As of 18:18 EDT

Key Biscayne, FL weather in May

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 May, Key Biscayne, FL averages a high of 82.6° and a low of 73.9°. About 4.0 inches of precipitation fall over the month (13 wet days). The record high is 97.2° (2024) and the record low 59.4° (1992). Normals are computed over the last 60 years.

Day	High	Low	Chance of precip.	Record high	Record low
1	80.8°	72°	35%	90.3° (1971)	60.8° (1999)
2	81.3°	72.3°	30%	86.7° (2023)	62.4° (1999)
3	81.5°	72.7°	33%	86.7° (1964)	65.3° (1999)
4	81.9°	72.9°	35%	86.2° (1975)	65.5° (1971)
5	81.9°	72.7°	43%	86.9° (2021)	65.8° (2023)
6	82.2°	72.5°	32%	90.3° (2020)	64.2° (1988)
7	82°	72.5°	35%	87.6° (2021)	62.2° (2017)
8	82°	72.7°	23%	87.8° (1998)	59.4° (1992)
9	82.6°	73.4°	30%	90.9° (1998)	63.9° (1960)
10	82.6°	73.6°	32%	90.3° (1998)	65.1° (1960)
11	82.4°	73.9°	35%	92.8° (2024)	65.5° (1961)
12	82.4°	73.6°	37%	91° (2008)	66.4° (2022)
13	82.6°	73.4°	35%	88.5° (1965)	65.5° (2001)
14	82.6°	74.1°	42%	89.1° (2019)	64.6° (1960)
15	82.9°	73.8°	48%	93° (2024)	67.5° (1978)
16	82.9°	73.8°	43%	97.2° (2024)	69.1° (1978)
17	82.6°	73.9°	47%	90.3° (2024)	68° (1973)
18	82.6°	74.1°	42%	89.8° (2024)	66.9° (1973)
19	82.4°	74.3°	43%	91.4° (2024)	69.1° (2006)
20	82.9°	74.5°	47%	92.3° (2024)	69.4° (2006)
21	83.1°	74.3°	47%	89.8° (2025)	68° (1994)
22	83.1°	74.7°	48%	91.9° (2025)	66.9° (1994)
23	82.9°	74.8°	53%	88.3° (2025)	68.2° (1994)
24	83.1°	75°	45%	88.5° (2024)	69.1° (1992)
25	83.3°	74.8°	52%	90.7° (2024)	71.1° (1967)
26	82.9°	74.8°	52%	91.4° (2024)	67.1° (1979)
27	83.5°	74.8°	48%	90.3° (2024)	68.4° (1967)
28	83.3°	75.2°	63%	90.9° (2017)	71.6° (1977)
29	83.5°	75.2°	57%	91.4° (2024)	70.5° (2023)
30	83.7°	75.4°	60%	90.5° (2025)	71.8° (1976)
31	83.3°	75.6°	57%	91.2° (2025)	67.8° (1971)