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Get the monthly weather forecast for Marathon, FL, including daily high/low, historical averages, to help you plan ahead.
December Weather in Marathon Florida, United States. Daily high temperatures decrease by 3°F, from 79°F to 76°F, rarely falling below 67°F or exceeding 83°F. Daily low temperatures decrease by 4°F, from 70°F to 66°F, rarely falling below 56°F or exceeding 76°F.
The weather in Marathon during December is usually perfect, offering high temperatures and moderate rainfall. Daytime temperatures generally settle around 25°C , while nighttime can see a dip to about 20°C .
The hottest month of the year in Marathon is August, with an average high of 90°F and low of 81°F. The cool season lasts for 2.9 months, from December 6 to March 1, with an average daily high temperature below 78°F. The coldest month of the year in Marathon is January, with an average low of 65°F and high of 75°F.
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.
Weather.com brings you the most accurate monthly weather forecast for Marathon, FL with average/record and high/low temperatures, precipitation and more.
The average temperature in Marathon in December for a typical day ranges from a high of 76°F (24°C) to a low of 72°F (22°C). Some would describe it as pleasantly warm with a gentle breeze. For comparison, the hottest month in Marathon, August, has days with highs of 86°F (30°C) and lows of 84°F (29°C). The coldest month, January has ...
