As of 18:18 EDT

Key Biscayne, FL weather in December

90°

Key Biscayne, Saturday, 8 August, 18:18

Light rain. Feels like 103°. High 92°, low 80°.

Pressure30.00 inHg

Wind1 mph E

Humidity70%

Visibility6.2 mi

Dew point78°

See detailed hourly forecast

In December, Key Biscayne, FL averages a high of 75.4° and a low of 67°. About 1.9 inches of precipitation fall over the month (8 wet days). The record high is 86.2° (2019) and the record low 36° (1989). Normals are computed over the last 60 years.

Day	High	Low	Chance of precip.	Record high	Record low
1	76.8°	69.1°	32%	82° (1977)	52.7° (1969)
2	76.8°	68.7°	20%	86.2° (2019)	50.2° (2020)
3	76.6°	68.7°	22%	83.3° (2018)	51.6° (2019)
4	76.8°	68.7°	28%	83.8° (2023)	53.4° (1989)
5	76.6°	68°	32%	82.6° (1978)	52.3° (1968)
6	76.6°	67.6°	32%	82.6° (2025)	54.5° (2018)
7	76.3°	67.8°	32%	81.5° (1978)	47.8° (2010)
8	76.5°	68.5°	32%	82.9° (2025)	48° (2010)
9	75.9°	68.9°	40%	83.5° (2018)	45.9° (2020)
10	75.9°	68.5°	35%	84.2° (2009)	47.5° (2020)
11	75.6°	67.1°	27%	82° (2024)	47.7° (1962)
12	75.6°	66.9°	25%	81.7° (2021)	48.2° (2017)
13	75.7°	67.6°	30%	81.9° (2021)	41.7° (1962)
14	75.9°	67.6°	25%	83.3° (2019)	41.2° (2010)
15	75.6°	67.3°	33%	82.8° (2013)	45.3° (2010)
16	75.6°	66.9°	38%	81.1° (2019)	42.4° (1968)
17	75°	66.2°	33%	81.3° (2019)	51.8° (1960)
18	74.7°	65.3°	23%	82.2° (1961)	48.9° (1988)
19	74.8°	65.8°	13%	82.9° (2025)	50.5° (1981)
20	74.7°	66.4°	20%	80.6° (2018)	45° (1981)
21	74.8°	66°	25%	81.9° (1978)	52° (2003)
22	74.1°	65.5°	17%	80.8° (2022)	45.7° (1973)
23	75.2°	66.7°	33%	80.4° (1968)	49.3° (1989)
24	75°	66.4°	20%	81.5° (2014)	36° (1989)
25	74.1°	65.1°	30%	81° (2017)	36.7° (1989)
26	73.2°	64°	27%	80.8° (2012)	38.5° (1983)
27	73.2°	63.9°	17%	80.6° (2021)	46.4° (2010)
28	74.1°	65.7°	30%	80.6° (2015)	44.8° (2010)
29	75.6°	66.7°	20%	81.3° (2012)	49.8° (1980)
30	74.8°	66.6°	15%	81.7° (2021)	47.5° (1961)
31	75.4°	67.6°	30%	81.3° (2021)	46.9° (2025)