Washington: Today - Partly cloudy, high in low to mid 80s, low near 60. Chance of rain 10 per cent through tonight.Tuesday - Partly cloudy, high in low to mid 60s.

Maryland and Virginia: Today - Partly cloudy, highs in low to mid 80s, lows from upper 50s in Maryland to mid 60s in Virginia. Chance of showers in Virginia late today.

Lower Potomac and Chesapeake Bay: Today - Partly cloudy skies with visibility of 5 miles or more through tonight. Northeasterly winds of up to 14 knots today should diminish to near 8 knots tonight.

Extended Area Outlook: For Wednesday through Friday - Fair skies with highs in 80s, lows in 60s with gradual warming trend through period. Washington's normal temperatures for this time of year is from 85 to 65.

Atlantic Ocean Beaches from Cape May through Maryland: Today and Tuesday - Partly cloudy, highs in 70s. Water temperatures should range from near 60 north to mid 60s south.

Atlantic Ocean Beaches from Cape Hatteras through Virginia: Today and Tuesday - Partly cloudy, highs near 80. Water temperatures should range from mid 60s north to mid 70s south.

The National Weather Forecast for Today - Thundershowers will occur throughout the Mississippi Valley and throughout much of the southeastern U.S.Scattered showers are also possible in parts of the northern Rockies. Clear or partly cloudy skies will dominate the rest of the nation. Temperatures will reach the 90s across the southern part of the nation except along the southern California coast. Some spots in the desert southwest and southwest Texas will reach 100. Seventies and 80s will prevail in most other areas except for 60s along the Pacific Coast, western Great Lakes and extreme northern New England.

Almanac Data for Monday, June 13, 1977: Sun rises 5:42 a.m., sets 8:45 p.m.; moon rises 3:46 a.m.; sets 5:52 p.m. Tides: High 6:42 a.m. and 7:08 p.m. Low 1:29 a.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 (4); Norfolk (1 1/2); Virginia Beach (1); Solomons Island (6 1/2); Point Lookout (7).

The National Weather Service forecasts that the Potomac River stage at Little Falls will remain near 3.0 feet through tonight.

