Overview: MirissaMirissa (Sri Lanka) in general has a tropical climate. The day temperatures range from 29 °C (84 °F) in July to 31 °C (88 °F) in March. The least rainy month in Mirissa is January with its 6 days of rain, the rainiest month is November, when it rains 16 days. The highest night temperatures could be experienced in May with 25 °C (77 °F), the lowest in February with 23 °C (74 °F). The highest sea temperatures in Mirissa are in April with 29 °C (85 °F) and the lowest in July with 27 °C (81 °F).