Marathon Temperatures: Averages by Month
The numbers here tell you how hot and cold the weather usually is at Marathon, in the Florida Keys during each month of the year.
The average high and low temperatures are listed below monthly and annually for Boot Key and its neighbors, in both degrees Fahrenheit and Celsius.
Maximums and minimums are only part of the temperature picture. To fill in the rest, there's information on how many days a month get above or below a given temperature.
To find out how often it rises over 70, 80 or 90 °F each month in Marathon, scroll down farther. There are also monthly and yearly counts of days with cool weather.
All the numbers are averages, based on climate data gathered from 1981 to 2010.
|High °F||Low °F||High °C||Low °C|
Days of Hot Weather in Marathon
Winters are warm and summers hot at Marathon. From May to October, the islands average 81 days with highs in the 90s Fahrenheit. Even so, usually only once every two years does it get as hot as 100 °F (38 °C) in this stretch of Florida Keys.
How Often Marathon Has Cool Temperatures
Cool temperatures are rare at Marathon. Just two nights a year on average have lows of 50 °F or less. Temperatures colder than 40 °F (4 °C) are not expected here.
National Climatic Data Center. NOAA's 1981-2010 Climate Normals.