Washington: Today - Mostly sunny, highs in mid to upper [WORD ILLEGIBLE] lows in low to mid 70s. Chance of rain 10 per cent today, 20 per cent tonight. Wednesday - Partly cloudy with chance or rain, highs in [WORD ILLEGIBLE] to mid 90s.

Maryland: Today - Mostly sunny, highs in 80s, lows in mid 60s to mid 70s. Wednesday - Partly cloudy with chance of rain, highs in mid 80s to mid 90s.

Virginia: Today - Humid, highs in mid 80s to low 90s, lows in mid [WORD ILLEGIBLE] to mid 70s. Chance of afternoon or evening showers. Wednesday - Humid with chance of rain, highs in 90s.

Lower Potomac and Chesapeake Bay: Today - Fair today becoming partly cloudy tonight with [WORD ILLEGIBLE] visibility through tonight.Winds should be southwesterly at 5 to 10 knots through tonight.

Extended Area Outlook: For Thursday through Saturday - Humid skies with chance of afternoon or evening showers through period. Highs should average in mid [WORD ILLEGIBLE] to low 90s, lows in mid 60s to mid 70s through period. Washington's normal temperature rang for this time of year is from 86 to 67.

Atlantic Ocean Beaches from Cape May through Maryland: Today - Mostly sunny, high near [WORD ILLEGIBLE] Wednesday - Partly cloudy with chance of rain, high in 80s. Water temperatures should be in low to mid 70s both days.

Atlantic Ocean Beaches from Cape Hafferas through Virginia: Today and Wednesday - Partly cloudy with chance of afternoon or evening showers, highs is upper 80s to near 90. Water temperatures should be in mid 70s to near [WORD ILLEGIBLE]

West Virginia: Today - Cloudy, highs in low to mid 80s, lows in mid 60s to low 70s. There is a chance of afternoon and evening showers. Wednesday - Change of rain, highs in mid to upper 80s.

The National Weather Forecast for Today - Thundershowers are expected from the eastern portions of Kansas, Oklahoma and Texas across the Mississippi Valley into the Great Lakes, Ohio Valley, Appalachians, mid Atlantic states and the Carolinas. There will also be scattered thundershowers [WORD ILLEGIBLE] the central and southern Rockies and southern plateau. Cloudy skies will cover South Dakota, but other areas will be clear or partly cloudy. Temperatures will be a little warmer in Montana and across the southern and eastern sections of the Great Lakes region. Cooler weather is forecast from Wyoming and northern Colorado into [WORD ILLEGIBLE] and also along the New [WORD ILLEGIBLE] coast. Little temperature change is expected elsewhere.

ALMANAC DATA FOR Aug. 16, 1977: Sun rises 8:09 a.m., sets [WORD ILLEGIBLE] p.m.; moon rises 6:22 a.m., sets 8:02 p.m. Tides: High 9:44 a.m. and 10:09 p.m. low 4:17 a.m. and 4:37 p.m. High and low tides at the following locations can be obtained by subtracting the hours indicated from the tides above. Annanpolis (3 1/2); Bloody Point, -(4 1/2); Deale, Md. (4 1/2); Colonial Beach (16); Norfolk (1 1/2); Virginia Beach (1); Solomons Island (6 1/2); Point Lookout (7). Pollen count: 6 English Plaintain (note: 7 or higher is considered undesirable.)

The Council of Government's Air Quality Index for yesterday showed the high reading in the Washington Area during the 2 to 3 p.m. period was 105 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 hazardous, 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 will be near 2.8 feet today.

