Dear Li, I don't think that any wind storm will happen in Beijing becauset this is an inland city. In my opinion, October is the best time to come to Beijing. The temperature is the most comfortbale in a yeat, just coming to fall although dry a little. A sweater or tee-shirt is enough in the daytime. And the Fragrant Hill noted for red maple leaviest is in the best season for view. Coming to Nov, the daytime becomes shorter while the dark night is coming earlier. BTW, I think it is a little colder for going outside then. Oh, the temperature difference between daytime and night may a little higher in OCt, too! And, please escape from China's National Holiday in the first week of Oct.