43" - Average rainfall in February:
0.51" - Average rainfall in March:
0.51" - Average rainfall in April:
0.75" - Average rainfall in May:
1.77" - Average rainfall in June:
2.01"
- Average rainfall in July:
2.44" - Average rainfall in August:
2.8" - Average rainfall in September:
1.93" - Average rainfall in October:
1.65" - Average rainfall in November:
0.83" - Average rainfall in December:
0.75"
The wettest month (with the highest rainfall) is August (2.8").
The driest month (with the least rainfall) is January (0.43").
Average rainfall days
Key Biscayne, FL
- Average rainfall days in January:
9.2 days - Average rainfall days in February:
8.7 days - Average rainfall days in March:
9.3 days - Average rainfall days in April:
12 days - Average rainfall days in May:
15.3 days - Average rainfall days in June:
19 days
- Average rainfall days in July:
21.4 days - Average rainfall days in August:
22.1 days - Average rainfall days in September:
24.5 days - Average rainfall days in October:
17.3 days - Average rainfall days in November:
12.2 days - Average rainfall days in December:
11.7 days
The month with the highest number of rainy days is September (24.5 days).
The month with the least rainy days is February (8.7 days).
Average sea temperature
Key Biscayne, FL
The best month for swimming (with the highest average sea temperature) is August (86.5°F).
The coldest month (with the lowest average sea temperature) is February (74°F).
Average daylight / Average sunshine
Key Biscayne, FL
- Average daylight in January:
10h and 4min - Average daylight in February:
11h and 2min - Average daylight in March:
12h and 0min - Average daylight in April:
12h and 5min - Average daylight in May:
13h and 2min - Average daylight in June:
13h and 4min
- Average daylight in July:
13h and 4min - Average daylight in August:
13h and 0min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 3min - Average daylight in November:
10h and 5min - Average daylight in December:
10h and 4min
The month with the longest days is June (Average daylight: 13h and 42min).
The month with the shortest days is December (Average daylight: 10h and 36min).
- Average sunshine in January:
6h and 3min - Average sunshine in February:
8h and 4min - Average sunshine in March:
8h and 4min - Average sunshine in April:
10h and 0min - Average sunshine in May:
10h and 4min - Average sunshine in June:
10h and 4min
- Average sunshine in July:
11h and 1min - Average sunshine in August:
10h and 4min - Average sunshine in September:
9h and 1min - Average sunshine in October:
6h and 5min - Average sunshine in November:
6h and 3min - Average sunshine in December:
6h and 2min
The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 24min).
Average sunshine days
Key Biscayne, FL
- Average sunshine days in January:
16.6 days - Average sunshine days in February:
14.7 days - Average sunshine days in March:
17 days - Average sunshine days in April:
13.9 days - Average sunshine days in May:
11.4 days - Average sunshine days in June:
7.2 days
- Average sunshine days in July:
5.6 days - Average sunshine days in August:
4.4 days - Average sunshine days in September:
3.2 days - Average sunshine days in October:
9 days - Average sunshine days in November:
11.9 days - Average sunshine days in December:
14.5 days
The month with the most sunshine days is March (17 days).
The month with the least sunshine days is September (3.2 days).
Average UV index
Key Biscayne, FL
The months with the highest UV index are May, June, July, August, September and October (UV index 7).
The months with the lowest UV index are January and December (UV index 5).
Average cloud cover
Key Biscayne, FL
The month with the most cloud cover is October (Cloud cover 35).
The month with the least cloud cover is April (Cloud cover 26).
Average visibility
Key Biscayne, FL
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Key Biscayne, Florida, USA
Weather forecast for your location
1. Click Locate me button
2. Allow the app to use your location
2. Allow the app to use your location