Washington: Today - Mostly sunny, high 88 to 92, low in low 70s. Chance of rain is 10 percent through tonight. Winds will be southwesterly at 10 mph. Monday - Partly, cloudy with a chance of thunderstorms high near 95.

Maryland and Virginia: Today - Sunny and warm, high in low 90s, low in low 70s. Monday - Partly cloudy with a chance of thunderstorms, high in mid 90s.

Lower Potomac and Chesapeake Bay: Today - Fair, visibility more than five miles. Winds will be southwesterly at 10 to 15 knots. Waves in unprotected waters will be 2 feet.

Extended Area Outlook for Tuesday through Thursday. Partly cloudy warm and humid with a chance of afternoon or evening thunderstorms each day. Highs will average in the 80s and lows in the 60s. Normal Washington temperatures for the period will be a high 88 and low of 69.

Atlantic Ocean Beaches from New Jersey to North Carolina: Today - Vastly sunny and warm high in the 80s. There will be a chance of thunderstorms in southern portion. Monday - Partly cloudy and hot with a chance of afternoon or evening thunderstorms, high near 90. Water temperatures will be in the upper 60s in the north to the mid 70s in the south.

The National Weather Forecast for today - Showers and thunderstorms will be scattered from the upper Mississippi Valley across Iowa and the eastern portions of Nebraska and South Dakota and be widely scattered or isolated from Oregon across the Rockies and the central Great Plains. Except for Texas, after noon thundershowers will also be widely scattered through the Gulf and the Atlantic Coast states north over New Jersey and become more numerous in New England. Elsewhere sunny skies will prevail. Mild temperatures will continue from the northern halves of the Rockies and the inter-mountain region to the Pacific Coast and it will become mild from Nebraska over the Dakotas and the upper Mississippi Valley. New England will not be as warm while the rest of the nation will be seasonably warm.

Almanac Data for Today: The sun rises 5:51 a.m., sets 8:35 p.m. moon rises 8:47, sets 10:58. Tides: High, 11:17 and 11:43 low 10:58 and 6:22. High and low tides at the following locations may be obtained from the hours above: Annapolis (4 1/2), Deale, Md. (4 1/8), Colonial Beach (5 1/4), Norfolk (1), Virginia Beach (3/4), 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 12 to 1 p.m. period was 50 for the pollutant, photo-chemical oxidants. Index values between 50 and 100 indicate unhealthy air quality and individuals with lung, heart and eye ailments are urged to restrict their activity. The forecast for today indicates that the air quality will deteriorate.

