TODAY NOV21
TEMPERATURE77
HUMIDITY90
PRESSURE101080
WIND COND.330 20.5
  • 7966Thu30%
  • 7667Fri
  • 7563Sat
  • 7970Sun
  • 8072Mon
daynightWeather update from Key West International Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Key West for August is 85.4 degrees
  • The lowest monthly average temperature in Key West for January is 70 degrees
  • The most monthly precipitation in Key West occurs in September with 7.1 inches
  • The air quality index in Key West is 19% better than the national average
  • The pollution index in Key West is 1488% worse than the national average

Compare Key West, FL Weather

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      Key West 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
      January64°F77°F70°F1.6"
      February65°F77°F71°F2.1"
      March68°F79°F73°F1.5"
      April72°F83°F77°F2.0"
      May76°F86°F80°F2.9"
      June78°F88°F83°F4.1"
      July80°F90°F85°F4.5"
      August80°F90°F85°F5.5"
      September79°F89°F84°F7.1"
      October76°F86°F81°F6.1"
      November70°F81°F75°F2.1"
      December68°F79°F73°F2.3"

      Key West 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.
      IndexKey WestFloridaNational
      Air quality index343542
      Pollution index43,296,2007,570,7852,726,193

      Key West air quality

      MeasurementTotal
      Days measured362
      Days with good air quality331
      Days with moderate air quality31
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Air quality details

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

      Average monthly Key West temperature with heat index

      Key West monthly precipitation with daily maximum

      Key West monthly snow depth with daily maximum

      Key West monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Big Coppitt Key, FL2,6443432.0%
      Stock Island, FL4,6923432.0%
      Key West, FL24,4953432.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Collinsville, IL24,489548.0%
      Watauga, TX24,487512.0%
      Ottumwa, IA24,5052942.0%
      Brookings, SD24,4794216.0%
      Homer Glen, IL24,5215510.0%
      Key West, FL24,4953432.0%
      Source: The Key West, 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.