Planning for the weather is an important factor for making your trip to Tarawa a success, especially when you're splurging. The hottest months are usually May and June, with an average temperature of 28ยฐC, while the coldest months are March and February, with an average of 28ยฐC. The rainiest months in Tarawa are March, January, April and December, with each month seeing an average of 228 mm of rainfall.