The National Weather Service forecast the Potomac River stage at Little Falls should fall to 4 feet today. Local Temps. Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 midnite(COLUMN)73(COLUMN)64 1 a.m.(COLUMN)72(COLUMN)69 2 a.m.(COLUMN)72(COLUMN)69 3 a.m.(COLUMN)71(COLUMN)64 4 a.m.(COLUMN)70(COLUMN)68 5 a.m.(COLUMN)70(COLUMN)71 6 a.m.(COLUMN)70(COLUMN)73 7 a.m.(COLUMN)71(COLUMN)71 8 a.m.(COLUMN)73(COLUMN)69 9 a.m.(COLUMN)76(COLUMN)64 10 a.m.(COLUMN)78(COLUMN)65 11 a.m.(COLUMN)81(COLUMN)60 12 noon(COLUMN)83(COLUMN)57 1 p.m.(COLUMN)87(COLUMN)55 2 p.m.(COLUMN)88(COLUMN)56 3 p.m.(COLUMN)89(COLUMN)56 4 p.m.(COLUMN)89(COLUMN)58 5 p.m.(COLUMN)90(COLUMN)56 6 p.m.(COLUMN)87(COLUMN)61(END TABLE) Temperatures ending 8 a.m. (EDT) yesterday:(TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)87(COLUMN)66 Albuquerque(COLUMN)99(COLUMN)72 Amarillo(COLUMN)95(COLUMN)68 Anchorage(COLUMN)70(COLUMN)57 Asheville(COLUMN)82(COLUMN)62 Atlanta(COLUMN)87(COLUMN)66 Atlantic City(COLUMN)74(COLUMN)64 Austin(COLUMN)98(COLUMN)73 Baltimore(COLUMN)86(COLUMN)63 Billings(COLUMN)80(COLUMN)59 Birmingham(COLUMN)91(COLUMN)72 Bismarck(COLUMN)75(COLUMN)55 Boise(COLUMN)84(COLUMN)52 Boston(COLUMN)88(COLUMN)66 Brownsville(COLUMN)95(COLUMN)79 Buffalo(COLUMN)89(COLUMN)74 Burlington(COLUMN)91(COLUMN)68 Casper(COLUMN)83(COLUMN)54 Charleston, S.C.(COLUMN)86(COLUMN)75 Charleston W.Va.(COLUMN)83(COLUMN)68 Charlotte(COLUMN)84(COLUMN)64 Cheyenne(COLUMN)82(COLUMN)59 Chicago(COLUMN)87(COLUMN)67 Cincinnati(COLUMN)87(COLUMN)67 Cleveland(COLUMN)92(COLUMN)73 Columbia, S.C.(COLUMN)87(COLUMN)63 Columbus(COLUMN)90(COLUMN)70 Dal.-Ft. Worth(COLUMN)100(COLUMN)77 Dayton(COLUMN)91(COLUMN)69 Denver(COLUMN)90(COLUMN)66 Des Moines(COLUMN)83(COLUMN)61 Detroit(COLUMN)91(COLUMN)66 Duluth(COLUMN)71(COLUMN)50 El Paso(COLUMN)103(COLUMN)74 Fairbanks(COLUMN)71(COLUMN)53 Fargo(COLUMN)71(COLUMN)53 Flagstaff(COLUMN)86(COLUMN)51 Great Falls(COLUMN)82(COLUMN)52 Hartford(COLUMN)88(COLUMN)63 Helena(COLUMN)79(COLUMN)55 Honolulu(COLUMN)86(COLUMN)74 Houston(COLUMN)95(COLUMN)79 Indianapolis(COLUMN)93(COLUMN)72 Jackson, Miss.(COLUMN)55(COLUMN)73 Jacksonville(COLUMN)88(COLUMN)70 Juneau(COLUMN)66(COLUMN)52 Kansas City(COLUMN)90(COLUMN)66 Las Vegas(COLUMN)107(COLUMN)76 Little Rock(COLUMN)98(COLUMN)73 Los Angeles(COLUMN)82(COLUMN)62 Louisville(COLUMN)92(COLUMN)72 Memphis(COLUMN)96(COLUMN)74 Miami Beach(COLUMN)87(COLUMN)77 Midland-Odessa(COLUMN)97(COLUMN)70 Milwaukee(COLUMN)85(COLUMN)64 Mpls.-St. Paul(COLUMN)76(COLUMN)54 Nashville(COLUMN)93(COLUMN)74 New Orleans(COLUMN)90(COLUMN)74 New York(COLUMN)86(COLUMN)68 Norfolk(COLUMN)80(COLUMN)63 North Platte(COLUMN)85(COLUMN)60 Oklahoma City(COLUMN)99(COLUMN)74 Omaha(COLUMN)81(COLUMN)62 Orlando(COLUMN)88(COLUMN)73 Philadelphia(COLUMN)86(COLUMN)64 Phoenix(COLUMN)109(COLUMN)88 Pittsburgh(COLUMN)88(COLUMN)71 Portland, Me.(COLUMN)92(COLUMN)62 Portland, Ore.(COLUMN)80(COLUMN)57 Providence(COLUMN)89(COLUMN)65 Raleigh(COLUMN)89(COLUMN)62 Rapid City(COLUMN)79(COLUMN)60 Reno(COLUMN)84(COLUMN)49 Richmond(COLUMN)87(COLUMN)64 St. Louis(COLUMN)95(COLUMN)75 St. Prbg.