Washington: Today - Partly cloudy, high near 80, low in the mid 40s. The chance of rain is 10 per cent. Friday - Variably cloudy, high in the mid 60s.

Maryland and Virginia: Today - Partly cloudy, highs from the mid 70s to the low 80s, lows in the 40s. There is a chance of rain in northern Maryland. Friday - Variably cloudy, high in the 60s.

West Virginia: Today - Cloudy, chance of rain by tonight, highs from the 60s to the low 70s, lows from the upper 30s to the mid 40s. Friday - Rain ending, highs from the 50s to the upper 60s.

Lower Potomac and Chesapeake Bay: Today - Partly cloudy, wind from the southwest at less than 22 knots today, shifting to the west at less than 20 knots tonight. Waves in unprotected waters will be near 3 feet.

Extended Area Forecast for Saturday through Monday: Fair through the period. Highs will be in the 60s, lows in the 40s. Normal Washington temperatures for the period are a high of 72 and a low of 51.

The National Weather Forecast for today - Showers and a few thundershowers will fall from the northern Atlantic Coast across the Great Lakes and the Ohio River Valley. Elsewhere, fair or partly cloudy skies are forecast. It will be much cooler from the northern and central Plains across the upper half of the Mississippi Valley and the Great Lakes. Warmer weather will move into the southern and central Atlantic Coast as well as over the Southeast. Little temperature change is forecast elsewhere.

Almanac Data for Today - Sunrises 5:14 a.m., sets 6:57 p.m.; moon rises 1:42 p.m., sets 2:03 a.m. Tides: High 2:59 a.m. and 3:24 p.m., low 10:03 a.m. and 10:25 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 (1 1/2); Virginia Beach (1); Solomons Island (6 1/2); Point Lookout (7).

The Council of Governments' Air Quality Index for yesterday showed the high reading in the Washington area during the 2 p.m. to 3 p.m. period was 33 for the pollutant, photochemical oxidants. Index values between 25 and 49 indicate fair air quality. When the index exceeds 100 the air becoems hazardous and persons with lung, heatt and eye problems should restrict their activity. The forecast for today indicates the air quality will imrpove.

The National Weather Service forecasts that the Potomac River stage at Little Falls will be near 3.7 feet.

