Washington: Today - Increasing cloudiness and warm, high 70 to 75, lows in the 50s. The chance of rain is 20 percent today, 60 percent tonight. Winds will be from the southwest at 10 to 20 mph. Friday - Occasional rain likely, high in the 60s.

Maryland and Virginia: Today - Increasing cloudiness, a chance of showers by afternoon, highs mainly 50s. Friday - Cooler with occasional rain, highs in the 60s.

Extended Area Forecast for Saturday through Monday - Partly cloudy and seasonably cool through the period. Highs will average from the mid 50s to the 60s, lows in the 40s, in the 30s in the mountains. Normal Washington temperatures are a high of 65 and a low of 45.

Lower Potomac and Chesapeake Bay - Increasing cloudiness with rain likely tonight. Visibility will be 5 miles or more, diminishing to 1 to 3 miles in rain. Winds will be southwesterly at 12 to 20 knots shifting to the northwest at near 15 knots by evening. Waves will average 2 to 3 feet.

West Virginia: Today - Cloudy with showers and possible thunder-showers, high in the 60s, low in the 40s. Friday - Light rain ending, highs from the upper 50s in the north to the 60s in the south.

The National Weather Forecast for today - Rainshowers and occasional thundershowers will be scattered from New England to Delaware, across the Appalachians, the lower and central Great Lakes, the Ohio Valley, the Tennessee Valley, Inland portions of the central Gulf States and northwest Texas. Temperatures will be mild from the Atlantic Coast states through the eastern Gulf states, warm over the southern California coast and generally coold elsewhere over the nation.

