Overview: Hikkaduwa Hikkaduwa (Sri Lanka) in general has a tropical climate. Temperatures during the day are in the range from 29 °C (84 °F) in July to 31 °C (89 °F) in March. The highest sea temperatures in Hikkaduwa are in April with 29 °C (85 °F) and the lowest in August with 27 °C (81 °F). The least rainy month in Hikkaduwa is January with its 7 days of rain, the rainiest month is November, when it rains 18 days. The highest night temperatures could be experienced in May with 25 °C (77 °F), the lowest in January with 23 °C (73 °F).