What clothes should I bring when traveling to the United States with a group in September and early October?

1) Introduction to the weather in the United States in September and October:

The average temperature in September and October in the United States is about 25 degrees. The climate in most areas of the United States is temperate and subtropical. Suitable and abundant rainfall. Due to the vast territory and diverse topography of the mainland, climate change is relatively complex. The southern tip of the Florida Peninsula is tropical. Alaska is located between 60 and 70 degrees north latitude and belongs to the cold climate zone within the Arctic Circle; Hawaii is located south of the Tropic of Cancer and has a tropical climate.

2) What to wear in September and October in the United States:

Please bring a coat with you in summer. In winter, the weather is cold, so please keep warm. There is a big temperature difference between morning and evening. There is no need to bring a thick coat with you in Hawaii, where the temperature is 25-32 degrees all year round. You only need to bring a thin coat for backup in the morning and evening. Please pay special attention to regular West Coast routes to Los Angeles, Las Vegas, and San Francisco. Long-sleeved jackets are also required in San Francisco during spring and summer. Please bring a thick coat in autumn and winter, especially when it is windy on the Golden Gate Bridge. If you go to scenic spots in national parks such as Yellowstone before early May or after mid-September, be aware that there is a big temperature difference between morning and evening, so you need to bring a thick jacket.

3) Recommended travel seasons in the United States:

The weather in spring and autumn is the best in the United States. These two seasons are neither too cold nor too hot, and hotel prices are lower. In contrast, there will be more tourists traveling in the summer and hotel prices will be higher. Winter is colder and is a good season if you want to go skiing.