If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Kotu: The hottest months are usually November and October, with an average temperature of 27°C, while the coldest months are February and March, with an average of 24°C. The rainiest months in Kotu are August, September, July and October, with each month seeing an average of 202 mm of rainfall.