Washington: Today - Partly cloudy, rain possible in afternoon or evening, high in mid 70s, low in mid 50s. Chance of rain will be 40 percent today and 30 percent tonight. Wind will be from the southwest at from 10 to 15 mph. Friday - Sunny, high near 80.

Maryland and Virginia: Today - Partly cloudy, rain possible, highs from the mid 60s to the upper 70s, lows from the mid 40s to the mid 50s. Friday - Sunny, highs from the 70s to the low 80s.

Low Potomac and Chesapeake Bay: Today - partly cloudy, rain possible this evening or this afternoon. Visibilty will be more than 5 miles, except lower in rain. Wind will be variable but mainly from the south at less than 10 knots. Waves in unprotected waters will be near 1 foot.

Extended Area Forecast for Saturday through Monday: Fair on Saturday, partly cloudy with rain possible on Sunday and on Monday. Highs will be from the 70s to the mid 80s, lows from the 50s to the low 60s. Normal Washington temperatures for the period are a high of 78 and a low of 57.

The National Weather Forecast for today - Rain will reach from New England through the lower Great Lakes and northern Atlantic Coast into northern Virginia. Showers and thundershowers will extend from southern Atlantic Coast and Gulf Coast through the lower half of the Mississippi Valley across the plains from South Dakota into northern Texas, over the central half of the Rockies and into the upper Missouri Valley. Temperatures will be unseasonably warm over Florida, Southern Texas, the southern California Coast and the western end of the Great Lakes. It will be cool over the Northeast as well as from the lower Mississippi Valley across much of the Plains through the northern Intermountains and Great Basin. Temperatures will be generally mild elsewhere.

Almanac Data for today: The sun rises 5:53 a.m., sets 8:16 p.m.; moon rises 2:05 p.m., sets 1:55 a.m. Tides: high 5:11 a.m. and 5:33 p.m., low 12:16 p.m. and 12:26 a.m. High and low tides at the following locations may be obtained by subtracting the hours indicated from 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 2 p.m. to 3 p.m. period was 23 for the pollutant, photochemical oxidant. Index values between zero and 24 indicate good air quality. When the index exceeds 100 the air is considered very unhealthy and individuals with lung, heart and eye aliments are urged to restrict their activity. The forecast for today indicates that the air quality will be good.

