Washington: Today - Mostly sunny, highs near 90, lows near 70. Chance of rain near zero through tonight. Monday - Mostly sunny, highs near 90.

Marlyand and Virginia: Today - Mostly sunny, highs near 91, lows in mid 60s to low 70s. Chance of afternoon or evening showers in mountains. Monday - Mostly sunny, highs near 90.

Lower Potomac and Chesapeake day: Today - Fair skies with good visibility through tonight. Winds should be southerly at up t o 15 knots this afternoon decreasing to 5 knots or less tonight.

Extended Area Outlook: For Tuesday through Thursday - Mostly fair and humid with chance of scattered afternoon and evening showers trhough period with highs near 90, lows in mid 60s to low 70s through period. Washington's normal temperature range for this time of year is from 84 to 65.

Atlantic Ocean Beaches from Cape May to Cape Hatteras: Today and Monday - Mostly sunny, highs in 80s. Water temperatures should range from low 70s in north to near 80 in south.

West Virginia: Today - Mostly sunny, highs from upper 70s to near 90, lows in 60s to low 70s. Chance of afternoon and evening showers. Monday - Mostly sunny, highs in upper 70s to near 90.

The National Weather ForeCast for Today - Scattered showers and thunderstorms are likely from the Mississippi Valley eastward with the exception of the middle Atlantic Coast states and over most of Kansas, Oklahoma and west Texas. Mild condtions can be expected over most of the plagues and Rocky Mountain regions and over the northern and central Plains. The remainders of the nation can expect temperatures to be seasonably warm to not.

Almanac data for Sunday, Aug. 28: Sun rises 6:33 a.m., sets 7:45 p.m.; moon rises 7:31 p.m. sets 6:17 a.m. Tides: High 8:20 a.m. and 8:57 p.m., 2:39 a.m. and 3:08 p.m. High and low tides at the following locations can be obtained by substracting 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): Norfola (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 moon to 1 p.m. period was 75 for the pollutant, ozone. Index values between 50 and 99 indicate unhealthy air quality. When the index exceeds 100 the air is considered very unhealthy and individuals with lung, heart and eye ailments are urged to restrict their activity. The forecast for today indicates that the air quality will remain about the same.

