Keep in mind that coastal highways have a trade-off. They alternate between wonderful vistas and tourist trap towns with stoplights at every block. So the trip can take quite awhile.
In my case, it started raining an hour into the drive and the rain was on-and-off for the next three days. This is the traditional weather pattern of Washington and Oregon so I wasn't really surprised but I wouldn't have minded not having any. (Weather-wise, the best time of year to visit the area depends on where you're going. You get the most number of clear days at Crater Lake in southwest Oregon in July. At Fort Clatsup in northwest Oregon and Olympic In northwestern Washington, it's September.) The rains, however, brought an end to clear visibility. That condition stuck with me for a lot of different reasons (smog, sand storms, forest fires, ocean mists) for the rest of the trip.
Despite the rain, it was still quite pretty. I went on a number of trails, watched the ocean burst upon the rocks, watched the little shellfish in the tidal pools, etc.
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