The National Weather Service forecasts the Potomac River stage at Little Falls should be near 10 feet today. Local Temps., Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 night(COLUMN)56(COLUMN)93 1 a.m.(COLUMN)56(COLUMN)93 2 a.m.(COLUMN)57(COLUMN)90 3 a.m.(COLUMN)57(COLUMN)90 4 a.m.(COLUMN)57(COLUMN)93 5 a.m.(COLUMN)57(COLUMN)93 6 a.m.(COLUMN)57(COLUMN)93 7 a.m.(COLUMN)58(COLUMN)90 8 a.m.(COLUMN)58(COLUMN)93 9 a.m.(COLUMN)60(COLUMN)87 10 a.m.(COLUMN)63(COLUMN)81 11 a.m.(COLUMN)65(COLUMN)75 12 noon(COLUMN)67(COLUMN)73 1 p.m.(COLUMN)70(COLUMN)64 2 p.m.(COLUMN)71(COLUMN)61 3 p.m.(COLUMN)71(COLUMN)59 4 p.m.(COLUMN)70(COLUMN)57 5 p.m.(COLUMN)70(COLUMN)59 6 p.m.(COLUMN)67(COLUMN)68 7 p.m.(COLUMN)67(COLUMN)68(END TABLE) Temperatures ending 8 a.m. (EDT) yesterday:(TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)63(COLUMN)51 Albuquerque(COLUMN)86(COLUMN)48 Amarillo(COLUMN)83(COLUMN)59 Anchorage(COLUMN)53(COLUMN)41 Asheville(COLUMN)62(COLUMN)39 Atlanta(COLUMN)69(COLUMN)47 Atlantic City(COLUMN)53(COLUMN)51 Austin(COLUMN)91(COLUMN)74 Baltimore(COLUMN)58(COLUMN)54 Billings(COLUMN)55(COLUMN)44 Birmingham(COLUMN)70(COLUMN)55 Bismarck(COLUMN)77(COLUMN)54 Boise(COLUMN)60(COLUMN)38 Boston(COLUMN)53(COLUMN)51 Brownsville(COLUMN)92(COLUMN)79 Buffalo(COLUMN)61(COLUMN)53 Burlington(COLUMN)71(COLUMN)53 Casper(COLUMN)68(COLUMN)40 Charleston, S.C.(COLUMN)75(COLUMN)64 Ch'leston, W.V.(COLUMN)61(COLUMN)47 Charlotte(COLUMN)68(COLUMN)47 Cheyenne(COLUMN)78(COLUMN)52 Chicago(COLUMN)60(COLUMN)46 Cincinnati(COLUMN)59(COLUMN)43 Cleveland(COLUMN)67(COLUMN)50 Columbia, S.C.(COLUMN)71(COLUMN)50 Columbus, Ohio(COLUMN)62(COLUMN)46 Dal.-Ft. Worth(COLUMN)82(COLUMN)67 Dayton(COLUMN)61(COLUMN)47 Denver(COLUMN)84(COLUMN)60 Des Moines(COLUMN)68(COLUMN)57 Detroit(COLUMN)66(COLUMN)49 Duluth(COLUMN)72(COLUMN)47 El Paso(COLUMN)95(COLUMN)70 Fairbanks(COLUMN)58(COLUMN)37 Fargo(COLUMN)77(COLUMN)55 Flagstaff(COLUMN)66(COLUMN)27 Great Falls(COLUMN)60(COLUMN)44 Hartford(COLUMN)54(COLUMN)49 Helena(COLUMN)61(COLUMN)46 Honolulu(COLUMN)88(COLUMN)72 Houston(COLUMN)89(COLUMN)74 Indianapolis(COLUMN)68(COLUMN)52 Jackson, Miss.(COLUMN)78(COLUMN)58 Jacksonville(COLUMN)67(COLUMN)61 Juneau(COLUMN)53(COLUMN)40 Kansas City(COLUMN)65(COLUMN)50 Las Vegas(COLUMN)77(COLUMN)55 Little Rock(COLUMN)70(COLUMN)54 Los Angeles(COLUMN)80(COLUMN)61 Louisville(COLUMN)61(COLUMN)49 Memphis(COLUMN)79(COLUMN)54 Miami Beach(COLUMN)82(COLUMN)76 Midland-Odessa(COLUMN)96(COLUMN)63 Milwaukee(COLUMN)56(COLUMN)46 Mpls.-St. Paul(COLUMN)75(COLUMN)51 Nashville(COLUMN)69(COLUMN)47 New Orleans(COLUMN)88(COLUMN)68 New York(COLUMN)54(COLUMN)50 Norfolk(COLUMN)66(COLUMN)57 North Platte(COLUMN)71(COLUMN)51 Oklahoma City(COLUMN)80(COLUMN)61 Omaha(COLUMN)69(COLUMN)52 Orlando(COLUMN)92(COLUMN)65 Philadelphia(COLUMN)55(COLUMN)54 Phoenix(COLUMN)91(COLUMN)64 Pittsburgh(COLUMN)66(COLUMN)54 Portland, Me.(COLUMN)50(COLUMN)48 Portland, Ore.(COLUMN)63(COLUMN)43 Providence(COLUMN)50(COLUMN)49 Raleigh(COLUMN)68(COLUMN)47 Rapid City(COLUMN)70(COLUMN)53 Reno(COLUMN)60(COLUMN)26 Richmond(COLUMN)68(COLUMN)54 St. Louis(COLUMN)66(COLUMN)51 St. Pbg.