Washington: Today - Mostly sunny, highs in low to mid 80s, lows in low to mid 60s. Chance of rain is near zero today, 10 per cent tonight. Sunday - Partly cloudy, high in low to mid 80s.

Maryland and Virginia: Today - Partly cloudy, highs in mid 70s to mid 80s, lows in mid 50s to mid 60s. Sunday - Partly cloudy with chance of rain, highs in mid 70s to mid 80s.

Lower Potomac and Chesapeake Bay: Today - Partly cloudy skies with fair visibility and variable but mostly southerly winds at about 15 knots through tonight.

Extended Area Outlook: For Monday through Wednesday - Partly cloudy skies through period with chance of rain Wednesday. Highs should average in 70s, lows in 50s through the period. Washington's normal temperature range for this time of year is from 77 to 58.

West Virginia: Today - Partly cloudy, highs in mid 70s to low 80s, lows in mid 50s to low 60s. There is a chance of rain tonight. Sunday - Rain, highs in mid 70s to mid 80s.

The National Weather Forecast for Today - Thunderstorms are likely over eastern Illinois and the tower Ohio Valley. Other scattered showers and thunderstorms will be found from the northern Plains through the Great Lakes area into the middle Atlantic states and in the lower Mississippi Valley. There will be a good chance of rain or showers in the Pacific northwest and northern intermountain region with scattered snow over the higher elevations. Skies will be mostly sunny over the central Plains and much of the southern half of the Nation. Cool temperatures will prevail from New England through the northern Great Lakes, the northern Plains and the northwest. It will be mild elsewhere except for warm readings across the southern tier of states.

Sun rises 6:27 a.m., sets 7:02 p.m.; Moon rises 5:28 p.m., sets 4:04 a.m. Tides: High 6:23 a.m. and 7:00 p.m., low 1:06 p.m. and high and low tides at the following locations can be obtained by subtracting the hours indicated from the tides above Annapolis (1 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 32. Ragweed (note: More than 7 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 41 for the pollutant photochemical oxidants. Index values between 25 and 49 indicate fair 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 Litte Falls should remain near 2.6 feet through today.

