In the PNW walking in the afternoon probably wont do the trick. You should use the Dminder app and get outside at solar noon (1pm). Sadly there is only a coupl

In the PNW walking in the afternoon probably wont do the trick. You should use the Dminder app and get outside at solar noon (1pm). Sadly there is only a couple of weeks left in the PNW where you can get any useful level of vitamin D (not because of rain but because of the suns position in the sky). However if you try again next summer and get to a high level, it takes sometime to drop over winter.