Washington data at 7 p.m. (EST) yesterday: Highest temperature since 7 a.m. yesterday, 70 degrees at 5:10 p.m. Lowest temperature since midnight, 47 degrees at 4:25 a.m. Excess of temperature since midnight, 47 degrees at 4:25 a.m. Excess of temperature since Jan. 1, 107 degrees. Record high temperature for today, 92 degrees in 1957.Record low temperature for today, 23 degrees in 1898. Relative humidity: Maximum, 77 per cent at 6 a.m.; Minimum, 33 per cent at 5 p.m. Local Temp., Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 mid.(COLUMN)51(COLUMN)61 1 a.m.(COLUMN)49(COLUMN)68 2 a.m.(COLUMN)49(COLUMN)68 3 a.m.(COLUMN)49(COLUMN)68 4 a.m.(COLUMN)48(COLUMN)71 5 a.m.(COLUMN)47(COLUMN)73 6 a.m.(COLUMN)47(COLUMN)77 7 a.m.(COLUMN)47(COLUMN)77 8 a.m.(COLUMN)49(COLUMN)74 9 a.m.(COLUMN)53(COLUMN)66 10 a.m.(COLUMN)56(COLUMN)62 11 a.m.(COLUMN)59(COLUMN)53 12 noon(COLUMN)61(COLUMN)48 1 p.m.(COLUMN)64(COLUMN)43 2 p.m.(COLUMN)64(COLUMN)43 3 p.m.(COLUMN)67(COLUMN)39 4 p.m.(COLUMN)68(COLUMN)37 5 p.m.(COLUMN)68(COLUMN)33 6 p.m.(COLUMN)68(COLUMN)33 7 p.m.(COLUMN)67(COLUMN)33(END TABLE) Temperatures ending 8 a.m. (EDT) yesterday(TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)49(COLUMN)36 Albuquerque(COLUMN)76(COLUMN)50 Amarillo(COLUMN)74(COLUMN)52 Anchorage(COLUMN)43(COLUMN)33 Asheville(COLUMN)54(COLUMN)30 Atlanta(COLUMN)63(COLUMN)40 Atantic City(COLUMN)51(COLUMN)41 Austin(COLUMN)79(COLUMN)57 Baltimore(COLUMN)65(COLUMN)41 Billings(COLUMN)84(COLUMN)50 Birmingham(COLUMN)67(COLUMN)41 Bismarck(COLUMN)83(COLUMN)40 Boise(COLUMN)67(COLUMN)35 Boston(COLUMN)54(COLUMN)46 Brownsville(COLUMN)83(COLUMN)67 Buffalo(COLUMN)51(COLUMN)36 Burington(COLUMN)56(COLUMN)43 Casper(COLUMN)79(COLUMN)47 Charleston, S.C.(COLUMN)71(COLUMN)50 Ch'rist'n, W.Va.(COLUMN)51(COLUMN)33 Charlotte(COLUMN)60(COLUMN)38 Cheyenne(COLUMN)70(COLUMN)46 Chicago(COLUMN)50(COLUMN)51 Cincinnati(COLUMN)62(COLUMN)36 Cleveland(COLUMN)57(COLUMN)34 Columbia, S.C.(COLUMN)68(COLUMN)38 Columbus(COLUMN)58(COLUMN)34 Dal-Ft. Worth(COLUMN)79(COLUMN)56 Dayton(COLUMN)61(COLUMN)36 Denver(COLUMN)76(COLUMN)50 Des Molnes(COLUMN)79(COLUMN)54 Detroit(COLUMN)62(COLUMN)36 Duluth$73(COLUMN)50 El Paso(COLUMN)81(COLUMN)53 Fairbanks(COLUMN)31(COLUMN)26 Fargo(COLUMN)78(COLUMN)52 Flagstaff(COLUMN)73(COLUMN)36 Great Falls(COLUMN)76(COLUMN)39 Hartford(COLUMN)58(COLUMN)47 Helena(COLUMN)72(COLUMN)39 Honolulu(COLUMN)85(COLUMN)74 Houston(COLUMN)84(COLUMN)65 Indianpolis(COLUMN)68(COLUMN)39 Jackson, Miss.(COLUMN)72(COLUMN)41 Jacksonville(COLUMN)74(COLUMN)42 Juneau(COLUMN)62(COLUMN)46 Kansas City(COLUMN)74(COLUMN)52 Las Vegas(COLUMN)94(COLUMN)63 Little Rock(COLUMN)70(COLUMN)49 Los Angeles(COLUMN)74(COLUMN)59 Louisville(COLUMN)66(COLUMN)50 Memphis(COLUMN)70(COLUMN)54 Miami Beach(COLUMN)84(COLUMN)62 Midland-Odessa(COLUMN)79(COLUMN)53 Millwaukee(COLUMN)57(COLUMN)45 Mpis-St Paul(COLUMN)76(COLUMN)66 Nashville(COLUMN)67(COLUMN)45 New Orleans(COLUMN)75(COLUMN)48 New York(COLUMN)51(COLUMN)46 Norfolk(COLUMN)68(COLUMN)48 North Platte(COLUMN)76(COLUMN)46 Oklahoma City(COLUMN)73(COLUMN)52 Omaha(COLUMN)80(COLUMN)52 Oralando(COLUMN)75(COLUMN)50 Philadelphia(COLUMN)60(COLUMN)44 Phoenix(COLUMN)99(COLUMN)72 Pittsburgh(COLUMN)48(COLUMN)31 Portland, Malne(COLUMN)50(COLUMN)42 Portland, Ore(COLUMN)67(COLUMN)44 Providence(COLUMN)51(COLUMN)40 Raleigh(COLUMN)62(COLUMN)35 Rapid City(COLUMN)78(COLUMN)46 Reno(COLUMN)70(COLUMN)35 Richmont(COLUMN)66(COLUMN)42 St Louis(COLUMN)71(COLUMN)53 