Washington: Today - Mostly sunny, high in mid to upper 80s, low in low to mid 60s. Chance of rain 20 per cent through tonight. Monday - Partly cloudy, high in low to mid 70s.

Maryland: Today - Partly cloudy, highs from 70s along coast to near 90 elsewhere, lows in 50s. Monday - Partly cloudy, high in 70s.

Virginia: Today - Partly cloudy, highs from 70s along coast to near 90 elsewhere, lows in mid 50s to mid 60s. Chance of rain in southwest. Monday - Partly cloudy, chance of rain in southwest, highs in 70s to low 80s.

Lower Potomac and Chesapeake Bay: Today - Fair with visibility of 5 miles or more through tonight. Winds should be variable at about 5 knots this morning and evening and up to 12 knots during the day.

Extended Area Outlook: For Tuesday through Thursday - Chance of rain through Wednesday followed by partly cloudy skies. Highs in mid 70s to mid 80s, lows in mid 50s to mid 60s through the period. Washington's normal temperature range for this time of year is from 81 to 61.

Atlantic Ocean Beaches from Cape May through Maryland: Today - Partly cloudy and breezy, highs near 70. Monday - Partly cloudy and breezy, highs in 60. Water temperatures should range from mid 50s in north to low 60s in south both days.

Atlantic Ocean Beaches from Virginia to Cape Hatteras: Today - Mostly sunny, highs near 80. Monday - Partly cloudy, high in 70s. Water temperatures should range from low 60s in north to upper 60s in south both days.

West Virginia: Today - Partly cloudy, highs in mid 70s to mid 80s, lows in upper 40s and 50s. Chance of rain tonight. Monday - Partly cloudy with chance of rain, highs in 70s.

The National Weather Forecast for Today - Showers will continue along the south half of the Atlantic Coast and over Florida. Showers will be scattered over northern New England and the lower Missouri Valley. Temperatures will be cool over northern Maine, also from the upper Missouri Valley across the northern half of the Rockies through the northern half of the Pacific Coast. It will be mild in the Northeast. Temperatures will be warm from the remainder of the Atlantic Coast through the Mississippi Valley, across Oklahoma and Texas. Elsewhere, It will be seasonably mild.

Almanac data for Sunday, May 29 - Sun rises 5:47 a.m., sets 8:24 p.m.; moon rises 4:50 p.m. sets 3:22 a.m.

Tides: High 5:23 a.m. and 5:49 p.m., low 12:28 p.m. and 12:34 a.m. High and low tides at the following locations can be obtained by subtracting the hours indicated from the tides above: Annapolis (3 1/2); Bloody Point Lighthouse (4 1/2); Deale, Md. (4 1/2); Colonial Beach (6); Norfolk (1 1/2); Virginia Beach (1); Solomons Island (6 1/2); Point Lookout (7).

The Council of Governments' Air Quality Index for yesterday showed the high reading in the Washington area during the noon to 1 p.m. period was 105 for the pollutant, photochemical oxidants. Index values between 100 and 249 indicate hazardous air quality. When the index exceeds 100 the air becomes hazardous and persons with lung, heart and eye problems should restrict their activity.

