Weather is probably a major factor when you plan your trip to Ambarawa, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually September and October, with an average temperature of 25°C, while the coldest months are July and August, with an average of 24°C. The rainiest months in Ambarawa are February, January, March and December, with each month seeing an average of 582 mm of rainfall.