Almanac Data for today: The sun rise 7:26 a.m., sets 6:15 p.m.; moon rises 2:11 a.m., sets 3:34 a.m. Tides: high 4:13 a.m., and 4:40 p.m., low 11:20 a.m., and 11.43 p.m. High and low tides at the following locations may be obtained by subtracting that 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 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, 68 degrees at 3:15 p.m. Lowest temperature since midnight, 40 degrees at 7:11 a.m. Deficiency of temperature since Oct. 1, 28 degrees. Excess of temperature since Jan. 1, 67 degrees. Record high temperature for today, 82 degrees in 1920. Record low temperature for today, 28 degrees in 1879. Relative humidity: maximum, 79 percent at 6 a.m.; minimum, 40 percent at 2 p.m. 24 hour precipitation, none. Deficiency of precipitation since Oct. 1, 1.06 inches. Excess of precipitation since Jan. 1, .74 inches. Highest observed wind since 8 a.m., 16 miles per hour from the south at 11:53 a.m. Peak gusts since 8 a.m., 24 miles per hour from the south at 12:05 p.m. Local Temps., Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 midnite(COLUMN)45(COLUMN)60 1 a.m.(COLUMN)44(COLUMN)65 2 a.m.(COLUMN)46(COLUMN)65 3 a.m.(COLUMN)46(COLUMN)68 4 a.m.(COLUMN)44(COLUMN)73 5 a.m.(COLUMN)42(COLUMN)76 6 a.m.(COLUMN)41(COLUMN)79 7 a.m.(COLUMN)41(COLUMN)79 8 a.m.(COLUMN)42(COLUMN)79 9 a.m.(COLUMN)47(COLUMN)74 10 a.m.(COLUMN)51(COLUMN)66 11 a.m.(COLUMN)55(COLUMN)57 12 noon(COLUMN)59(COLUMN)50 1 p.m.(COLUMN)62(COLUMN)44 2 p.m.(COLUMN)65(COLUMN)40 3 p.m.(COLUMN)67(COLUMN)40 4 p.m.(COLUMN)68(COLUMN)40 5 p.m.(COLUMN)68(COLUMN)44 6 p.m.(COLUMN)66(COLUMN)40 7 p.m.(COLUMN)62(COLUMN)48(END TABLE) Temperatures ending 8 a.m. (EDT) yesterday(TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)49(COLUMN)38 Albuquerque(COLUMN)58(COLUMN)43 Amarillo(COLUMN)53(COLUMN)48 Anchorage(COLUMN)44(COLUMN)30 Asheville(COLUMN)73(COLUMN)39 Atlanta(COLUMN)79(COLUMN)58 Atlantic City(COLUMN)53(COLUMN)44 Austin(COLUMN)76(COLUMN)66 Baltimore(COLUMN)59(COLUMN)33 Billings(COLUMN)65(COLUMN)34 Birmingham(COLUMN)65(COLUMN)44 Bismarck(COLUMN)74(COLUMN)39 Boise(COLUMN)66(COLUMN)27 Boston(COLUMN)50(COLUMN)42 Brownsville(COLUMN)87(COLUMN)66 Buffalo(COLUMN)46(COLUMN)38 Burlington, Vt.(COLUMN)39(COLUMN)36 Casper(COLUMN)69(COLUMN)32 Charleston, S.C.(COLUMN)72(COLUMN)54 Charleston, W.V.(COLUMN)60(COLUMN)34 Charlotte(COLUMN)70(COLUMN)41 Cheyenne(COLUMN)60(COLUMN)31 Chicago(COLUMN)56(COLUMN)45 Cincinnati(COLUMN)57(COLUMN)36 Cleveland(COLUMN)51(COLUMN)34 Columbia, S.C.(COLUMN)77(COLUMN)44 Columbus(COLUMN)55(COLUMN)35 Dal.-Ft. Worth(COLUMN)74(COLUMN)62 Dayton(COLUMN)56(COLUMN)39 Denver(COLUMN)72(COLUMN)35 Des Moines(COLUMN)64(COLUMN)54 Detroit(COLUMN)52(COLUMN)38 Duluth(COLUMN)61(COLUMN)45 El Paso(COLUMN)58(COLUMN)44 Evansville(COLUMN)60(COLUMN)34 Fairbanks(COLUMN)31(COLUMN)14 Fargo(COLUMN)76(COLUMN)41 Flagstaff(COLUMN)45(COLUMN)38 Great Falls(COLUMN)64(COLUMN)25 Hartford(COLUMN)51(COLUMN)26 Helena(COLUMN)65(COLUMN)21 Honolulu(COLUMN)85(COLUMN)72 Houston(COLUMN)80(COLUMN)69 Indianapolis(COLUMN)58(COLUMN)38 Jackson(COLUMN)77(COLUMN)50 Jacksonville(COLUMN)81(COLUMN)65 Juneau(COLUMN)42(COLUMN)41 Kansas City(COLUMN)66(COLUMN)56 Las Vegas(COLUMN)80(COLUMN)58 Little Rock(COLUMN)67(COLUMN)55 Los Angeles(COLUMN)75(COLUMN)64 Louisville(COLUMN)60(COLUMN)35 Memphis(COLUMN)70(COLUMN)53 Miami Beach(COLUMN)79(COLUMN)78 Midland(COLUMN)50(COLUMN)47 Milwaukee(COLUMN)55(COLUMN)47 Mpls.-St. Paul(COLUMN)69(COLUMN)51 Nashville(COLUMN)64(COLUMN)36 New Orleans(COLUMN)81 56 New York(COLUMN)54(COLUMN)43 Norfolk(COLUMN)66(COLUMN)37 North Platte(COLUMN)70(COLUMN)40 Oklahoma City(COLUMN)67(COLUMN)57 Omaha(COLUMN)66(COLUMN)48 Orlando(COLUMN)87(COLUMN)62 Philadelphia(COLUMN)58(COLUMN)36 Phoenix(COLUMN)68(COLUMN)58 Pittsburgh(COLUMN)49(COLUMN)30 Portland, Me.