Key Biscayne, FL
Climate overview — based on NOAA 1991-2020 normals from CAPE FLORIDA, FL US.
Year-round temperatures (°F)
Climate summary
Key Biscayne has an annual average temperature of 78.7°F with about 55.3 inches of precipitation per year. The warmest month is August (average high 91.4°F), and the coldest is January (average low 62.8°F). September is typically the wettest month (7.54 in) and February the driest (2.00 in).
Best time to visit Key Biscayne
Full guide →Climate change signal
All-time records →295 of 366 (80.6%) of Key Biscayne's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.
| 1990s | 4 | |
| 2000s | 17 | |
| 2010s | 207 | |
| 2020s | 138 |
Bars: number of all-time daily heat records still standing that were set in each decade.
Monthly averages
| Month | Avg High | Avg Low | Avg Temp | Precipitation | Snow | Rainy days |
|---|---|---|---|---|---|---|
| January | 77.5°F | 62.8°F | 70.1°F | 2.44 in | — | 8 |
| February | 78.9°F | 64.8°F | 71.8°F | 2.00 in | — | 7 |
| March | 80.9°F | 67.1°F | 74.0°F | 2.37 in | — | 6 |
| April | 83.8°F | 71.5°F | 77.6°F | 3.17 in | — | 6 |
| May | 86.5°F | 74.9°F | 80.7°F | 5.67 in | — | 10 |
| June | 89.6°F | 78.0°F | 83.8°F | 7.37 in | — | 15 |
| July | 90.8°F | 79.0°F | 84.9°F | 5.64 in | — | 15 |
| August | 91.4°F | 79.4°F | 85.4°F | 7.05 in | — | 16 |
| September | 90.3°F | 78.7°F | 84.5°F | 7.54 in | — | 15 |
| October | 87.2°F | 76.1°F | 81.6°F | 6.33 in | — | 13 |
| November | 82.7°F | 70.7°F | 76.7°F | 3.51 in | — | 9 |
| December | 79.7°F | 66.0°F | 72.9°F | 2.24 in | — | 8 |
Climate twins of Key Biscayne
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).