Washington data at 8 p.m. (EDT) yesterday: Highest temperature since 8 a.m. yesterday, 79 degrees at 3:47 p.m. Lowest temperature since midnight, 67 degrees at 2:35 a.m. Excess at temperature since Sept. 1, 76 degrees. Excess temperature since Jan. 1, 412 degrees. Record high temperature for today, 94 degrees in 1970. Record low temperature for today, 39 degrees in 1963. Relative humidity: Maximum, 93 per cent at 4 a.m.; Minimum, 60 per cent at 4 p.m 24 hour precipitation, none inches. Deficiency of precipitation since Sept. 1, 2.20 inches. Deficiency of precipitation since Jan. 1, 8.61 inches.Highest observed wind since 8 a.m. 14 miles per hour from the south at 12:53 p.m. Peak gust since 8 a.m., 17 miles per hour from the S.W. at 2:35 p.m. Local Temp., Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 m'nite(COLUMN)68(COLUMN)84 1 a.m.(COLUMN)68(COLUMN)87 2 a.m.(COLUMN)68(COLUMN)87 3 a.m.(COLUMN)67(COLUMN)90 4 a.m.(COLUMN)67(COLUMN)93 5 a.m.(COLUMN)67(COLUMN)93 6 a.m.(COLUMN)68(COLUMN)90 7 a.m.(COLUMN)67(COLUMN)93 8 a.m.(COLUMN)68(COLUMN)93 9 a.m.(COLUMN)69(COLUMN)90 10 a.m.(COLUMN)69(COLUMN)90 11 a.m.(COLUMN)71(COLUMN)84 12 noon(COLUMN)75(COLUMN)71 1 p.m.(COLUMN)77(COLUMN)64 2 p.m.(COLUMN)77(COLUMN)64 2 p.m.(COLUMN)76(COLUMN)64 3 p.m.(COLUMN)77(COLUMN)64 4 p.m.(COLUMN)79(COLUMN)60 5 p.m.(COLUMN)77(COLUMN)64 6 p.m.(COLUMN)76(COLUMN)69(END TABLE) Temperatures ending 9 a.m. (EST) yesterday:(TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)55(COLUMN)51 Albuguerque(COLUMN)79(COLUMN)58 Amarillo(COLUMN)95(COLUMN)65 Anchorage(COLUMN)58(COLUMN)38 Asheville(COLUMN)79(COLUMN)58 Atlanta(COLUMN)82(COLUMN)62 Atlantic City(COLUMN)64(COLUMN)64 Austin(COLUMN)92(COLUMN)77 Baltimore(COLUMN)70(COLUMN)58 Billings(COLUMN)61(COLUMN)47 Birmingham(COLUMN)84(COLUMN)62 Bismarck(COLUMN)66(COLUMN)51 Boise(COLUMN)59(COLUMN)39 Boston(COLUMN)58(COLUMN)50 Brownsville(COLUMN)94(COLUMN)74 Buffalo(COLUMN)58(COLUMN)50 Burlington, Vt.(COLUMN)55(COLUMN)51 Casper(COLUMN)68(COLUMN)40 Ch'leston, S.C.(COLUMN)83(COLUMN)68 Ch'lston, W.Va.(COLUMN)75(COLUMN)55 Charlotte, N.C.(COLUMN)78(COLUMN)59 Cheyenne(COLUMN)71(COLUMN)49 Chicago(COLUMN)71(COLUMN)63 Cincinnati(COLUMN)76(COLUMN)58 Cleveland(COLUMN)71(COLUMN)58 Columbia, S.C.(COLUMN)85(COLUMN)55 Columbus, Ohio(COLUMN)73(COLUMN)60 Dal.-Ft. Worth(COLUMN)93(COLUMN)73 Dayton(COLUMN)74(COLUMN)56 Denver(COLUMN)80(COLUMN)53 Des Moines(COLUMN)74(COLUMN)59 Detroit(COLUMN)60(COLUMN)58 Duluth(COLUMN)50(COLUMN)49 El Paso(COLUMN)91(COLUMN)67 Fairbanks(COLUMN)42(COLUMN)34 Fargo(COLUMN)57(COLUMN)54 Flagstaff(COLUMN)70(COLUMN)46 Great Falls(COLUMN)61(COLUMN)39 Helena(COLUMN)58(COLUMN)33 Honolulu(COLUMN)89(COLUMN)77 Houston(COLUMN)89(COLUMN)78 Indianapolis(COLUMN)80(COLUMN)58 Jackson, Miss.(COLUMN)88(COLUMN)66 Jacksonville(COLUMN)93(COLUMN)70 Juneau(COLUMN)52(COLUMN)44 Kansas City(COLUMN)80(COLUMN)67 Las Vegas(COLUMN)88(COLUMN)64 Little Rock(COLUMN)88(COLUMN)69 Los Angeles(COLUMN)78(COLUMN)63 Louisville(COLUMN)81(COLUMN)60 Memphis(COLUMN)89(COLUMN)68 Miami Beach(COLUMN)87(COLUMN)82 Midland(COLUMN)100(COLUMN)67 Milwavkee(COLUMN)64(COLUMN)59 Mpls.-St. Paul(COLUMN)60(COLUMN)56 Nashville(COLUMN)85(COLUMN)60 New Orleans(COLUMN)89(COLUMN)69 New York(COLUMN)56(COLUMN)53 Norfolk(COLUMN)77(COLUMN)61 North Platte(COLUMN)79(COLUMN)57 Oklahoma City(COLUMN)93(COLUMN)70 Omaha(COLUMN)74(COLUMN)58 Orlando(COLUMN)91(COLUMN)72 Philadelphia(COLUMN)62(COLUMN)58 Phoenix(COLUMN)89(COLUMN)74 Pittsburgh(COLUMN)63(COLUMN)53 Portland, Me.(COLUMN)61(COLUMN)38 Portland, Ore.