Mark Twain once said, 'The coldest winter I ever spent was a summer in San Francisco.' Summers in the City can be very foggy and windy. It's not unusual to see people wearing ski parkas in Fisherman's Wharf after the fog rolls in.
Also, the weather can be different depending on what neighborhood you are in. Be prepared for anything, dress in layers: water-resistent windbreaker, sweatshirt with hood, shirt and undershirt. (Use your daypack as a closet, not for storing valuables.)
And wear long pants & comfortable shoes. In this City, only tourists wear shorts.
Clothing/Shoes/Weather Gear: San Francisco is generally NOT hot in the summer. There is often fog, which can burn off in the middle of the day. Bring a sweater or light jacket that you can remove as the day goes on. Locals don't wear shorts in the City too often (unless they are exercising).
You never know quite what to expect with regards to weather in various parts of San Francisco. I have worn a tank-top and been fine and then had to throw on a sweater and jacket just a few hours later. Also, the East Bay (Berkeley, Oakland, etc) tends to be a lot warmer than in San Francisco, which is good to keep in mind.
Photo Equipment: Brings lots of film, or a large memory card and battery charger, since you will find many beautiful spots throughout the Bay Area.
Clothing/Shoes/Weather Gear: Make sure you pack a fleece or a cardigan as it often starts out bright and sunny but gets chiller in the afternoons/evening. Also if you are planning on going on the cable cars they can be a bit chilly!
Clothing/Shoes/Weather Gear: Bring layers if you're going to San Fran-- all times of the year. Mark Twain once said "the coldest winter I ever spent was a summer in San Fransisco." And he wasn't kidding. Although it can get very warm in the sun, when that fog starts rolling in, I've seen the temperature drop 20 degress in a few hours.
For most any time of year, pack layers when going to SF. The summer can bring cold OR hot weather. If days are hot, typically nights cool off very quickly and light jackets are in order.
In the winter, it can be cold and rainy one day and moderate and humid the next. so...Be prepared is the best advice.
Photo Equipment: Anything available...SF is very picturesque
Luggage and bags:
Whatever you'd generally use.
Clothing/Shoes/Weather Gear: Bring layers of clothes, and don't forget windbreakers and/or pullovers. Especially if you're visiting in the Summer. This is not Southern California, and San Francisco can be downright chilly in the Summertime. Spring and Autumn are the best time of year for warm weather.
Luggage and bags:
Something to keep warm a sweater you can carry. A sweatshirt you can take off.
Clothing/Shoes/Weather Gear: Good shoes are always welcome when on holiday.
Photo Equipment: Two batterys one to use one on charge.
Everyready to change one when it's done.
You don't wish to miss that picture.
Clothing/Shoes/Weather Gear: Take warm clothes, even in the summer. You'll definitely need a jacket at night, and even during most summer days. The average high temperature in July in San Francisco is 18 Celsius (65 Fahrenheit), and there is often a stiff breeze.
Layering is a must. When we were walking in the city, at one point we'd be sweating standing in the sun, but waiting for the trolley in the shade, we were freezing! Comfortable shoes required & be prepared for rain/fog.
Photo Equipment: 400 speed film as it is cloudy a lot.
Clothing/Shoes/Weather Gear: Probably everyone has told you so already, but remember to bring some clothes for layering (undershirts, sweaters, light jackets) regardless of the time of the year. In summer, the fog usually rolls in at dusk and it gets very cold, VERY fast. Even if you are down in San Jose and decide to drive up for the evening, remember that there can be up to 30 degrees difference between the two cities (I took to leaving a jacket in my car trunk full time when I lived in San Jose, just in case I decided to drive up to the city on a whim). Winter is a bit more even, but it's cold throughout, 40s and such, so you may want to bring some sweaters and of course rain gear (from Dec to Feb we get all our rain here)
Luggage and bags:
Don't make the mistake we did and think that because you are travelling to California in August you wont need any warmish clothes. In fact in San Francisco down by the sea the wind whipped up and it was really cold. I had a cardigan (thankfully) but it really still was'nt enough.
Clothing/Shoes/Weather Gear: Take good comfy shoes for walking and pack a fold up brolly in case it rains, or if not and the sun is too hot, you can use it as a parasol.
Toiletries and Medical Supplies: Unless you need certain prescribed medicines you will be able to find whatever you are requiring when you get here.
Photo Equipment: Films for camera/batteries are widely available at much the same price.
Miscellaneous: If it is hot, take (or buy one here) one of those little mini fans to cool you down.
Just bring clothers so that you can dress in layers. Mornings could be nice, mainly in the Mission were is almost sunny, but wet fog and wind can turn suddenly around 2pm so take with you a sweater or a good rain coat.
Comfortable shoes too. Tram system is pretty good but, figure out to walk on crooked streets, mostly with steps too...
Clothing/Shoes/Weather Gear: Everyone says it, and you should believe them! The weather in San Francisco can change quickly, especially if you move from one neighborhood to another, and you should prepare for this. In the evenings in particular, it can cool down fast - and really get chilly if you've decided you didn't need that extra layer earlier in the day!
Luggage and bags:
Whatever you feel comfortable packing all of your stuff into should be fine.
Clothing/Shoes/Weather Gear: I know this is sunny California but be sure to bring warm clothese. SF at any time can be windy and foggy. Even in the summer. When it's hot in the cities outside of SF people head to SF to cool off.
Toiletries and Medical Supplies: They have everything you need here. It's a modern city you know. Just bring the perscription stuff.
Photo Equipment: If you can't find it in SF it probably doesn't exist.
Camping/Beach/Outdoor Gear: tents, sleeping bags and gear for coldish weather. SF and the coast can be cold, windy and foggy all year round.