Weather will likely play an important role when you plan your trip to Vallarga, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually July and August with an average temp of 51°F, while the coldest months are January and February with an average of 21°F. The rainiest months in Vallarga are August, July, June, and May, with each month seeing an average of 10 inches of rainfall.