(COLUMN)64(COLUMN)53 Providence(COLUMN)61(COLUMN)53 Raleigh(COLUMN)79(COLUMN)53 Rapid City(COLUMN)73(COLUMN)51 Reno(COLUMN)72(COLUMN)31 Richmond(COLUMN)78(COLUMN)54 St. Louuis(COLUMN)84(COLUMN)63 St. Prbg-Tampa(COLUMN)90(COLUMN)72 Salt Lake City(COLUMN)63(COLUMN)41 San Antonio(COLUMN)91(COLUMN)76 San Diego(COLUMN)73(COLUMN)65 San Francisco(COLUMN)70(COLUMN)56 San Juan, P. R.(COLUMN)83(COLUMN)73 St. Ste. Maries(COLUMN)56(COLUMN)50 Seattle(COLUMN)61(COLUMN)53 Shreveport(COLUMN)90(COLUMN)65 Sioux Falls(COLUMN)65(COLUMN)52 Spokane(COLUMN)59(COLUMN)37 Syracuse(COLUMN)57(COLUMN)52 Topeka(COLUMN)85(COLUMN)71 Tucson(COLUMN)89(COLUMN)68 Tulsa(COLUMN)89(COLUMN)70 Washington(COLUMN)75(COLUMN)67 Wichita(COLUMN)82(COLUMN)72(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN) 50 Amsterdam(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN) 63 Ankara(COLUMN)clear(COLUMN)3 p.m.(COLUMN) 79 Athens(COLUMN)pt.cldy(COLUMN)2 p.m.(COLUMN) 82 Auckland(COLUMN)rain(COLUMN)mid.(COLUMN)54 Berlin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)57 Birmingham(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)55 Brussels(COLUMN)clear(COLUMN)1 p.m.(COLUMN)63 Cairo(COLUMN)clear(COLUMN)2 p.m.(COLUMN)93 Casablanca(COLUMN)clear(COLUMN)noon(COLUMN)72 Copenhagen(COLUMN)clear(COLUMN)1 p.m.(COLUMN)63 Dublin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)57 Geneva(COLUMN)clear(COLUMN)1 p.m.(COLUMN)55 Hong Kong(COLUMN)pt.cldy(COLUMN)8 p.m.(COLUMN)81 Lisbon(COLUMN)pt.cldy(COLUMN)noon(COLUMN)104 London(COLUMN)pt.cldy(COLUMN)1 p.m.(COLUMN)63 Madrid(COLUMN)pt. cldy(COLUMN)8 p.m.(COLUMN)79 Malta(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)77 Manila(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)79 Moscow(COLUMN)cloudy(COLUMN)3 p.m.(COLUMN)39 New Delhi(COLUMN)clear(COLUMN)5 p.m.(COLUMN)91 Nice(COLUMN)clear(COLUMN)1 p.m.(COLUMN)68 Oslo(COLUMN)clear(COLUMN)1 p.m.(COLUMN)57 Paris(COLUMN)clear(COLUMN)1 p.m.(COLUMN)61 Peking(COLUMN)clear(COLUMN)8 p.m.(COLUMN)63 Rome(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)66 Saigon(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)82 Sofia(COLUMN)rain(COLUMN)2 p.m.(COLUMN)59 Stockholm(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)50 Sydney(COLUMN)clear(COLUMN)10 p.m.(COLUMN)64 Tel Aviv(COLUMN)clear(COLUMN)2 p.m.(COLUMN)86 Hong Kong(COLUMN)pt. cloudy(COLUMN)8 p.m.(COLUMN)81 Tunis(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)75 Vienna(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)55 Warsaw(COLUMN)rain(COLUMN)1 p.m.(COLUMN)50(END TABLE) (TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)cloudy(COLUMN)91(COLUMN)77 Barbados(COLUMN)pt. cldy(COLUMN)87(COLUMN)81 Bermuda(COLUMN)cloudy(COLUMN)86(COLUMN)76 Bogota(COLUMN)pt. cldy(COLUMN)66(COLUMN)63 Calgary(COLUMN)clear(COLUMN)59(COLUMN)36 Culiacan(COLUMN)pt. cldy(COLUMN)100(COLUMN)77 Edmonton(COLUMN)clear(COLUMN)63(COLUMN)74 Havana(COLUMN)pt. cldy(COLUMN)91(COLUMN)77 Kingston(COLUMN)clear(COLUMN)88(COLUMN)79 Montego Bay(COLUMN)clear(COLUMN)89(COLUMN)72 Mexico City(COLUMN)clody(COLUMN)73(COLUMN)57 Monterrey(COLUMN)cloudy(COLUMN)91(COLUMN)72 Montreal(COLUMN)pt. cldy(COLUMN)55(COLUMN)45 Nassau(COLUMN)cloudy(COLUMN)83(COLUMN)73 Ottawa(COLUMN)cloudy(COLUMN)52(COLUMN)48 Regina(COLUMN)cloudy(COLUMN)68(COLUMN)48 St. Kitts(COLUMN)cloudy(COLUMN)83(COLUMN)76 Toronto(COLUMN)cloudy(COLUMN)55(COLUMN)50 Vancouver(COLUMN)rain(COLUMN)55(COLUMN)50 Veracruz(COLUMN)cloudy(COLUMN)86(COLUMN)73 Winnipeg(COLUMN)drizzle(COLUMN)55(COLUMN)54(END TABLE)