Went to Berkeley, California during the summer vacation. What was the weather like then?

I study in Berkeley, and I have classes in summer ~ In fact, because Berkeley is close to the sea, the weather is generally cooler than in other cities, but because the campus roads are not easy to walk (all slopes are like climbing mountains). . . ), it may be hot. But no matter how cool the weather is, it is still summer. The sun in California is quite poisonous. If you are afraid of the sun, you can try wearing a thin coat to protect yourself from the sun. The weather in northern California is not boring even if it is hot. I often wear long-sleeved shirts in summer. Basically, short sleeves, shorts, trousers and thin coats can be taken, and shoes should be comfortable to walk, otherwise it will hurt when walking on campus. The weather in California is very different from day to night. Even if you go out at night or in the morning on a hot day, it will be a little cold. You need a coat. The air conditioning in the school library is sometimes quite fierce, so it is better to bring a coat.