Washington: Today - Cloudy with showers or thunderstorms; high in low 80s, low in mid 60s. Chance of rain is 80 percent through tonight. Winds will be southeasterly at 15 mph. Monday - Humid with variable cloudiness and a chance of evening thundershowers; high in 90s.

Maryland and Virginia: Today - Cloudy with a chance of thundershowers, high in 80s, low in 60s. Monday - Humid with thunderstorms, high in 80s.

Lower Potomac and Chesapeake Bay: Today - Fair, visibility more than five miles. There will be a chance of thundershowers through tonight. Winds will be easterly at 18 knots. Waves in unprotected waters will be 2 feet.

Atlantic Ocean Beaches from New Jersey to North Carolina: Today - Cloudy with thunderstorms; high in 80s. Monday - Variable cloudiness with a chance of thunderstorms, high in low 80s. Water temperatures will be in upper 60s in north and 70s in south.

Extended Area Outlook for Tuesday through Thursday: Considerable cloudness through the period with a chance of showers at times. Highs will average from the mid 70s to mid 80s, lows in the 70s Normal Washington temperatures for the period will be a high of 88 and a low of 68.

The National Weather Forecast for today - Showers and [WORD ILLEGIBLE] thundershowers will reach from the Oregon coast through the upper intermountain region, across the northern Rockies and the northern Plains. Showers and occasional thunderstorms will reach from the Gulf states to the Great Lakes and the Atlantic Coast to New England. Temperatures will be mild over New England across the lower and central Great Lakes and through the northern Atlantic Coastal states, as well as from the northern Rockies across the northern Intermountain region and the northern half of the Pacific coast. Temperatures elsewhere over the nation will remain generally warm and occasionally hot.