Washington data at 8 p.m. (EDT) yesterday: Highest temperature since 8 a.m. yesterday, 88 degrees at 3:04 p.m. Lowest temperature since midnight, 72 degrees at 6:20 a.m. Excess of temperature since Aug. 1, 57 degrees. Excess of temperature since Jan. 1, 334 degrees. Record high temperature for today, 95 degrees in 1939. Record low temperature for today, 54 degrees in 1921. Relative humidity: Maximum, 97 per cent at 4 a.m. Minimum, 59 per cent at 2 p.m. 24 hour precipitation, none. Excess of precipitation since Aug. 1, [WORD ILLEGIBLE] inches. Deficiency of precipitation since Jan. 1, 5.72 inches. Highest observed wind since 8 a.m. 13 mles per hour form the S.E. at 5:53 p.m. Peak gust since 8 a.m., 15 miles per hour from the S.E. at 5:51 a.m. Local Temp., Humidity(TABLE) T.(COLUMN)H. 12 mid.(COLUMN)75(COLUMN)91 1 a.m.(COLUMN)75(COLUMN)91 2 a.m.(COLUMN)74(COLUMN)94 3 a.m.(COLUMN)74(COLUMN)94 4 a.m.(COLUMN)73(COLUMN)97 5 a.m.(COLUMN)73(COLUMN)97 6 a.m.(COLUMN)73(COLUMN)94 7 a.m.(COLUMN)73(COLUMN)94 8 a.m.(COLUMN)75(COLUMN)85 9 a.m.(COLUMN)78(COLUMN)77 10 a.m.(COLUMN)81(COLUMN)69 11 a.m.(COLUMN)83(COLUMN)65 12 noon(COLUMN)85(COLUMN)63 1 p.m.(COLUMN)85(COLUMN)63 2 p.m.(COLUMN)89(COLUMN)59 3 p.m.(COLUMN)86(COLUMN)63 4 p.m.(COLUMN)87(COLUMN)59 5 p.m.(COLUMN)86(COLUMN)61 6 p.m.(COLUMN)85(COLUMN)63(END TABLE) Temperatures ending 8 a.m.(EDT) Yesterday(TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)81(COLUMN)59 Albuquerque(COLUMN)83(COLUMN)67 Amarillo(COLUMN)88(COLUMN)68 Anchorage(COLUMN)65(COLUMN)55 Asheville(COLUMN)85(COLUMN)69 Atlanta(COLUMN)87(COLUMN)69 Atlantic City(COLUMN)78(COLUMN)70 Austin(COLUMN)99(COLUMN)76 Baltimore(COLUMN)82(COLUMN)70 Billings(COLUMN)79(COLUMN)52 Birmingham(COLUMN)92(COLUMN)74 Bismarck(COLUMN)70(COLUMN)55 Boise(COLUMN)95(COLUMN)61 Boston(COLUMN)83(COLUMN)67 Brownsville(COLUMN)97(COLUMN)79 Buffalo(COLUMN)75(COLUMN)55 Burlington, Vt.(COLUMN)77(COLUMN)52 Casper(COLUMN)91(COLUMN)54 Charleston, S.C.(COLUMN)81(COLUMN)74 Ch'ston, W.Va.(COLUMN)79(COLUMN)66 Charlotte, N.C.(COLUMN)90(COLUMN)73 Cheyenne(COLUMN)72(COLUMN)58 Chicago(COLUMN)75(COLUMN)62 Cincinnati(COLUMN)84(COLUMN)69 Cleveland(COLUMN)76(COLUMN)62 Columbia, S.C.(COLUMN)79(COLUMN)70 Columbus, Ohio(COLUMN)86(COLUMN)68 Dal-Ft. Worth(COLUMN)99(COLUMN)76 Dayton(COLUMN)85(COLUMN)66 Denver(COLUMN)80(COLUMN)64 Des Moines(COLUMN)74(COLUMN)62 Detroit(COLUMN)82(COLUMN)59 Duluth(COLUMN)68(COLUMN)44 EL Paso(COLUMN)90(COLUMN)67 Fairbanks(COLUMN)84(COLUMN)63 Fargo(COLUMN)75(COLUMN)60 Flagstaff(COLUMN)80(COLUMN)57 Great Falls(COLUMN)61(COLUMN)49 Hartford(COLUMN)80(COLUMN)61 Helena(COLUMN)76(COLUMN)48 Honolulu(COLUMN)90(COLUMN)75 Houston(COLUMN)90(COLUMN)79 Indianapolis(COLUMN)85(COLUMN)67 Jackson, Miss.(COLUMN)94(COLUMN)74 Jacksonville(COLUMN)90(COLUMN)73 Juneau(COLUMN)79(COLUMN)50 Kansas City(COLUMN)81(COLUMN)63 Las Vegas(COLUMN)110(COLUMN)80 Little Rock(COLUMN)96(COLUMN)73 Los Angeles(COLUMN)85(COLUMN)64 Louisville(COLUMN)86(COLUMN)70 Memphis(COLUMN)83(COLUMN)75 Miami Beach(COLUMN)85(COLUMN)80 Midland(COLUMN)95(COLUMN)71 Milwaukee(COLUMN)70(COLUMN)53 Mols-St. Paul(COLUMN)78(COLUMN)51 Nashville(COLUMN)82(COLUMN)71 New Orleans(COLUMN)92(COLUMN)75 New York(COLUMN)76(COLUMN)68 Norfolk(COLUMN)94(COLUMN)76 North Platte(COLUMN)80(COLUMN)64 Oklahoma City(COLUMN)94(COLUMN)72 Omaha(COLUMN)72(COLUMN)60 Orlando(COLUMN)90(COLUMN)72 Philadelphia(COLUMN)81(COLUMN)71 Phoenix(COLUMN)104(COLUMN)89 Pittsburgh(COLUMN)79(COLUMN)61 Portland, Me.