It's not raining up here in Seattle (Ballard) right now.
I take 99 home every day from work, no problems around 3pm, but I'm sure it got worse closer to the start time at 5pm.
And yes, the 5:30 start time is insane. That was the decision of the NFL, actually. They're shooting for prime time television audiences on the East coast, even though both teams are on the West coast.
Hopefully the weather will be better next Sunday for the Seahawks-Chargers game, since I'll be there.