Weather is probably a major factor when you plan your trip to Dieng, 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 23°C, while the coldest months are August and July, with an average of 22°C. The rainiest months in Dieng are November, December, February and April, with each month seeing an average of 620 mm of rainfall.