Key Biscayne, FL Weather & Growing Conditions
Tonight
80°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Partly cloudy, with a low around 80. Northeast wind 3 to 7 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 80°F | Chance Showers And Thunderstorms | 3 to 7 mph NE | 32% |
| Saturday | 87°F | Showers And Thunderstorms Likely | 6 mph NE | 75% |
| Saturday Night | 78°F | Chance Showers And Thunderstorms | 6 mph E | 59% |
| Sunday | 87°F | Chance Showers And Thunderstorms | 6 mph NE | 92% |
| Sunday Night | 80°F | Showers And Thunderstorms | 7 mph S | 92% |
| Monday | 87°F | Showers And Thunderstorms | 3 to 10 mph S | 91% |
| Monday Night | 79°F | Showers And Thunderstorms | 9 mph S | 91% |
| Tuesday | 88°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 8 mph S | 86% |
| Tuesday Night | 79°F | Showers And Thunderstorms | 7 mph S | 86% |
| Wednesday | 88°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 7 mph SE | 87% |
| Wednesday Night | 79°F | Showers And Thunderstorms | 7 mph SE | 87% |
| Thursday | 87°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 7 mph S | 82% |
| Thursday Night | 80°F | Showers And Thunderstorms then Chance Showers And Thunderstorms | 7 mph S | 82% |
| Friday | 88°F | Chance Showers And Thunderstorms | 7 mph NE | 77% |
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 Sep 19, 2026.