Almanac Data for today: The sun rises 5:47 a.m., sets 8:37 p.m.; moon rises 3:52 a.m., sets 6:15 p.m. Tides: high 6:55 a.m. and 7:24 p.m., low 1:40 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 in the high reading in the Washington area during the 12 to 1 p.m. period was 36 for the pollutant, photochemical oxidants. Index values between 0 and 49 indicates fair 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 remain near 3.6 feet today. Local Temp., Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 midnite(COLUMN)78(COLUMN)62 1 a.m.(COLUMN)77(COLUMN)64 2 a.m.(COLUMN)77(COLUMN)54 3 a.m.(COLUMN)75(COLUMN)56 4 a.m.(COLUMN)74(COLUMN)50 5 a.m.(COLUMN)72(COLUMN)46 6 a.m.(COLUMN)71(COLUMN)42 7 a.m.(COLUMN)71(COLUMN)44 8 a.m.(COLUMN)73(COLUMN)38 9 a.m.(COLUMN)75(COLUMN)34 10 a.m.(COLUMN)76(COLUMN)35 11 a.m.(COLUMN)78(COLUMN)35 12 noon(COLUMN)80(COLUMN)32 1 p.m.(COLUMN)81(COLUMN)30 2 p.m.(COLUMN)82(COLUMN)32 3 p.m.(COLUMN)84(COLUMN)32 4 p.m.(COLUMN)86(COLUMN)31 5 p.m.(COLUMN)84(COLUMN)33 6 p.m.(COLUMN)81(COLUMN)35(END TABLE) Temperatures ending 8 a.m. (EDT) yesterday:(TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)77(COLUMN)50 Albuquerque(COLUMN)91(COLUMN)63 Amarillo(COLUMN)89(COLUMN)65 Anchorage(COLUMN)56(COLUMN)51 Asheville(COLUMN)91(COLUMN)64 Atlanta(COLUMN)95(COLUMN)70 Atlantic City(COLUMN)83(COLUMN)58 Austin(COLUMN)96(COLUMN)73 Baltimore(COLUMN)91(COLUMN)63 Billings(COLUMN)90(COLUMN)55 Birmingham(COLUMN)97(COLUMN)75 Bismarck(COLUMN)80(COLUMN)64 Boise(COLUMN)84(COLUMN)54 Boston(COLUMN)81(COLUMN)60 Brownsville(COLUMN)96(COLUMN)76 Buffalo(COLUMN)76(COLUMN)50 Burlington(COLUMN)68(COLUMN)44 Casper(COLUMN)87(COLUMN)55 Charleston, S.C.(COLUMN)94(COLUMN)80 Charleston, W.Va.(COLUMN)90(COLUMN)63 Charlotte(COLUMN)94(COLUMN)71 Cheyenne(COLUMN)76(COLUMN)54 Chicago(COLUMN)85(COLUMN)71 Cincinnati(COLUMN)90(COLUMN)70 Cleveland(COLUMN)82(COLUMN)67 Columbia, S.C.(COLUMN)99(COLUMN)70 Columbus(COLUMN)87(COLUMN)65 Dal.-Ft. Worth(COLUMN)98(COLUMN)75 Dayton(COLUMN)91(COLUMN)70 Denver(COLUMN)84(COLUMN)58 Des Moines(COLUMN)93(COLUMN)79 Detroit(COLUMN)90(COLUMN)63 Duluth(COLUMN)66(COLUMN)59 El Paso(COLUMN)87(COLUMN)68 Fairbanks(COLUMN)62(COLUMN)48 Fargo(COLUMN)71(COLUMN)65 Flagstaff(COLUMN)80(COLUMN)39 Great Falls(COLUMN)83(COLUMN)53 Hartford(COLUMN)85(COLUMN)55 Helena(COLUMN)84(COLUMN)48 Honolulu(COLUMN)86(COLUMN)73 Houston(COLUMN)93(COLUMN)79 Indianapolis(COLUMN)93(COLUMN)73 Jackson, Miss.(COLUMN)97(COLUMN)74 Jacksonville(COLUMN)96(COLUMN)76 Juneau(COLUMN)53(COLUMN)46 Kansas City(COLUMN)96(COLUMN)73 Las Vegas(COLUMN)103(COLUMN)76 Little Rock(COLUMN)95(COLUMN)74 Los Angeles(COLUMN)80(COLUMN)62 Louisville(COLUMN)94(COLUMN)74 Memphis(COLUMN)98(COLUMN)80 Miami Beach(COLUMN)87(COLUMN)80 Midland-Odessa(COLUMN)82(COLUMN)68 Milwaukee(COLUMN)74(COLUMN)63 Mpls-St. Paul(COLUMN)83(COLUMN)70 Nashville(COLUMN)94(COLUMN)74 New Orleans(COLUMN)91(COLUMN)73 New York(COLUMN)87(COLUMN)61 Norfolk(COLUMN)89(COLUMN)73 North Platte(COLUMN)96(COLUMN)61 Oklahoma City(COLUMN)94(COLUMN)75 Omaha(COLUMN)95(COLUMN)75 Orlando(COLUMN)95(COLUMN)75 Philadelphia(COLUMN)90(COLUMN)60 Phoenix(COLUMN)154(COLUMN)74 Pittsburgh(COLUMN)86(COLUMN)63 Portland, Maine(COLUMN)78(COLUMN)50 Portland, Ore.(COLUMN)76(COLUMN)60 Province(COLUMN)82(COLUMN)58 Raleigh(COLUMN)95(COLUMN)69 Rapid City(COLUMN)83(COLUMN)61 Reno(COLUMN)83(COLUMN)46 Richmond(COLUMN)84(COLUMN)70 St. Louis(COLUMN)95(COLUMN)75 St. Prbg.