Washington: Today - Humid, high in mid 90s, low in low 70s. Chance of rain 20 per cent this morning, 60 per cent this afternoon and evening. Wednesday - Humid with chance of rain, highs in mid 90s.

Maryland and Virginia: Today - Humid with chance of late afternoon and evening showers, high in 90s, lows in 60s and 70s. Wednesday - humid with chance os showers, highs in 90s.

Lower Potomac and Chesapeake Bay: Today - Humid with chance of afternoon and evening showers with fair to poor visibility. Winds should be southwesterly at 5 to 18 knots, through tonight.

Extended Area Outlook: For Thursday through Saturday - Humid with chance of afternoon showers, highs in 90s, lows in 70s, slightly cooler in mountains. Washington's normal temperature range for this time of year is 88 to 69.

West Virginia: Today - Humid, chance of rain, highs in mid 80s to mid 90s, lows in mid 60s to mid 70s. Wednesday - humid with chance of rain, highs in mid 80s to mid 90s.

Atlantic Ocean Beaches from Cape May to Cape Hatteras: Today and Wednesday - Mostly sunny and humid with chance of afternoon or evening showers, highs in upper 80s to mid 90s, Water temperatures should range from low 70s in north to near 80 in south.

The National Weather Forecast for Today - Showers and thunderstorms are forecast from the northern Plains and western Great Lakes southeast through the sougheastern states and the southern Atlantic Coast states. Thunderstorms will be most likely in the middle Mississippi Valley, Virginia and southwest Pennsylvania and over central Florida. Mild temperatures will be found across the northern Rockies, North Dakota and northern Minnesota. The rest of the nation will be warm to hot with temperatures of 90 and above covering the southern half of the nation. Skies will generally be mostly be mostly sunny. Excessive humidity will accompany the high temperatures in the southeast portion of the nation.

Almanac Data for Aug. 9, 1977: Sun rises 6:16 a.m., sets 8:11 p.m.; moon rises 1:43 a.m., sets 3:14 p.m. Tides: High 4:26 a.m. and 4:52 p.m., Low 11:29 a.m. and 11:38 p.m. High and low tides at the following locations can be obtained by subtraction the hours indicated from the tides above. Annapolis (3 1/2); Brady Point Lighthouse (4 1/2); Deake Md (4 1/2); Colonial Beach [WORD ILLEGIBLE] Norfolk (1 1/2); Virginia Beach [WORD ILLEGIBLE] Solomons Islnad (4 1/2); Point Liowcut (7) Pollen count: 6 English Plaintain (note: more than 7 or higher is considered undesirable.)

The Council of Government's Air Quality Index for yesterday showed the high reading in the Washington

Washington data at 8 p.m. (EDT) yesterday: Highest temperature since 6 a.m. yesterday, 94 degrees at 2:20 p.m. Lowest temperature since midnight, 73 degrees at 6:20 a.m. Excess of temperature since Aug. 1, 26 degrees. Excess of temperature since Jan 1, 305 degrees. Record high temperature for today, 102 degrees in 1980. Record low temperature for today, 58 degrees in 1902. Relative humidity: Maximum 94 per cent at 6 a.m.: Minimum 49 per cent at 5 p.m. 24 hour precipitation .04 inches. Excess of precipitation since Aug. 1, .33 inches. Deficiency of precipitation since Jan. 1, 6.15 inches. Highest observed wind since 8 a.m. 12 miles per hour from the s.w. at 3 p.m. Peak sust since 8 a.m., 23 miles per hour from the s.w. at 2:30 p.m.

