Key Biscayne Weather, Climate and Best Time to Visit
Data source:Meteostat Update date:2025-09
Key Biscayne year round climate
Spring (March–May): Average 76–82°F, warm and comfortable climate, sunny, pleasant sea breeze. Common activities: Swimming, sunbathing, water sports, visiting Biscayne National Park. Suggested clothing: Light short-sleeved clothing, shorts, beachwear, sun protection clothing.
Summer (June–August): Average 83–85°F, hot and humid, more rainfall, occasional tropical storms. Common activities: Swimming, water sports, relaxing in the shade, visiting museums or indoor attractions. Suggested clothing: Light and breathable clothing, loose shorts or skirts, sun protection clothing, rain gear.
Autumn (September–November): Average 80–84°F, warm and comfortable climate, gradually decreasing rainfall, abundant sunshine. Common activities: Swimming, sunbathing, water sports, outdoor hiking. Suggested clothing: Light long-sleeved clothing, trousers or skirts, sun protection clothing.
Winter (December–February): Average 70–72°F, warm and comfortable, less rainfall, abundant sunshine, a comfortable season for sightseeing. Common activities: Swimming, sunbathing, water sports, bird watching. Suggested clothing: Light jacket, long-sleeved clothing, trousers or skirts.
Key Biscayne climatological average
Annual average temperature: approx. 78.8°F / Annual rainfall: approx. 1902 mm / Summer humidity: 70%–80% / Rainiest month: June
Key Biscayne monthly average temperature and precipitation
Month
Air temperature (°F)
Precipitation (mm)
January
70.5°F
58.7
February
72.7°F
87.7
March
76.3°F
95.7
April
78.1°F
147.3
May
82°F
123.7
June
83.1°F
346
July
85.6°F
150
August
85.6°F
239
September
84.6°F
288.3
October
81°F
153.7
November
77.9°F
155.3
December
71.8°F
57.3
Key Biscayne weather for the next seven days
1/31
Saturday
Patchy rain nearby
69.3°F/53.1°F
2/1
Sunday
Sunny
57.2°F/39.4°F
2/2
Monday
Sunny
63°F/41.2°F
2/3
Tuesday
Patchy rain nearby
66.2°F/50.4°F
2/4
Wednesday
Patchy rain nearby
69.2°F/65.4°F
2/5
Thursday
Patchy rain nearby
67.4°F/57.8°F
2/6
Friday
Sunny
63.7°F/51.4°F
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