Harman US

Key Biscayne, FL Weather & Growing Conditions

Today
88°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely after 11am. Partly sunny, with a high near 88. Heat index values as high as 103. South wind 5 to 8 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.

7-day forecast

WhenTempForecastWindPrecip
Today 88°F Showers And Thunderstorms Likely 5 to 8 mph S 57%
Tonight 82°F Showers And Thunderstorms Likely 9 mph E 55%
Wednesday 88°F Chance Showers And Thunderstorms 12 mph E 43%
Wednesday Night 83°F Chance Showers And Thunderstorms 13 to 17 mph E 39%
Thursday 87°F Showers And Thunderstorms Likely 17 mph E 58%
Thursday Night 82°F Chance Showers And Thunderstorms 18 mph E 66%
Friday 87°F Showers And Thunderstorms Likely 13 to 16 mph E 68%
Friday Night 82°F Chance Showers And Thunderstorms 15 mph E 49%
Saturday 89°F Chance Showers And Thunderstorms 14 mph SE 44%
Saturday Night 83°F Chance Showers And Thunderstorms 14 mph E 31%
Sunday 89°F Chance Showers And Thunderstorms 13 mph E 25%
Sunday Night 83°F Chance Showers And Thunderstorms 14 mph E 25%
Monday 90°F Sunny then Slight Chance Showers And Thunderstorms 13 mph E 20%
Monday Night 83°F Slight Chance Showers And Thunderstorms then Mostly Clear 13 mph E 20%

Forecast source: National Weather Service (api.weather.gov). Updated through the day.

Growing snapshot for Key Biscayne, FL

Growing season
365 days
Hardiness zone
11a

Explore more for Key Biscayne, FL: full frost dates · planting calendar · Florida frost dates

Climate data from the nearest NOAA station, Cape Florida, Fl (3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.