About Key Largo, FL's Climate & Weather History

Key Largo is a city of approximately 10,400 people in Florida, United States. Located in the Eastern Time Zone at 25.1°N latitude.

In 2025, Key Largo recorded an average annual temperature of 78°F. The hottest temperatures reached 89°F in August; the coolest were 53°F in January. Total precipitation for the year was 42 inches, with the wettest month being September.