What price you expect bitcoin by 30 September?
According China Exchanges Shut down and China miners Ban
The price should be fairly constant, above $3k but below $4k.
Don't expect too big of a pump before the end of the month but i'm sure that by next month there will be a new round of pumps. Fact is that people have already acted on the news so a big selloff at the end of the month when the exchange closes down is unlikely.
But as i said, expect sideways movement in the short term.