Washington data at 8 p.m. (EDT) yesterday: Highest temperature since 8 a.m. yesterday, 86 degrees at 2:25 p.m. Lowest temperature since midnight, 60 degrees at 7:15 a.m. Deficiency of temperatures since June 1, 26 degrees. Excess of temperature since Jan. 1, 182 degrees. Record high temperature for today, 96 degrees in 1954. Record low temperature for today, 51 degrees in 1887. Relative humidity: Maximum, 84 per cent at 6 a.m.; minimum, 32 per cent at 3 p.m. 24-hour precipitation, none. Deficiency of precipitation since June 1, .45 inches. Deficiency of precipitation since Jan. 1, 6.67 inches. Highest observed wind since 8 a.m., 9 miles per hour from the NNW at 3:53 a.m. No peak gust since 8 a.m. Local Temp., Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 mid.(COLUMN)73(COLUMN)52 1 a.m.(COLUMN)70(COLUMN)57 2 a.m.(COLUMN)70(COLUMN)57 3 a.m.(COLUMN)66(COLUMN)63 4 a.m.(COLUMN)64(COLUMN)75 5 a.m.(COLUMN)62(COLUMN)78 6 a.m.(COLUMN)61(COLUMN)84 7 a.m.(COLUMN)64(COLUMN)78 8 a.m.(COLUMN)68(COLUMN)68 9 a.m.(COLUMN)73(COLUMN)57 10 a.m.(COLUMN)77(COLUMN)52 11 a.m.(COLUMN)80(COLUMN)42 12 noon(COLUMN)82(COLUMN)38 1 p.m.(COLUMN)84(COLUMN)36 2 p.m.(COLUMN)84(COLUMN)35 3 p.m.(COLUMN)85(COLUMN)32 4 p.m.(COLUMN)85(COLUMN)35 5 p.m.(COLUMN)86(COLUMN)34 6 p.m.(COLUMN)82(COLUMN)43(END TABLE) Temperatures ending 8 a.m. (EDT) Yesterday(TABLE) City(COLUMN)Hi(COLUMN)Lo Albany(COLUMN)71(COLUMN)55 Albuquerque(COLUMN)86(COLUMN)57 Amarillo(COLUMN)96(COLUMN)64 Anchorage(COLUMN)69(COLUMN)55 Asheville(COLUMN)79(COLUMN)58 Atlanta(COLUMN)92(COLUMN)70 Atlantic City(COLUMN)74(COLUMN)59 Austin(COLUMN)90(COLUMN)73 Baltimore(COLUMN)82(COLUMN)55 Billings(COLUMN)69(COLUMN)50 Birmingham(COLUMN)98(COLUMN)71 Bismarck(COLUMN)67(COLUMN)50 Boise(COLUMN)74(COLUMN)55 Boston(COLUMN)61(COLUMN)59 Brownsville(COLUMN)94(COLUMN)75 Buffalo(COLUMN)74(COLUMN)57 Burlington, Vt.(COLUMN)64(COLUMN)55 Casper(COLUMN)83(COLUMN)53 Charleston, S.C.(COLUMN)88(COLUMN)74 Charleston, W.V.(COLUMN)71(COLUMN)57 Charlotte, N.C.(COLUMN)81(COLUMN)62 Cheyenne(COLUMN)70(COLUMN)47 Chicago(COLUMN)80(COLUMN)54 Cincinnati(COLUMN)79(COLUMN)57 Cleveland(COLUMN)75(COLUMN)55 Columbia, S.C.(COLUMN)90(COLUMN)63 Columbus, Ohio(COLUMN)62(COLUMN)55 Dal.-Ft. Worth(COLUMN)97(COLUMN)74 DaytoN(COLUMN)74(COLUMN)55 Denver(COLUMN)78(COLUMN)50 Des Moines(COLUMN)92(COLUMN)69 Detroit(COLUMN)64(COLUMN)57 Duluth(COLUMN)67(COLUMN)50 El Paso(COLUMN)99(COLUMN)63 Fairbank(COLUMN)78(COLUMN)56 Fargo(COLUMN)77(COLUMN)54 Flagstaff(COLUMN)76(COLUMN)36 Great Falls(COLUMN)57(COLUMN)48 Hartford(COLUMN)69(COLUMN)58 Helena(COLUMN)58(COLUMN)46 Honolulu(COLUMN)86(COLUMN)74 Houston(COLUMN)88(COLUMN)78 Indianapolis(COLUMN)86(COLUMN)65 Jackson, Miss.(COLUMN)96(COLUMN)73 Jacksonville(COLUMN)96(COLUMN)69 Juneau(COLUMN)59(COLUMN)50 Kansas City(COLUMN)90(COLUMN)66 Las Vegas(COLUMN)97(COLUMN)66 Little Rock(COLUMN)98(COLUMN)77 Los Angeles(COLUMN)73(COLUMN)57 Louisville(COLUMN)88(COLUMN)67 Memphis(COLUMN)99(COLUMN)75 Miami Beach(COLUMN)91(COLUMN)76 Midland(COLUMN)100(COLUMN)65 Milwaukee(COLUMN)46(COLUMN)50 Mpts.-St. Paul(COLUMN)75(COLUMN)56 Nashville(COLUMN)98(COLUMN)74 New Orleans(COLUMN)95(COLUMN)68 New York(COLUMN)72(COLUMN)62 Norfolk(COLUMN)30(COLUMN)58 North Platte(COLUMN)81(COLUMN)60 Oklahoma City(COLUMN)94(COLUMN)68 Omaha(COLUMN)83(COLUMN)66 Orlando(COLUMN)97(COLUMN)75 Philadelphia(COLUMN)77(COLUMN)59 Phoenix(COLUMN)97(COLUMN)73 Pittsburgh(COLUMN)74(COLUMN)46 Portland, Me.(COLUMN)57(COLUMN)49 Portland, Ore.