If you’re hoping to get lost in the rain on your romantic getaway, take a look at these details about year-round temperatures in Kadavu Island: The hottest months are usually February and March, with an average temperature of 27°C, while the coldest months are August and July, with an average of 24°C. The rainiest months in Kadavu Island are March, February, January and April, with each month seeing an average of 314 mm of rainfall.