Weather will likely play an important role when you plan your trip to Santa Cruz, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually May and April with an average temp of 81°F, while the coldest months are January and February with an average of 78°F. The rainiest months in Santa Cruz are August, July, June, and September, with each month seeing an average of 23 inches of rainfall.