Taking the local weather in Gantisan into account is an important factor for planning your visit, especially if you plan to spend your trip by the pool. The hottest months are usually May and June, with an average temperature of 26°C, while the coldest months are February and January, with an average of 25°C. The rainiest months in Gantisan are January, November, December and May, with each month seeing an average of 373 mm of rainfall.