The best times to visit Key Biscayne for ideal weather are
November 19th to April 1st
based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.
Key Biscayne Travel Guide
Other Key Biscayne Travel Info
Weather in Key Biscayne
Average temperatures in Key Biscayne vary somewhat. Considering humidity, temperatures feel hot for about half of the year and otherwise nice with a fair chance of precipitation about half of the year. The area is less temperate than some — in the 35th percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Key Biscayne, the hottest months are August, July, and then September. See average monthly temperatures below. The warmest time of year is generally early August where highs are regularly around 92.2°F (33.4°C) with temperatures rarely dropping below 77.3°F (25.2°C) at night.
Key Biscayne Temperatures (Fahrenheit)
Key Biscayne Temperatures (Celsius)
The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.
Key Biscayne Perceived Temperature (F)
Key Biscayne Perceived Temperature (C)
Average Key Biscayne Temperatures by Month
Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.
|Month||Avg. High (°F)||Avg. Mean (°F)||Avg. Low (°F)|
|Month||Avg. High (°C)||Avg. Mean (°C)||Avg. Low (°C)|
Precipitation (Rain or Snow)
If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Key Biscayne are January, December, and then March. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around early January. For example, on the week of January 1st there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in mid to late August with an average of 4 days of significant precipitation the week of August 20th.
When can you find snow in Key Biscayne? Weather stations report no annual snow. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.
Chance of Precipitation
The graph below shows the % chance of rainy and snowy days in Key Biscayne.
Snow on the Ground
The graph below shows the average snow on the ground in Key Biscayne (in).
Average Rain and Snow by Month
|Month||Daily Chance of Rain||Average Snow Depth (in)||Total Precipitation (in)|
|Month||Daily Chance of Rain||Average Snow Depth (cm)||Total Precipitation (cm)|
Humidity and Wind
Key Biscayne has some high humidity months, with other comfortably humid months. The least humid month is March (55.8% relative humidity), and the most humid month is September (69.7%).
Wind in Key Biscayne is usually calm. The windiest month is April, followed by March and May. April’s average wind speed of around 8 knots (9.2 MPH or 14.8 KPH) is considered “a gentle breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in late May where average top sustained speeds reach 14.8 knots, which is considered a moderate breeze.
Relative Humidity (%)
The graph below shows the average % humidity by month in Key Biscayne.
The graph below shows wind speed (max and average) in knots.
Average Wind Speeds
Show Wind Speeds
All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.
|Month||Avg. Wind||Avg. Wind Feel||Sustained High Wind||High Wind Feel|
|Jan||6.5||Light breeze||12.3||Significant breeze|
|Feb||6.8||Light breeze||12.7||Significant breeze|
|Mar||7.9||Gentle breeze||14||Significant breeze|
|Apr||8||Gentle breeze||14||Significant breeze|
|May||7.9||Gentle breeze||14||Significant breeze|
|Jun||6.4||Light breeze||13.9||Significant breeze|
|Jul||5.4||Light breeze||13||Significant breeze|
|Aug||5.6||Light breeze||12.8||Significant breeze|
|Sep||5.4||Light breeze||12.7||Significant breeze|
|Oct||6.6||Light breeze||12.6||Significant breeze|
|Nov||6.8||Light breeze||12.3||Significant breeze|
|Dec||6.6||Light breeze||12.2||Significant breeze|
Show Relative Humidity by Month
|Month||Avg. Relative Humidity|
Is it Safe to Travel to Key Biscayne?
Our best data indicates this area is generally safe. As of Oct 07, 2019 there are no travel advisories or warnings for the United States; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Sep 23, 2019.
The Busiest and Least Crowded Months
The busiest month for tourism in Key Biscayne, FL, US is March, followed by January and February. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Key Biscayne in November. Those willing to visit at these times will likely find it the least expensive month.
Estimated Tourism by Month
Most Popular Months to Visit
Overall Key Biscayne Travel Experience by Season
Spring (March through May)
Humidity and temperatures combine to make this season feel warm. Highs range from 89°F (31.7°C) and 80.4°F (26.9°C) with warmer temperatures in the later months. Rain is somewhat common with 4 to 6 days of significant precipitation per month. Spring is the busiest for tourism, which makes it a good time for those looking for things to do.
Summer (June through August)
The middle-year months have very comfortable weather with high temperatures that are quite warm. These months see the most precipitation with 12 to 13 days of precipitation per month. June – August is fairly slow season for tourism in Key Biscayne, so lodging and other accommodations may cost slightly less.
Fall (September through November)
Fall daily highs range from 90.9°F (32.7°C) and 81°F (27.2°C), which will feel very nice given the humidity and wind. It rains or snows a significant amount: 6 to 13 days per month. Tourism is the slowest during these months due to the weather, so hotels may be affordably priced.
Winter (December through February)
Weather is perfect this time of year in Key Biscayne to be enjoyable for warm weather travelers. The average high during this season is between 81.5°F (27.5°C) and 78.1°F (25.6°C). On average, it rains or snows a smalll amount: 3 to 4 times per month. These times of year are the second busiest with tourists.