Key Biscayne, FL Weather & Climate Normals
Key Biscayne's real weather, in one number
Key Biscayne, FL scores 54/100 on this site's reading of NOAA's own 30-year normals: strongly seasonal. Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. 4 of the year's 12 months average between 55 and 75°F, the range this site counts as mild.
Key Biscayne's hottest and coldest months
Key Biscayne's hottest month is Aug, averaging 85°F; its coldest is Jan, averaging 70°F, a 15.2°F swing across the year, one of the smaller gaps in this dataset.
Key Biscayne's weather across the year
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 78°F | 63°F | 2.44in | 0in |
| Feb | 79°F | 65°F | 2in | 0in |
| Mar | 81°F | 67°F | 2.37in | 0in |
| Apr | 84°F | 72°F | 3.17in | 0in |
| May | 87°F | 75°F | 5.67in | 0in |
| Jun | 90°F | 78°F | 7.37in | 0in |
| Jul | 91°F | 79°F | 5.64in | 0in |
| Aug | 91°F | 79°F | 7.05in | 0in |
| Sep | 90°F | 79°F | 7.54in | 0in |
| Oct | 87°F | 76°F | 6.33in | 0in |
| Nov | 83°F | 71°F | 3.51in | 0in |
| Dec | 80°F | 66°F | 2.24in | 0in |
Jan, Feb, Mar, and Dec are the best time to see Key Biscayne at its mildest; the rest of the year, plan around Aug's heat.
Rain and snow in Key Biscayne
Key Biscayne averages 55.33in of precipitation a year across roughly 127 days with measurable rain or snow, and 0in of snow a year.
Where Key Biscayne ranks
Key Biscayne ranks 955 of 4876 US cities in this dataset for comfort score, and 222 of 229 within FL. About 15,111 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from Cape Florida, FL US, 1.4 miles from Key Biscayne, not a prediction for any specific day.
More on how this is worked out
What a 30-year climate normal actually is · Why this uses the nearest NOAA station