It is sunny and hot in Wutaishan then at daytiem, but the temperature drops a lot at night. You can take shorts plus a long over coat to there. However, you have to take long jeans and a thick cotton jacket if you plan to climb to the top. There are direct trains from Wutaishan to Beijing. It takes about 7 hours and the ticket fare is about CNY100-150. If you hire a private car from Wutaishan to Beijing, it also takea about 7 hours, but you have to pay for more.