Overview: Hilton Head IslandHilton Head Island (United States of America) is a place with a hot climate. Temperatures during the day are in the range from 16 °C (60 °F) in January to 32 °C (90 °F) in July. Sea temperatures are in the following range: 16 °C (62 °F) in February to 29 °C (84 °F) in August. The driest month is October with just 6 days of rain, on the contrary, the month when it rains the most is July with 13 days of rain. Temperatures during the night go from 4 °C (39 °F) in January to 23 °C (73 °F) in July.