The average temperature for the year in Horn Island is 81.0°F (27.2°C). The warmest month, on average, is December with an average temperature of 83.0°F (28.3°C). The coolest month on average is July, with an average temperature of 77.0°F (25°C).
The highest recorded temperature in Horn Island is 98.0°F (36.7°C), which was recorded in December. The lowest recorded temperature in Horn Island is 64.0°F (17.8°C), which was recorded in June.
The average amount of precipitation for the year in Horn Island is 67.5" (1714.5 mm). The month with the most precipitation on average is January with 18.2" (462.3 mm) of precipitation. The month with the least precipitation on average is September with an average of 0.1" (2.5 mm). In terms of liquid precipitation, there are an average of 102.9 days of rain, with the most rain occurring in January with 19.1 days of rain, and the least rain occurring in September with 0.0 days of rain.