The National Weather Service forecasts the Potomac River stage at Little Falls should remain near 2.7 feet today. Local Temp., Humidity(TABLE) Time (COLUMN)T(COLUMN)H 12 mid.(COLUMN)69(COLUMN)81 1 a.m.(COLUMN)68(COLUMN)84 2 a.m.(COLUMN)66(COLUMN)90 3 a.m.(COLUMN)66(COLUMN)90 4 a.m.(COLUMN)65(COLUMN)93 5 a.m.(COLUMN)66(COLUMN)93 6 a.m.(COLUMN)66(COLUMN)93 7 a.m.(COLUMN)66(COLUMN)93 8 a.m.(COLUMN)67(COLUMN)90 9 a.m.(COLUMN)70(COLUMN)84 10 a.m.(COLUMN)75(COLUMN)74 11 a.m.(COLUMN)77(COLUMN)71$12 noon 80(COLUMN)67 1 p.m.(COLUMN)82(COLUMN)65 2 p.m.(COLUMN)84(COLUMN)63 3 p.m.(COLUMN)86(COLUMN)61 4 p.m.(COLUMN)86(COLUMN)61 5 p.m.(COLUMN)85(COLUMN)65(END TABLE) Temperatures ending 8 a.m. (EDT) yesterday(TABLE) City(COLUMN)H(COLUMN)L Albany(COLUMN)76(COLUMN)56 Albuquerque(COLUMN)92(COLUMN)62 Amarillo(COLUMN)91(COLUMN)73 Anchorage(COLUMN)61(COLUMN)55 Asheville(COLUMN)70(COLUMN)68 Atlanta(COLUMN)85(COLUMN)69 Atlantic City(COLUMN)75(COLUMN)67 Austin(COLUMN)98(COLUMN)77 Baltimore(COLUMN)79(COLUMN)61 Billings(COLUMN)66(COLUMN)49 Birmingham(COLUMN)89(COLUMN)72 Bismarck(COLUMN)66(COLUMN)51 Boise(COLUMN)66(COLUMN)48 Boston(COLUMN)77(COLUMN)71 Brownsville(COLUMN)97(COLUMN)77 Buffalo(COLUMN)80(COLUMN)66 Burlington, Yt.(COLUMN)73(COLUMN)60 Casper(COLUMN)64(COLUMN)52 Charleston, S.C.(COLUMN)85(COLUMN)75 Charles'n, W.Va.(COLUMN)87(COLUMN)64 Charlotte, N.C.(COLUMN)83(COLUMN)72 Cheyenne(COLUMN)80(COLUMN)45 Chicago(COLUMN)86(COLUMN)73 Cincinnati(COLUMN)86(COLUMN)73 Cleveland(COLUMN)81(COLUMN)71 Columbia, S.C.(COLUMN)86(COLUMN)72 Columbus, Ohio(COLUMN)85(COLUMN)70 Dal.Ft. Worth(COLUMN)96(COLUMN)77 Dayton(COLUMN)87(COLUMN)73 Denver(COLUMN)93(COLUMN)53 Des Moines(COLUMN)87(COLUMN)77 Detros(COLUMN)82(COLUMN)65 Duhum(COLUMN)66(COLUMN)64 El Paso(COLUMN)94(COLUMN)76 Fairbanks(COLUMN)59(COLUMN)44 Fargo(COLUMN)77(COLUMN)60 Flanstaff(COLUMN)77(COLUMN)45 Great Falls(COLUMN)70(COLUMN)47 Hartford(COLUMN)80(COLUMN)56 Helena(COLUMN)64(COLUMN)47 Honolulu(COLUMN)88(COLUMN)78 Houston(COLUMN)92(COLUMN)76 Indianapolis(COLUMN)88(COLUMN)74 Jacksonz, Miss.(COLUMN)91(COLUMN)75 Jacksonville(COLUMN)91(COLUMN)73 Juneau(COLUMN)59(COLUMN)53 Kansas City(COLUMN)92(COLUMN)76 Las Vegas(COLUMN)96(COLUMN)74 Little Rock(COLUMN)93(COLUMN)73 Los Angeles(COLUMN)80(COLUMN)68 Louiseville(COLUMN)90(COLUMN)75 Memphis(COLUMN)94(COLUMN)77 Miami Beach(COLUMN)84(COLUMN)75 Midlands(COLUMN)100(COLUMN)75 Milwaukee(COLUMN)79(COLUMN)72 Mpts. St. Paul(COLUMN)89(COLUMN)71 Nashville(COLUMN)90(COLUMN)74 New Orleans(COLUMN)90(COLUMN)77 New York(COLUMN)79(COLUMN)66 Norfolk(COLUMN)81(COLUMN)65 North Platte(COLUMN)92(COLUMN)63 Oklahoma City(COLUMN)96(COLUMN)76 Omaha(COLUMN)93(COLUMN)76 Orlando(COLUMN)91(COLUMN)75 Philadelphia(COLUMN)79(COLUMN)62 Phoenix(COLUMN)105(COLUMN)82 Pittsburgh(COLUMN)82(COLUMN)67 Portland, Me.(COLUMN)70(COLUMN)48 Portland, Ore.(COLUMN)73(COLUMN)56 Providence(COLUMN)76(COLUMN)56 Raleigh(COLUMN)84(COLUMN)65 Rapid City(COLUMN)78(COLUMN)56 Reno(COLUMN)78(COLUMN)39 Richmond(COLUMN)81(COLUMN)62 St. Louis(COLUMN)92(COLUMN)76 St. Prbg.-Tampa(COLUMN)93(COLUMN)77 San Anfonio(COLUMN)94(COLUMN)77 San Deigo(COLUMN)76(COLUMN)69 San Francisco(COLUMN)68(COLUMN)58 San Juan, P.R.