If your brother is traveling the Pacific Coast Hiway, he is in little danger of being caught in a wildland fire. Most of the fires in WA, OR & CA are in the mountains on the eastern side of the states. Granted the likelihood of fires along the southern CA coast increases in late September, but at present there are none. This site has some excellent links to maps of geographic areas – try the NIFC National Fire News map of large fires, or GeoMAC; the NOAA site contains maps also.
P.S to all families of FFrs, remind the gals/guys to think SAFETY