What to wear to San Francisco in September?

In San Francisco in September, the average temperature during the day is about 23℃, and the average temperature at night is about 13℃. Therefore, it is recommended to wear cool and breathable clothes such as cotton and linen shirts, thin long skirts and thin T-shirts during the day, and warm clothes such as suits, jackets, coats, suits or thin sweaters at night. In addition, the weather in San Francisco is changeable, so it is recommended to take rain gear and long-sleeved coat with you to cope with the sudden wind and rain. Generally speaking, according to your body feeling and temperature changes, it is the key to choose clothes reasonably.