Planning for the weather is an important factor for making your trip to Purwokerto a success, especially when you’re splurging. The hottest months are usually March and April with an average temp of 80°F, while the coldest months are August and July with an average of 77°F. The rainiest months in Purwokerto are January, December, February, and March, with each month seeing an average of 18 inches of rainfall.