Washington: Today: Partly cloudy, high in mid to upper 60s, low in low to mid 50s. Chance of rain 10 per cent today, 20 per cent tonight. Tuesday - Chance of rain, high in low to mid 70s.

Maryland: Today: - Partly cloudy, high in 60s, lows in 40s to low 50s. Chance of rain in west. Tuesday - Chance of rain, highs in 60s.

Virginia: Today - Partly cloudy, highs in 60s to low 70s, lows near 50. Chance of rain in west. Tuesday - Chance of rain, highs in 70s.

Lower Potomac and Chesapeake Bay: Today - Fair skies with southerly winds 8 to 15 knots and visibility greater than 5 miles through tonight.

Washington date at 7 p.m. (EDT) yesterday: Highest temperature since 7 a.m. yesterday, 62 degrees at 3:29 p.m. Lowest temperature since midnight, 36 degrees at 4:20 a.m. Excess of temperature since March 1, 181 degrees. Deficiency of temperature since Jan. 1, 76 degrees. Record high temperature for today, 84 degrees in 1945. Record low temperature for today, 21 degrees in 1894. Relatively humidity: Maximum, 70 per cent at 3 a.m.; minimum, 28 per cent at 2 p.m. 24-hour precipitation, none. Deficiency of precipitation since March 1, .83 inches. Deficiency of precipitation since Jan. 1, 3.74 inches. Highest observed wind since 7 a.m., 10 miles per hour from the SSE at 3 p.m. Peak gust since 7 a.m., 15 miles per hour from the SW at 1:14 p.m.

The National Weather Forecast for Today - Showers and thunderstorms will occur throughout the Mississippi Valley and spread eastward to the Ohio Valley, Appalachians, Great Lakes region and the interior of the north Atlantic states. Rain will fall over the northern Plains with some snow in the western Dakotas and east Montana. Snow is also likely over the northern and central Rockies. Most other areas of the nation will have clear or partly cloudy skies. Temperatures will be mild over the east half of the nation and in the southern Plains and sourthern Rockies. Cool temperatures will prevail from the northern Plains to the Pacific coasts.

Extended Area Outlook: For Wednesday through Friday - Rain likely Wednesday followed by clearing skies through remainder of period. Temperatures should range from Wednesday's highs in mid 60s to mid 70s and lows near 50 to Friday's highs in 50s and lows in 30s. Washington's normal temperature range for this time of year is from 61 to 40.

West Virginia: Today - Mostly cloudy, highs in 70s, lows in mid 40 to mid 50. Chance of rain this afternoon and evening. Tuesday - Chance or rain, highs in 70s.

The Council of Governments' Air Quality Index for yesterday showed the high reading in the Washington area during the 9 to 10 a.m. period was 11 for the pollutant, photochemical oxidants. Index values between 0 and 24 indicate good air quality. When the index exceeds 100 the air becomes hazardous and persons with lung, heart and eye problems should restrict their activity.

