Planning for the weather is a good way to make your trip to Pedro Juan Caballero relaxing and enjoyable, especially when you're splurging. The hottest months are usually December and January with an average temp of 76°F, while the coldest months are July and June with an average of 65°F. The rainiest months in Pedro Juan Caballero are January, February, December, and October, with each month seeing an average of 9 inches of rainfall.