Average Teacher Salary in Washington State. The average teacher salary in Washington State in 2009 was $54,033, according to the Bureau of Labor Statistics. This was a 1.6 percent increase from the previous year, when the average teacher salary in Washington State was $53,205. Teaching salaries in Washington State have consistently surpassed the national average, which was $49,720 in 2009 and $48,353 in 2008.