Our year-round *summer* item here in San Francisco could easily be gloves (okay and scarves too). This week might be a little warmer, but at any given time, you turn your head away for a minute and bam! fog. I love the foggy summer, but other people have a hard time becoming fans of the gray summers. Sure we have some sunny days, but they come later in September-Oct. One thing that remains constant all year, is that it never hurts to pack with you an extra layer, your scarf and a pair of gloves. Your hands go from super sweaty to cold in a snap. If it is 80° at noon, it might be 55° at night. And you need a good grip to climb those hills.