"We're not there yet and not quite ready to begin that phased new opening," Bowser said at a news briefing.
The city, she said, is looking for a 14-day decline in new coronavirus cases, but so far has only seen a four-day decline.
The order was previously scheduled to expire on May 15.
Washington, D.C. has reported a total of 6,584 confirmed cases, with 350 deaths, according to a count by the municipal government.
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