Overview: Kiawah IslandKiawah Island (United States of America) in general has a hot climate. Temperatures during the day are in the range from 15 °C (58 °F) in January to 32 °C (89 °F) in July. The highest sea temperatures in Kiawah Island are in August with 28 °C (83 °F) and the lowest in March with 17 °C (62 °F). The least rainy month in Kiawah Island is October with its 6 days of rain, the rainiest month is August, when it rains 13 days. Temperatures during the night go from 4 °C (40 °F) in January to 23 °C (74 °F) in July.