Palo Alto is very temperate and generally has good weather. Bring a warm sweater for nights and trips to foggy San Francisco. You'll see rain here Nov-Feb most years, and sun during the other months!
Camping/Beach/Outdoor Gear: The closest beaches to Palo Alto are about 30 min away in Half Moon Bay. The water is COLD but lots of people enjoy surfing in wet suits and kids often brave the waters in swim suits on a hot summer day.