January is the last month of winter in Key West and the coldest month of the year. The average high temperature will peak at 74°F (24°C) while the average low temperature will hit a maximum of 64°F (18°C).
In February, Key West sees the lowest precipitation rate in the entire year with just under 2 inches (38 mm) of rain to be expected. The average high temperature and average low temperature increases by two degrees to 76°F (24°C) and 66°F (19°C) respectively.
Key West Weather in March: The weather in March increases again by another two degrees resulting in an average high temperature of 78°F (26°C) and an average low temperature of 68°F (20°C).
April brings an average high temperature of 81°F (27°C) as spring continues in Key West. Low temperature averages are 72°F (22°C).
In May, the last month of spring, the temperatures jump up with the average high and average low temperatures ranging between 85°F (29°C) and 76°F (24°C).
Key West Weather in June: As summer kicks off in June, the average high temperature spikes to 88°F (31°C). The average low temperature also makes a jump to 79°F (26°C).
July is the hottest month of the year as the average high temperature increases to 89°F (32°C). Likewise, the average low temperature hits an annual high of 80°F (27°C).
In August, the average high and average low temperatures hold steady at 89°F (32°C) and 80°F (26°C) respectively, tying with July as one of the hottest months of the year. The only difference between the two months is that August has the second highest precipitation rate in the month at 5 inches (137 mm).
Key West Weather in September: The highest precipitation rate of the year goes to September with a whopping 7 inches (170 mm) of rainfall expected. The average high temperature decreases a single degree while the average low temperature goes down to 78°F (26°C).
October sees cooler temperatures with the average high temperature decreasing to 85°F (29°C). The average low temperature decreases two degrees to 76°F (24°C).
In November, the weather continues to cool quickly. The average high and average low temperatures range between 80°F (27°C) and 72°F (22°C) for the last of Key West’s autumn months.
December marks the beginning of winter and is the third coldest month of the year after February. The average high temperature rests at 76°F (24°C) while the average low temperature is 67°F (19°C).
The best time to visit Florida’s theme parks and other attractions is right after the Christmas vacation in February as there much less crowds and great deals to be had. To enjoy the Florida Keys, Ft. Lauderdale, South Beach and the Everglades, the best time to visit to avoid the crowds is to come between June and August. Beaches are at their best between June and August while it’s best to head to Key West in January and May.