-Tampa(COLUMN)89(COLUMN)73 Salt Lake City(COLUMN)94(COLUMN)59 San Antonio(COLUMN)98(COLUMN)74 San Diego(COLUMN)74(COLUMN)64 San Francisco(COLUMN)63(COLUMN)52 San Juan(COLUMN)88(COLUMN)76 St. Ste. Marie(COLUMN)79(COLUMN)55 Seattle(COLUMN)75(COLUMN)57 Shreveport(COLUMN)100(COLUMN)76 Sioux Falls(COLUMN)77(COLUMN)56 Spokane(COLUMN)83(COLUMN)59 Syracuse(COLUMN)92(COLUMN)72 Topeka(COLUMN)83(COLUMN)59 Tucson(COLUMN)105(COLUMN)82 Tulsa(COLUMN)97(COLUMN)75 Washington(COLUMN)86(COLUMN)70 Wichita(COLUMN)93(COLUMN)73(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN) 59 Ansterdan(COLUMN)rain(COLUMN) 1 p.m.(COLUMN) 57 Ankara(COLUMN)clear(COLUMN) 3 p.m.(COLUMN) 95 Athens(COLUMN)clear(COLUMN) 2 p.m.(COLUMN) 86 Auckland(COLUMN)rain(COLUMN)12 p.m.(COLUMN) 45 Berlin(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN) 61 Birmingham(COLUMN)pt cldy(COLUMN) 1 p.m.(COLUMN) 63 Bonn(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN) 61 Brussels(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN) 64 Cairo(COLUMN)clear(COLUMN) 2 p.m.(COLUMN)100 Casablanca(COLUMN)clear(COLUMN)12 p.m.(COLUMN) 77 Copenhagen(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN) 59 Dublin(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN) 63 Geneva(COLUMN)pt cldy(COLUMN) 1 p.m.(COLUMN) 59 Hong Kong(COLUMN)clear(COLUMN) 8 p.m.(COLUMN) 84 Jerusalem(COLUMN)clear(COLUMN) 2 p.m.(COLUMN) 97 Lisbon(COLUMN)clear(COLUMN)12 p.m.(COLUMN) 90 London(COLUMN)rain(COLUMN) 1 p.m.(COLUMN) 59 Madrid(COLUMN)clear(COLUMN) 1 p.m.(COLUMN) 84 Manila(COLUMN)rain(COLUMN) 8 p.m.(COLUMN) 77 Moscow(COLUMN)cloudy(COLUMN) 3 p.m.(COLUMN) 68 New Delhi(COLUMN)pt cldy(COLUMN) 5 p.m.(COLUMN) 95 Nice(COLUMN)clear(COLUMN) 1 p.m.(COLUMN) 70 Oslo(COLUMN)rain(COLUMN) 1 p.m.(COLUMN) 54 Paris(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN) 61 Peking(COLUMN)cloudy(COLUMN) 8 p.m.(COLUMN) 84 Rome(COLUMN)clear(COLUMN) 1 p.m.(COLUMN) 73 Saigon(COLUMN)storm(COLUMN) 8 p.m.(COLUMN) 82 Sofia(COLUMN)pt cldy(COLUMN) 2 p.m.(COLUMN) 70 Stockholm(COLUMN)pt cldy(COLUMN) 1 p.m.(COLUMN) 64 Sydney(COLUMN)cloudy(COLUMN)10 p.m.(COLUMN) 52 Tokyo(COLUMN)rain(COLUMN) 2 p.m.(COLUMN) 79 Tunis(COLUMN)clear(COLUMN) 1 p.m.(COLUMN) 77 Vienna(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN) 64 Warsaw(COLUMN)pt cldy(COLUMN) 1 p.m.(COLUMN) 61(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)fair(COLUMN) 90(COLUMN)77 Barbados(COLUMN)fair(COLUMN) 86(COLUMN)80 Bermuda(COLUMN)pt cldy(COLUMN) 82(COLUMN)78 Calgary(COLUMN)rain(COLUMN) 64(COLUMN)46 Edmonton(COLUMN)pt cldy(COLUMN) 57(COLUMN)46 Kingston(COLUMN)pt cldy(COLUMN) 92(COLUMN)80 Montego Bay(COLUMN)pt cldu(COLUMN) 88(COLUMN)78 Mexico City(COLUMN)haze(COLUMN) 77(COLUMN)54 Monterrey(COLUMN)fair(COLUMN)101(COLUMN)73 Nassau(COLUMN)pt cldy(COLUMN) 88(COLUMN)77 Ottawa(COLUMN)clear(COLUMN) 90(COLUMN)70 Regina(COLUMN)cloudy(COLUMN) 68(COLUMN)48 St. Kitts(COLUMN)pt cldy(COLUMN) 83(COLUMN)76 St. Thomas(COLUMN)pt cldy(COLUMN) 90(COLUMN)77 Toronto(COLUMN)haze(COLUMN) 90(COLUMN)72 Vancouver(COLUMN)clear(COLUMN) 73(COLUMN)45 Veracruz(COLUMN)cloudy(COLUMN) 90(COLUMN)73 Winnipeg(COLUMN)cloudy(COLUMN) 68(COLUMN)57(END TABLE)