Weather will likely play an important role when you plan your trip to Pekalongan, but bear 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 temperature of 28°C, while the coldest months are August and July, with an average of 27°C. The rainiest months in Pekalongan are February, January, December and March, with each month seeing an average of 453 mm of rainfall.