(COLUMN)79(COLUMN)58 Portland, Ore.(COLUMN)85(COLUMN)61 Providence(COLUMN)79(COLUMN)65 Raleigh(COLUMN)89(COLUMN)72 Rapid City(COLUMN)77(COLUMN)60 Reno(COLUMN)95(COLUMN)49 Richmond(COLUMN)93(COLUMN)74 St. Louis(COLUMN)90(COLUMN)70 St. Prgb-Tamma(COLUMN)91(COLUMN)75 Salt Lake City(COLUMN)95(COLUMN)68 San Antonio(COLUMN)94(COLUMN)78 San Diego(COLUMN)77(COLUMN)68 San Francisco(COLUMN)66(COLUMN)57 St. Ste. Marie(COLUMN)64(COLUMN)37 Seattle(COLUMN)79(COLUMN)57 Shreveport(COLUMN)88(COLUMN)73 Sioux Falls(COLUMN)80(COLUMN)62 Syracuse(COLUMN)78(COLUMN)53 Topeka(COLUMN)88(COLUMN)64 Tuscon(COLUMN)97(COLUMN)79 Tulsa(COLUMN)93(COLUMN)71 Washington(COLUMN)84(COLUMN)72 Wichita(COLUMN)90(COLUMN)69(END TABLE) Tepmeratures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp Aberdeen(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)61 Amsterdam(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)70 Ankara(COLUMN)pt. cldy(COLUMN)3 p.m.(COLUMN)86 Athens(COLUMN)clear(COLUMN)2 p.m.(COLUMN)84 Auckland(COLUMN)clear(COLUMN)midnight(COLUMN)48 Berlin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)66 Birmingham(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)66 Brussels(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)72 Cairo(COLUMN)clear(COLUMN)2 p.m.(COLUMN)93 Casablanca(COLUMN)pt. cldy(COLUMN)noon(COLUMN)75 Copenhagen(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)68 Dublin(COLUMN)clear(COLUMN)1 p.m.(COLUMN)68 Geneva(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)73 Hong Kong(COLUMN)pt. cldy(COLUMN)8 p.m.(COLUMN)84 Lisbon(COLUMN)clear(COLUMN)noon(COLUMN)82 London(COLUMN)haze(COLUMN)1 p.m.(COLUMN)68 Madrid(COLUMN)clear(COLUMN)1 p.m.(COLUMN)90 Malta(COLUMN)clear(COLUMN)1 p.m.(COLUMN)88 Manila(COLUMN)storm(COLUMN)8 p.m.(COLUMN)81 Mascow(COLUMN)cloudy(COLUMN)3 p.m.(COLUMN)61 New Delhi(COLUMN)clear(COLUMN)5 p.m.(COLUMN)91 Nice(COLUMN)clear(COLUMN)1 p.m.(COLUMN)77 Oslo(COLUMN)clear(COLUMN)1 p.m.(COLUMN)72 Paris(COLUMN)clear(COLUMN)1 p.m.(COLUMN)72 Peking(COLUMN)clear(COLUMN) -(COLUMN)66 Rome(COLUMN)clear(COLUMN)1 p.m.(COLUMN)81 Saigon(COLUMN)storm(COLUMN)8 p.m.(COLUMN)79 Sofia(COLUMN)clear(COLUMN)2 p.m.(COLUMN)-70 Stockholm(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)64 Sydney(COLUMN)clear(COLUMN)10 p.m.(COLUMN)48 Tel Aviv(COLUMN)clear(COLUMN)2 p.m.(COLUMN)88 Tokyo(COLUMN)cloudy(COLUMN)9 p.m.(COLUMN)72 Vienna(COLUMN)raiN(COLUMN)1 p.m.(COLUMN)70 Warsaw(COLUMN)rain(COLUMN)1 p.m.(COLUMN)55(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)pt. cldy(COLUMN)94(COLUMN)77 Barbados(COLUMN)sunny(COLUMN)88(COLUMN)78 Bermuda(COLUMN)fair(COLUMN)94(COLUMN)81 Bogota(COLUMN)cloudy(COLUMN)65(COLUMN)45 Calgary(COLUMN)clear(COLUMN)55(COLUMN)39 Cullacan(COLUMN)cloudy(COLUMN)94(COLUMN)75 Edmonton(COLUMN)clear(COLUMN)64(COLUMN)37 Havana(COLUMN)fair(COLUMN)92(COLUMN)75 Kingston(COLUMN)fair(COLUMN)91(COLUMN)75 Montego Bay(COLUMN)sunny(COLUMN)89(COLUMN)75 Mexico City(COLUMN)cloudy(COLUMN)73(COLUMN)59 Monterey(COLUMN)pt. cldy(COLUMN)97(COLUMN)73 Montreal(COLUMN)clear(COLUMN)75(COLUMN)50 Nassau(COLUMN)fair(COLUMN)89(COLUMN)73 Ottawa(COLUMN)clear(COLUMN)75(COLUMN)52 Regina(COLUMN)clear(COLUMN)64(COLUMN)41 St. Kitts(COLUMN)pt. cldy(COLUMN)89(COLUMN)74 St. Thomas(COLUMN)pt. cldy(COLUMN)90(COLUMN)78 Toronto(COLUMN)clear(COLUMN)72(COLUMN)48 Vancouver(COLUMN)clear(COLUMN)79(COLUMN)61 Veracruz(COLUMN)pt. cldy(COLUMN)88(COLUMN)78 Winnipeg(COLUMN)cloudy(COLUMN)70(COLUMN)54(END TABLE)