Washington: Today - Mostly sunny, high in 80s, low near 60. Chance of rain is 10 per cent through tonight. Tuesday - Partly cloudy with slight chance of rain high in 80s.

Maryland and Virginia: Today - Partly cloudy, highs in low 80s, lows in 50s to low 60s. Slight chance of rain through Tuesday. Tuesday - Partly cloudy, high in low 80s.

Lower Potomac and Chesapeake Bay: Today - Fair skies with visibility of 5 miles or more and southeasterly winds at as great as 15 knots through tonight.

Extended Area Outlook: For Wednesday through Friday - Partly cloudy with slight chance of thundershowers each day with highs in 80s, lows in 60s through period. Washington's normal temperature range for this time of year is from 80 to 59.

The National Weather Forecast for today - Rain and showers will occur in Washington, Oregon and northern California with some thundershowers in Idaho. Showers and thunderstorms will occur from the Great Lakes in to southeast states. The Atlantic Coast states from Virginia into Maine are not included in this area. Temperature will be hot over the lower Great Lakes and much of New England. Temperatures west of the nation will have mostly sunny skies and mild to warm temperatures.

ALMANAC DATA for Mon. May 23: Sun rises 5:50 a.m., sets 8:20 p.m.; moon rises 10:31 and sets 12:28 a.m. Tides: High 12:14 p.m. and 12:46 a.m. Low 6:41 a.m. and 7:18 p.m. High and low tides at the following locations can be obtained by subtracting the hours indicated from the tides above. Annapolis (3 1/2); Bloody Point Lighthouse (4 1/2); Deale; Md (4 1/2) Colonial Beach (6); Norfolk (1 1/2) Virginia Beach (1); Solomans 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 2 p.m. period was 37 for the pollutant, photochemical oxidants. Index values between 25 and 50 indicate fair air quality. When the index exceeds 100 the air becomes hazardous and person with lung, heart and eye problems should restrict their activity. The forecast for today indicates the air quality will remain about the same.

The National Weather Service forecasts that the Potomac River stage at Little Falls will remain near 3.2 feet through Tuesday.