The National Weather Service forecasts that the Potomac River stage at Little Falls will fall to 4.7 feet this morning. Local Temp., Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 midn.(COLUMN)42(COLUMN)57 1 a.m.(COLUMN)42(COLUMN)62 2 a.m.(COLUMN)41(COLUMN)65 3 a.m.(COLUMN)37(COLUMN)70 4 a.m.(COLUMN)37(COLUMN)67 5 a.m.(COLUMN)37(COLUMN)64 6 a.m.(COLUMN)38(COLUMN)73 7 a.m.(COLUMN)38(COLUMN)70 8 a.m.(COLUMN)44(COLUMN)63 9 a.m.(COLUMN)49(COLUMN)52 10 a.m.(COLUMN)50(COLUMN)44 11 a.m.(COLUMN)52(COLUMN)43 12 noon(COLUMN)56(COLUMN)38 1 p.m.(COLUMN)59(COLUMN)31 2 p.m.(COLUMN)61(COLUMN)28 3 p.m.(COLUMN)61(COLUMN)33 4 p.m.(COLUMN)62(COLUMN)34 5 p.m.(COLUMN)62(COLUMN)35 6 p.m.(COLUMN)57(COLUMN)49(END TABLE) Temperatures ending 7 a.m. (EST) yesterday:(TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)45(COLUMN)23 Albuquerque(COLUMN)61(COLUMN)33 Amarillo(COLUMN)70(COLUMN)51 Anchorage(COLUMN)35(COLUMN)23 Asheville(COLUMN)72(COLUMN)40 Atlanta(COLUMN)73(COLUMN)49 Atlantic City(COLUMN)54(COLUMN)33 Austin(COLUMN)69(COLUMN)68 Baltimore(COLUMN)57(COLUMN)30 Billings(COLUMN)49(COLUMN)32 Birmingham(COLUMN)77(COLUMN)61 Bismarck(COLUMN)43(COLUMN)27 Boise(COLUMN)56(COLUMN)41 Boston(COLUMN)54(COLUMN)36 Brownsville(COLUMN)83(COLUMN)72 Buffalo(COLUMN)39(COLUMN)28 Burlington, Vt.(COLUMN)40(COLUMN)21 Casper(COLUMN)52(COLUMN)29 Charleston, S.C.(COLUMN)76(COLUMN)56 Charleston, W.V.(COLUMN)65(COLUMN)35 Charlotte, N.C.(COLUMN)72(COLUMN)48 Cheyenne(COLUMN)55(COLUMN)28 Chicago(COLUMN)68(COLUMN)55 Cincinnati(COLUMN)66(COLUMN)48 Cleveland(COLUMN)48(COLUMN)33 Columbia, S.C.(COLUMN)77(COLUMN)46 Columbus, Ohio(COLUMN)60(COLUMN)39 Dal. Ft. Worth(COLUMN)67(COLUMN)61 Dayton(COLUMN)62(COLUMN)42 Denver(COLUMN)61(COLUMN)33 Des Moines(COLUMN)68(COLUMN)56 Detroit(COLUMN)47(COLUMN)30 Duluth(COLUMN)51(COLUMN)38 El Paso(COLUMN)61(COLUMN)36 Fairbanks(COLUMN)15(COLUMN)-7 Fargo(COLUMN)39(COLUMN)28 Flagstaff(COLUMN)47(COLUMN)24 Great Falls(COLUMN)48(COLUMN)35 Hartford(COLUMN)50(COLUMN)28 Helena(COLUMN)46(COLUMN)36 Honolulu(COLUMN)82(COLUMN)65 Houston(COLUMN)70(COLUMN)68 Indianapolis(COLUMN)68(COLUMN)46 Jackson, Miss.(COLUMN)78(COLUMN)66 Jacksonville(COLUMN)78(COLUMN)49 Juneau(COLUMN)38(COLUMN)35 Kansas City(COLUMN)67(COLUMN)57 Las Vegas(COLUMN)66(COLUMN)42 Little Rock(COLUMN)72(COLUMN)56 Los Angeles(COLUMN)69(COLUMN)50 Louisville(COLUMN)72(COLUMN)50 Memphis(COLUMN)78(COLUMN)62 Miami Beach(COLUMN)74(COLUMN)70 Midland(COLUMN)62(COLUMN)50 Milwaukee(COLUMN)56(COLUMN)44 Mpls.-St. Paul(COLUMN)64(COLUMN)40 Nashville(COLUMN)75(COLUMN)56 New Orleans(COLUMN)79(COLUMN)70 New York(COLUMN)53(COLUMN)35 Norfolk(COLUMN)53(COLUMN)33 North Platte(COLUMN)57(COLUMN)28 Oklahoma City(COLUMN)69(COLUMN)57 Omaha(COLUMN)70(COLUMN)49 Orlando(COLUMN)78(COLUMN)53 Philadelphia(COLUMN)56(COLUMN)36 Phoenix(COLUMN)61(COLUMN)48 Pittsburgh(COLUMN)52(COLUMN)30 Portland, Me.(COLUMN)45(COLUMN)32 Portland, Ore.(COLUMN)57(COLUMN)45 Providence(COLUMN)53(COLUMN)35 Raleigh(COLUMN)70(COLUMN)35 Rapid City(COLUMN)58(COLUMN)28 Reno(COLUMN)61(COLUMN)27 Richmond(COLUMN)63(COLUMN)27 St Louis(COLUMN)76(COLUMN)57 St. Prbq-Tampa(COLUMN)82(COLUMN)62 Salt Lake City(COLUMN)50(COLUMN)35 San Antonio(COLUMN)72(COLUMN)69 San Diego(COLUMN)61(COLUMN)52 San Francisco(COLUMN)65(COLUMN)49 San Juan, P.R.