The National Weather Service forecasts that the Potomac River stage at Little Falls will remain near 3.1 feet through today. Local Temp., Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 mid.(COLUMN)71(COLUMN)66 1 a.m.(COLUMN)70(COLUMN)68 2 a.m.(COLUMN)69(COLUMN)68 3 a.m.(COLUMN)68(COLUMN)73 4 a.m.(COLUMN)68(COLUMN)76 5 a.m.(COLUMN)66(COLUMN)84 6 a.m.(COLUMN)65(COLUMN)81 7 a.m.(COLUMN)66(COLUMN)76 8 a.m.(COLUMN)70(COLUMN)71 9 a.m.(COLUMN)75(COLUMN)60 10 a.m.(COLUMN)79(COLUMN)52 11 a.m.(COLUMN)82(COLUMN)49 12 noon(COLUMN)84(COLUMN)48 1 p.m.(COLUMN)87(COLUMN)35 2 p.m.(COLUMN)88(COLUMN)34 3 p.m.(COLUMN)88(COLUMN)38 4 p.m.(COLUMN)88(COLUMN)38 5 p.m.(COLUMN)88(COLUMN)38(END TABLE) Temperatures ending 8 a.m. (EDT) Yesterday(TABLE) Cit(COLUMN)H.(COLUMN)L. Albany(COLUMN)80(COLUMN)59 Albuquerque(COLUMN)81(COLUMN)49 Amarilo(COLUMN)83(COLUMN)55 Anchorage(COLUMN)58(COLUMN)44 Asheville(COLUMN)79(COLUMN)59 Atlanta(COLUMN)80(COLUMN)67 Atlantic City(COLUMN)81(COLUMN)63 Austin(COLUMN)83(COLUMN)72 Baltimore(COLUMN)87(COLUMN)58 Billings(COLUMN)67(COLUMN)43 Birmingham(COLUMN)81(COLUMN)67 Bismarck(COLUMN)71(COLUMN)50 Boise(COLUMN)59(COLUMN)37 Boston(COLUMN)81(COLUMN)60 Brownsville(COLUMN)90(COLUMN)74 Buffalo(COLUMN)80(COLUMN)57 Burlington, Vt.(COLUMN)71(COLUMN)52 Casper(COLUMN)68(COLUMN)35 Charleston, S.C.(COLUMN)81(COLUMN)70 Charlotte, N.C.(COLUMN)77(COLUMN)64 Cheyenne(COLUMN)65(COLUMN)43 Chicago(COLUMN)81(COLUMN)62 Cincinnati(COLUMN)85(COLUMN)60 Cleveland(COLUMN)78(COLUMN)49 Columbia, S.C.(COLUMN)85(COLUMN)60 Charleston, W.V.(COLUMN)87(COLUMN)56 Columbus, Ohio(COLUMN)86(COLUMN)60 Dal.-Ft. Worth(COLUMN)96(COLUMN)73 Dayton(COLUMN)87(COLUMN)59 Denver(COLUMN)75(COLUMN)44 Des Maines(COLUMN)90(COLUMN)63 Detroit(COLUMN)85(COLUMN)48 Duluth(COLUMN)78(COLUMN)55 El Paso(COLUMN)88(COLUMN)67 Fairbanks(COLUMN)59(COLUMN)26 Fargo(COLUMN)80(COLUMN)62 Flagstaff(COLUMN)68(COLUMN)34 Great Falls(COLUMN)57(COLUMN)33 Hartford(COLUMN)84(COLUMN)62 Helena(COLUMN)56(COLUMN)32 Honolulu(COLUMN)84(COLUMN)74 Houston(COLUMN)91(COLUMN)72 Indianapolis(COLUMN)88(COLUMN)62 Jackson, Miss.(COLUMN)89(COLUMN)67 Jacksonville(COLUMN)84(COLUMN)61 Juneau(COLUMN)65(COLUMN)46 Kansas City(COLUMN)82(COLUMN)63 Las Vegas(COLUMN)89(COLUMN)64 Little Rock(COLUMN)89(COLUMN)68 Los Angeles(COLUMN)73(COLUMN)57 Louisville(COLUMN)88(COLUMN)64 Memphis(COLUMN)89(COLUMN)71 Miami Beach(COLUMN)83(COLUMN)71 Midland(COLUMN)97(COLUMN)65 Milwaukee(COLUMN)75(COLUMN)54 Mpls-St. Paul(COLUMN)88(COLUMN)62 Nashville(COLUMN)86(COLUMN)68 New Orleans(COLUMN)92(COLUMN)68 New York(COLUMN)86(COLUMN)67 Norfolk(COLUMN)79(COLUMN)53 North Platte(COLUMN)76(COLUMN)48 Oklahoma City(COLUMN)80(COLUMN)66 Omaha(COLUMN)77(COLUMN)61 Orlando(COLUMN)84(COLUMN)66 Philadelphia(COLUMN)85(COLUMN)59 Phoenix(COLUMN)92(COLUMN)68 Pittsburgh(COLUMN)83(COLUMN)50 Portland, Me.$73(COLUMN)42 Portland, Ore.(COLUMN)59(COLUMN)47 Providence(COLUMN)78(COLUMN)55 Raleigh(COLUMN)82(COLUMN)59 Rapid City(COLUMN)77(COLUMN)44 Reno(COLUMN)70(COLUMN)32 Richmond(COLUMN)85(COLUMN)53 St. Louis(COLUMN)88(COLUMN)69 St. Prbg-Tampa(COLUMN)88(COLUMN)72 Salt Lake City(COLUMN)63(COLUMN)49 San Antonio(COLUMN)83(COLUMN)72 San Diego(COLUMN)69(COLUMN)61 San Francisco(COLUMN)61(COLUMN)51 San Juan, P.R.