Key Biscayne (FL) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Key Biscayne.
Climate overview of Key Biscayne
Temperatures in Key Biscayne, Florida, United States of America, shift moderately through the seasons. The warmest month is August at 32°C (90°F), and the coolest is January at 24°C (75°F).
The city has a wet climate, receiving around 1400 mm (55 in) of rainfall per year. Despite the high annual total, it has a distinct rainy season from August to October. August is the wettest month. Sunshine peaks in July, when the city sees around 10.3 hours of sunshine per day.
Key Biscayne Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Key Biscayne — and find the best time to visit.
Monthly Temperature in Key Biscayne
The weather in Key Biscayne changes moderately throughout the year, offering enough variation to appreciate each season. On average, daytime temperatures range from a very warm 32°C (90°F) in August to a comfortable 24°C (75°F) in January.
Nighttime temperatures range from 26°C (79°F) in August to 17°C (63°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Key Biscayne
Key Biscayne has a notably wet climate with abundant precipitation, recording 1400 mm (55 in) of rainfall per year. The seasons in Key Biscayne bring significant changes in precipitation. The wettest month, August, receives heavy rainfall, with an average of 186 mm (7.3 in) of precipitation. This rainfall is distributed across 24 rainy days.
In contrast, the driest month, January, experiences much less rainfall, totaling 40 mm (1.6 in) over 9 rainy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Key Biscayne Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Key Biscayne
Key Biscayne enjoys sunny spells year-round. July sees up to 10.3 hours of daily sunshine, perfect for a sunny trip. December, the least sunny month, still offers a generous 7.2 hours of sun despite this cloudier time of the year.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Water Temperature in Key Biscayne
The mean water temperature over the year ranges from 24°C (75°F) in January to 28°C (82°F) in June.
Water temperature over the year
Humidity in Key Biscayne by Month
The relative humidity is high throughout the year in Key Biscayne.
The city experiences its highest humidity in September, reaching 78%. In April, the humidity drops to its lowest level at 67%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Wind Speed in Key Biscayne
The mean wind speed varies between 4 m/s (8 knots) and 5 m/s (10 knots) throughout the year. It is lowest in January, June, July, August, September, October and December and highest during February, March, April, May and November. What does this mean?
The mean monthly wind speed over the year (meters per second)
Best Time to Visit Key Biscayne
The wettest months are June, July, August, September and October, when precipitation is at its highest. Looking for inspiration on where to travel this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.
Frequently asked questions about the climate in Key Biscayne
What is the best time to visit Key Biscayne?
January, February, March, November and December typically offer the most optimal weather in Key Biscayne. In contrast, August and September tend to have less optimal conditions. Key Biscayne has a distinct rainy season from August to October.
What temperatures can I expect in Key Biscayne?
Daytime highs range from 24°C (75°F) in January to 32°C (90°F) in August. Nighttime lows range from 17°C (63°F) to 26°C (79°F).
How much rain does Key Biscayne get?
Annual rainfall is around 1400 mm (55 in). August is the wettest month with 186 mm (7.3 in), while January is the driest with 40 mm (1.6 in).
How sunny is Key Biscayne?
Key Biscayne receives around 3,122 hours of sunshine per year. July is the sunniest month with 308 hours, while December is the cloudiest with just 216 hours. Overall, Key Biscayne enjoys abundant sunshine.
Key Biscayne 3-Day Forecast
Key Biscayne (FL) 3-Day Forecast
Key Biscayne on the map
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