-Tampa(COLUMN)87(COLUMN)71 Salt Lake City(COLUMN)49(COLUMN)42 San Antonio(COLUMN)90(COLUMN)75 San Diego(COLUMN)74(COLUMN)61 San Francisco(COLUMN)69(COLUMN)60 San Juan(COLUMN)87(COLUMN)75 St. Ste Marie(COLUMN)73(COLUMN)46 Seattle(COLUMN)63(COLUMN)49 Shreveport(COLUMN)82(COLUMN)65 Sioux Falls(COLUMN)70(COLUMN)44 Spokane(COLUMN)52(COLUMN)45 Syracuse(COLUMN)67(COLUMN)51 Topeka(COLUMN)72(COLUMN)51 Tucson(COLUMN)92(COLUMN)62 Tulsa(COLUMN)78(COLUMN)56 Washington(COLUMN)61(COLUMN)55 Wichita(COLUMN)77(COLUMN)55(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)59 Amsterdam(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)57 Ankara(COLUMN)pt. cldy(COLUMN) 3 p.m.(COLUMN)68 Athens(COLUMN)clear(COLUMN) 2 p.m.(COLUMN)79 Auckland(COLUMN)pt. cldy(COLUMN)midnight(COLUMN)55 Berlin(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)61 Birmingham(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN)63 Brussels(COLUMN)pt. cldy(COLUMN) 1 p.m.(COLUMN)59 Casablanca(COLUMN)pt. cldy(COLUMN)noon(COLUMN)56 Copenhagen(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN)59 Dublin(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)55 Geneva(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN)59 Hong Kong(COLUMN)cloudy(COLUMN) 8 p.m.(COLUMN)77 Jerusalem(COLUMN)clear(COLUMN) 2 p.m.(COLUMN)88 Lisbon(COLUMN)cloudy(COLUMN)noon(COLUMN)64 London(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)57 Madrid(COLUMN)pt. cldy(COLUMN) 1 p.m.(COLUMN)68 Malta(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)70 Manila(COLUMN)clear(COLUMN) 8 p.m.(COLUMN)38 Moscow(COLUMN)pt. cldy(COLUMN) 3 p.m.(COLUMN)68 New Delhi(COLUMN)clear(COLUMN) 5 p.m.(COLUMN)108 Nice(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN)63 Oslo(COLUMN)rain(COLUMN) 1 p.m.(COLUMN)54 Paris(COLUMN)pt. cldy(COLUMN) 1 p.m.(COLUMN)61 Peking(COLUMN)rain(COLUMN) 8 p.m.(COLUMN)77 Rome(COLUMN)pt. cldy(COLUMN) 1 p.m.(COLUMN)68 Saigon(COLUMN)cloudy(COLUMN) 8 p.m.(COLUMN)82 Sofia(COLUMN)clear(COLUMN) 2 p.m.(COLUMN)64 Stockholm(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN)46 Sydney(COLUMN)cloudy(COLUMN)10 p.m.(COLUMN)61 Tokyo(COLUMN)cloudy(COLUMN) 9 p.m.(COLUMN)61 Tunis(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)81 Vienna(COLUMN)pt. cldy(COLUMN) 1 p.m.(COLUMN)64 Warsaw(COLUMN)pt. cldy(COLUMN) 1 p.m.(COLUMN)63(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)fair(COLUMN)90(COLUMN)75 Barbados(COLUMN)fair(COLUMN)88(COLUMN)77 Bermuda(COLUMN)pt. cldy(COLUMN)77(COLUMN)72 Calgary(COLUMN)pt. cldy(COLUMN)48(COLUMN)37 Culiacan(COLUMN)fair(COLUMN)93(COLUMN)72 Edmonton(COLUMN)clear(COLUMN)54(COLUMN)37 Havana(COLUMN)rain(COLUMN)90(COLUMN)77 Kingston(COLUMN)fair(COLUMN)93(COLUMN)79 Montego Bay(COLUMN)fair(COLUMN)90(COLUMN)72 Mexico City(COLUMN)pt. cldy(COLUMN)79(COLUMN)61 Monterrey(COLUMN)fair(COLUMN)104(COLUMN)66 Montreal(COLUMN)rain(COLUMN)73(COLUMN)54 Nassau(COLUMN)rain(COLUMN)89(COLUMN)71 Ottawa(COLUMN)cloudy(COLUMN)70(COLUMN)54 Regina(COLUMN)cloudy(COLUMN)77(COLUMN)50 St. Kitts(COLUMN)pt. cldy(COLUMN)89(COLUMN)75 Toronto(COLUMN)rain(COLUMN)63(COLUMN)52 Vancouver(COLUMN)pt. cldy(COLUMN)64(COLUMN)52 Veracruz(COLUMN)fair(COLUMN)93(COLUMN)72 Winnipeg(COLUMN)clear(COLUMN)(COLUMN)75(END TABLE)