(COLUMN)83(COLUMN)75 St. Ste Marie(COLUMN)82(COLUMN)51 Seattle(COLUMN)60(COLUMN)46 Shreveport(COLUMN)90(COLUMN)65 Sioux Falls(COLUMN)73(COLUMN)57 Spokane(COLUMN)54(COLUMN)41 Syracuse(COLUMN)84(COLUMN)64 Topeaka(COLUMN)80(COLUMN)63 Tucson(COLUMN)89(COLUMN)61 Tulsa(COLUMN)88(COLUMN)70 Washington(COLUMN)88(COLUMN)64 Wichita(COLUMN)78(COLUMN)60(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)T. Aberdeen(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)68 Amsterdam(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)70 Ankara(COLUMN)cloudy(COLUMN) 3 p.m.(COLUMN)73 Athens(COLUMN)clear(COLUMN) 2 p.m.(COLUMN)77 Auckland(COLUMN)cloudy(COLUMN)midnight(COLUMN)54 Berlin(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)70 Birmingham(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)70 Brussels(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)70 Cairo(COLUMN)cloudy(COLUMN) 2 p.m.(COLUMN)106 Casablanca(COLUMN)clear(COLUMN)noon(COLUMN) 68 Copenhagen(COLUMN)clear(COLUMN) 1 p.m.(COLUMN) 68 Dublin(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN) 61 Geneva(COLUMN)clear(COLUMN) 1 p.m.(COLUMN) 63 Hong Kong(COLUMN)cloudy(COLUMN) 8 p.m.(COLUMN) 77 Lisbon(COLUMN)clear(COLUMN)noon(COLUMN) 75 London(COLUMN)clear(COLUMN) 1 p.m.(COLUMN) 72 Madrid(COLUMN)clear(COLUMN) 1 p.m.(COLUMN) 70 Malta(COLUMN)clear(COLUMN) 1 p.m.(COLUMN) 77 Manila(COLUMN)cloudy(COLUMN) 8 p.m.(COLUMN) 84 Moscow(COLUMN)cloudy(COLUMN) 3 p.m.(COLUMN) 54 New Delhi(COLUMN)cloudy(COLUMN) 5 p.m.(COLUMN)100 Nice(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN) 68 Oslo(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN) 68 Paris(COLUMN)clear(COLUMN) 1 p.m.(COLUMN) 72 Peking(COLUMN)rain(COLUMN) 8 p.m.(COLUMN) 68 Rome(COLUMN)clear(COLUMN) 1 p.m.(COLUMN) 73 Saigon(COLUMN)cloudy(COLUMN) 8 p.m.(COLUMN) 82 Sofia(COLUMN)rain(COLUMN) 2 p.m.(COLUMN) 54 Stockholm(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN) 55 Sydney(COLUMN)cloudy(COLUMN)10 p.m.(COLUMN) 54 Tel Aviv(COLUMN)clear(COLUMN) 2 p.m.(COLUMN) 88 Tokyo(COLUMN)cloudy(COLUMN) 9 p.m.(COLUMN) 68 Tunis(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN) 75 Vienna(COLUMN)clear(COLUMN) 1 p.m.(COLUMN) 63 Warsaw(COLUMN)clear(COLUMN) 1 p.m.(COLUMN) 61 Temperatures (Western Hemisphere)(END TABLE)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)fair(COLUMN)88(COLUMN)81 Barbados(COLUMN)fair(COLUMN)86(COLUMN)77 Bermuda(COLUMN)cloudy(COLUMN)78(COLUMN)73 Calgary(COLUMN)rain(COLUMN)59(COLUMN)39 Culiacan(COLUMN)fair(COLUMN)94(COLUMN)66 Edmonton(COLUMN)rain(COLUMN)57(COLUMN)43 Havana(COLUMN)pt. cldy(COLUMN)84(COLUMN)71 Kingston(COLUMN)fair(COLUMN)88(COLUMN)78 Mexico City(COLUMN)fair(COLUMN)79(COLUMN)54 Monterrey(COLUMN)clear(COLUMN)94(COLUMN)72 Montreal(COLUMN)cloudy(COLUMN)72(COLUMN)54 Nassau(COLUMN)pt. cldy(COLUMN)86(COLUMN)69 Ottawa(COLUMN)rain(COLUMN)72(COLUMN)55 Regina(COLUMN)cloudy(COLUMN)61(COLUMN)43 St. Thomas(COLUMN)fair(COLUMN)86(COLUMN)78 Toronto(COLUMN)clear(COLUMN)84(COLUMN)54 Vancouver(COLUMN)cloudy(COLUMN)55(COLUMN)46 Veracruz(COLUMN)pt. cldy(COLUMN)90(COLUMN)77(END TABLE)