The end of Sept on the coast is a hard time due to lack of rain. In Northern Cal the only show is the Klamath. There will be some fish in tide water in some of the rivers but there are alot of factors involved.
The oregon coast has some interesting lakes in the dunes that are worth checking out. Get a copy of Sheehan's Fishing in Oregon.
Shawn gave sound advice on the OP, personaly that is where I would spend my time. I would recommend Jerry French as a guide around the area of the Fork's. http://frenchsflyfishing.com/aboutus.aspx
Fishing is always good, the catching may not be.
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