Washington data at 8 p.m. (EDT) yesterday: Highest temperature since 8 a.m. yesterday, 84 degrees at 1:30 p.m. Lowest temperature since midnight. 60 degrees at 5:00a.m. Excess of temperature since May 1, 77, degrees. Excess of temperature since Jan. 1, 177 degrees. Record high temperature for today, 97 degrees in 1925. Record low temperature for today, 45 degrees in 1961. Relative humadity: Maximum, 90 per cent at 6 a.m., Minimum, 36 per cent at 2 p.m. 24-hour precipitation, none. Deficiency of precipitation since May 1, 1.30 inches. Deficiency of precipitation sice Jan. 1 5.57 inches. Highest observed wind since 8 a.m., 12 miles per hour from the south of 3:53 p.m. Peak gust since 8 a.m., 16 miles per hour from the south at 5:29 p.m. Local Temp., Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 midngt(COLUMN)68(COLUMN)79 1 a.m.(COLUMN)68(COLUMN)79 2 a.m.(COLUMN)67(COLUMN)81 3 a.m.(COLUMN)66(COLUMN)84 4 a.m.(COLUMN)65(COLUMN)87 5 a.m.(COLUMN)65(COLUMN)87 6 a.m.(COLUMN)64(COLUMN)90 7 a.m.(COLUMN)66(COLUMN)87 8 a.m.(COLUMN)67(COLUMN)81 9 a.m(COLUMN)70(COLUMN)73 10 a.m.(COLUMN)74(COLUMN)64 11 a.m.(COLUMN)78(COLUMN)56 12 noon(COLUMN)80(COLUMN)51 1 p.m.(COLUMN)82(COLUMN)38 2 p.m.(COLUMN)84(COLUMN)36 3 p.m.(COLUMN)84(COLUMN)43 4 p.m.(COLUMN)83(COLUMN)48 6 p.m.(COLUMN)81(COLUMN)51(END TABLE) Temperatures ending 8 a.m. (EDT) Yesterday(TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)87(COLUMN)61 Albuquerque(COLUMN)77(COLUMN)43 Amariflo(COLUMN)72(COLUMN)51 Anchorage(COLUMN)55(COLUMN)46 Asheville(COLUMN)75(COLUMN)58 Atlanta(COLUMN)80(COLUMN)62 Atlantic City(COLUMN)65(COLUMN)60 Austin(COLUMN)82(COLUMN)84 Baltimore(COLUMN)86(COLUMN)56 Billings(COLUMN)72(COLUMN)50 Birmingham(COLUMN)89(COLUMN)68 Bismarck(COLUMN)72(COLUMN)51 Boise(COLUMN)74(COLUMN)49 Boston(COLUMN)77(COLUMN)64 Brownsville(COLUMN)84(COLUMN)76 Buffalo(COLUMN)90(COLUMN)68 Burlingto, Vt.(COLUMN)91(COLUMN)68 Casper(COLUMN)63(COLUMN)38 Charleston, S. C.(COLUMN)81(COLUMN)70 Ch'ristin, W. Va.(COLUMN)89(COLUMN)60 Charlotte, N. C.(COLUMN)82(COLUMN)65 Cheyene(COLUMN)57(COLUMN)34 Chicago(COLUMN)92(COLUMN)75 Cincinnati(COLUMN)86(COLUMN)66 Cleveland(COLUMN)88(COLUMN)64 Columbia, S. C.(COLUMN)84(COLUMN)60 Columbus, Ohio(COLUMN)89(COLUMN)65 Dat.-Ft. Worth(COLUMN)86(COLUMN)68 Dayton(COLUMN)88(COLUMN)64 Denver(COLUMN)67(COLUMN)40 Des Moines(COLUMN)79(COLUMN)61 Detroit(COLUMN)92(COLUMN)64 Duluth(COLUMN)69(COLUMN)55 El Paso(COLUMN)82(COLUMN)43 Fairbanks(COLUMN)59(COLUMN)39 Fargo(COLUMN)75(COLUMN)57 Flagstaff(COLUMN)70(COLUMN)30 Great Falls(COLUMN)67(COLUMN)40 Hartford(COLUMN)83(COLUMN)60 Helena(COLUMN)85(COLUMN)73 Honolulu(COLUMN)85(COLUMN)73 Houston(COLUMN)80(COLUMN)72 Indianapolis(COLUMN)90(COLUMN)69 Jackson, Miss.(COLUMN)86(COLUMN)60 Jacksonville(COLUMN)86(COLUMN)62 Juneau(COLUMN)53(COLUMN)42 Kansas City(COLUMN)75(COLUMN)58 Las Vegas(COLUMN)93(COLUMN)67 Little Rock(COLUMN)83(COLUMN)67 Los Angeles(COLUMN)77(COLUMN)59 Louisville(COLUMN)87(COLUMN)69 Memphis(COLUMN)90(COLUMN)69 Miami Beach(COLUMN)78(COLUMN)75 Midland(COLUMN)88(COLUMN)63 Milwaukee(COLUMN)80(COLUMN)60 Mpls.-St. Paul(COLUMN)70(COLUMN)61 Nashville(COLUMN)89(COLUMN)69 New Orleans(COLUMN)85(COLUMN)65 New York(COLUMN)80(COLUMN)62 Norfolk(COLUMN)80(COLUMN)61 North Platte(COLUMN)54(COLUMN)48 Oklahoma City(COLUMN)75(COLUMN)53 Omaha(COLUMN)77(COLUMN)57 Orlando(COLUMN)88(COLUMN)64 Philadelphia(COLUMN)84(COLUMN)57 Phoenix(COLUMN)94(COLUMN)63 Pittsburgh(COLUMN)84(COLUMN)53 Portland, Me.