According to FRED’s economic data, California's average interest on a 15-year fixed-rate mortgage (FRM) is 4.38%, lower than the national average of 4.92%. Interest on a 30-year FRM in the state is 5.18%, again below the national average of 5.81%. And whereas a 5/1 adjustable-rate mortgage (ARM) in California currently has an average interest of 4.03%, the national average is higher at 4.41%.
Understand that a "good rate" is subjective and must take into account various aspects, such as loan terms, loan amount, credit score, income and debts. Mortgage interest rates also fluctuate almost every day. Do not be surprised, therefore, if a lender’s estimate changes from one week to the next.
The bottom line: to ensure you're getting your own best possible rate, it's important to compare quotes from several lenders.