Visiting local bars in Santa Maria is better when you know what the weather holds. These temperatures and rainfall averages can help you decide the best time for bar hopping. The hottest months are usually January and December with an average temp of 73°F, while the coldest months are July and June with an average of 56°F. The rainiest months in Santa Maria are January, February, December, and March, with each month seeing an average of 7 inches of rainfall.