Weather will likely play an important role when you plan your trip to Pekalongan, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually October and May with an average temp of 83°F, while the coldest months are August and July with an average of 81°F. The rainiest months in Pekalongan are February, January, December, and March, with each month seeing an average of 18 inches of rainfall.