Weathermondo.comKey Biscayne climate and temperatures
The climate of Key Biscayne is Temperate oceanic climate (Köppen: Cfa), with warm summers and precipitation throughout the year. Monthly temperatures range from a minimum of 25°C in winter (December–February) to a maximum of 33°C in summer (June–August). The average annual temperature is around 30°C.
During the winter months, nighttime temperatures can drop to an average of 16°C, while summer nights average around 26°C.
Climate table of Key Biscayne
The climate table below gives you a clear overview of the climate in Key Biscayne by month, from average temperatures and rainfall to UV levels. This makes it easy to see when the weather best suits your travel plans.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
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| Temp. max (°C) | 14 | 16 | 17 | 19 | 23 | 27 | 30 | 30 | 27 | 23 | 18 | 16 |
| Temp. min (°C) | 6 | 7 | 9 | 11 | 15 | 19 | 22 | 22 | 19 | 15 | 10 | 7 |
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| Rainfall (mm) | 46 | 34 | 46 | 64 | 43 | 23 | 22 | 75 | 77 | 84 | 61 | 25 |
| UV index | 4 | 5 | 6 | 7 | 8 | 8 | 8 | 8 | 6 | 5 | 4 | 4 |
Best time to visit Key Biscayne
The best time to visit Key Biscayne is March. During this period, temperatures are usually pleasant to warm and there is relatively little rainfall. Especially in March, the climate is favorable, with an average high temperature of 28°C and around 41 mm of rainfall. For a city trip, round trip, or active holiday, March are often more comfortable, as it is warm without the heat becoming too intense. The warmest month is July, with an average daytime temperature of around 33°C. The driest month is March, with about 41 mm of rainfall, while August is usually the wettest month of the year, with approximately 390 mm. Snow plays virtually no role in the climate here.
Average temperature per month
This chart shows the average daytime (maximum) and nighttime (minimum) temperatures per month in Key Biscayne. The figures are based on climate data from recent years and are presented in degrees Celsius, so you can clearly see the temperature range for each month.
Average rainfall per month
This chart shows the average monthly rainfall in Key Biscayne. The figures are based on long-term climate data and are displayed in millimeters, so you can immediately see which months are drier or wetter.
Average UV index per month
This chart shows the average monthly sun intensity in Key Biscayne. The UV index ranges from 0 (no UV radiation) to 11+ (extreme). A higher UV index means you can burn more quickly, making proper sun protection increasingly important.
Average annual temperature
This chart shows the average annual temperature in Key Biscayne based on data from the past ten years. It allows you to see at a glance how the climate is evolving and whether there are clear warming trends.
Average annual rainfall
This chart shows the average annual rainfall in Key Biscayne over the past ten years. It allows you to see at a glance how much rain falls each year and whether there are clear fluctuations between the years.
Weather experiences in Key Biscayne
The weather in Key Biscayne is rated an average of 4.3 out of 5 stars by 8 visitors. Have you been to Key Biscayne? Share your experience with the weather to help other visitors plan their trip.
Average weather per month
Click on a month below and discover what the weather in Key Biscayne is typically like. For each period, you can instantly see the average temperature, rainfall, wind, and UV index. Thanks to years of historical weather data, you’ll know exactly what to expect during your trip.