Washington: Today - Cloudy, high in upper 60s, low near 60. Chance of rain is 50 per cent through tonight. Saturday - Partly cloudy, high in low 80s.

Mainland and Virginia: Today - Cloudy with chance of rain, highs in mid 60s, to mid 70s, lows near 60. Saturday - Partly cloudy, highs in low 80s.

Lower Potomac and Chesapeake Bay: Today - Cloudy skies with chance of rain and southeasterly winds at 10 to 15 knots through tonight. Visibility should range from poor in snowers to good otherwise. Extended Area Outlook: For Sunday through Tuesday - Fair skies through period except for chance of rain on Tuesday. Highs should average in 80s, lows in 60s through period. Washington's normal temperature range for this time of year is from 79 to 60.

West Virginia: Today - Rain likely today, ending tonight, highs in mid 70s to mid 80s, lows in mid 50s to mid 60s. Saturday - Partly cloudy, highs in mid 70s to mid 80s.

The National Weather Forecast for Today - Scattered showers and thundersorms are likely over the northern and central Plateau and Rocky Mountain regions and from eastern Upper Michigan through eastern Louisiana and eastward to the Atlantic. Temperatures will be cool over the northern and central Rocky Mountain and Plateau regions. Seasonably warm conditions can be expected over the southeastern states. The remainder of the nation will be mostly cool.

ALMANAC DATA for Friday, Sept. 16, 1977: Sun rises 6:50 a.m., sets 7:15 p.m. moon rises 10:19 a.m., sets 9:20 p.m. Tides: High 9:44 a.m. and 10:09 p.m., to 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. Annapolis (3 1/2); Bloody Point Lighthouse (4 1/2); Deale, Md (4 1/2); Colonial Beach (6); Norfolk (4 1/2); Virginia Beach (4 1/2); Solomons Island (6 1/2); Point Lookout (7).

Pollen count: 76 (note; 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 to 3 p.m. period was 13 for the pollutant, photochemical oxidants. Index values between 0 and 24 indicate good 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 near 2.6 feet today.

