Washington: Today - Sunny and hot, high in the mid 90s, low in the 60s. The chance of rain is 20 percent today and near zero tonight. Winds will be from the northwest at 12 mph. Thursday - Sunny and warm, high near 90.

Maryland and Virginia: Today - Sunny and hot, highs from the mid 80s to the low 90s, lows from the mid 60s to mid 70s. Thursday - Sunny and warm, high near 90.

Extended Area Forecast for Friday through Sunday - Fair and warm through the period. Highs will average from the upper 80s to mid 90s, lows from the mid 60s to mid 70s. Normal Washington temperatures for the period are a high of 87 and a low of 58.

Lower Potomac and Chesapeake Bay - Fair. Visibility will be 5 miles or more. Winds will be from the northwest at 8 to 12 knots. Waves will average 1 to 2 feet.

Atlantic Ocean Beaches from New Jersey to North Carolina: Today - Hot and humid, with a chance of thunderstorms, high near 90. Thursday - Sunny and less humid, high in the 80s. Water temperatures will range from the low to mid 60s in the north to low 70s in the south.

The National Weather Forecast for today - Showers and thunderstorms will be scattered across Florida, the upper Mississippi Valley and Northern Maine. Temperatures will be warm to hot over the nation except for the central Intermountain Region of the west where cool to mild readings will prevail. A few very hot readings will be scattered across the south Atlantic States, the lower Ohio Valley and the upper Mississippi Valley. Hazy conditions are expected in North Caroina with cloudiness in the central Intermountain Region. The rest of the nation will have mostly sunny skies.

Almanac Data for today: The sun rises 5:45 a.m., sets 6:37 p.m.; moon rises 1:27 a.m. sets 2:28 p.m. Tides: high 10:02 a.m. and 10:19 p.m., low 3:17 a.m. and 3:36 p.m. High and low tides at the following locations may be obtained by subtracting the hours indicated from the hours above: Annapolis (3 1/4), Bloody Point Lighthouse (4 1/2), Deale, Md. (4 1/2), Colonial Beach (5 1/4), Norfolk (1), Virginia Beach (3/4), Solomons Island (6 1/4), Point Lookout (7).

Pollen Count: 7 English Plaintain; 4, a reading of more than 7 is considered to be undesirable)."

