Washington: Today - Sunny, high in mid 60s, low in 60s. Chance of rain is zero today and 10 percent tonight. Winds will be light and variable. Saturday - Partly sunny, with a chance of afternoon thundershowers, high in upper 80s.

Maryland and Virginia: Today - Mostly sunny, high near 80, low in low 60s. Saturday - Cloudy, with a chance of thunderstorms mostly in the mountains, high in 80s.

Lower Potomac and Chesapeake Bay: Today - Fair, visibility more than five miles. Winds will be from the north at 75 knots. Waves in unprotected waters will be 2 feet.

Atlantic Ocean Beaches from New Jersey to North Carolina: Today - Sunny and pleasant, highs near 80. Saturday - Partly cloudy, highs near 80. Water temperatures will be in mid 60s in the north and 60s in low 70s in south.

Extended Area Outlook for Sunday through Tuesday: Warm and humid Sunday and Monday, with a chance of thunderstorms on Tuesday. Highs will be in the 80s and 90s, low in the 60s. Normal Washington temperatures for the period are a high of 87 and a low of 67.

The National Weather Forecast for today - showers and thunderstorms will be widely scattered from the northern Plains through the central Midwest and the southeastern states. The more widespread activity will be found over Florida. A few showers and thunderstorms will linger over northern New England, and will also be scattered from Montana through the Pacific Northwest. It will be mostly sunny in other sections of the country. Temperatures will be mild over the Pacific Northwest, the northern intermountain region and the northeastern states. Warm readings will prevail elsewhere, with continued hot weather in the Southwest.

Almanac Data for today: The sun rises 5:43 a.m., sets 8:37 p.m.; moon rises 11 p.m., sets 9 a.m. Tides: high 10:49 a.m. and 11:24 p.m., low 5:08 a.m. and 5:45 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: 9 grass (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 2 to 3 p.m. period was 95 for the pollutant, photochemical oxidants. 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 improve.

