Taking into account the local weather in Karimun is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually May and April with an average temp of 83°F, while the coldest months are January and February with an average of 81°F. The rainiest months in Karimun are November, December, May, and April, with each month seeing an average of 13 inches of rainfall.