(COLUMN)64(COLUMN)48 Portland, Ore.(COLUMN)67(COLUMN)44 Providence(COLUMN)82(COLUMN)62 Raleigh(COLUMN)83(COLUMN)61 Rapid City(COLUMN)53(COLUMN)44 Reno(COLUMN)74(COLUMN)42 Richmond(COLUMN)85(COLUMN)57 St. Louis(COLUMN)90(COLUMN)69 St. Prbg-Tampa(COLUMN)89(COLUMN)65 Salt Lake City(COLUMN)69(COLUMN)60 San Antonio(COLUMN)80(COLUMN)66 San Diego(COLUMN)68(COLUMN)58 San Francisco(COLUMN)59(COLUMN)51 San Juan, P. R.(COLUMN)80(COLUMN)76 St. Ste. Marie(COLUMN)81(COLUMN)57 Seattle(COLUMN)65(COLUMN)51 Shreveport(COLUMN)84(COLUMN)65 Sioux Fall(COLUMN)73(COLUMN)57 Spokane(COLUMN)67(COLUMN)43 Syracuse(COLUMN)96(COLUMN)63 Topeka(COLUMN)74(COLUMN)57 Tucson(COLUMN)86(COLUMN)59 Tulsa(COLUMN)81(COLUMN)56 Washington(COLUMN)87(COLUMN)60 Wichita(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)T. Aberdeen(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)66 Amsterdam(COLUMN)clear(COLUMN)1 p.m.(COLUMN)64 Ankara(COLUMN)cloudy(COLUMN)3 p.m.(COLUMN)77 Athens(COLUMN)clear(COLUMN)2 p.m.(COLUMN)77 Auckland(COLUMN)rain(COLUMN)midnight(COLUMN)61 Berlin(COLUMN)clear(COLUMN)1 p.m.(COLUMN)61 Birmingham(COLUMN)clear(COLUMN)1 p.m.(COLUMN)63 Brussels(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)46 Casablanca(COLUMN)cloudy(COLUMN)noon(COLUMN)68 Copenhagen(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)59 Dublin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)61 Geneva(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)64 Hong Kong(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)81 Lisbon(COLUMN)cloudy(COLUMN)noon(COLUMN)63 London(COLUMN)clear(COLUMN)1 p.m.(COLUMN)66 Madrid(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)59 Malta(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)75 Manila(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)84 Moscow(COLUMN)cloudy(COLUMN)3 p.m.(COLUMN)43 New Delhi(COLUMN)cloudy(COLUMN)5 p.m.(COLUMN)104 Nice(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)66 Oslo(COLUMN)clear(COLUMN)1 p.m.(COLUMN)68 Paris(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)59 Peking(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)63 Rome(COLUMN)clear(COLUMN)1 p.m.(COLUMN)82 Saigon(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)82 Sofia(COLUMN)cloudy(COLUMN)2 p.m.(COLUMN)77 Stockholm(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)64 Sydney(COLUMN)clear(COLUMN)10 p.m.(COLUMN)50 Tel Aviv(COLUMN)clear(COLUMN)2 p.m.(COLUMN)86 Tokyo(COLUMN)rain(COLUMN)9 p.m.(COLUMN)59 Tunis(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)84 Vienna(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)55 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)87(COLUMN)81 Barbados(COLUMN)cloudy(COLUMN)86(COLUMN)79 Bermuda(COLUMN)sunny(COLUMN)72(COLUMN)69 Bogota(COLUMN)cloudy(COLUMN)66(COLUMN)46 Calgary(COLUMN)cloudy(COLUMN)66(COLUMN)43 Edmonton(COLUMN)cloudy(COLUMN)70(COLUMN)46 Havana(COLUMN)cloudy(COLUMN)82(COLUMN)72 Kingston(COLUMN)cloudy(COLUMN)86(COLUMN)75 Montego Bay(COLUMN)cloudy(COLUMN)84(COLUMN)72 Mexico(COLUMN)cloudy(COLUMN)82(COLUMN)59 Monterrey(COLUMN)cloudy(COLUMN)91(COLUMN)75 Montreal(COLUMN)clear(COLUMN)88(COLUMN)59 Nassau(COLUMN)sunny(COLUMN)82(COLUMN)72 Ottawa(COLUMN)clear(COLUMN)66(COLUMN)61 Regina(COLUMN)clear(COLUMN)75(COLUMN)46 St. Kitts(COLUMN)cloudy(COLUMN)88(COLUMN)77 Toronto(COLUMN)clear(COLUMN)84(COLUMN)55 Vancouver(COLUMN)cloudy(COLUMN)63(COLUMN)45 Veracrus(COLUMN)cloudy(COLUMN)93(COLUMN)77 Winnipeg(COLUMN)cloudy(COLUMN)77(COLUMN)57(END TABLE)