If you're looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Seisia: The hottest months are usually November and October, with an average temperature of 28°C, while the coldest months are August and July, with an average of 25°C. The rainiest months in Seisia are January, February, March and December, with each month seeing an average of 402 mm of rainfall.