Washington data at 8 p.m. (EDI) yesterday: Highest temperature since 8 a.m. yesterday, 67 degrees at midnight. Lowest temperature since midnight, 62 degrees at 5:45 a.m. Excess of temperature since Sept. 1, 34 degrees. Excess of temperature since Jan. 1, 370 degrees. Record high temperature for today, 95 degrees in 1980. Record low temperature for today, 44 degrees in 1902. Relative humidity: Maximum, 75 per cent at 7 a.m.; Minimum, 68 per cent at 10 a.m. 24 hour precipitation, trace. Deficiency of precipitation since Sept. 1, 1.56 inches. Deficiency of precipitation since Jan. 1, 7.97 inches. Highest observed wind since 8 a.m. 9 miles per hour from the E.N.E, at 10 a.m. Peak gust since 8 a.m., 15 miles per hour from the N.E. at 1:39 p.m. Local Temp., Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 mi'nites(COLUMN)67(COLUMN)70 1 a.m.(COLUMN)66(COLUMN)68 2 a.m.(COLUMN)65(COLUMN)70 3 a.m.(COLUMN)65(COLUMN)68 4 a.m.(COLUMN)64(COLUMN)70 5 a.m.(COLUMN)63(COLUMN)73 6 a.m.(COLUMN)62(COLUMN)$72 7 a.m.(COLUMN)62(COLUMN)75 8 a.m.(COLUMN)63(COLUMN)73 9 a.m.(COLUMN)64(COLUMN)68 10 a.m.(COLUMN)64(COLUMN)63 11 a.m.(COLUMN)64(COLUMN)70 12 noon(COLUMN)65(COLUMN)70 1 p.m.(COLUMN)65(COLUMN)68 2 p.m.(COLUMN)65(COLUMN)68 3 p.m.(COLUMN)65(COLUMN)68 4 p.m.(COLUMN)65(COLUMN)70 5 p.m.(COLUMN)66(COLUMN)68 6 p.m.(COLUMN)66(COLUMN)68(END TABLE) Temperatures ending 8 a.m. (EDT) Yesterday(TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)71(COLUMN)45 Albuquerque(COLUMN)81(COLUMN)58 Amarillo(COLUMN)76(COLUMN)54 Anchorage(COLUMN)61(COLUMN)43 Ashevilles(COLUMN)82(COLUMN)66 Atlanta(COLUMN)85(COLUMN)67 Atlantic City(COLUMN)83(COLUMN)58 Austin(COLUMN)97(COLUMN)66 Baltimore(COLUMN)88(COLUMN)56 Billings(COLUMN)86(COLUMN)50 Birmingham(COLUMN)86(COLUMN)73 Bismarck(COLUMN)84(COLUMN)58 Boise(COLUMN)83(COLUMN)61 Boston(COLUMN)77(COLUMN)52 Brownsville(COLUMN)87(COLUMN)68 Buffalo(COLUMN)66(COLUMN)45 Burlington, Vt.(COLUMN)66(COLUMN)48 Casper(COLUMN)84(COLUMN)58 Charleston, S.C.(COLUMN)90(COLUMN)79 Ch'ston, W.Va.(COLUMN)77(COLUMN)63 Charlotte, N.C.(COLUMN)87(COLUMN)70 Cheyenne(COLUMN)75(COLUMN)47 Chicago(COLUMN)70(COLUMN)58 Cincinnati(COLUMN)70(COLUMN)61 Clevelands(COLUMN)66(COLUMN)50 Columbia, S.C.(COLUMN)90(COLUMN)69 Columbus, Ohio(COLUMN)73(COLUMN)58 Dal.-Ft. Worth(COLUMN)83(COLUMN)56 Dayton(COLUMN)74(COLUMN)58 Denver(COLUMN)81(COLUMN)54 Des Moines(COLUMN)75(COLUMN)56 Detroit(COLUMN)73(COLUMN)51 Duluth(COLUMN)68(COLUMN)47 El Paso(COLUMN)86(COLUMN)62 Fairbanks(COLUMN)48(COLUMN)45 Fargo(COLUMN)78(COLUMN)57 Flagstaff(COLUMN)73(COLUMN)40 Great Falls(COLUMN)86(COLUMN)50 Hartford(COLUMN)79(COLUMN)49 Helena(COLUMN)83(COLUMN)57 Honolulu(COLUMN)87(COLUMN)77 Houston(COLUMN)85(COLUMN)74 Indianapolis(COLUMN)75(COLUMN)6 Jackson, Miss.(COLUMN)84(COLUMN)71 Jacksonville(COLUMN)92(COLUMN)70 Juneau(COLUMN)53(COLUMN)44 Kansas City(COLUMN)68(COLUMN)57 Las Vegas(COLUMN)96(COLUMN)72 Litte Rock(COLUMN)77(COLUMN)64 Los Angeles(COLUMN)74(COLUMN)60 Louisville(COLUMN)70(COLUMN)65 Memphis(COLUMN)84(COLUMN)70 Miami Beach(COLUMN)87(COLUMN)77 Midland(COLUMN)83(COLUMN)60 Milwaukee(COLUMN)67(COLUMN)52 Mpls.-St. Paul(COLUMN)76(COLUMN)51 Nashville(COLUMN)78(COLUMN)68 New Orleans(COLUMN)85(COLUMN)71 New York(COLUMN)78(COLUMN)56 Norfolk(COLUMN)90(COLUMN)70 North Platte(COLUMN)79(COLUMN)43 Oklahoma City(COLUMN)72(COLUMN)59 Omaha(COLUMN)79(COLUMN)51 Orlando(COLUMN)93(COLUMN)75 Philadelphia(COLUMN)80(COLUMN)54 Phoenix(COLUMN)100(COLUMN)74 Pittsburgh(COLUMN)70(COLUMN)50 Portland, Me.