Weather is probably a major factor when you plan your trip to Siwalankerto, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually October and September, with an average temperature of 29°C, while the coldest months are July and August, with an average of 28°C. The rainiest months in Siwalankerto are January, February, December and March, with each month seeing an average of 309 mm of rainfall.