TL;DR It's between $4,923 and $10,924 USD / month
I'm also assuming you mean the California State University system.
Well, CSU have a Salary Schedule database, which you can search. The appropriate search term seems to be FACULTY. This gets you a whole number of records, with different qualifications for programs, disciplines etc. But the basis-of-the-basis is:
Class Range Effective Date Class Title Min Salary Max Salary CBID Status
2360 3 2018-10-31 INSTRUCTIONAL FACULTY - ACADEMIC YEAR $4,923.00 $10,924.00 R03 Active
and if you click through the position code, as @user71659 suggests, you get to this page. It tells you this position is that of an Assistant Professor for the Academic Year. It also has the pay scale.
Note that even then the database shows a salary range, i.e. a minimum and maximum salary. I have no idea what determines where in the range you end up. Perhaps it's managerial flexibility in hiring? Who knows.
You can also contact their (general) HR department and verify, or be more specific (department, program etc.): Their phone is (562) 951-4411 and there's also a web contact form.