I'm going to Prague on July 20th. What's the weather like there and what kind of clothes should I pack ?

I tell you the weather on July 13th and 14th: cool in the morning, heavy rain, hot at noon, cold enough to shiver within one day, and hot enough to burn your neck. Foreigners' clothing can also show four seasons. You can bring a thin jacket, short-sleeved T-shirt inside, and prepare an umbrella and sunscreen.