fightclub34:
I was born and raised in San Francisco and lived and worked here my whole life accept for 1 year out of state. The weather has changed over time, but basically you can expect the following: Winter: 50's Spring: 60's Summer: 60's & 70's Fall: 60's & 70's. That being said, we do have a current heat wave where the temperatures have been in the 90's. However, the humidity is moderate. Oakland is a bit warmer as it is futher from the Pacific Ocean. The entire Bay Area is much larger and temperatures range up to triple digits further inland in the summer and 30's and 40's in the winter. No snow except on the mountain tops. Rain off and on from November through March/April although this year we had 41 of 45 straight days of rain in March/April.
As for housing, the Bay Area is the most expensive place to live in the country. If you wanted to live in SF, you could not find an apartment in a decent neighborhood for less then at least $1500 to $2000 per month and I may be low on that as I am long in the tooth and have owned my home for many years. Renting a home is definitely in the $3000 and up range. The only way to reduce that cost is to move inland to the East Bay. The North and South Bay are very similiar in cost. As for houses, the average median price home sells for over $600,000. You asked about salaries and my only guideline to you is that 6 figures is very common here but not for new graduates. Silicon Valley is loaded with computer graduates. How much you need to live on will depend on your overall expenses. If you have any other questions, don't hesitate to ask.