-Tampa(COLUMN)92(COLUMN)77 Salt Lake City(COLUMN)92(COLUMN)65 San Antonio(COLUMN)94(COLUMN)73 San Diego(COLUMN)76(COLUMN)65 San Francisco(COLUMN)66(COLUMN)56 San Juan(COLUMN)94(COLUMN)76 St. Ste. Marie(COLUMN)75(COLUMN)54 Seattle(COLUMN)75(COLUMN)58 Shreveport(COLUMN)98(COLUMN)70 Sioux Falls(COLUMN)92(COLUMN)66 Spokane(COLUMN)76(COLUMN)54 Syracuse(COLUMN)75(COLUMN)54 Topeka(COLUMN)93(COLUMN)75 Tucson(COLUMN)99(COLUMN)68 Tulsa(COLUMN)96(COLUMN)78 Washington(COLUMN)93(COLUMN)70 Wichita(COLUMN)101(COLUMN)77(END TABLE)(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)63 Amsterdam(COLUMN)clear(COLUMN)1 p.m.(COLUMN)61 Ankara(COLUMN)cloudy(COLUMN)3 p.m.(COLUMN)59 Athens(COLUMN)clear(COLUMN)2 p.m.(COLUMN)79 Auckland(COLUMN)clear(COLUMN)12 p.m.(COLUMN)41 Berlin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)66 Birmingham(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)55 Bonn(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)63 Brussels(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)64 Casablanca(COLUMN)cloudy(COLUMN)12 p.m.(COLUMN)70 Copenhagen(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)61 Dublin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)61 Geneva(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)66 Hong Kong(COLUMN)clear(COLUMN)8 p.m.(COLUMN)84 Jerusalem(COLUMN)clear(COLUMN)2 p.m.(COLUMN)75 Lisbon(COLUMN)clear(COLUMN)12 p.m.(COLUMN)75 London(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)64 Madrid(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)72 Malta(COLUMN)clear(COLUMN)1 p.m.(COLUMN)79 Manila(COLUMN)pt. cldy.(COLUMN)8 p.m.(COLUMN)82 Moscow(COLUMN)cloudy(COLUMN)3 p.m.(COLUMN)64 New Delhi(COLUMN)pt. cldy.(COLUMN)5 p.m.(COLUMN)93 Nice(COLUMN)rain(COLUMN)1 p.m.(COLUMN)63 Oslo(COLUMN)rain(COLUMN)1 p.m.(COLUMN)57 Paris(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)66 Peking(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)82 Rome(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)73 Saigon(COLUMN)rain(COLUMN)8 p.m.(COLUMN)75 Sofia(COLUMN)clear(COLUMN)2 p.m.(COLUMN)73 Stockholm(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)63 Sydney(COLUMN)pt. cldy.(COLUMN)10 p.m.(COLUMN)55 Tokyo(COLUMN)cloudy(COLUMN)9 p.m.(COLUMN)73 Tunis(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)81 Vienna(COLUMN)haze(COLUMN)1 p.m.(COLUMN)70 Warsaw(COLUMN)clear(COLUMN)1 p.m.(COLUMN)75(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)cloudy(COLUMN)86(COLUMN)75 Barbados(COLUMN)fair(COLUMN)86(COLUMN)75 Bermuda(COLUMN)cloudy(COLUMN)81(COLUMN)76 Bogota(COLUMN)pt. cldy.(COLUMN)64(COLUMN)48 Calgary(COLUMN)cloudy(COLUMN)79(COLUMN)57 Edmonton(COLUMN)cloudy(COLUMN)79(COLUMN)54 Havana(COLUMN)pt. cldy.(COLUMN)86(COLUMN)77 Kingston(COLUMN)rain(COLUMN)93(COLUMN)80 Montego Bay(COLUMN)pt. cldy.(COLUMN)88(COLUMN)75 Mexico City(COLUMN)pt. cldy.(COLUMN)74(COLUMN)57 Monterrey(COLUMN)cloudy(COLUMN)95(COLUMN)73 Montreal(COLUMN)clear(COLUMN)73(COLUMN)46 Nassau(COLUMN)pt. cldy.(COLUMN)90(COLUMN)73 Ottawa(COLUMN)clear(COLUMN)73(COLUMN)52 Regina(COLUMN)cloudy(COLUMN)84(COLUMN)61 St. Kitts(COLUMN)cloudy(COLUMN)93(COLUMN)77 St. Thomas(COLUMN)pt. cldy.(COLUMN)90(COLUMN)78 Toronto(COLUMN)cloudy(COLUMN)77(COLUMN)46 Vancouver(COLUMN)cloudy(COLUMN)70(COLUMN)54 Veracruz(COLUMN)cloudy(COLUMN)80(COLUMN)75 Winnipeg(COLUMN)pt. cldy.(COLUMN)86(COLUMN)64(END TABLE)