### Instruction: What outfit should I wear when traveling to San Francisco in May?
### Response: The weather in San Francisco tends to vacillate between cool and warm temperatures. In order to dress appropriately and be comfortable all day, you should dress in layers. Start with a good pair of jeans, a t-shirt and a lightweight sweater. For your outerwear, choose a puffer jacket to add some insulation in case the wind picks up. Finally, San Francisco is best explored on foot, so wear a comfortable pair of sneakers.