TODAY NOV24
TEMPERATURE74
HUMIDITY62
PRESSURE
WIND COND.50 14.8
  • 7971Mon
  • 8171Tue
  • 8172Wed
  • 8172
  • 8070Fri
daynightWeather update from The Florida Keys - Marathon International Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Marathon for July is 84.8 degrees
  • The lowest monthly average temperature in Marathon for February is 69.9 degrees
  • The most monthly precipitation in Marathon occurs in August with 10.4 inches
  • The air quality index in Marathon is 3% better than the national average
  • The pollution index in Marathon is 1488% worse than the national average

Compare Marathon, FL Weather

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      Marathon Average Temperature

      In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
      MonthTemp. (min)Temp. (max)Temp. (avg)Precipitation
      January65°F77°F71°F2.2"
      February64°F77°F70°F4.1"
      March68°F80°F74°F4.1"
      April70°F82°F76°F5.9"
      May75°F86°F80°F5.5"
      June77°F89°F82°F10.3"
      July80°F91°F85°F7.7"
      August79°F91°F85°F10.4"
      September78°F90°F84°F9.6"
      October78°F87°F82°F5.1"
      November71°F82°F76°F0.7"
      December68°F80°F73°F2.0"

      Marathon air quality index & pollution index

      In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
      IndexMarathonFloridaNational
      Air quality index413542
      Pollution index43,296,2007,570,7852,726,193

      Marathon air quality

      MeasurementTotal
      Days measured363
      Days with good air quality284
      Days with moderate air quality77
      Days w/ poor A.Q. for sensitive groups2
      Days with unhealthy air quality0

      Air quality details

      PollutantTotal
      Arsenic0.060%
      Benzene0.510%
      Carbon Tetrachloride0.150%
      Lead0.330%
      Mercury0.090%

      Average monthly Marathon temperature with heat index

      Marathon monthly precipitation with daily maximum

      Marathon monthly snow depth with daily maximum

      Marathon monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Layton, FL1074118.0%
      Duck Key, FL7614118.0%
      Key Colony Beach, FL5234118.0%
      Marathon, FL8,7464118.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Fitzgerald, GA8,7472648.0%
      Hanover, NH8,7443432.0%
      Pulaski, VA8,7444118.0%
      Riverside, IL8,7485510.0%
      Ridgefield, WA8,7513824.0%
      Marathon, FL8,7464118.0%
      Source: The Marathon, FL weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.