San Francisco peas-- need advice about clothing for a trip

It probably won't rain much if at all. As for the weather it can get chilly, so bring light jackets. You should be fine with shorts/capris and a light jacket. Napa will be warm though.

We will be in SF in mid August & just today I bought dd (12) a new lightweight rain jacket, now all 4 of us have new jackets ready for our trip. It's been a while since dh & I were there (ok, in all honesty it's 20 years since we were there on our honeymoon!) but we're coming ready for all possible weathers with plenty of layers. Very excited!

Layers. SF will be cold and foggy most likely. You'll want pants and a lightweight jacket. Regular summer clothes for Napa.

My sister wouldn't believe me when I told her to bring warm clothes when she visited us on July 4 a few years ago. She's now the proud owner of a ridiculously overpriced San Francisco fleece jacket. Definitely save some money and bring your own

I went to San Francisco in mid-August. No rain, but it was even colder than I'd been warned. I wore my one pair of loooong pants and a jacket the whole time, and insisted we stop and buy KNEE SOCKS to wear with my sandals. (Fashion be damned.) All the local women wore boots or closed toe shoes - and much different clothing than the tourists. 

When you cross the bay, it's a completely different world.

The chances of rain in July or August are sort of slim to none. But yes, in the city or along the coast, it can get very cold for summer. The rest of the Bay Area will usually be warm to hot (cool/foggy in the AMs except for the hottest days).

It was wonderful! I had such a great time! Saw most of the touristy stuff, went to 3 shows: Book of Morman, Kinky Boots and Hedwig and the angry inch. Ate and shopped. Loved every minute

Cool to cold in San Francisco, probably HOT in Napa and I hope I don't ruin your vacation but I am praying nightly for rain.

so not only does the weather change depending on neighborhood, it changes based on time of day. western sf...(where I live.) I am seeing sun for the first time in 5 days. total ground hugging fog...55-60 degrees with a wind. eastern side of sf...sunny and 65-70. come 3-4 pm the wind starts stronger...and esp downtown, and other wind tunnel areas...the wind gets up to 15-25 mph..and the fog rolls east and it can get very very cold.

so bring long pants and shoes and light jackets. rain jackets are not needed. it will not rain til oct. . napa can be 75-95. dress for very warm weather...not too humid. we run around with a hoody or fleece jacket all year long. capri pants are for tourists along with shorts... you might throw in a scarf. I never wear shorts. my kids wear them with their hoodies.

My kid goes to SFSU..this pic was on their FB page a few days ago. LOL! When we went for her orientation last July, we got in the elevator of the parking structure with a lady wearing leather boots and a heavy coat and knew we were in trouble. 5-10 miles out from the city in any direction the temp will be over 80! Have fun!