Students give Stanford overwhelmingly positive marks for weather. With the exception of winter, it is pretty much always sunny on campus, in the perfectly comfortable 60- to 75-degree range. While winters can be rainy, they vary from year to year. Summers can actually get pretty hot, even if humidity is always reasonably low. It may get cold at night, but it’s nothing compared to the weather in the Northeast. In general, the weather is great. The only time you will see snow is when your dorm takes a ski trip to Tahoe.
Maybe it’s the weather, or maybe the prevailing California attitude, but be prepared to dress pretty light and informally throughout your time at Stanford. Expect to see shorts, T-shirts, and flip-flops for a large majority of the school year.