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Weather in Key Biscayne, FL · National Weather Service + NOAA

Key Biscayne is snow country

Key Biscayne has warm winters and warm summers, with plenty of rain. A typical July afternoon reaches 89°, a January night drops to 62°, and snow is almost unheard of. In November, a normal day reaches 81° and a normal night drops to 69°.

Winter 77°/63°Spring 82°/70°Summer 89°/77°Fall 85°/74°
Right now
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Sunrise 6:29 am · sunset 5:38 pm

Getting the latest forecast from the National Weather Service…

What stands out about Key Biscayne’s weather

Read from 30 years of NOAA records. Each one opens the full story on the Climate page.

Climate →
Snow countryAbout 0 inches a winter, more than 910 of 927 Florida towns.Milder winters than most of FloridaJanuary nights average 62°, milder than 944 of 958 Florida towns.It hardly ever freezesOnly 0% of years see a night at 32° or below.Cool summersJuly afternoons average 89°, cooler than 943 of 958 Florida towns.
A normal year

Where today sits in Key Biscayne’s year

Typical highs and lows month by month, from 30 years of NOAA records.

Full climate →
Winter
77° / 63°
Snow is rare
Spring
82° / 70°
Frost is rare by spring
Summer
89° / 77°
55 days reach 90° in a normal year
Fall now
85° / 74°
Mild well into the fall
Best months to be outside
JanFebMarAprNovDec
Highs of 62–84° and lows of 40° or more
How much snow does Key Biscayne get?Almost none.When is it wettest?June, with 8.9 inches.Is it warmer than it used to be?+2.0° vs. the 20th century.

Weather talk

Road reports, first frosts and storm memories from neighbors in Key Biscayne.

Town Square →
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Forecast, conditions and alerts: National Weather Service. Climate: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000. Temperatures and rainfall come from NOAA’s gridded normals for Key Biscayne itself (about a 3-mile square). Snow, frost dates and day counts: the NOAA station at Cape Florida, FL (1 mi). Sunrise and sunset are calculated from the town’s position. Normals are 30-year averages, not a forecast.