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May weather - Spring 2026 - Key West, FL In May, the average ocean temperature is 80 8°F (27 1°C) Note: Surface water temperatures between 77°F (25°C) and 84 2°F (29°C) are perceived as excellent and extremely agreeable for enduring enjoyment in water activities In Key West, the average length of the day in May is 13h and 20min
What Is Key Wests Weather In May? May in Key West is characterized by comfortably warm temperatures The average high temperature during the day typically ranges from 83°F to 86°F (28°C to 30°C), while the nighttime lows rarely dip below 75°F (24°C) These mild temperatures create an ideal atmosphere for outdoor adventures and relaxation
Key West FL Weather in May - Current Results This page gives detailed information on the typical May temperature, precipitation, sun, humidity, wind and storms for Key West The numbers here are historical averages based on climate data gathered at the Key West International Airport, located on Key West Island
Average May Temperature in Key West by Year This page contains a list of the average monthly high and low temperatures in Key West, Florida for the month of May each year between 1948 and 2025 It is based on NOAA data
Key West Weather in May May days in Key West are characterized by hot temperatures and low precipitation levels With an average of about seven to eight rainy days, humidity is slightly higher than in April, marking the start of the wet season However, the air temperatures are increasing as well, ranging from 77°F (25°C) to 86°F (30°C)