Key West Aquarium, snake
Key West Aquarium, alligator
Key West Aquarium, rays

Key West Weather Information

Key West, FL, can make one claim that no other city in the Continental U.S. can make: Key West is a completely frost-free city! Located at 24 degrees North Latitude, Key West lies in the subtropical region of the northern hemisphere, and features a mild tropical climate, affected and further enhanced by the maritime effects of the Gulf of Mexico and the Gulf Stream. With an average annual high of 82 degrees and an average annual low of 73 degrees, Key West is balmy and warm year-round. Summer and winter temperatures are rarely more than 10 degrees different!

Winter in Key West

Winter, from December through February, is the most popular time to visit Key West. Temperatures during the busy season range from 74 to 76 degrees, with night time lows in the mid to upper 60s. Those seeking perfectly ideal weather will not be disappointed with a visit during winter. To avoid the crowds, plan a trip in early December before the busy holiday season and the biggest crowds of the year.

Spring in Key West

Spring is also a popular time of year to visit Key West. With highs in the upper 70s to mid 80s, March and April are great months to visit the area's numerous parks and beaches, and also to enjoy a round of golf. Another great aspect of spring is the relatively low amount of precipitation that falls on the Florida Keys — less than 2 inches of rain falls each month during March and April.

Summer in Key West

As June arrives, summer temperatures begin to rise. Crowds wane with the rising humidity and the occasional mosquito; travelers looking for short lines at Key West attractions, less traffic, and less expensive prices will enjoy a visit during June, July and August. Temperatures from June through September are typically in the mid- to upper-80s, so summertime visitors will want to bring sunglasses and sunblock, beachwear, tank tops and shorts, and sandals or boat shoes. Whereas spring is relatively rain-free, June, July and August see increased chances for afternoon thundershowers, which usually appear and dissipate rather quickly. Water temperature during the summer and early fall is between 85 and 87 degrees.

Fall in Key West

Fall, also known as 'hurricane season,' brings the rainiest time of year, and also the greatest chances for tropical weather, making it the least desirable travel time out of the four seasons. September is the rainiest month of the year, when an average of 6.4 inches of rain falls in Key West. Daily highs are in the 80s, and lows are in the 70s.

With its maritime and sub-tropical climate, Key West is guaranteed to be completely frost- and snow-free during the winters, providing a welcome retreat from most winter weather around the rest of the U.S. Though summer can be on the warm side, temperature and humidity are tempered by the cooling effects of the tradewinds and refreshing sea breezes. Whether travelers seek a cruise on the Key West Harbor, a close encounter with a dolphin, or history and famous landmarks, Key West has something for everyone!

Check out current conditions in Key West and the Florida Keys.

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