Weather is probably a major factor when you plan your trip to Santa Maria, 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 82°F, while the coldest months are January and February with an average of 78°F. The rainiest months in Santa Maria are August, July, June, and September, with each month seeing an average of 22 inches of rainfall.