Washington; Today - Gradual clearing and cool, high near 60, lows in the mid 40s. The chance of rain is 10 percent through tonight. Winds will become northerly at near 10 mph. Thursday - Partly cloudy, highs in the mid 60s.

Maryland and Virginia: Today - Gradual clearing with highs from the 50s to the mid 60s, lows in the 40s, in the 30s in the west.Thursday - Partly cloudy, high in the 60s.

West Virginia: Today - Clearing, high in the 50s, low in the 30s. Thursday - Mostly sunny, highs from the upper 50s to the mid 60s.

Extended Area Forecast for Friday through Sunday - Fair weather and above normal temperatures through the period. Highs will range from the upper 60s to mid 70s, low's in the 40s.Normal Washington temperatures are a high of 60 and a low of 41.

Lower Potomac and Chesapeake Bay - Clearing with visibility of 5 miles or more except less than 1 mile in morning fog and haze. Winds will become variable at near 10 knots. Waves will average near 1 foot.

The National Weather Forecast for today - Showers will extend from the Pacific Northwest across the northern Plateau and the northern Rockies into Montana, with snow showers likely in the higher elevations of the Rockies. Scattered showers will range through the south and middle Atlantic Coast states. Skies will be mostly sunny from the south Pacific Coast region across the southern and central Rockies through most of the Great Plains, and from the lower Mississippi Valley through the Ohio Valley and the lower Great Lakes to the Atlantic from the New England to Maryland. Temperatures will be cool from the southern Plains across the lower Mississippi Valley and the lower Great Lakes to the East Coast from New England to the Carolinas, and from the Pacific Northwest into the Great Basin and the northern Rockies. Most of the California coastal area will be warm, while mild temperatures will prevail across the remainder of the nation.

Almanac Data for today: The sun rises 6:43 a.m., sets 5:01 p.m.; moon rises 1:35 a.m. Tides: high 1:36 a.m. and 2:17 p.m. low 8:43 a.m. and 9:11 P.m. High and low tides at the following locations may be obtained by subtracting the hours indicated rom the hours above: Annapolis (3 1/4), Bloody Point Lighthouse (4 1/2), Deale, Md. (4 1/2), Colonial Beach (5 1/4), Norfolk (1), Virginia Beach (3/4), Solomons Island (6 1/4), Point Lookout (7).

The Council of Government's Air Quality Index for yesterday showed the high reading in the Washington area during the 3 p.m. period was 25 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 Little Falls should remain near 2.9 feet today.