area curing the 2 to 3 p.m. period was 75 for the pollutant, photochemical oxidants, index values between 50 and 99 indicate unhealthy air quality. When the index exceeds 100, the air is considered hazardous, and the 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 state at Little Falls will be rear 2.7 feet today. Local Temp. Humidity(TABLE) Time(COLUMN)H.(COLUMN)L. 12 mid.(COLUMN)78(COLUMN)82 1 a.m.(COLUMN)77(COLUMN)85 2 a.m.(COLUMN)76(COLUMN)88 3 a.m.(COLUMN)76(COLUMN)88 4 a.m.(COLUMN)76(COLUMN)83 5 a.m.(COLUMN)75(COLUMN)91 6 a.m.(COLUMN)74(COLUMN)94 7 a.m.(COLUMN)75(COLUMN)91 8 a.m.(COLUMN)77(COLUMN)85 9 a.m.(COLUMN)82(COLUMN)72 10 a.m.(COLUMN)86(COLUMN)63 11 a.m.(COLUMN)87(COLUMN)59 12 noon(COLUMN)89(COLUMN)56 1 p.m.(COLUMN)80(COLUMN)54 2 p.m.(COLUMN)89(COLUMN)54 3 p.m.(COLUMN)92(COLUMN)61 4 p.m.(COLUMN)91(COLUMN)62 5 p.m.(COLUMN)93(COLUMN)49 6 p.m.(COLUMN)91(COLUMN)52(END TABLE) Temperatures ending 8 a.m. (EDT) yesterday.(TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)80(COLUMN)70 Albuqueraque(COLUMN)97(COLUMN)69 Amarlib(COLUMN)94(COLUMN)73 Anchorage(COLUMN)61(COLUMN)56 Asheville(COLUMN)87(COLUMN)65 Atlanta(COLUMN)91(COLUMN)72 Atlantic City(COLUMN)92(COLUMN)72 Austin(COLUMN)93(COLUMN)74 Baltimore(COLUMN)96(COLUMN)72 Bilings(COLUMN)82(COLUMN)57 Birmingham(COLUMN)93(COLUMN)75 Bismarce(COLUMN)75(COLUMN)45 Boise(COLUMN)81(COLUMN)59 Boston(COLUMN)78(COLUMN)67 Browsville(COLUMN)95(COLUMN)75 Buffalo(COLUMN)76(COLUMN)69 Burlington, Vt.(COLUMN)81(COLUMN)69 Casper(COLUMN)84(COLUMN)55 Charlotte, N.C.(COLUMN)96(COLUMN)74 Vheyerne(COLUMN)87(COLUMN)53 Chicago(COLUMN)87(COLUMN)73 Cincinnati(COLUMN)85(COLUMN)72 Cleveland(COLUMN)81(COLUMN)67 Columbia, S.C.(COLUMN)94(COLUMN)71 Columbus, O.(COLUMN)85(COLUMN)70 Dal. Ft. north(COLUMN)98(COLUMN)77 Dayton(COLUMN)85(COLUMN)71 Denver(COLUMN)93(COLUMN)62 Des Moires(COLUMN)91(COLUMN)71 Detroit(COLUMN)85(COLUMN)71 Duluth(COLUMN)77(COLUMN)52 El Paso(COLUMN)99(COLUMN)70 Fiarbanks(COLUMN)77(COLUMN)63 Fargo(COLUMN)70(COLUMN)46 Flagstaff(COLUMN)84(COLUMN)55 Great Falls(COLUMN)80(COLUMN)60 Hartford(COLUMN)87(COLUMN)71 Helena(COLUMN)82(COLUMN)50 Honolulu(COLUMN)89(COLUMN)78 Houston(COLUMN)92(COLUMN)83 Indianapolis(COLUMN)83(COLUMN)72 Jackson, Miss.(COLUMN)93(COLUMN)73 Jacksonville(COLUMN)92(COLUMN)73 juneau(COLUMN)63(COLUMN)52 Kansas City(COLUMN)92(COLUMN)77 Las Vegas(COLUMN)106(COLUMN)78 Little Rock(COLUMN)96(COLUMN)77 Los Angeles(COLUMN)84(COLUMN)66 Louisville(COLUMN)91(COLUMN)75 Memphis(COLUMN)96(COLUMN)72 Miami Beach(COLUMN)85(COLUMN)79 Midland(COLUMN)98(COLUMN)74 Milwaukee(COLUMN)82(COLUMN)69 Mois St Paul(COLUMN)86(COLUMN)61 Nashville(COLUMN)96(COLUMN)73 New Orleans(COLUMN)92(COLUMN)74 New York(COLUMN)91(COLUMN)76 Norfolk(COLUMN)102(COLUMN)75 North Platte(COLUMN)89(COLUMN)64 Okia City(COLUMN)96(COLUMN)74 Omana(COLUMN)90(COLUMN)74 Oriando(COLUMN)87(COLUMN)75 Philadephia(COLUMN)93(COLUMN)74 Phoenix(COLUMN)109(COLUMN)92 Pittsburch(COLUMN)78(COLUMN)65 Portland, Me.