need I take rainproof with me if I travel in Tibet during its rainy season

The rainy season in Tibet is mainly from June to August and it does have a very bad impact on the roads. However, there are many track maintenance workers and local army would also give help to restore the roads. Generally speaking, it only takes a few hours to make the roads feasible again. As for the rainproof, you are suggested to take raincoat, rain-proof trousers and shoes if you want to trek, climb the mountain or ride a bike as part of your Tibet tours. If you have some tours to Tibet organized by some travel agencies, usually you don’t need to take rainproof with you, because Tibet often rains at night and the weather is quite good in the daytime. Besides, the tourist bus is always along with you. So, if you do worry about the rainy season in Tibet, you may choose to travel in Tibet in other time, or let’s say now, now is the best time to travel to Tibet. I think you can just apply for Tibet travel permit and arrange your schedule as for how to travel in Tibet.