Washington: Today - Sunny, high in the low 90s, low in the low 70s. The chance of rain is 20 per cent today and 10 per cent tonight. Thursday, high in the low 90s.

Maryland and Virginia: Today - Sunny, highs from the mid 80s to the mid 90s, lows in the 70s. Thursday - Sunny, highs from the mid 80s to the mid 90s.

Lower Potomac and Chesapeake Bay. Today - Fair with a chance of thundershowers. Wind will be from the southwest at less than 18 knots. Visibility will be from 2 to 5 miles. Waves in unprotected waters will be less than 2 feet.

Atlantic Ocean Beaches from Cape May to Delaware: Today and Thursday - Sunny, highs from the mid 80s to the mid 90s. Water temperatures will be in the low 70s.

Atlantic Ocean Beaches from Maryland to Cape Hatteras: Today - Partly cloudy, chance of rain highs from the low 80s to near 90s. Thursday - Sunny, highs from the low 80s to near 90.Water temperatures will be from the mid to the upper 70s.

Extended Area Forecast for Friday through Sunday: - Hot and humid through the period. There will be a chance of afternoon thundershowers on each day. Highs will be from the mid 80s to the mid 90s, lows from the mid 60s to the mid 70s. Normal Washington temperatures for the period are a high of 88 and a low of 69.

West Virginia: Today - Partly cloudy, high from the 80s to the low 90s. Thursday - Sunny, high from the upper 70s to the 80s.

The National Weather Forecast for Today - Thundershowers will fall over the lower Ohio Valley along the eastern Gulf Coast and in the southern plateau. Showers will fall over New England and northern Missouri Valley. Partly cloudy skies will cover the Southeast as well as the central and western sections of the country. Sunny skies will prevail over the lower Great Lakes, the southern Plains and along the Pacific Coast. Temperatures will remain hot over the Southeast and central states. Mild temperatures will dominate the Pacific northwest while elsewhere, temperatures will be warm.

Almanac Data for today - Sun rises 5:53 a.m., sets 8:34 p.m.; moon rises 3:47 a.m., sets 6:20 p.m. Tides: High 6:50 a.m. and 7:19 p.m., low 1:04 a.m. and 1:45 p.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).Pollen count: 40 grass (not more than 7 or higher is considered undesirable).

The Council of Governments' Air Quality Index for yesterday showed the high reading in the Washington area during the 2 p.m. to 3 p.m. period was 120 for the pollutant, photochemical oxidants. When the index exceeds 100 the air becomes hazardous and persons with lung, heart and eye problems should restrict their activity. The forecast for today indicates the air quality will improve.

