The climate in Surabaya is tropical year-round with an average temperature of 26.2 to 28.3 degrees Celsius. Best time to fly from Clark, Pampanga to Surabaya As the capital of the province of East Java, Surabaya as the second-largest city in the country has always been a busy trading port with many attractions around the city that is exciting to explore. In the Southeast Asia region, Indonesia has been the fastest when it comes to the growth of its tourism sector.