(COLUMN)74(COLUMN)43 Portland, Ore.(COLUMN)68(COLUMN)55 Providence(COLUMN)77(COLUMN)53 Raleigh(COLUMN)88(COLUMN)65 Rapid City(COLUMN)90(COLUMN)57 Reno(COLUMN)81(COLUMN)40 Richmond(COLUMN)89(COLUMN)65 St. Louis(COLUMN)68(COLUMN)60 St. Pbg-Tampa(COLUMN)92(COLUMN)78 Salt Lake City(COLUMN)80(COLUMN)55 San Antonio(COLUMN)87(COLUMN)66 San Diego(COLUMN)75(COLUMN)69 San Francisco(COLUMN)65(COLUMN)58 San Juan, P.R.(COLUMN)85(COLUMN)73 St. Ste. Marie(COLUMN)64(COLUMN)41 Seattle(COLUMN)69(COLUMN)53 Shreveport(COLUMN)79(COLUMN)57 Sioux Falls(COLUMN)76(COLUMN)52 Spokane(COLUMN)74(COLUMN)46 Syracuse(COLUMN)67(COLUMN)44 Topeka(COLUMN)77(COLUMN)60 Tucson(COLUMN)91(COLUMN)70 Tulsa(COLUMN)66(COLUMN)66 Washington(COLUMN)79(COLUMN)62 Wichitas(COLUMN)70(COLUMN)59(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)52 Amsterdams(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)64 Ankara(COLUMN)pt. cldy(COLUMN)3 p.m.(COLUMN)70 Athens(COLUMN)clear(COLUMN)2 p.m.(COLUMN)84 Auckland(COLUMN)rain(COLUMN)midnight(COLUMN)57 Berlin(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)59 Birmingham(COLUMN)clear(COLUMN)1 p.m.(COLUMN)66 Brussels(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)63 Cairo(COLUMN)clear(COLUMN)2 p.m.(COLUMN)90 Casablanca(COLUMN)pt. cldy(COLUMN)noon(COLUMN)75 Copenhagen(COLUMN)clear(COLUMN)1 p.m.(COLUMN)57 Dublin(COLUMN)drizzle(COLUMN)1 p.m.(COLUMN)57 Geneva(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)64 Hong Kong(COLUMN)pt. cldy(COLUMN)8 p.m.(COLUMN)86 Lisbon(COLUMN)pt. cldy(COLUMN)noon(COLUMN)79 London(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)66 Madrid(COLUMN)clear(COLUMN)1 p.m.(COLUMN)79 Malta(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)79 Manila(COLUMN)rain(COLUMN)8 p.m.(COLUMN)81 Moscow(COLUMN)rain(COLUMN)3 p.m.(COLUMN)41 New Delhi(COLUMN)rain(COLUMN)5 p.m.(COLUMN)75 Nice(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)72 Oslo(COLUMN)clear(COLUMN)1 p.m.(COLUMN)57 Paris(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)65 Peking(COLUMN)rain(COLUMN)8 p.m.(COLUMN)61 Rome(COLUMN)clear(COLUMN)1 p.m.(COLUMN)79 Saigon(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)82 Sofia(COLUMN)clear(COLUMN)2 p.m.(COLUMN)68 Stockholm(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)48 Sydney(COLUMN)clear(COLUMN)10 p.m.(COLUMN)52 Tel Aviv(COLUMN)pt. cldy(COLUMN)2 p.m.(COLUMN)86 Tokyo(COLUMN)cloudy(COLUMN)9 p.m.(COLUMN)73 Tunis(COLUMN)clear(COLUMN)1 p.m.(COLUMN)82 Vienna(COLUMN)clear(COLUMN)1 p.m.(COLUMN)63 Warsaw(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)57(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)low Acapulco(COLUMN)pt. cldy(COLUMN)86(COLUMN)77 Berbados(COLUMN)cloudy(COLUMN)87(COLUMN)76 Bermuda(COLUMN)sunny(COLUMN)84(COLUMN)78 Bagota(COLUMN)pt. cldy(COLUMN)67(COLUMN)50 Gaigary(COLUMN)cloudy(COLUMN)52(COLUMN)36 Edmonton(COLUMN)rain(COLUMN)55(COLUMN)43 Havana(COLUMN)cloudy(COLUMN)92(COLUMN)76 Kingston(COLUMN)cloudy(COLUMN)88(COLUMN)78 Montego Bay(COLUMN)pt. cldy(COLUMN)88(COLUMN)76 Mexico City(COLUMN)cloudy(COLUMN)79(COLUMN)52 Monterrey(COLUMN)sunny(COLUMN)87(COLUMN)65 Nassau(COLUMN)pt. cldy(COLUMN)90(COLUMN)76 Ottawa(COLUMN)fog(COLUMN)61(COLUMN)41 Regina(COLUMN)pt. cldy(COLUMN)79(COLUMN)50 St. Klitts(COLUMN)pt. cldy(COLUMN)87(COLUMN)74 St. Thomas(COLUMN)pt. cldy(COLUMN)87(COLUMN)74 Toronto(COLUMN)cloudy(COLUMN)66(COLUMN)43 Vancouver(COLUMN)rain(COLUMN)63(COLUMN)52 Veracruz(COLUMN)cloudy(COLUMN)90(COLUMN)72 Winnipeg(COLUMN)clear(COLUMN)77(COLUMN)57(END TABLE)