The Brani container terminal and the Keppel container terminal stand in this aerial photograph taken above Singapore on July 2, 2015.

Singapore's exports in August stalled and though sales to the United States picked up, underlying weakness in overseas demand is expected to maintain pressure for further stimulus to shore up the stuttering trade-dependent economy.

Non-oil domestic exports (NODX) registered flat growth last month from a year earlier, the trade agency International Enterprise Singapore said in a statement on Friday.