Getting an idea of what to expect from the weather in Pohnpei will help you enjoy your stay to the fullest. The hottest months are usually September and October, with an average temperature of 28°C, while the coldest months are March and July, with an average of 28°C. The rainiest months in Pohnpei are May, July, November and June, with each month seeing an average of 406 mm of rainfall.