LONDON - Oil prices fell on Thursday as investors weighed tight supplies against the prospect of a large U.S. rate hike that could stem inflation and curb crude demand.

Brent crude futures for September were down 18 cents to $99.39 a barrel at 0727 GMT after settling below $100 for the second straight session on Wednesday.

U.S. West Texas Intermediate crude for August delivery was at $95.84 a barrel, down 43 cents.

Oil prices have tumbled in the past two weeks on recession concerns despite a drop in crude and refined products exports from Russia amid Western sanctions and supply disruption in Libya.

"It is all sentiment driven at the moment and that has caused most of the losses seen in oil markets over the last few weeks," said Howie Lee, an economist at Singapore's OCBC bank.

"I don't see any significant changes in oil supply fundamentals and that is probably why we still see Brent holding around the $100 level."

The U.S. Federal Reserve is seen ramping up its battle with 40-year high inflation with a supersized 100 basis points rate hike this month after a grim inflation report showed price pressures accelerating.

The Fed rate hike is expected to follow a similar surprise move by the Bank of Canada on Wednesday.

Investors also flocked to the dollar, often seen as a safe haven asset. The dollar index hit a 20-year high on Wednesday, which makes oil purchases more expensive for non-U.S. buyers.

Worries of COVID-19 curbs in multiple Chinese cities to rein in new cases of a highly infectious subvariant have also kept a lid on oil prices.

China's daily crude oil imports in June sank to their lowest since July 2018, as refiners anticipated lockdown measures to curb demand, customs data showed on Wednesday.

Data from the U.S. Energy Information Administration also point to slackening demand, with product supplied slumping to 18.7 million barrels per day, the lowest since June 2021. Crude inventories rose, bolstered by another big release from strategic reserves.

U.S. President Joe Biden will on Friday fly to Saudi Arabia, where he will attend a summit of Gulf allies and call for them to pump more oil.

However, spare capacity at the Organization of the Petroleum Exporting Countries is running low, with most of the producers pumping at maximum capacity, and it is unclear how much extra Saudi Arabia can bring into the market quickly.

(Reporting by Julia Payne in London Additional reporting by Florence Tan in Singapore Editing by Himani Sarkar and Mark Potter)