(COLUMN)65(COLUMN)$54 Providence(COLUMN)61(COLUMN)55 Raleigh(COLUMN)80(COLUMN)61 Rapid City(COLUMN)75(COLUMN)60 Reno(COLUMN)78(COLUMN)49 Richmond(COLUMN)84(COLUMN)53 St. Louis(COLUMN)95(COLUMN)71 St. Prbg.-Tampa(COLUMN)92(COLUMN)78 Salt Lake City(COLUMN)84(COLUMN)52 San Antonio(COLUMN)92(COLUMN)76 San Diego(COLUMN)68(COLUMN)62 San Francisco(COLUMN)59(COLUMN)52 St. Ste. Marie(COLUMN)57(COLUMN)48 Seattle(COLUMN)67(COLUMN)51 Shreveport(COLUMN)94(COLUMN)68 Sioux Falls(COLUMN)88(COLUMN)59 Spokane(COLUMN)75(COLUMN)56 Syracuse(COLUMN)74(COLUMN)56 Topeka(COLUMN)93(COLUMN)66 Tucson(COLUMN)95(COLUMN)63 Tulsa(COLUMN)98(COLUMN)74 Washington(COLUMN)83(COLUMN)60 Wichita(COLUMN)100(COLUMN)68(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)57 Amsterdam(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)72 Ankara(COLUMN)pt. cldy.(COLUMN)3 p.m.(COLUMN)77 Athens(COLUMN)clear(COLUMN)2 p.m.(COLUMN)79 Auckland(COLUMN)cloudy(COLUMN)midnight(COLUMN)52 Berlin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)70 Birmingham(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)55 Brussels(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)73 Cairo(COLUMN)clear(COLUMN)2 p.m.(COLUMN)90 Casablanca(COLUMN)pt. cldy.(COLUMN)noon(COLUMN)70 Copenhagen(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)66 Dublin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)48 Geneva(COLUMN)clear(COLUMN)1 p.m.(COLUMN)68 Hong Kong(COLUMN)clear(COLUMN)8 p.m.(COLUMN)84 Lisbon(COLUMN)pt. cldy.(COLUMN)noon(COLUMN)64 London(COLUMN)rain(COLUMN)1 p.m.(COLUMN)59 Madrid(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)54 Malta(COLUMN)clear(COLUMN)1 p.m.(COLUMN)86 Manila(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)82 Moscow(COLUMN)cloudy(COLUMN)3 p.m.(COLUMN)73 New Delhi(COLUMN)cloudy(COLUMN)5 p.m.(COLUMN)93 Nice(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)72 Oslo(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)64 Paris(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)73 Peking(COLUMN)clear(COLUMN)8 p.m.(COLUMN)75 Rome(COLUMN)clear(COLUMN)1 p.m.(COLUMN)77 Saigon(COLUMN)pt. cldy.(COLUMN)8 p.m.(COLUMN)50 Sofia(COLUMN)storm(COLUMN)2 p.m.(COLUMN)75 Stockholm(COLUMN)clear(COLUMN)1 p.m.(COLUMN)81 Sydney(COLUMN)clear(COLUMN)10 p.m.(COLUMN)45 Tel Aviv(COLUMN)clear(COLUMN)2 p.m.(COLUMN)84 Tokyo(COLUMN)pt. cldy.(COLUMN)9 p.m.(COLUMN)73 Tunis(COLUMN)clear(COLUMN)1 p.m.(COLUMN)86 Vienna(COLUMN)clear(COLUMN)1 p.m.(COLUMN)81 Warsaw(COLUMN)clear(COLUMN)1 p.m.(COLUMN)79(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)H.(COLUMN)L. Acapulco(COLUMN)pt. cldy.(COLUMN)86(COLUMN)78 Barbados(COLUMN)pt. cldy.(COLUMN)86(COLUMN)78 Bermuda(COLUMN)fair(COLUMN)80(COLUMN)74 Bogota(COLUMN)cloudy(COLUMN)55(COLUMN)50 Calgary(COLUMN)pt. cldy.(COLUMN)66(COLUMN)39 Culiacan(COLUMN)fair(COLUMN)95(COLUMN)68 Edmonton(COLUMN)clear(COLUMN)64(COLUMN)37 Havana(COLUMN)pt. cldy.(COLUMN)86(COLUMN)77 Kingston(COLUMN)pt. cldy.(COLUMN)88(COLUMN)77 Montego Bay(COLUMN)pt. cldy.(COLUMN)88(COLUMN)77 Mexico City(COLUMN)haze(COLUMN)77(COLUMN)57 Monterrey(COLUMN)pt. cldy.(COLUMN)96(COLUMN)74 Montreal(COLUMN)rain(COLUMN)70(COLUMN)55 Nassau(COLUMN)pt. cldy.(COLUMN)86(COLUMN)72 Ottawa(COLUMN)cloudy(COLUMN)77(COLUMN)55 Regina(COLUMN)cloudy(COLUMN)63(COLUMN)50 St. Kitts(COLUMN)pt. cldy.(COLUMN)88(COLUMN)76 St. Thomas(COLUMN)pt. cldy.(COLUMN)88(COLUMN)78 Toronto(COLUMN)cloudy(COLUMN)79(COLUMN)57 Vancouver(COLUMN)pt. cldy.(COLUMN)68(COLUMN)50 Veracruz(COLUMN)pt. cldy.(COLUMN)88(COLUMN)74 Winnipeg(COLUMN)pt. cldy.(COLUMN)61(COLUMN)46(END TABLE)