The National Weather Service forecasts that the Potomac River stage at Little Falls will be near 2.8 feet. Local Temp., Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 mid.(COLUMN)78(COLUMN)85 1 a.m.(COLUMN)78(COLUMN)85 2 a.m.(COLUMN)77(COLUMN)88 3 a.m.(COLUMN)77(COLUMN)88 4 a.m.(COLUMN)78(COLUMN)85 5 a.m.(COLUMN)78(COLUMN)85 6 a.m.(COLUMN)78(COLUMN)86 7 a.m.(COLUMN)78(COLUMN)85 8 a.m.(COLUMN)78(COLUMN)85 9 a.m.(COLUMN)79(COLUMN)82 10 a.m.(COLUMN)79(COLUMN)82 11 a.m.(COLUMN)79(COLUMN)82 12 noon(COLUMN)83(COLUMN)72 1 p.m.(COLUMN)86(COLUMN)66 2 p.m.(COLUMN)88(COLUMN)61 3 p.m.(COLUMN)90(COLUMN)88 4 p.m.(COLUMN)92(COLUMN)56 5 p.m.(COLUMN)91(COLUMN)56 6 p.m.(COLUMN)75(COLUMN)94 7 p.m.(COLUMN)74(COLUMN)82(END TABLE) Temperatures ending 8 a.m. (EDT) Yesterday(TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)79(COLUMN)63 Alburquerque(COLUMN)90(COLUMN)69 Amarillo(COLUMN)99(COLUMN)72 Anchorage(COLUMN)81(COLUMN)63 Asheville(COLUMN)92(COLUMN)67 Atlanta(COLUMN)91(COLUMN)69 Atlantic City(COLUMN)75(COLUMN)72 Austin(COLUMN)94(COLUMN)75 Baltimore(COLUMN)81(COLUMN)74 Billings(COLUMN)81(COLUMN)54 Birmingham(COLUMN)89(COLUMN)74 Bismarck(COLUMN)67(COLUMN)50 Boise(COLUMN)90(COLUMN)62 Boston(COLUMN)83(COLUMN)63 Brownsville(COLUMN)94(COLUMN)74 Buffalo(COLUMN)79(COLUMN)70 Burlington(COLUMN)82(COLUMN)65 Casper(COLUMN)83(COLUMN)46 Charleston, S.C.(COLUMN)94(COLUMN)80 Char'ton, W.Va.(COLUMN)97(COLUMN)71 Charlotte(COLUMN)93(COLUMN)73 Cheyenne(COLUMN)80(COLUMN)49 Chicago(COLUMN)85(COLUMN)75 Cincinnati(COLUMN)84(COLUMN)73 Cleveland(COLUMN)83(COLUMN)70 Columbia, S.C.(COLUMN)101(COLUMN)71 Columbus(COLUMN)83(COLUMN)71 Dal.-Ft. Worth(COLUMN)100(COLUMN)75 Dayton(COLUMN)86(COLUMN)73 Denver(COLUMN)89(COLUMN)56 Des Moines(COLUMN)93(COLUMN)70 Detroit(COLUMN)81(COLUMN)69 Duluth(COLUMN)75(COLUMN)63 El Paso(COLUMN)104(COLUMN)66 Fairbanks(COLUMN)81(COLUMN)63 Fargo(COLUMN)76(COLUMN)60 Flagstaff(COLUMN)83(COLUMN)50 Great Falls(COLUMN)78(COLUMN)61 Hartford(COLUMN)83(COLUMN)62 Helena(COLUMN)76(COLUMN)56 Honolulu(COLUMN)87(COLUMN)75 Houston(COLUMN)93(COLUMN)79 Indianapolis(COLUMN)84(COLUMN)71 Jackson, Miss.(COLUMN)87(COLUMN)71 Jacksonville(COLUMN)95(COLUMN)68 Juneau(COLUMN)74(COLUMN)49 Kansas City(COLUMN)85(COLUMN)70 Las Vegas(COLUMN)107(COLUMN)74 Little Rock(COLUMN)95(COLUMN)74 Los Angeles(COLUMN)80(COLUMN)61 Lousiville(COLUMN)85(COLUMN)74 Memphis(COLUMN)91(COLUMN)75 Miami Beach(COLUMN)86(COLUMN)83 M'Land-Odes.(COLUMN)101(COLUMN)70 Milwaukee(COLUMN)78(COLUMN)69 Mpls-St. Paul(COLUMN)84(COLUMN)63 Nashville(COLUMN)91(COLUMN)75 New Orleans(COLUMN)90(COLUMN)73 New York(COLUMN)81(COLUMN)68 Norfolk(COLUMN)86(COLUMN)74 North Platte(COLUMN)81(COLUMN)56 Oklahoma City(COLUMN)97(COLUMN)76 Omaha(COLUMN)83(COLUMN)67 Orlando(COLUMN)92(COLUMN)71 Philadelphia(COLUMN)80(COLUMN)70 Phoenix(COLUMN)107(COLUMN)84 Pittsburgh(COLUMN)85(COLUMN)66 Portland, Me.(COLUMN)76(COLUMN)60 Portland, Ore.