Taking into account the local weather in Sungai Merah is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually May and August with an average temp of 80°F, while the coldest months are February and March with an average of 78°F. The rainiest months in Sungai Merah are December, January, November, and October, with each month seeing an average of 13 inches of rainfall.