June in Key Largo is the cloudiest month of the year. In June, the weather in Key Largo is typically hot. Average daily high temperature in June is about 29 degrees above zero. On average, Key Largo has 16 rainy, 10 sunny, 3 partly cloudy, and 1 cloudy day in June. The rains are usually moderate. June as well as August and September is considered the most uncomfortable time to visit Key Largo.