(COLUMN)47(COLUMN)29 Portland, Ore.(COLUMN)61(COLUMN)35 Providence(COLUMN)51(COLUMN)39 Raleigh(COLUMN)66(COLUMN)40 Rapid City(COLUMN)84(COLUMN)38 Reno(COLUMN)77(COLUMN)32 Richmond(COLUMN)59(COLUMN)30 St. Louis(COLUMN)61(COLUMN)51 St. Prbg.-Tampa(COLUMN)84(COLUMN)63 Salt Lake City(COLUMN)68(COLUMN)38 San Antonio(COLUMN)69(COLUMN)59 San Diego(COLUMN)73(COLUMN)68 San Francisco(COLUMN)75(COLUMN)55 San Juan(COLUMN)85(COLUMN)73 St. Ste. Marie(COLUMN)50(COLUMN)38 Seattle(COLUMN)56(COLUMN)44 Shreveport(COLUMN)76(COLUMN)59 Sioux Falls(COLUMN)72(COLUMN)46 Spokane(COLUMN)53(COLUMN)21 Syracuse(COLUMN)48(COLUMN)31 Topeka(COLUMN)66(COLUMN)53 Tucson(COLUMN)68(COLUMN)50 Tulsa(COLUMN)68(COLUMN)58 Washington(COLUMN)59(COLUMN)40 Wichita(COLUMN)70(COLUMN)53(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)48 Amsterdam(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)55 Ankara(COLUMN)pt. cldy(COLUMN)3 p.m.(COLUMN)52 Athens(COLUMN)pt. cldy(COLUMN)2 p.m.(COLUMN)63 Auckland(COLUMN)clear(COLUMN)midnight(COLUMN)55 Berlin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)54 Birmingham(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)59 Bonn(COLUMN)drizzle(COLUMN)1 p.m.(COLUMN)57 Brussels(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)57 Casablanca(COLUMN)clear(COLUMN)noon(COLUMN)72 Copenhagen(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)50 Dublin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)59 Geneva(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)48 Hong Kong(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)77 Jerusalem(COLUMN)dust(COLUMN)2 p.m.(COLUMN)79 Lisbon(COLUMN)clear(COLUMN)noon(COLUMN)66 London(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)64 Madrid(COLUMN)clear(COLUMN)1 p.m.(COLUMN)68 Malta(COLUMN)clear(COLUMN)1 p.m.(COLUMN)70 Manila(COLUMN)clear(COLUMN)8 p.m.(COLUMN)82 Moscow(COLUMN)rain(COLUMN)3 p.m.(COLUMN)41 New Delhi(COLUMN)clear(COLUMN)5 p.m.(COLUMN)88 Nice(COLUMN)clear(COLUMN)1 p.m.(COLUMN)64 Oslo(COLUMN)clear(COLUMN)1 p.m.(COLUMN)52 Paris(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)61 Peking(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)57 Rome(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)66 Saigon(COLUMN)pt. cldy(COLUMN)8 p.m.(COLUMN)82 Sofia(COLUMN)clear(COLUMN)2 p.m.(COLUMN)52 Stockholm(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)43 Sydney(COLUMN)clear(COLUMN)10 p.m.(COLUMN)64 Tokyo(COLUMN)haze(COLUMN)9 p.m.(COLUMN)66 Tunis(COLUMN)clear(COLUMN)1 p.m.(COLUMN)70 Vienna(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)55 Warsaw(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)48(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)pt. cldy(COLUMN)88(COLUMN)70 Barbados(COLUMN)pt. cldy(COLUMN)86(COLUMN)75 Bermuda(COLUMN)fair(COLUMN)81(COLUMN)73 Calgary(COLUMN)pt. cldy(COLUMN)45(COLUMN)30 Culiacan(COLUMN)clear(COLUMN)86(COLUMN)72 Edmonton(COLUMN)clear(COLUMN)45(COLUMN)32 Havana(COLUMN)pt. cldy(COLUMN)80(COLUMN)72 Kingston(COLUMN)clear(COLUMN)88(COLUMN)75 Montego Bay(COLUMN)clear(COLUMN)84(COLUMN)73 Mexico City(COLUMN)pt. cldy(COLUMN)72(COLUMN)45 Monterrey(COLUMN)cloudy(COLUMN)77(COLUMN)66 Montreal(COLUMN)cloudy(COLUMN)39(COLUMN)36 Nassau(COLUMN)fair(COLUMN)86(COLUMN)73 Ottawa(COLUMN)cloudy(COLUMN)39(COLUMN)32 Regina(COLUMN)cloudy(COLUMN)46(COLUMN)34 Toronto(COLUMN)pt. cldy(COLUMN)45(COLUMN)39 Vancouver(COLUMN)clear(COLUMN)52(COLUMN)36 Vera Cruz(COLUMN)pt. cldy(COLUMN)84(COLUMN)70 Winnipeg(COLUMN)cloudy(COLUMN)54(COLUMN)36(END TABLE)