On Saturday I'll be travelling to the USA for the first time. My partner and I will be spending one week in SF, and one week in NY. We might also take a short trip to Yosemite National Park, and another one to Washington D.C.

The thing is, I need to choose the right clothes for the trip, and I would really appreciate your help.
NY currently has a similar winter climate to the one we have in Europe, so I've got some idea about what to wear. San Francisco on the other hand is a complete mystery to me.

What to wear in SF right now? Sleeveles tops, short sleeves, long sleeves, blazers, a leather jacket, a trench coat? Layers?
I checked the weather forecast (mostly sunny), but since the same temperature can feel very different in different places because of other factors (wind, humidity, etc.) I'm no closer to figuring out my travel capsule.

What would you wear in SF at this time of the year?