Taking into account the local weather in Tarma is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually November and October with an average temp of 49°F, while the coldest months are July and August with an average of 46°F. The rainiest months in Tarma are February, January, December, and March, with each month seeing an average of 14 inches of rainfall.