Washington Today - Cloudy, high in the mid 60s, low in the mid 50s. The chance of rain is 20 percent through tonight. Wind will be light and variable. Monday - Variably cloudy, rain possible, high in upper 60s.

Maryland and Virginia: Today - Cloudy, rain possible in some areas by tonight, highs from the low 60s to near 70, lows in the 50s. Monday - Cloudy, rain likely, highs from the low 60s to near 70.

Lower Potomac and Chesapeake Bay: Today - Cloudy with visibility of from 2 to 4 miles. Wind will be from the northeast at from 5 to 15 knots today, shiffting to from the southeast at from 10 to 15 knots tonight. Waves in unprotected waters will be less than 2 feet.

Extended Area Forecast for Tuesday through Thursday: Chance of rain on Tuesday, variably cloudy on Wednesday and on Thursday. Highs will be from the mid 60s to the 70s, lows from the mid 40s to the 50s. Noarmal Washington temperatures for the period are a high of 75 and a low of 54.

The National Weather Forecast for today - Rain and scattered thunderstorms will extend from the central Plains through most of the Mississippi Valley and from the upper Great Lakes through the lower Ohio Valley to the central Gulf Coast. Showers and thunderstorms will also scatter over the middle and southern Atlantic coast. Scattered snow will linger over the High Plains and the central and southern Rockies, while it will be sunny over the Plateau and the Far West, as well as over New England. Temperatures will be mild over the Pacific Coast and throughout the Southeast. Elsewhere, cool readings will prevail, with cold conditions in the snow covered areas of the Rocky Mountain region.

