Key Biscayne Weather in December

The climate in Key Biscayne during December can be summarized as warm, humid and reasonably dry.

December is in the winter in Key Biscayne and is typically the 3rd coldest month of the year. Daytime maximum temperatures average around a muggy 25°C (76°F), whilst at night 17°C (62°F) is normal.

On average December is the driest month of the year in Key Biscayne with around 50mm 2 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 7 days, although this may vary considerably.

On the flip side this corresponds to an average of 7.6 hours of sunshine per day.

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Key Biscayne in December 2024.