Washington data for yesterday: Highest temperature since midnight yesterday, 72 degrees at 2:20 p.m. Lowest temperature since midnight, 50 degrees at 6:30 a.m. Excess of temperature since Nov. 1, 46 degrees. Excess of temperature since Jan. 1, 140 degrees. Record high temperature for today, 81 degrees in 1975. Record low temperature for today, 27 degrees in 1930. Relative humidity: maximum, 80 percent at 5 a.m.; minimum, 38 percent at 2 p.m. 24 hour precipitation, none. Deficiency of precipitation since Nov. 1, .61 inches. Deficiency of precipitation since Jan. 1, .31 inches. Highest observed wind since 7 a.m., 14 miles per hour from the north-northwest at 4:13 p.m. Peak gust since 7 a.m., 17 miles per hour from the northwest at 5:38 p.m. Local Temps., Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 midnight(COLUMN)59(COLUMN)69 1 a.m.(COLUMN)57(COLUMN)75 2 a.m.(COLUMN)55(COLUMN)75 3 a.m.(COLUMN)54(COLUMN)77 4 a.m.(COLUMN)52(COLUMN)77 5 a.m.(COLUMN)51(COLUMN)80 6 a.m.(COLUMN)51(COLUMN)80 7 a.m.(COLUMN)51(COLUMN)77 8 a.m.(COLUMN)54(COLUMN)72 9 a.m.(COLUMN)58(COLUMN)64 10 a.m.(COLUMN)61(COLUMN)60 11 a.m.(COLUMN)65(COLUMN)50 12 noon(COLUMN)67(COLUMN)45 1 p.m.(COLUMN)70(COLUMN)39 2 p.m.(COLUMN)71(COLUMN)38 3 p.m.(COLUMN)69(COLUMN)44 4 p.m.(COLUMN)70(COLUMN)41 5 p.m.(COLUMN)66(COLUMN)49 6 p.m.(COLUMN)64(COLUMN)56 7 p.m.(COLUMN)63(COLUMN)60(END TABLE) Temperatures ending 7 a.m. (EST) yesterday:(TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)69(COLUMN)48 Albuquerque(COLUMN)66(COLUMN)38 Amarillo(COLUMN)47(COLUMN)29 Anchorage(COLUMN)37(COLUMN)31 Asheville(COLUMN)75(COLUMN)38 Atlanta(COLUMN)76(COLUMN)50 Atlantic City(COLUMN)56(COLUMN)54 Austin(COLUMN)68(COLUMN)50 Baltimore(COLUMN)77(COLUMN)42 Billings(COLUMN)58(COLUMN)44 Birmingham(COLUMN)76(COLUMN)59 Bismarck(COLUMN)49(COLUMN)24 Boise(COLUMN)52(COLUMN)27 Boston(COLUMN)64(COLUMN)52 Brownsville(COLUMN)87(COLUMN)60 Buffalo(COLUMN)62(COLUMN)39 Burlington, Vt.(COLUMN)64(COLUMN)44 Casper(COLUMN)55(COLUMN)34 Charleston, S.C.(COLUMN)75(COLUMN)62 Charleston, W.Va.(COLUMN)73(COLUMN)50 Charlotte(COLUMN)79(COLUMN)48 Cheyenne(COLUMN)51(COLUMN)21 Chicago(COLUMN)47(COLUMN)35 Cincinnati(COLUMN)71(COLUMN)43 Cleveland(COLUMN)62(COLUMN)42 Columbia, S.C.(COLUMN)82(COLUMN)49 Columbus(COLUMN)70(COLUMN)45 Dal. Ft. Worth(COLUMN)65(COLUMN)46 Dayton(COLUMN)67(COLUMN)39 Denver(COLUMN)58(COLUMN)30 Des Moines(COLUMN)51(COLUMN)29 Detroit(COLUMN)63(COLUMN)38 Duluth(COLUMN)42(COLUMN)25 El Paso(COLUMN)69(COLUMN)45 Evansville(COLUMN)68(COLUMN)43 Fairbanks(COLUMN)19(COLUMN)13 Fargo(COLUMN)47(COLUMN)28 Flagstaff(COLUMN)63(COLUMN)24 Great Falls(COLUMN)55(COLUMN)49 Hartford(COLUMN)67(COLUMN)37 Helena(COLUMN)52(COLUMN)37 Honolulu(COLUMN)80(COLUMN)67 Houston(COLUMN)74(COLUMN)52 Indianapolis(COLUMN)58(COLUMN)40 Jackson(COLUMN)79(COLUMN)56 Jacksonville(COLUMN)78(COLUMN)53 Juneau(COLUMN)44(COLUMN)36 Kansas City(COLUMN)47(COLUMN)33 Las Vegas(COLUMN)79(COLUMN)50 Little Rock(COLUMN)70(COLUMN)44 Los Angeles(COLUMN)85(COLUMN)57 Louisville(COLUMN)72(COLUMN)45 Memphis(COLUMN)78(COLUMN)49 Miami Beach(COLUMN)79(COLUMN)75 Midland(COLUMN)56(COLUMN)36 Milwaukee(COLUMN)51(COLUMN)34 Mpls.-St. Paul(COLUMN)47(COLUMN)30 Nashville(COLUMN)75(COLUMN)49 New Orleans(COLUMN)84(COLUMN)64 New York(COLUMN)70(COLUMN)50 Norfolk(COLUMN)74(COLUMN)53 North Platte(COLUMN)53(COLUMN)22 Oklahoma City(COLUMN)60(COLUMN)32 Omaha(COLUMN)51(COLUMN)34 Orlando(COLUMN)83(COLUMN)60 Philadelphia(COLUMN)68(COLUMN)44 Phoenix(COLUMN)85(COLUMN)56 Pittsburgh(COLUMN)69(COLUMN)43 Portland, Me.