Fall is a fantastic season to visit the Pacific states because the temperatures will be cooling off, but the days are still long and sunny. The foliage will be changing into vibrant colors, and prices and tourist numbers will be decreasing from the peak summer season.
You can participate in Napa and Sonoma’s grape harvests during these months. All of the National Parks and roads will still be open. And you can experience the Monterey Jazz Festival.
The north will start to see snow and rain in late-October and November, but Southern California will still be sunny and dry.
In Winter, you can head inland to the mountains for snow. Or you can head to the deserts for mild weather. The coasts will be cold, but snow is rare.
Winter is the low travel season for the Pacific, so prices and tourist numbers will be at some of their lowest. The exceptions to this are during Christmas and New Year’s.
Some National and State Parks will have trail or road closures, so make sure you check in advance whether a trek or drive is open.
Spring is a beautiful time to visit the west coast. The warm, pleasant days and refreshingly cool nights make these months an excellent time to visit. Wildflowers will be blooming, especially the cherry blossoms in Washington.
All roads and trails will re-open, and as long as you avoid the peak Spring Break weeks from mid-March to early April, the crowds and prices will still be relatively low.
You’ll want warm layers for the mornings and evenings in the mountains.
Summer days are sunny and hot. Daytime temperatures can be in the 90s (24-28°C), and temperatures will be even higher in the deserts. The nights will be pleasant for camping out under the stars.
The higher elevations can still be chilly in the mornings and evenings, so bring a couple of layers with you.
This is prime beach season. But be aware that, like most places in the U.S., summer is the peak travel season because of school breaks, so crowds and prices will be at their highest.