Salt Lake City(COLUMN)80(COLUMN)55 San Antonio(COLUMN)79(COLUMN)60 San Diego(COLUMN)66(COLUMN)60 San Francisco(COLUMN)61(COLUMN)49 San Juan(COLUMN)90(COLUMN)72 St Ste Marie(COLUMN)65(COLUMN)40 Seattle(COLUMN)64(COLUMN)46 Shrevport(COLUMN)74(COLUMN)46 Sioux Falls(COLUMN)76(COLUMN)43 Spokane(COLUMN)64(COLUMN)39 Syracuse(COLUMN)56(COLUMN)34 Topeka(COLUMN)78(COLUMN)48 Tucson(COLUMN)90(COLUMN)68 Tulsa(COLUMN)74(COLUMN)48 Washington(COLUMN)62(COLUMN)47 Wichita(COLUMN)71(COLUMN)47(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)W.(COLUMN)T.(COLUMN)T. Aberdeen(COLUMN)rain(COLUMN)1 p.m.(COLUMN)48 Amsterdam(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)48 Ankara(COLUMN)Cloudy(COLUMN)3 p.m.(COLUMN)64 Athens(COLUMN)clear(COLUMN)2 p.m.(COLUMN)66 Berlin(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)55 Birmingham(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)52 Brussels(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)52 Cairo(COLUMN)clear(COLUMN)2 p.m.(COLUMN)77 Casablanca(COLUMN)cloudy(COLUMN) noon(COLUMN)70 [WORD ILLEGIBLE] (COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)52 Dublin(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)48 Geneva(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)59 Hong Kong(COLUMN)pt. cldy(COLUMN)6 p.m.(COLUMN)81 Lisbon(COLUMN)cloudy(COLUMN)noon(COLUMN)48 London(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)53 Madrid(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)70 Malta(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)52 Manila(COLUMN)clear(COLUMN)8 p.m.(COLUMN)84 Moscow(COLUMN)cloudy(COLUMN)3 p.m.(COLUMN)54 New Delhi(COLUMN)clear(COLUMN)5 p.m.(COLUMN)102 Nice(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)63 Oslo(COLUMN)rain(COLUMN)1 p.m.(COLUMN)43 Paris(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)55 Peking(COLUMN)clear(COLUMN)8 p.m.(COLUMN)61 Rome(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)66 Saigon(COLUMN)clear(COLUMN)8 p.m.(COLUMN)84 Sofia(COLUMN)clear(COLUMN)2 p.m.(COLUMN)57 Stockholm(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)45 Sydney(COLUMN)clear(COLUMN)10 p.m.(COLUMN)54 Tel Aviv(COLUMN)clear(COLUMN)2 p.m.(COLUMN)75 Tokyo(COLUMN)rain(COLUMN)9 p.m.(COLUMN)63 Tunis(COLUMN)clear(COLUMN)1 p.m.(COLUMN)73 Vienna(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)72 Warsaw(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)61(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)W.(COLUMN)H.(COLUMN)L. Acapulco(COLUMN)pt. sunny(COLUMN)90(COLUMN)73 Barbados(COLUMN)pt. sunny(COLUMN)82(COLUMN)73 Dermuca(COLUMN)showers(COLUMN)73(COLUMN)69 Calgary(COLUMN)pt. cldy.(COLUMN)77(COLUMN)41 Culiacan(COLUMN)sunny(COLUMN)91(COLUMN)62 Edmonton(COLUMN)clear(COLUMN)57(COLUMN)36 Havanda(COLUMN)cloudy(COLUMN)81(COLUMN)68 Kingston(COLUMN)pt. sunny(COLUMN)86(COLUMN)77 Montego Bay(COLUMN)pt. cldy.(COLUMN)86(COLUMN)72 Mexico City(COLUMN)cloudy(COLUMN)77(COLUMN)50 Monterrey(COLUMN)pt. sunny(COLUMN)77(COLUMN)57 Montreal(COLUMN)clear(COLUMN)- (COLUMN)- Nassau(COLUMN)pt. sunny(COLUMN)82 (COLUMN)- Ottawa(COLUMN)clear(COLUMN)- (COLUMN)- Regina(COLUMN)cloudy(COLUMN)82(COLUMN)- St. Kitts(COLUMN)sunny(COLUMN)85(COLUMN)- St. Thomas(COLUMN)sunny(COLUMN)85(COLUMN)- Toronto(COLUMN)pt. cldy.(COLUMN)52(COLUMN)- Vancouver(COLUMN)pt. cldy.(COLUMN)61(COLUMN)43 Veracruz(COLUMN)cloudy(COLUMN)- (COLUMN)71 Winnipeg(COLUMN)cloudy(COLUMN)84(COLUMN)41(END TABLE)