I want to know about the weather in Jiuzhaigou, Huanglong and Xiaoyao from June 15 to June 18.

Tourists with high blood pressure and heart disease can only go to Jiuzhaigou. Huanglong and grassland are too high and risky.

Jiuzhaigou is 1900~3 100 meters above sea level, which belongs to the plateau humid climate, and the top of the mountain is covered with snow all year round. The temperature in June is cool and pleasant and relatively stable, with an average temperature of 19~22℃. Pay attention to sun protection, the ultraviolet rays at high altitude are strong, the temperature difference between morning and evening is large, and it is cold at night. Bring more clothes and a thin sweater.