(COLUMN)88(COLUMN)76 St. Ste. Marie(COLUMN)66(COLUMN)61 Salt Lake City(COLUMN)70(COLUMN)52 Seattle(COLUMN)68(COLUMN)57 Shreveport(COLUMN)94(COLUMN)72 Sioux Falls(COLUMN)87(COLUMN)69 Spokane(COLUMN)63(COLUMN)48 Syracuse(COLUMN)77(COLUMN)58 Topeka(COLUMN)94(COLUMN)79 Tucson(COLUMN)100(COLUMN)77 Tulsa(COLUMN)96(COLUMN)78 Washington(COLUMN)79(COLUMN)65 Wichita(COLUMN)95(COLUMN)76(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)T. Aberdeen(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)55 Amsterdam(COLUMN)pt.cldy(COLUMN)1 p.m.(COLUMN)68 Ankara(COLUMN)pt. cldy(COLUMN)3 p.m.(COLUMN)70 Athens(COLUMN)clear(COLUMN)2 p.m.(COLUMN)82 Auckland(COLUMN)pt. cldy(COLUMN)midnight(COLUMN)52 Berlin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)68 Birmingham(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)57 Brussels(COLUMN)storm(COLUMN)1 p.m.(COLUMN)66 Cairo(COLUMN)clear(COLUMN)2 p.m.(COLUMN)90 Casablanca(COLUMN)pt. cldy(COLUMN)noon(COLUMN)72 Copenhagen(COLUMN)rain(COLUMN)1 p.m.(COLUMN)59 Dublin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)54 Geneva(COLUMN)rain(COLUMN)1 p.m.(COLUMN)61 Hong Kong(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)84 Lisbon(COLUMN)pt. cldy(COLUMN)noon(COLUMN)70 London(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)64 Malta(COLUMN)clear(COLUMN)1 p.m.(COLUMN)81 Manila(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)82Moscow pt. cldy(COLUMN)3 p.m.(COLUMN)66 New Delhi(COLUMN)pt. cldy(COLUMN)5 p.m.(COLUMN)93 Nice(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)72 Oslo(COLUMN)storm(COLUMN)1 p.m.(COLUMN)63 Paris(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)71 Peking(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)77 Rome(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)81 Saigon(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)81 Sofia(COLUMN)clear(COLUMN)2 p.m.(COLUMN)73 Stockholm(COLUMN)rain(COLUMN)1 p.m.(COLUMN)63 Sydney(COLUMN)cloudy(COLUMN)10 p.m.(COLUMN)59 Tel Aviv(COLUMN)clear(COLUMN)2 p.m.(COLUMN)88 Tokyo(COLUMN)cloudy(COLUMN)9 p.m.(COLUMN)77 Tunis(COLUMN)clear(COLUMN)1 p.m.(COLUMN)97 Vienna(COLUMN)haze(COLUMN)1 p.m.(COLUMN)73 Warsaw(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)70(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)pt.cldy(COLUMN)97(COLUMN)77 Barbaoos(COLUMN)cloudy(COLUMN)86(COLUMN)77 Bormuda(COLUMN)fair(COLUMN)87(COLUMN)79 Calgary(COLUMN)pt. cldy(COLUMN)64(COLUMN)41 Culiacan(COLUMN)pt. cldy(COLUMN)95(COLUMN)75 Edmonton(COLUMN)clear(COLUMN)61(COLUMN)32 Havana(COLUMN)cloudy(COLUMN)88(COLUMN)73 Kingston(COLUMN)clear(COLUMN)88(COLUMN)79 Montego Bay(COLUMN)fair(COLUMN)90(COLUMN)77 Mexico City(COLUMN)pt. cldy(COLUMN)77(COLUMN)54 Monterrey(COLUMN)cloudy(COLUMN)100(COLUMN)75 Montreal(COLUMN)clear(COLUMN)72(COLUMN)59 Nassau(COLUMN)cloudy(COLUMN)88(COLUMN)73 Ottawa(COLUMN)pt.cldy(COLUMN)73(COLUMN)59 Regina(COLUMN)cloudy(COLUMN)72(COLUMN)45 St. Kitts(COLUMN)fair(COLUMN)90(COLUMN)78 St. Thomas(COLUMN)fair(COLUMN)88(COLUMN)79 Toronto(COLUMN)cloudy(COLUMN)73(COLUMN)55 Vancouver(COLUMN)cloudy(COLUMN)68(COLUMN)54 Veracruz(COLUMN)pt. cldy(COLUMN)90(COLUMN)75 Winnipeg(COLUMN)cloudy(COLUMN)72(COLUMN)46(END TABLE)