The National Weather Service forecasts the Potomac River Stage at Little Falls should rise to 3.6 feet today. Local Temps., Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 midnight(COLUMN)70(COLUMN)90 1 a.m.(COLUMN)70(COLUMN)90 2 a.m.(COLUMN)70(COLUMN)90 3 a.m.(COLUMN)70(COLUMN)90 4 a.m.(COLUMN)70(COLUMN)90 5 a.m.(COLUMN)69(COLUMN)93 6 a.m.(COLUMN)70(COLUMN)90 7 a.m.(COLUMN)70(COLUMN)90 8 a.m.(COLUMN)71(COLUMN)90 9 a.m.(COLUMN)73(COLUMN)82 10 a.m.(COLUMN)77(COLUMN)74 11 a.m.(COLUMN)79(COLUMN)72 12 noon(COLUMN)80(COLUMN)69 1 a.m.(COLUMN)85(COLUMN)55 2 a.m.(COLUMN)86(COLUMN)48 3 p.m.(COLUMN)86(COLUMN)47 4 p.m.(COLUMN)86(COLUMN)47 5 p.m.(COLUMN)86(COLUMN)45 6 p.m.(COLUMN)85(COLUMN)45 7 p.m.(COLUMN)84(COLUMN)45(END TABLE) Temperatures ending 8 a.m. (EDT) yesterday:(TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)84(COLUMN)63 Albuquerque(COLUMN)98(COLUMN)59 Amarillo(COLUMN)94(COLUMN)70 Anchorage(COLUMN)63(COLUMN)54 Asheville(COLUMN)80(COLUMN)56 Atlanta(COLUMN)87(COLUMN)67 Atlantic City(COLUMN)68(COLUMN)62 Austin(COLUMN)93(COLUMN)70 Baltimore(COLUMN)88(COLUMN)66 Billings(COLUMN)84(COLUMN)53 Birmingham(COLUMN)89(COLUMN)68 Bismarck(COLUMN)76(COLUMN)50 Boise(COLUMN)84(COLUMN)49 Boston(COLUMN)63(COLUMN)57 Brownsville(COLUMN)94(COLUMN)72 Buffalo(COLUMN)71(COLUMN)54 Burlington(COLUMN)83(COLUMN)63 Casper(COLUMN)87(COLUMN)55 Charleston, S.C.(COLUMN)83(COLUMN)76 Charleston, W.Va.(COLUMN)82(COLUMN)63 Charlotte(COLUMN)88(COLUMN)65 Cheyenne(COLUMN)83(COLUMN)53 Chicago(COLUMN)74(COLUMN)55 Cincinnati(COLUMN)79(COLUMN)55 Cleveland(COLUMN)80(COLUMN)50 Columbia, S.C.(COLUMN)89(COLUMN)69 Columbus(COLUMN)80(COLUMN)51 Dal.-Ft. Worth(COLUMN)96(COLUMN)74 Dayton(COLUMN)82(COLUMN)51 Denver(COLUMN)92(COLUMN)59 Des Moines(COLUMN)78(COLUMN)63 Detroit(COLUMN)75(COLUMN)47 Duluth(COLUMN)72(COLUMN)46 El Paso(COLUMN)105(COLUMN)68 Fairbanks(COLUMN)67(COLUMN)51 Fargo(COLUMN)76(COLUMN)60 Flagstaff(COLUMN)87(COLUMN)47 Great Falls(COLUMN)84(COLUMN)58 Hartford(COLUMN)88(COLUMN)69 Helena(COLUMN)83(COLUMN)51 Honolulu(COLUMN)87(COLUMN)74 Houston(COLUMN)89(COLUMN)77 Indianapolis(COLUMN)79(COLUMN)55 Jackson, Miss.(COLUMN)93(COLUMN)70 Jacksonville(COLUMN)87(COLUMN)70 Juneau(COLUMN)71(COLUMN)42 Kansas City(COLUMN)97(COLUMN)63 Las Vegas(COLUMN)107(COLUMN)79 Little Rock(COLUMN)85(COLUMN)72 Los Angeles(COLUMN)89(COLUMN)63 Louisville(COLUMN)83(COLUMN)60 Memphis(COLUMN)87(COLUMN)73 Miami Beach(COLUMN)85(COLUMN)75 Midland-Odessa(COLUMN)96(COLUMN)72 Milwaukee(COLUMN)71(COLUMN)53 Mpls.-St. Paul(COLUMN)76(COLUMN)59 Nashville(COLUMN)88(COLUMN)76 New Orleans(COLUMN)91(COLUMN)72 New York(COLUMN)83(COLUMN)70 Norfolk(COLUMN)89(COLUMN)66 North Platte(COLUMN)81(COLUMN)65 Oklahoma City(COLUMN)85(COLUMN)67 Omaha(COLUMN)79(COLUMN)62 Orlando(COLUMN)88(COLUMN)74 Philadelphia(COLUMN)85(COLUMN)68 Phoenix(COLUMN)112(COLUMN)78 Pittsburgh(COLUMN)83(COLUMN)56 Portland, Maine(COLUMN)64(COLUMN)54 Portland, Ore.(COLUMN)64(COLUMN)57 Providence(COLUMN)85(COLUMN)66 Raleigh(COLUMN)90(COLUMN)67 Rapid City(COLUMN)78(COLUMN)59 Reno(COLUMN)86(COLUMN)39 Richmond(COLUMN)87(COLUMN)68 St. Louis(COLUMN)78(COLUMN)67 St. Prbg.