I've just checked the 5-day weather forecast weather forecast for Seattle. Highs to be in the mid-50s (13-17 degrees C.) through Wednesday, overnight lows in the low 40s (5-6 degrees C.), with a pretty good chance of rain every day. Well, it's Seattle, what do you expect?
Check Weather Underground/Seattle for updates.
I hope Bee is on her way there now, and not stuck in the airport in New York!