D.C. Mayor Marion Barry announced yesterday that three outdoor city swimming pools will stay open an extra three hours each day for the rest of the summer.

Barry said the extension was due to the "extremely hot" summer weather. "My administration has tried to be not only competent but compassionate," Barry said at a news conference at the Kenilworth-Parkside pool, one of the three pools that will stay open longer.

The city's 19 outdoor pools normally are open from noon to 7 p.m. The closing time at the three pools affected by the change will be pushed back to 10 p.m.

The city pools that will stay open longer are Banneker, 2500 Georgia Ave. NW; Kenilworth-Parkside, Ord Street and Anacostia Avenue NE; and Oxon Run, Fourth Street and Mississippi Avenue SE.

The new hours will be in effect at Banneker every day except Thursday, at Kenilworth-Parkside every day except Wednesday and at Oxon Run every day except Friday.

Barry was joined at the news conference by City Council member H. R. Crawford (D-Ward 7), whose ward includes the Kenilworth-Parkside pool, and Alexis H. Roberson, the city's recreation director.

Roberson said the extra hours will cost about $14,000 and will not require the city to hire additional pool staff. She said the three pools were selected because a survey revealed they had a high demand for nighttime swimming.