(COLUMN)86(COLUMN)73 St. Ste. Marie(COLUMN)37(COLUMN)28 Seattle(COLUMN)49(COLUMN)40 Shreveport(COLUMN)78(COLUMN)66 Sioux Falls(COLUMN)58(COLUMN)30 Spokane(COLUMN)49(COLUMN)40 Syracuse(COLUMN)37(COLUMN)20 Tucson(COLUMN)50(COLUMN)43 Tulsa(COLUMN)73(COLUMN)57 Washington(COLUMN)58(COLUMN)36 Wichita(COLUMN)72(COLUMN)55(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)36 Amsterdam(COLUMN)rain(COLUMN)1 p.m.(COLUMN)43 Ankara(COLUMN)cloudy(COLUMN)3 p.m.(COLUMN)57 Athens(COLUMN)cloudy(COLUMN)2 p.m.(COLUMN)63 Auckland(COLUMN)cloudy(COLUMN)midnight(COLUMN)59 Berlin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)41 Birmingham(COLUMN)rain(COLUMN)1 p.m.(COLUMN)37 Brussels(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)48 Cairo(COLUMN)clear(COLUMN)2 p.m.(COLUMN)81 Casablanca(COLUMN)cloudy(COLUMN)noon(COLUMN)64 Copenhagen(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)43 Dublia(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)41 Geneva(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)55 Hong Kong(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)72 Lisbon(COLUMN)cloudy(COLUMN)noon(COLUMN)61 London(COLUMN)rain(COLUMN)1 p.m.(COLUMN)45 Madrid(COLUMN)clear(COLUMN)1 p.m.(COLUMN)61 Malta(COLUMN)clear(COLUMN)1 p.m.(COLUMN)66 Manila(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)82 Moscow(COLUMN)clear(COLUMN)3 p.m.(COLUMN)41 New Delhi(COLUMN)cloudy(COLUMN)5 p.m.(COLUMN)88 Nice(COLUMN)clear(COLUMN)1 p.m.(COLUMN)61 Oslo(COLUMN)snow(COLUMN)1 p.m.(COLUMN)32 Paris(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)54 Peking(COLUMN)clear(COLUMN)8 p.m.(COLUMN)48 Rome(COLUMN)clear(COLUMN)1 p.m.(COLUMN)64 Saigon(COLUMN)clear(COLUMN)8 p.m.(COLUMN)82 Sofia(COLUMN)clear(COLUMN)2 p.m.(COLUMN)66 Stockholm(COLUMN)snow(COLUMN)1 p.m.(COLUMN)30 Sydney(COLUMN)clear(COLUMN)10 p.m.(COLUMN)66 Tel Aviv(COLUMN)clear(COLUMN)2 p.m.(COLUMN)77 Tokyo(COLUMN)cloudy(COLUMN)9 p.m.(COLUMN)46 Tunis(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)68 Vienna(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)61 Warsaw(COLUMN)rain(COLUMN)1 p.m.(COLUMN)46(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)cloudy(COLUMN)86(COLUMN)72 Barbados(COLUMN)cloudy(COLUMN)82(COLUMN)75 Bermuda(COLUMN)rain(COLUMN)64(COLUMN)53 Bogota(COLUMN)cloudy(COLUMN)66(COLUMN)45 Calgary(COLUMN)clear(COLUMN)48(COLUMN)28 Edmonton(COLUMN)cloudy(COLUMN)48(COLUMN)25 Havana(COLUMN)cloudy(COLUMN)81(COLUMN)70 Kingston(COLUMN)cloudy(COLUMN)84(COLUMN)73 Montego Bay(COLUMN)cloudy(COLUMN)86(COLUMN)77 Mexico City(COLUMN)cloudy(COLUMN)77(COLUMN)55 Monterrey(COLUMN)coudy(COLUMN)77(COLUMN)64 Montreal(COLUMN)cloudy(COLUMN)36(COLUMN)23 Nassau(COLUMN)sunny(COLUMN)77(COLUMN)66 Ottawa(COLUMN)cloudy(COLUMN)39(COLUMN)21 Regina(COLUMN)clear(COLUMN)45(COLUMN)18 St. Kitts(COLUMN)cloudy(COLUMN)85(COLUMN)70 St. Thomas(COLUMN)cloudy(COLUMN)86(COLUMN)73 Toronto(COLUMN)cloudy(COLUMN)45(COLUMN)27 Vancouver(COLUMN)cloudy(COLUMN)48(COLUMN)39 Veracruz(COLUMN)cloudy(COLUMN)90(COLUMN)72 Winnipes(COLUMN)clear(COLUMN)41(COLUMN)32(END TABLE)