Washington. Today - Partly cloudy, high in the mid 50s, low near 40. The chance of rain is near zero today and 20 per cent tonight. Sunday - Cloudy, high near 50.

Maryland and Virginia: Today - Partly cloudy, high in the 50s, lows from the mid 30s to near 40. Sunday - Cloudy, highs from the 40s to low 50s.

West Virginia: Today - Mostly cloudy with a chance of rain mixed with light snow in the northern portions of the state. Sunday - Cloudy, chance of rain. Highs Saturday will range from the 40s to low 50s, lows will be in the 30s.

Extended Area Forecast for Monday through Wednesday - Variable cloudiness and cool Monday. Highs from the 40s to low 50s. Partly cloudy and warmer Tuesday and Wednesday with a chance of showers Wednesday. Highs Tuesday and Wednesday in the 60s, lows in the 40s. Normal Washington temperatures for the period are a high of 8 and a low of 31.

Lower Potomac and Chesapeake Bay - Fair, with variable winds becoming southerly at 10 knots by afternoon. Waves will average 1 to 2 feet. Visibility will be 5 miles or more.

The National Weather Forecast for today - Showers will fall along the northern Pacific Coast inland into the northern intermountain region. Rain, with snow in the higher elevations, will continue over the northern Rocikes, and snow will spread into the northern Plains. There will be some showers in Florida and snow flurries over the lower Great Lakes. Cloudy skies will cover portions of the central Rockies and Central Plains. Temperatures will be cooler along the northern and middle Atlantic Coast, and colder across the northern Great Lakes. Warmer weather is expected from Alabama and Tennessee into eastern Texas. Mild temperatures will prevail in the Pacific Northwest and southwestern quarter of the nation.

Almanac Data for today - Sun rises 7:09 a.m., sets 4:46 p.m.; moon rises 00:00, sets 12:15 p.m. Tides: High, 12:32 a.m. and 1:03 p.m.; low, 7:36 a.m. and 7:59 p.m. High and low tides at the following locations may 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).

The Council of Governments' Air Quality Index for yesterday showed the high reading in the Washington area during the 3 p.m. period was 8 for the pollutant, carbon monoxide. Index values between 0 and 24 indicate good 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 remain good.

The National Weather Service forecasts the Potomac River stage at Little Falls should rise from 5.4 feet to a crest of 6.5 feet by morning and fall slowly thereafter. Stages above 5 feet are considered hazardous for recreational activities.