-Tampa(COLUMN)86(COLUMN)73 Salt Lake City(COLUMN)90(COLUMN)55 San Antonio(COLUMN)92(COLUMN)73 San Diego(COLUMN)85(COLUMN)67 San Francisco(COLUMN)63(COLUMN)53 San Juan(COLUMN)89(COLUMN)76 St. Ste. Marie(COLUMN)64(COLUMN)41 Seattle(COLUMN)71(COLUMN)55 Shreveport(COLUMN)90(COLUMN)73 Sioux Falls(COLUMN)71(COLUMN)57 Spokane(COLUMN)82(COLUMN)51 Syracuse(COLUMN)83(COLUMN)55 Topeka(COLUMN)78(COLUMN)62 Tucson(COLUMN)105(COLUMN)74 Tulsa(COLUMN)74(COLUMN)65 Washington(COLUMN)88(COLUMN)69 Wichita(COLUMN)78(COLUMN)66(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)57 Amsterdam(COLUMN)rain(COLUMN)1 p.m.(COLUMN)57 Ankara(COLUMN)pt. cldy(COLUMN)3 p.m.(COLUMN)81 Athens(COLUMN)clear(COLUMN)2 p.m.(COLUMN)88 Auckland(COLUMN)clear(COLUMN)12 p.m.(COLUMN)48 Berlin(COLUMN)clear(COLUMN)1 p.m.(COLUMN)73 Birmingham(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)57 Bonn(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)59 Brussels(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)59 Cairo(COLUMN)clear(COLUMN)2 p.m.(COLUMN)111 Casablanca(COLUMN)clear(COLUMN)12 p.m.(COLUMN)70 Copenhagen(COLUMN)clear(COLUMN)1 p.m.(COLUMN)68 Dublin(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)55 Geneva(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)68 Hong Kong(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)84 Jerusalem(COLUMN)clear(COLUMN)2 p.m.(COLUMN)90 Lisbon(COLUMN)rain(COLUMN)12 p.m.(COLUMN)64 London(COLUMN)rain(COLUMN)1 p.m.(COLUMN)59 Madrid(COLUMN)clear(COLUMN)1 p.m.(COLUMN)73 Malta(COLUMN)clear(COLUMN)1 p.m.(COLUMN)79 Manila(COLUMN)rain(COLUMN)8 p.m.(COLUMN)79 Moscow(COLUMN)cloudy(COLUMN)3 p.m.(COLUMN)63 New Delhi(COLUMN)cloudy(COLUMN)5 p.m.(COLUMN)97 Nice(COLUMN)clear(COLUMN)1 p.m.(COLUMN)72 Olso(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)70 Paris(COLUMN)rain(COLUMN)1 p.m.(COLUMN)61 Peking(COLUMN)pt. cldy(COLUMN)8 p.m.(COLUMN)88 Rome(COLUMN)clear(COLUMN)1 p.m.(COLUMN)75 Saigon(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)81 Stockholm(COLUMN)clear(COLUMN)1 p.m.(COLUMN)73 Sydney(COLUMN)pt. cldy(COLUMN)10 p.m.(COLUMN)50 Tunis(COLUMN)clear(COLUMN)1 p.m.(COLUMN)81 Vienna(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)68 Warsaw(COLUMN)rain(COLUMN)1 p.m.(COLUMN)73(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)fair(COLUMN)90(COLUMN)76 Barbados(COLUMN)pt. cldy(COLUMN)86(COLUMN)78 Bermuda(COLUMN)cloudy(COLUMN)80(COLUMN)73 Calgary(COLUMN)clear(COLUMN)75(COLUMN)50 Edmonton(COLUMN)cloudy(COLUMN)73(COLUMN)52 Havana(COLUMN)storm(COLUMN)88(COLUMN)76 Kingston(COLUMN)fair(COLUMN)90(COLUMN)80 Montego Bay(COLUMN)sunny(COLUMN)90(COLUMN)74 Mexico City(COLUMN)cloudy(COLUMN)75(COLUMN)50 Monterrey(COLUMN)fair(COLUMN)96(COLUMN)74 Montreal(COLUMN)cloudy(COLUMN)77(COLUMN)66 Nassau(COLUMN)pt. Cldy.(COLUMN)90(COLUMN)77 Ottawa(COLUMN)clear(COLUMN)77(COLUMN)59 Regina(COLUMN)clear(COLUMN)81(COLUMN)59 St. Kitts(COLUMN)pt. cldy.(COLUMN)89(COLUMN)79 St. Thomas(COLUMN)cloudy(COLUMN)90(COLUMN)77 Toronto(COLUMN)clear(COLUMN)79(COLUMN)48 Vancouver(COLUMN)cloudy(COLUMN)70(COLUMN)57 Veracruz(COLUMN)pt. cldy.(COLUMN)88(COLUMN)73 Winnipeg(COLUMN)clear(COLUMN)77(COLUMN)55(END TABLE)