Planning for the weather is a good way to make your trip to Kotu relaxing and enjoyable, especially when you’re splurging. The hottest months are usually November and October with an average temp of 80°F, while the coldest months are February and March with an average of 76°F. The rainiest months in Kotu are August, September, July, and October, with each month seeing an average of 8 inches of rainfall.