Washington data at 7 p.m. (EST) yesterday: Highest temperature since 7 a.m. yesterday, 55 degrees since midnight, 45 degrees at 6:18 a.m. Excess of temperature since Dec. 1, 18 degrees. Excess of temperature since Jan. 1, 560 degrees in 1976. Relative humidity: Maximum, 77 per cent at 10 a.m.; minimum, 38 per cent at noon, 24 hour precipitation, none. Deficiency of precipitation since Dec. 1, 11 inches. Deficiency of precipitation since Jan. 1, 4:68 inches. Highest observed wind since 7 a.m., 16 miles per hour from the southwest at 2:10 p.m. Local Temp., Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 midn(COLUMN)51(COLUMN)61 01 a.m.(COLUMN)51(COLUMN)59 02 a.m.(COLUMN)50(COLUMN)59 03 a.m.(COLUMN)50(COLUMN)59 04 a.m.(COLUMN)47(COLUMN)63 05 a.m.(COLUMN)48(COLUMN)56 06 a.m.(COLUMN)48(COLUMN)48 07 a.m.(COLUMN)45(COLUMN)60 08 a.m.(COLUMN)45(COLUMN)68 09 a.m.(COLUMN)46(COLUMN)74 10 a.m.(COLUMN)47(COLUMN)77 11 a.m.(COLUMN)49(COLUMN)74 12 noon(COLUMN)54(COLUMN)38 01 p.m.(COLUMN)54(COLUMN)38 02 p.m.(COLUMN)52(COLUMN)45 03 p.m.(COLUMN)52(COLUMN)48 04 p.m.(COLUMN)53(COLUMN)52 05 p.m.(COLUMN)52(COLUMN)50 06 p.m.(COLUMN)50(COLUMN)54 07 p.m.(COLUMN)47(COLUMN)66(END TABLE) Temperatures ending 7 a.m. (EST) yesterday:(TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)46(COLUMN)86 Albuquerque(COLUMN)46(COLUMN)25 Amarillo(COLUMN)41(COLUMN)26 Anchorage(COLUMN)11(COLUMN)-05 Asheville(COLUMN)62(COLUMN)38 Atlanta(COLUMN)64(COLUMN)40 Atlantic City(COLUMN)57(COLUMN)45 Austin(COLUMN)61(COLUMN)40 Baltimore(COLUMN)58(COLUMN)44 Billings(COLUMN)33(COLUMN)25 Birmingham(COLUMN)65(COLUMN)38 Bismarck(COLUMN)27(COLUMN)20 Boise(COLUMN)44(COLUMN)39 Boston(COLUMN)51(COLUMN)45 Brownsville(COLUMN)79(COLUMN)55 Buffalo(COLUMN)59(COLUMN)40 Burlington, Vt.(COLUMN)45(COLUMN)39 Casper(COLUMN)32(COLUMN)26 Charleston, S.C.(COLUMN)68(COLUMN)54 Charleston,W.V.(COLUMN)63(COLUMN)40 Charlotte(COLUMN)62(COLUMN)43 Cheyenne(COLUMN)31(COLUMN)30 Chicago(COLUMN)4026 Cincinnati(COLUMN)57(COLUMN)33 Cleveland(COLUMN)59(COLUMN)36 Columbia, S.C.(COLUMN)72(COLUMN)46 Columbus(COLUMN)60(COLUMN)36 Dal. Ft. Worth(COLUMN)56(COLUMN)36 Dayton(COLUMN)57(COLUMN)33 Denver(COLUMN)43(COLUMN)34 Des Moines(COLUMN)35(COLUMN)26 Detroit(COLUMN)53(COLUMN)33 Duluth(COLUMN)15(COLUMN)11 El Paso(COLUMN)60(COLUMN)37 Fairbanks(COLUMN)-11(COLUMN)-22 Fargo(COLUMN)24(COLUMN)15 Flagstaff(COLUMN)52(COLUMN)28 Great Falls(COLUMN)39(COLUMN)32 Hartford(COLUMN)44(COLUMN)36 Helena(COLUMN)36(COLUMN)19 Honolulu(COLUMN)84(COLUMN)75 Houston(COLUMN)68(COLUMN)53 Indianapolis(COLUMN)56(COLUMN)30 Jackson(COLUMN)55(COLUMN)36 Jacksonville(COLUMN)74(COLUMN)57 Juneau(COLUMN)33(COLUMN)13 Kansas City(COLUMN)43(COLUMN)29 Las Vegas(COLUMN)69(COLUMN)44 Little Rock(COLUMN)54(COLUMN)37 Los Angeles(COLUMN)81(COLUMN)58 Louisville(COLUMN)61(COLUMN)39 Memphis(COLUMN)53(COLUMN)41 Miami Beach(COLUMN)82(COLUMN)76 Midland(COLUMN)60(COLUMN)30 Milwaukee(COLUMN)36(COLUMN)25 Mpls.-St. Paul(COLUMN)27(COLUMN)18 Nashville(COLUMN)64(COLUMN)33 New Orleans(COLUMN)64(COLUMN)47 New York(COLUMN)47(COLUMN)42 Norfolk(COLUMN)74(COLUMN)54 North Platte(COLUMN)40(COLUMN)18 Oklahoma City(COLUMN)56(COLUMN)32 Omaha(COLUMN)38(COLUMN)20 Orlando(COLUMN)85(COLUMN)69 Philadelphia(COLUMN)50(COLUMN)38 Phoenix(COLUMN)73(COLUMN)47 Pittsburg(COLUMN)65(COLUMN)39 Portland, Me.(COLUMN)(COLUMN) Portland, Or.