Planning for the weather is a good way to make your trip to Cannonvale relaxing and enjoyable, especially when you’re splurging. The hottest months are usually February and January with an average temp of 80°F, while the coldest months are July and August with an average of 70°F. The rainiest months in Cannonvale are March, January, February, and December, with each month seeing an average of 11 inches of rainfall.