Too late? No, August is usually decent weather although the weather is unpredictable wherever you are.
A couple of comments regarding Seattle. Are you planning roundtrip from Seattle? If so most of your time will be sailing with fewer ports. Check the itinerary compared to a one way cruise. I know it's more money but you will see so much more.
Also the ships leaving from Seattle usually don't sail the inside passage which can mean rougher seas...and the scenery is not quite as good.
Hope this helps. Have a great trip!
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