(COLUMN)56(COLUMN)53 Providence(COLUMN)49(COLUMN)41 Raleigh(COLUMN)67(COLUMN)40 Rapid City(COLUMN)35(COLUMN)21 Reno(COLUMN)50(COLUMN)24 Richmond(COLUMN)65(COLUMN)44 St. Louis(COLUMN)49(COLUMN)30 St. Prog.-Tampa(COLUMN)79(COLUMN)62 Salt Lake City(COLUMN)40(COLUMN)36 San Antonio(COLUMN)65(COLUMN)36 San Diego(COLUMN)82(COLUMN)57 San Francisco(COLUMN)59(COLUMN)53 San Juan(COLUMN)85(COLUMN)75 St. Ste. Marie(COLUMN)35(COLUMN)31 Seattle(COLUMN)55(COLUMN)53 Shreveport(COLUMN)58(COLUMN)35 Sioux Falls(COLUMN)30(COLUMN)23 Spokane(COLUMN)42(COLUMN)36 Syracuse(COLUMN)58(COLUMN)39 Topeka(COLUMN)48(COLUMN)23 Tucson(COLUMN)67(COLUMN)43 Tulsa(COLUMN)58(COLUMN)33 Washington(COLUMN)59(COLUMN)45 Wichita(COLUMN)50(COLUMN)25(END TABLE) Temperatures Abroad Yesterday(TABLE) CitySHWeather(COLUMN)TimeSHTemp.SD Aberdeen(COLUMN)cloudy(COLUMN)01 p.m.(COLUMN)43 Amsterdam(COLUMN)cloudy(COLUMN)01 p.m.(COLUMN)37 Ankara(COLUMN)pt. Cldy.(COLUMN)03 p.m.(COLUMN)55 Athens(COLUMN)pt. Cldy.(COLUMN)02 p.m.(COLUMN)64 Auckland(COLUMN)Clear(COLUMN)midnight(COLUMN)55 Berlin(COLUMN)cloudy(COLUMN)01 p.m.(COLUMN)37 Birmingham(COLUMN)clear(COLUMN)01 p.m.(COLUMN)39 Brussels(COLUMN)cloudy(COLUMN)01 p.m.(COLUMN)32 Casablanca(COLUMN)clear(COLUMN)noon(COLUMN)66 Copenhagen(COLUMN)cloudy(COLUMN)01 p.m.(COLUMN)37 Dublin(COLUMN)cloudy(COLUMN)01 p.m.(COLUMN)45 Geneva(COLUMN)pt. cldy.(COLUMN)01 p.m.(COLUMN)32 Hong Kong(COLUMN)clear(COLUMN)08 p.m.(COLUMN)64 Lisbon(COLUMN)cloudy(COLUMN)noon(COLUMN)64 London(COLUMN)clear(COLUMN)01 p.m.(COLUMN)41 Madrid(COLUMN)cloudy(COLUMN)01 p.m.(COLUMN)45 Malta(COLUMN)rain(COLUMN)01 p.m.(COLUMN)59 Manila(COLUMN)cloudy(COLUMN)08 p.m.(COLUMN)77 Moscow(COLUMN)snow(COLUMN)03 p.m.(COLUMN)21 New Delhi(COLUMN)clear(COLUMN)05 p.m.(COLUMN)70 Nice(COLUMN)clear(COLUMN)01 p.m.(COLUMN)55 Oslo(COLUMN)cloudy(COLUMN)01 p.m.(COLUMN)28 Paris(COLUMN)clear(COLUMN)01 p.m.(COLUMN)36 Peking(COLUMN)clear(COLUMN)08 p.m.(COLUMN)36 Rome(COLUMN)clear(COLUMN)01 p.m.(COLUMN)52 Saigon(COLUMN)cloudy(COLUMN)08 p.m.(COLUMN)79 Sofia(COLUMN)cloudy(COLUMN)02 p.m.(COLUMN)45 Stockholm(COLUMN)clear(COLUMN)01 p.m.(COLUMN)37 Sydney(COLUMN)clear(COLUMN)10 p.m.(COLUMN)84 Tel Aviv(COLUMN)cloudy(COLUMN)02 p.m.(COLUMN)73 Tokyo(COLUMN)clear(COLUMN)09 p.m.(COLUMN)46 Tunis(COLUMN)clear(COLUMN)01 p.m.(COLUMN)63 Vienna(COLUMN)cloudy(COLUMN)01 p.m.(COLUMN)28 Warsaw(COLUMN)cloudy(COLUMN)01 p.m.(COLUMN)27 (END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)fair(COLUMN)91(COLUMN)77 Bermuda(COLUMN)pt. cldy.(COLUMN)77(COLUMN)72 Bermuda(COLUMN)pt. cldy.(COLUMN)77(COLUMN)82 Bogota(COLUMN)cloudt(COLUMN)68(COLUMN)37 Calgary(COLUMN)fog(COLUMN)27(COLUMN)12 Culiacan(COLUMN)pt. cldt.(COLUMN)86(COLUMN)59 Edmonton(COLUMN)snow(COLUMN)28(COLUMN)14 Havana(COLUMN)clear(COLUMN)86(COLUMN)72 Kingston(COLUMN)pt. cldy.(COLUMN)88(COLUMN)87 Montego Bay(COLUMN)fair(COLUMN)87(COLUMN)75 Mexico City(COLUMN)haze(COLUMN)64(COLUMN)52 Monterrey(COLUMN)fair(COLUMN)77(COLUMN)50 Montreal(COLUMN)rain(COLUMN)43(COLUMN)37 Nassau(COLUMN)pt. cldy.(COLUMN)84(COLUMN)68 Ortawa(COLUMN)cloudy(COLUMN)45(COLUMN)37 Regina(COLUMN)snow(COLUMN)21(COLUMN)02 St. Kitts(COLUMN)pt. cldy.(COLUMN)85(COLUMN)73 St. Thomas(COLUMN)fair(COLUMN)85(COLUMN)73 Toronto(COLUMN)cloudy(COLUMN)54(COLUMN)34 Vancouver(COLUMN)rain(COLUMN)43(COLUMN)41 Veracruz(COLUMN)cloudy(COLUMN)79(COLUMN)65(END TABLE)