Taking the local weather in Lasem 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 September and October, with an average temperature of 28°C, while the coldest months are July and August, with an average of 26°C. The rainiest months in Lasem are February, March, January and December, with each month seeing an average of 398 mm of rainfall.