The Council of Governments' Air Quality Index for yesterday showed the high reading in the Washington area during the 3 p.m. period was 110 for the pollutant, photo-chemical oxidants. Index values between 100 and 249 indicate very 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 3.4 feet today. Local Temps., Humidity(TABLE) Time(COLUMN)T(COLUMN)H 12 m'night(COLUMN)79(COLUMN)80 1 a.m.(COLUMN)78(COLUMN)88 2 a.m.(COLUMN)72(COLUMN)87 3 a.m.(COLUMN)72(COLUMN)87 4 a.m.(COLUMN)75(COLUMN)87 5 a.m.(COLUMN)74(COLUMN)90 6 a.m.(COLUMN)73(COLUMN)90 7 a.m.(COLUMN)74(COLUMN)91 8 a.m.(COLUMN)76(COLUMN)85 9 a.m.(COLUMN)80(COLUMN)77 10 a.m.(COLUMN)83(COLUMN)72 11 a.m.(COLUMN)85(COLUMN)48 12 noon(COLUMN)87(COLUMN)66 1 p.m.(COLUMN)89(COLUMN)64 2 p.m.(COLUMN)94(COLUMN)51 3 p.m.(COLUMN)94(COLUMN)57 4 p.m.(COLUMN)96(COLUMN)53 5 p.m.(COLUMN)96(COLUMN)55 6 p.m.(COLUMN)93(COLUMN)64 7 p.m.(COLUMN)92(COLUMN)64(END TABLE) Temperatures ending 8 a.m. (EDT) yesterday:(TABLE) City(COLUMN)H(COLUMN)L Albany(COLUMN)78(COLUMN)60 Albuquerque(COLUMN)96(COLUMN)69 Amarillo(COLUMN)99(COLUMN)75 Anchorage(COLUMN)60(COLUMN)52 Asheville(COLUMN)90(COLUMN)66 Atlanta(COLUMN)94(COLUMN)67 Atlantic City(COLUMN)81(COLUMN)69 Austin(COLUMN)97(COLUMN)74 Baltimore(COLUMN)86(COLUMN)71 Billings(COLUMN)72(COLUMN)54 Birmingham(COLUMN)94(COLUMN)70 Bismarck(COLUMN)72(COLUMN)50 Boise(COLUMN)77(COLUMN)50 Boston(COLUMN)83(COLUMN)62 Brownsville(COLUMN)96(COLUMN)80 Buffalo(COLUMN)84(COLUMN)68 Burlington, Vt.(COLUMN)79(COLUMN)64 Casper(COLUMN)77(COLUMN)46 Charleston, S.C.(COLUMN)90(COLUMN)78 Charleston, W. Va.(COLUMN)91(COLUMN)78 Charlotte, N.C.(COLUMN)90(COLUMN)74 Cheyenne(COLUMN)76(COLUMN)52 Chicago(COLUMN)88(COLUMN)72 Cincinnati(COLUMN)90(COLUMN)76 Cleveland(COLUMN)83(COLUMN)68 Columbia, S.C.(COLUMN)90(COLUMN)75 Columbus(COLUMN)89(COLUMN)74 Dal.-Ft. Worth(COLUMN)99(COLUMN)75 Dayton(COLUMN)90(COLUMN)77 Denver(COLUMN)85(COLUMN)60 Des Moines(COLUMN)89(COLUMN)71 Detroit(COLUMN)83(COLUMN)65 Duluth(COLUMN)80(COLUMN)60 El Paso(COLUMN)102(COLUMN)79 Fairbanks(COLUMN)60(COLUMN)43 Fargo(COLUMN)75(COLUMN)54 Flagstaff(COLUMN)78(COLUMN)39 Great Falls(COLUMN)73(COLUMN)51 Hartford(COLUMN)83(COLUMN)63 Helena(COLUMN)77(COLUMN)45 Honolulu(COLUMN)86(COLUMN)75 Houston(COLUMN)92(COLUMN)78 Indianapolis(COLUMN)94(COLUMN)78 Jackson(COLUMN)95(COLUMN)74 Jacksonville(COLUMN)90(COLUMN)70 Juneau(COLUMN)53(COLUMN)48 Kansas City(COLUMN)91(COLUMN)92 Las Vegas(COLUMN)98(COLUMN)70 Little Rock(COLUMN)96(COLUMN)77 Los Angeles(COLUMN)76(COLUMN)60 Louisville(COLUMN)96(COLUMN)76 Memphis(COLUMN)95(COLUMN)81 Miami Beach(COLUMN)86(COLUMN)77 Midland(COLUMN)99(COLUMN)71 Milwaukee(COLUMN)89(COLUMN)75 Mpls.-St. Paul(COLUMN)84(COLUMN)62 Nashville(COLUMN)96(COLUMN)73 New Orleans(COLUMN)94(COLUMN)73 New York(COLUMN)75(COLUMN)66 Norfolk, Va.(COLUMN)85(COLUMN)71 North Platte(COLUMN)86(COLUMN)59 Oklahoma City(COLUMN)94(COLUMN)75 Omaha(COLUMN)85(COLUMN)67 Orlando(COLUMN)92(COLUMN)74 Philadelphia(COLUMN)80(COLUMN)72 Phoenix(COLUMN)108(COLUMN)79 Pittsburgh(COLUMN)81(COLUMN)67 Portland, Me.(COLUMN)77(COLUMN)60 Portland, Ore.(COLUMN)77(COLUMN)57 Providence(COLUMN)80(COLUMN)67 Raleigh(COLUMN)86(COLUMN)72 Rapid City(COLUMN)78(COLUMN)51 Reno(COLUMN)75(COLUMN)52 Richmond(COLUMN)91(COLUMN)70 St. Louis(COLUMN)95(COLUMN)77 St. Prbg.