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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"

Did you know?

  • The highest monthly average temperature in Key West for August is 85 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 33% better than the national average.
  • The pollution index in Key West is 754% worse than the national average.

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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 index333550
Pollution index43,296,20015,391,3445,066,862

Key West air quality information

MeasurementTotal
Days measured365
Days with good air quality328
Days with moderate air quality37
Days w/ poor A.Q. for sensitive groups
Days with unhealthy air quality

Key West air quality information

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

City, StatePopulationAir Quality IndexNational Avg.
Big Coppitt Key, FL3,0623334%
Stock Island, FL4,2143334%
Key West, FL26,0393334%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Wasco, CA26,0617958%
Carbondale, IL26,0663922%
Plainview, NY26,087536%
Asheboro, NC25,9784020%
Xenia, OH26,105484%
Key West, FL26,0393334%
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.