What's the weather like on the west coast of the United States in May?

The weather on the west coast of California is very good in May. The rainy season in winter has just ended. Otherwise, it rains every day and it is not safe to drive. In the season of lush vegetation, the temperature difference between day and night is very large. T-shirts are needed during the day and coats and sweaters are needed at night. You can search Chinese in Suzhou and Anhui, and there are also Chinese websites.