-Tampa(COLUMN)93(COLUMN)77 Salt Lake City(COLUMN)83(COLUMN)56 San Antonio(COLUMN)96(COLUMN)76 San Diego(COLUMN)70(COLUMN)64 San Francisco(COLUMN)65(COLUMN)55 San Juan(COLUMN)87(COLUMN)74 St. Ste. Marie(COLUMN)74(COLUMN)59 Seattle(COLUMN)76(COLUMN)57 Shreveport(COLUMN)100(COLUMN)73 Sioux Falls(COLUMN)78(COLUMN)57 Spokane(COLUMN)76(COLUMN)52 Syracuse(COLUMN)80(COLUMN)69 Topeka(COLUMN)91(COLUMN)72 Tucson(COLUMN)103(COLUMN)80 Tulsa(COLUMN)94(COLUMN)76 Washington(COLUMN)88(COLUMN)73 Wichita(COLUMN)97(COLUMN)74(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Remp Aberdeen(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)61 Amsterdam(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)54 Ankara(COLUMN)clear(COLUMN)3 p.m.(COLUMN)82 Athens(COLUMN)clear(COLUMN)2 p.m.(COLUMN)86 Auckland(COLUMN)clear(COLUMN)midnight(COLUMN)50 Berlin(COLUMN)rain(COLUMN)1 p.m.(COLUMN)55 Birmingham(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)54 Bonn(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)55 Brussels(COLUMN)rain(COLUMN)1 p.m.(COLUMN)55 Cairo(COLUMN)clear(COLUMN)2 p.m.(COLUMN)95 Casablanca(COLUMN)cloudy(COLUMN)noon(COLUMN)70 Copenhagen(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)63 Dublin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)57 Geneva(COLUMN)rain(COLUMN)1 p.m.(COLUMN)52 Hong Kong(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)82 Jerusalem(COLUMN)clear(COLUMN)2 p.m.(COLUMN)86 Lisbon(COLUMN)clear(COLUMN)noon(COLUMN)77 London(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)57 Madrid(COLUMN)clear(COLUMN)1 p.m.(COLUMN)70 Malta(COLUMN)clear(COLUMN)1 p.m.(COLUMN)75 Manila(COLUMN)pt. cldy.(COLUMN)8 p.m.(COLUMN)79 Moscow(COLUMN)pt. cldy.(COLUMN)3 p.m.(COLUMN)81 New Delhi(COLUMN)cloudy(COLUMN)5 p.m.(COLUMN)90 Nice(COLUMN)clear(COLUMN)1 p.m.(COLUMN)66 Oslo(COLUMN)clear(COLUMN)1 p.m.(COLUMN)70 Paris(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)61 Peking(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)86 Rome(COLUMN)rain(COLUMN)1 p.m.(COLUMN)64 Saigon(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)79 Sofia(COLUMN)cloudy(COLUMN)2 p.m.(COLUMN)66 Stockholm(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)64 Sydney(COLUMN)cloudy(COLUMN)10 p.m.(COLUMN)57 Tokyo(COLUMN)cloudy(COLUMN)9 p.m.(COLUMN)72 Tunis(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)77 Vienna(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)66 Warsaw(COLUMN)cloudy(COLUMN)10 p.m.(COLUMN)61(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)cloudy(COLUMN)90(COLUMN)80 Barbados(COLUMN)pt. cldy(COLUMN)83(COLUMN)77 Bermuda(COLUMN)pt. cldy.(COLUMN)50(COLUMN)75 Calgary(COLUMN)pt. cldy.(COLUMN)73(COLUMN)53 Culiacan(COLUMN)pt. cldy.(COLUMN)95(COLUMN)80 Edmonton(COLUMN)clear(COLUMN)75(COLUMN)48 Havana(COLUMN)pt. cldy.(COLUMN)88(COLUMN)77 Kingston(COLUMN)fair(COLUMN)90(COLUMN)79 Mexico City(COLUMN)cloudy(COLUMN)81(COLUMN)59 Monterrey(COLUMN)cloudy(COLUMN)101(COLUMN)77 Montreal(COLUMN)cloudy(COLUMN)79(COLUMN)64 Nassau(COLUMN)pt. cldy.(COLUMN)91(COLUMN)75 Regina(COLUMN)pt. cldy.(COLUMN)79(COLUMN)52 St. Kitts(COLUMN)pt. cldy.(COLUMN)88(COLUMN)75 Toronto(COLUMN)clear(COLUMN)86(COLUMN)68 Vancouver(COLUMN)clear(COLUMN)70(COLUMN)55 Veracruz(COLUMN)pt. cldy.(COLUMN)88(COLUMN)75 Winnipeg(COLUMN)clear(COLUMN)73(COLUMN)54(END TABLE)