Planning for the weather is an important factor for making your trip to Pekalongan a success, especially when you're splurging. 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.