If you have glasses that can get ruined in the rain, maybe look into some of the ebike helmets with eye protection, like this one from Lazer or this one from lumos. There are probably others from similar brands, these are just two I know of off hand. Likewise, for rain, there’s ponchos/raincapes. They’re more for bikes, but they should be fine for scooters, too. If ponchos are too dorky, a good pair of rain pants and a rain jacket will be useful not just for your scooter, but day to day outdoor stuff in the pnw.