Planning for the weather is a good way to make your trip to Wonosobo relaxing and enjoyable, especially when you're splurging. 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 Wonosobo are November, December, February and April, with each month seeing an average of 620 mm of rainfall.