Overview: TongaTonga is a region with a tropical climate. The day temperatures range from 24 °C (76 °F) in August to 30 °C (86 °F) in February. The driest month is August with just 3 days of rain, on the contrary, the month when it rains the most is March with 17 days of rain. Temperatures during the night go from 19 °C (66 °F) in August to 23 °C (74 °F) in February. The highest sea temperatures in Tonga are in March with 27 °C (81 °F) and the lowest in August with 23 °C (74 °F).