Key West, FL Weather
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Key West Area
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
| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 64°F | 77°F | 70°F | 1.6" |
| February | 65°F | 77°F | 71°F | 2.1" |
| March | 68°F | 79°F | 73°F | 1.5" |
| April | 72°F | 83°F | 77°F | 2.0" |
| May | 76°F | 86°F | 80°F | 2.9" |
| June | 78°F | 88°F | 83°F | 4.1" |
| July | 80°F | 90°F | 85°F | 4.5" |
| August | 80°F | 90°F | 85°F | 5.5" |
| September | 79°F | 89°F | 84°F | 7.1" |
| October | 76°F | 86°F | 81°F | 6.1" |
| November | 70°F | 81°F | 75°F | 2.1" |
| December | 68°F | 79°F | 73°F | 2.3" |
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| Index | Key West | Florida | National |
| Air quality index | 34 | 35 | 42 |
| Pollution index | 43,296,200 | 7,570,785 | 2,726,193 |
Key West air quality information
| Measurement | Total |
| Days measured | 362 |
| Days with good air quality | 331 |
| Days with moderate air quality | 31 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
Key West air quality information
| Pollutant | Total |
| Arsenic | 0.060% |
| Benzene | 0.510% |
| Carbon Tetrachloride | 0.150% |
| Lead | 0.330% |
| Mercury | 0.090% |
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 | Population | Air Quality Index | National Avg. |
| Big Coppitt Key, FL | 2,644 | 34 | 32.0% |
| Stock Island, FL | 4,692 | 34 | 32.0% |
| Key West, FL | 24,495 | 34 | 32.0% |
Cities with similar population
| City | Population | Air Quality Index | National Avg. |
| Collinsville, IL | 24,489 | 54 | 8.0% |
| Watauga, TX | 24,487 | 51 | 2.0% |
| Ottumwa, IA | 24,505 | 29 | 42.0% |
| Brookings, SD | 24,479 | 42 | 16.0% |
| Homer Glen, IL | 24,521 | 55 | 10.0% |
| Key West, FL | 24,495 | 34 | 32.0% |
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.
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