i will be visiting Jiuzhaigou on 15th Jun for about 2 days. Is it rainy season ? how is the scenery?

Yeah, it will be during the rainy season then. The scenery is still very nice, but the roads may be a little slippery, which may more or less influence your visiting. Anyway, just pay attention to the weather reports. Perhaps you will also get cloudy days instead of rain. Good luck!