Key Biscayne Weather in December

In Key Biscayne, December brings high daytime temperatures around 26°C (79°F), with nights cooling to 19°C (66°F). Expect quite a bit of rainfall this month.

Rainfall in Key Biscayne in December

Climate statistics over the past 30 years suggest around 10 days of rain, with 72 mm (2.8 in) average for the month. The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.

Temperature in Key Biscayne in December

Key Biscayne in December is worth a visit. The temperature is perfect, with 26°C (79°F) during the day and 19°C (66°F) at night. Conditions stay fairly consistent through the month, making it easier to plan what to wear. With lows of 19°C (66°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.

Sunshine in Key Biscayne in December

The month enjoys around 216 hours of sunshine, creating mostly sunny days with good weather conditions.

Wind Speed in Key Biscayne in December

Wind speeds average 4 m/s (8 knots) during December. At this speed, expect moderate winds that can raise dust and move small branches. Since this is an average, some days have gentle light winds while others experience stronger breezes that are quite noticeable.

Average water temperature in December

At 25°C (77°F), the water is warm and comfortable for swimming. Most people find this temperature ideal for spending longer periods in the water.

If your ideal day consists of dry skies and pleasant temperatures, January, February, March, November and December typically offer the best circumstances for Key Biscayne.

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Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Key Biscayne's climate page.

Key Biscayne Temperature in December

Min Temperature 19°C (66°F)  

Max Temperature 26°C (79°F)  

Water Temperature 25°C (77°F) *  

Chance of Rain 34%  

Precipitation 72 mm (2.8 in)  

Rainy days 10 days  

Humidity 72% *  

Windspeed 4 m/s (8 knots) *  

Sunshine 216 hours *  

Percentage Sunshine 66% *  

* Data from: Miami, the United States of America (17 KM, 11 Miles).

What to Wear in Key Biscayne in December

Warm but pleasant conditions in Key Biscayne in December. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Wet weather is likely, so pack waterproof gear for multiple rainy days. With water temperatures around 25°C (77°F), swimming conditions are excellent. Pack your swimsuit, goggles, and maybe some water shoes. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in Key Biscayne in December

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

9/10

Cycling

7/10

Walking

7/10

Camping

8/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Key Biscayne's climate page.

More climate data for Key Biscayne

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Key Biscayne climate overview or explore weather in the United States of America.