(COLUMN)77(COLUMN)61 Portland, Ore.(COLUMN)88(COLUMN)59 Providence(COLUMN)87(COLUMN)73 Raleigh(COLUMN)97(COLUMN)71 Rapid City(COLUMN)85(COLUMN)57 Reno(COLUMN)87(COLUMN)43 Richmond(COLUMN)99(COLUMN)77 St. Louis(COLUMN)95(COLUMN)72 St. Prbg Tam(COLUMN)53(COLUMN)77 Sait Lake City(COLUMN)95(COLUMN)60 San Antonio(COLUMN)94(COLUMN)75 San Diego(COLUMN)76(COLUMN)69 San Fran.(COLUMN)67(COLUMN)56 San Juan. P.R.(COLUMN)85(COLUMN)75 St. Ste. Marie(COLUMN)77(COLUMN)53 Seattle(COLUMN)86(COLUMN)56 Shreveport(COLUMN)94(COLUMN)71 Sioux Fails(COLUMN)87(COLUMN)64 Spokane(COLUMN)88(COLUMN)63 Syracuse(COLUMN)75(COLUMN)70 Topeka(COLUMN)96(COLUMN)78 Tucson(COLUMN)99(COLUMN)78 Tulsa(COLUMN)101(COLUMN)79 Washington(COLUMN)94(COLUMN)73 Wichita(COLUMN)98(COLUMN)76(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN) cloudy(COLUMN) 1 p.m.(COLUMN)63 Amsterbum(COLUMN) cloudy(COLUMN) 1 p.m.(COLUMN)64 Ankara(COLUMN)pt. cldy(COLUMN) 3 p.m.(COLUMN)84 Athens(COLUMN)pt. cldy(COLUMN)3 p.m.(COLUMN)88 Auckland clear(COLUMN)midnight(COLUMN)48 Berlin(COLUMN) cloudy(COLUMN)1 p.m.(COLUMN)73 Birmingham(COLUMN) rain(COLUMN)1 p.m.(COLUMN)57 Brussels(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)61 Cairo(COLUMN) clear(COLUMN)2 p.m.(COLUMN)91 Casablamca(COLUMN) clear(COLUMN) noon(COLUMN)72 Cobennagen(COLUMN) cloudy(COLUMN) 1 p.m.(COLUMN)66 Dublin(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)63 Geneva(COLUMN) cloudy(COLUMN) 1 p.m.(COLUMN)70 Hong Kong(COLUMN) clear(COLUMN) 8 p.m.(COLUMN)84 Losbon(COLUMN) clear(COLUMN) noon(COLUMN)73 London(COLUMN) cloudy(COLUMN) 1 p.m.(COLUMN)59 Madrid(COLUMN) clear(COLUMN) 1 p.m.(COLUMN)84 Malta(COLUMN) clear(COLUMN) 1 p.m.(COLUMN)84 Manila cloudy 8 p.m.(COLUMN)84 Moscow(COLUMN) clear(COLUMN) 8 p.m.(COLUMN)81 New Delhi(COLUMN) rain(COLUMN) 5 p.m.(COLUMN)81 Nice(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)77 (COLUMN) cloudy(COLUMN) 1 p.m.(COLUMN)78 Paris(COLUMN) clear(COLUMN) 1 p.m.(COLUMN)70 [WORD ILLEGIBLE] (COLUMN)pt. cldy(COLUMN) 8 p.m.(COLUMN)81 Rome(COLUMN) clear(COLUMN) 8 p.m.(COLUMN)81 Sofia(COLUMN) clear(COLUMN) 2 p.m.(COLUMN)79 Stockholm(COLUMN) clear(COLUMN) 1 p.m.(COLUMN)70 Sydney(COLUMN) clear(COLUMN)10 p.m.(COLUMN)45 Tel Aviv(COLUMN) clear(COLUMN) 2 p.m.(COLUMN)90 Tokyo(COLUMN) rain(COLUMN) 9 p.m.(COLUMN)81 Tunis(COLUMN) lcear(COLUMN) 1 p.m.(COLUMN)83 Vienna(COLUMN)pt. cldy(COLUMN) 1 p.m.(COLUMN)77(END TABLE)