Almanac Data for today: The sun rises 6:04 a.m., sets 8:06 p.m.; moon rises 6:33 a.m., sets 8:38 p.m. Tides: high 2:27 a.m. and 3:01 p.m., low 8:14 a.m. and 8:41 p.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 Governments' Air Quality Index for yesterday showed the high reading in the Washington area during the 1 p.m. period was 21 for the pollutant, photochemical oxidants. Index values between zero and 24 indicates 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 National Weather Service forecasts the Potomac River stage at Little Falls should be near 3.9 fee today. Local Temps. Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 midnight(COLUMN)52(COLUMN)82 1 a.m.(COLUMN)52(COLUMN)86 2 a.m.(COLUMN)52(COLUMN)86 3 a.m.(COLUMN)52(COLUMN)86 4 a.m.(COLUMN)52(COLUMN)86 5 a.m.(COLUMN)51(COLUMN)89 6 a.m.(COLUMN)51(COLUMN)83 7 a.m.(COLUMN)51(COLUMN)83 8 a.m.(COLUMN)51(COLUMN)83 9 a.m.(COLUMN)52(COLUMN)86 10 a.m.(COLUMN)54(COLUMN)86 11 a.m.(COLUMN)54(COLUMN)86 12 noon(COLUMN)58(COLUMN)78 1 p.m.(COLUMN)59(COLUMN)75 2 p.m.(COLUMN)61(COLUMN)67 3 p.m.(COLUMN)63(COLUMN)56 4 p.m.(COLUMN)64(COLUMN)50 5 p.m.(COLUMN)65(COLUMN)48 6 p.m.(COLUMN)65(COLUMN)48(END TABLE) Temperatures ending 8 a.m. (DST) yesterday(TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)48(COLUMN)39 Albuquerque(COLUMN)59(COLUMN)36 Amarillo(COLUMN)62(COLUMN)53 Asheville(COLUMN)73(COLUMN)48 Atlanta(COLUMN)72(COLUMN)52 Atlanta City(COLUMN)46(COLUMN)44 Austin(COLUMN)89(COLUMN)71 Baltimore(COLUMN)50(COLUMN)49 Billings(COLUMN)45(COLUMN)39 Birmingham(COLUMN)72(COLUMN)53 Bismarck(COLUMN)67(COLUMN)40 Boise(COLUMN)59(COLUMN)36 Boston(COLUMN)49(COLUMN)45 Brownsville(COLUMN)87(COLUMN)77 Buffalo(COLUMN)46(COLUMN)41 Burlington(COLUMN)63(COLUMN)39 Casper(COLUMN)38(COLUMN)33 Charlestn, S.C.(COLUMN)80(COLUMN)63 Charlstn, WVa.(COLUMN)59(COLUMN)50 Charlotte(COLUMN)73(COLUMN)51 Cheyenne(COLUMN)33(COLUMN)30 Chicago(COLUMN)43(COLUMN)34 Cincinnati(COLUMN)53(COLUMN)39 Cleveland(COLUMN)54(COLUMN)46 Columbia, S.C.(COLUMN)76(COLUMN)52 Columbus, O.(COLUMN)54(COLUMN)46 Dal.-Ft. Worth(COLUMN)76(COLUMN)66 Dayton(COLUMN)53(COLUMN)46 Denver(COLUMN)40(COLUMN)33 Des Monies(COLUMN)52(COLUMN)36 Detroit(COLUMN)45(COLUMN)42 Duluth(COLUMN)57(COLUMN)30 El Paso(COLUMN)85(COLUMN)62 Fairbanks(COLUMN)56(COLUMN)37 Fargo(COLUMN)70(COLUMN)41 Flagstaff(COLUMN)52(COLUMN)20 Great Falls(COLUMN)44(COLUMN)41 Hartford(COLUMN)44(COLUMN)38 Helena(COLUMN)48(COLUMN)42 Honolulu(COLUMN)84(COLUMN)74 Houston(COLUMN)82(COLUMN)72 Indianapolis(COLUMN)53(COLUMN)47 Jackson, Miss(COLUMN)80(COLUMN)57 Jacksonville(COLUMN)83(COLUMN)60 Juneau(COLUMN)50(COLUMN)31 Kansas City(COLUMN)58(COLUMN)44 Las Vegas(COLUMN)72(COLUMN)46 Little Rock(COLUMN)60(COLUMN)54 Los Angeles(COLUMN)69(COLUMN)57 Louisville(COLUMN)60(COLUMN)43 Memphis(COLUMN)64H$56 Miami Beach(COLUMN)82(COLUMN)78 Midland-Odessa(COLUMN)89(COLUMN)66 Milwaukee(COLUMN)44(COLUMN)38 Mpls. St. Paul(COLUMN)67(COLUMN)43 Nashville(COLUMN)66(COLUMN)48 New Orleans(COLUMN)83(COLUMN)70 New York(COLUMN)45(COLUMN)44 Norfolk(COLUMN)60(COLUMN)51 North Platte(COLUMN)56(COLUMN)41 Oklahoma City(COLUMN)61(COLUMN)56 Omaha(COLUMN)62(COLUMN)43 Orlanda(COLUMN)89(COLUMN)68 Phoenix(COLUMN)86(COLUMN)62 Pittsburgh(COLUMN)58(COLUMN)47 Portland, Me.(COLUMN)50(COLUMN)29 Portland, Ore.(COLUMN)62(COLUMN)39 Providence(COLUMN)44(COLUMN)40 Raleigh(COLUMN)70(COLUMN)52 Rapid City(COLUMN)54(COLUMN)38 Reno(COLUMN)51(COLUMN)32 Richmond(COLUMN)62(COLUMN)50 St Louis(COLUMN)49(COLUMN)37 St Prbg. TmP(COLUMN)86(COLUMN)71 Salt Lake City(COLUMN)45(COLUMN)38 San Antonio(COLUMN)89(COLUMN)72 San Diego(COLUMN)69(COLUMN)60 San Francisco(COLUMN)69(COLUMN)62 San Juan(COLUMN)88(COLUMN)73 St. Ste. Marie(COLUMN)64(COLUMN)41 Seattle(COLUMN)60(COLUMN)43 Shreveport(COLUMN)81(COLUMN)60 Sioux Falls(COLUMN)62(COLUMN)34 Spokane(COLUMN)56(COLUMN)39 Syracuse(COLUMN)50(COLUMN)40 Topeka(COLUMN)61(COLUMN)45 Tucson(COLUMN)84(COLUMN)55 Tulsa(COLUMN)65(COLUMN)54 Washington(COLUMN)55(COLUMN)51 Wichita(COLUMN)59(COLUMN)47(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN) 52 Amsterdam(COLUMN)haze(COLUMN) 1 p.m.(COLUMN) 61 Ankara(COLUMN)clear(COLUMN) 3 p.m.(COLUMN) 63 Athens(COLUMN)pt. cldy(COLUMN) 2 p.m.(COLUMN) 70 Auckland(COLUMN)pt. cldy(COLUMN) mid(COLUMN) 59 Berlin(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN) 68 Birmingham(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN) 52 Brussels(COLUMN)pt. cldy(COLUMN) 1 p.m.(COLUMN) 66 Cairo(COLUMN)pt. cldy(COLUMN) 2 p.m.(COLUMN) 84 Casablanca(COLUMN)pt. cldy(COLUMN) noon(COLUMN) 64 Copenhagen(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN) 59 Dublin(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN) 48 Geneva(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN) 55 Hong Kong(COLUMN)clear(COLUMN) 8 p.m.(COLUMN) 77 Jerusalem(COLUMN)clear(COLUMN) 2 p.m.(COLUMN) 68 Lisbon(COLUMN)cloudy(COLUMN) noon(COLUMN) 55 London(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN) 55 Madrid(COLUMN)pt. cldy(COLUMN) 1 p.m.(COLUMN) 61 Malta(COLUMN)pt. cldy(COLUMN) 1 p.m.(COLUMN) 79 Manila(COLUMN)pt. cldy(COLUMN) 8 p.m.(COLUMN) 68 Moscow(COLUMN)clear(COLUMN) 3 p.m.(COLUMN) 54 New Delhi(COLUMN)clear(COLUMN) 5 p.m.(COLUMN)106 Nice(COLUMN)pt. cldy(COLUMN) 1 p.m.(COLUMN) 61 Oslo(COLUMN)clear(COLUMN) 1 p.m.(COLUMN) 61 Paris(COLUMN)rain(COLUMN) 1 p.m.(COLUMN) 48 Perking(COLUMN)cloudy(COLUMN) 8 p.m.(COLUMN) 73 Rome(COLUMN)pt. cldy(COLUMN) 1 p.m.(COLUMN) 64 Saigon(COLUMN)cloudy(COLUMN) 8 p.m.(COLUMN)91 Sofia(COLUMN)pt. cldy(COLUMN) 2 p.m.(COLUMN) 79 Stockholm(COLUMN)pt. cldy(COLUMN) 1 p.m.(COLUMN) 55 Sydney(COLUMN)clear(COLUMN)10 p.m.(COLUMN) 64 Tokyo(COLUMN)cloudy(COLUMN) 9 p.m.(COLUMN) 57 Vienna(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN) 68 Warsaw(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN) 66(END TABLE)