If you're looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Pohnpei: 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.