(COLUMN)54(COLUMN)40 Portland, Ore.(COLUMN)59(COLUMN)40 Providence(COLUMN)62(COLUMN)46 Raleigh(COLUMN)80(COLUMN)49 Rapid City(COLUMN)45(COLUMN)32 Reno(COLUMN)64(COLUMN)28 Richmond(COLUMN)79(COLUMN)48 St. Louis(COLUMN)56(COLUMN)34 St. Prbg. Tampa(COLUMN)81(COLUMN)66 Salt Lake City(COLUMN)59(COLUMN)34 San Antonio(COLUMN)72(COLUMN)51 San Diego(COLUMN)74(COLUMN)59 San Francisco(COLUMN)76(COLUMN)58 San Juan(COLUMN)89(COLUMN)77 St. Ste. Marie(COLUMN)45(COLUMN)25 Seattle(COLUMN)56(COLUMN)51 Shreveport(COLUMN)71(COLUMN)52 Sioux Falls(COLUMN)51(COLUMN)37 Spokane(COLUMN)47(COLUMN)40 Syracuse(COLUMN)69(COLUMN)45 Topeka(COLUMN)49(COLUMN)26 Tucson(COLUMN)78(COLUMN)52 Tulsa(COLUMN)61(COLUMN)34 Washington(COLUMN)76(COLUMN)50 Wichita(COLUMN)51(COLUMN)29(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN)haze(COLUMN)1 p.m.(COLUMN)50 Amsterdam(COLUMN)clear(COLUMN)1 p.m.(COLUMN)48 Ankara(COLUMN)clear(COLUMN)3 p.m.(COLUMN)52 Athens(COLUMN)cloudy(COLUMN)2 p.m.(COLUMN)59 Auckland(COLUMN)clear(COLUMN)midnight(COLUMN)55 Berlin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)43 Birmingham(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)55 Bonn(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)43 Brussels(COLUMN)clear(COLUMN)1 p.m.(COLUMN)52 Casablanca(COLUMN)cloudy(COLUMN)noon(COLUMN)77 Copenhagen(COLUMN)cloudly(COLUMN)1 p.m.(COLUMN)52 Dublin(COLUMN)drizzle(COLUMN)1 p.m.(COLUMN)55 Geneva(COLUMN)cloudly(COLUMN)1 p.m.(COLUMN)43 Hong Kong(COLUMN)cloudy$8 p.m.(COLUMN)72 Jerusalem(COLUMN)clear(COLUMN)2 p.m.(COLUMN)66 Lisbon(COLUMN)cloudy(COLUMN)noon(COLUMN)61 London(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)59 Madrid(COLUMN)drizzle(COLUMN)1 p.m.(COLUMN)54 Malta(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)66 Manila(COLUMN)clear(COLUMN)8 p.m.(COLUMN)79 Moscow(COLUMN)rain(COLUMN)3 p.m.(COLUMN)28 New Delhi(COLUMN)clear(COLUMN)5 p.m.(COLUMN)82 Nice(COLUMN)clear(COLUMN)1 p.m.(COLUMN)63 Oslo(COLUMN)drizzle(COLUMN)1 p.m.(COLUMN)41 Paris(COLUMN)clear(COLUMN)1 p.m.(COLUMN)52 Peking(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)50 Rome(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)61 Saigon(COLUMN)pt. cldy.(COLUMN)8 p.m.(COLUMN)82 Sofia(COLUMN)clear(COLUMN)2 p.m.(COLUMN)43 Stockholm(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)43 Sydney(COLUMN)cloudy(COLUMN)10 p.m.(COLUMN)66 Tokyo(COLUMN)haze(COLUMN)9 p.m.(COLUMN)63 Tunis(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)66 Vienna(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)37 Warsaw(COLUMN)cloudy(COLUMN)1p.m.(COLUMN)50(END TABLE) Temperature (Wester Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)fair(COLUMN)33(COLUMN)77 Barbados(COLUMN)pt. cldy.(COLUMN)34(COLUMN)79 Bermuda(COLUMN)fair(COLUMN)82(COLUMN)74 Bogota(COLUMN)pt. cldy.(COLUMN)69(COLUMN)49 Calgary(COLUMN)cloudy(COLUMN)52(COLUMN)39 Edmonton(COLUMN)clear(COLUMN)48(COLUMN)39 Havana(COLUMN)rain(COLUMN)82(COLUMN)75 Kingston(COLUMN)fair(COLUMN)83(COLUMN)74 Montego Bay(COLUMN)cloudy(COLUMN)86(COLUMN)73 Mexico City(COLUMN)haze(COLUMN)79(COLUMN)50 Monterrey(COLUMN)pt. cldy.(COLUMN)81(COLUMN)57 Montreal(COLUMN)cloudy(COLUMN)61(COLUMN)41 Nassau(COLUMN)pt. cldy.(COLUMN)85(COLUMN)71 Ottawa(COLUMN)cloudy(COLUMN)61(COLUMN)39 Regina(COLUMN)cloudy(COLUMN)43(COLUMN)28 St. Kitts(COLUMN)pt. cldy.(COLUMN)85(COLUMN)74 Toronto(COLUMN)cloudy(COLUMN)59(COLUMN)39 Vancouver(COLUMN)cloudy(COLUMN)48(COLUMN)46 Vera Cruz(COLUMN)cloudy(COLUMN)85(COLUMN)69 Winnipeg(COLUMN)clear(COLUMN)46(COLUMN)30(END TABLE)