* Prospect of lower U.S. stockpiles briefly pushed up oil Tuesday
* Lower September U.S. demand, Asia slowdown weigh on prices
* Analysts expect oil prices to remain low
By Henning Gloystein
SINGAPORE, Aug 19 (Reuters) - Oil prices fell again after a brief rise in the previous session, as the United States enters the lower demand autumn season and Asia's leading economies slow down.
Oil prices edged up Tuesday, briefly ending a rout that dominated the last 6 weeks and pulled down prices by almost a third, after bullish economic data and the prospect of falling crude stockpiles in the United States.
But the price rise did not last into Wednesday, when both U.S. West Texas Intermediate (WTI) crude futures and internationally traded Brent fell in early trading in Asia.
"Any recovery in WTI prices from a six-year low may be short-lived with the U.S. entering the slow demand period in September," ANZ bank said on Wednesday.
U.S. crude futures were trading at $42.37 per barrel at 0040 GMT, down 25 cents from their last settlement. Brent LCOc1 was down 28 cents at $48.53 a barrel.
"The recent drop in the price of oil confirms ... the global commitment producers have to their current levels of output," said Scott Cockerham, managing director Houston-based Conway MacKenzie's Energy Advisory Services.
"Could we see $30 oil in the next 15 months? Absolutely, and headlines like China's recent yuan devaluation and the prospect of sanctions on Iran being lifted will only contribute to such volatility," he added.
Cockerham said a slowdown in U.S. drilling activity would not affect global supplies until 2017 and prices would likely remain low but volatile before then. (Editing by Richard Pullin)