(COLUMN)79(COLUMN)56 Providence(COLUMN)80(COLUMN)62 Raleigh(COLUMN)93(COLUMN)70 Rapid City(COLUMN)82(COLUMN)52 Reno(COLUMN)96(COLUMN)51 Richmond(COLUMN)87(COLUMN)71 St. Louis(COLUMN)85(COLUMN)70 St. Pete-Tampa(COLUMN)94(COLUMN)76 Salt Lake City(COLUMN)90(COLUMN)61 San Antonio(COLUMN)93(COLUMN)76 San Diego(COLUMN)72(COLUMN)66 San Francisco(COLUMN)64(COLUMN)53 St. Ste. Marie(COLUMN)75(COLUMN)55 Seattle(COLUMN)74(COLUMN)56 Shreveport(COLUMN)95(COLUMN)72 Sioux Falls(COLUMN)86(COLUMN)59 Spokane(COLUMN)80(COLUMN)55 Syracuse(COLUMN)80(COLUMN)64 Topeka(COLUMN)87(COLUMN)71 Tucson(COLUMN)97(COLUMN)77 Tulsa(COLUMN)97(COLUMN)80 Washington(COLUMN)86(COLUMN)76 Wichita(COLUMN)100(COLUMN)78(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)55 Amsterdam(COLUMN)clear(COLUMN)1 p.m.(COLUMN)70 Ankara(COLUMN)pt. cldy(COLUMN)3 p.m.(COLUMN)79 Athens(COLUMN)cloudy(COLUMN)2 p.m.(COLUMN)86 Auckland(COLUMN)clear(COLUMN)m'night(COLUMN)46 Berlin(COLUMN)clear(COLUMN)1 p.m.(COLUMN)79 Birmingham(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)59 Brussels(COLUMN)clear(COLUMN)1 p.m.(COLUMN)73 Cairo(COLUMN)clear(COLUMN)2 p.m.(COLUMN)97 Casablanca(COLUMN)clear(COLUMN)noon(COLUMN)70 Copenhagen(COLUMN)clear(COLUMN)1 p.m.(COLUMN)68 Dublin(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)68 Geneva(COLUMN)clear(COLUMN)1 p.m.(COLUMN)77 Hong Kong(COLUMN)clear(COLUMN)8 p.m.(COLUMN)84 Lisbon(COLUMN)pt. cldy(COLUMN)noon(COLUMN)75 London(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)66 Madrid(COLUMN)clear(COLUMN)1 p.m.(COLUMN)81 Malta(COLUMN)clear(COLUMN)1 p.m.(COLUMN)86 Manila(COLUMN)pt. cldy(COLUMN)8 p.m.(COLUMN)81 Moscow(COLUMN)rain(COLUMN)3 p.m.(COLUMN)61 Nice(COLUMN)clear(COLUMN)1 p.m.(COLUMN)77 Oslo(COLUMN)clear(COLUMN)1 p.m.(COLUMN)79 Paris(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)81 Peking(COLUMN)rain(COLUMN)8 p.m.(COLUMN)75 Rome(COLUMN)clear(COLUMN)1 p.m.(COLUMN)84 Saigon(COLUMN)rain(COLUMN)8 p.m.(COLUMN)77 Sofia(COLUMN)pt. cldy(COLUMN)2 p.m.(COLUMN)70 Stockholm(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)70 Sydney(COLUMN)clear(COLUMN)10 p.m.(COLUMN)55 Tel Aviv(COLUMN)clear(COLUMN)2 p.m.(COLUMN)91 Tokyo(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)77 Tunis(COLUMN)clear(COLUMN)1 p.m.(COLUMN)86 Vienna(COLUMN)clear(COLUMN)1 p.m.(COLUMN)81 Warsaw(COLUMN)clear(COLUMN)1 p.m.(COLUMN)72(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)clear(COLUMN)92(COLUMN)79 Barbados(COLUMN)pt. cldy(COLUMN)86(COLUMN)76 Bermuda(COLUMN)pt. sunny(COLUMN)85(COLUMN)78 Calgary(COLUMN)pt. cldy(COLUMN)70(COLUMN)50 Culiacan(COLUMN)pt. sunny(COLUMN)99(COLUMN)74 Edmonton(COLUMN)cloudy(COLUMN)73(COLUMN)46 Havana(COLUMN)clear(COLUMN)90(COLUMN)77 Kingston(COLUMN)pt. sunny(COLUMN)90(COLUMN)77 Montego Bay(COLUMN)pt. cldy(COLUMN)83(COLUMN)76 Mexico City(COLUMN)pt. sunny(COLUMN)76(COLUMN)56 Monterrey(COLUMN)clear(COLUMN)97(COLUMN)70 Montreal(COLUMN)cloudy(COLUMN)77(COLUMN)66 Nassau(COLUMN)pt. cldy(COLUMN)83(COLUMN)74 Ottawa(COLUMN)cloudy(COLUMN)77(COLUMN)66 Regina(COLUMN)pt. cldy(COLUMN)72(COLUMN)48 St. Kitts(COLUMN)pt. sunny(COLUMN)89(COLUMN)76 St. Thomas(COLUMN)clear(COLUMN)89(COLUMN)78 Toronto(COLUMN)rain(COLUMN)77(COLUMN)66 Vancouver(COLUMN)cloudy(COLUMN)68(COLUMN)55 Veracruz(COLUMN)cloudy(COLUMN)84(COLUMN)74 Winnipeg(COLUMN)pt. cldy(COLUMN)72(COLUMN)57(END TABLE)