Weather will likely play an important role when you plan your trip to Avon, 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 78°F, while the coldest months are January and February with an average of 54°F. The rainiest months in Avon are August, September, July, and November, with each month seeing an average of 8 inches of rainfall.