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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| 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.