Washington: Today - Mostly sunny and warm, high 84 to 88, low 64 to 72. Chance of rain is near zero through tonight. Winds will be southerly at 10 mph. Sunday - Mostly sunny, high in 80s.

Maryland and Virginia: Today - Partly sunny, high in 80s to low 90s, lows in 60s to low 70s. Sunday - Mostly sunny, high in 80s.

Lower Potomac and Chesapeake Bay: Today - Variable cloudness, visibility more than five miles. Winds will be southeasterly at 10 knots: Waves in unprotected waters will be one foot.

Atlantic Ocean Beaches from New Jersey to North Carolina: Today and Sunday - Variable cloudness, high in low 70s to around 80. Water temperatures will be in mid 70s in the north and mild to upper 70s in south.

Extended Area Outlook fo Monday through Wednesday: Partly cloudy and warm with a chance of showers on Monday. Highs will be in the 80s to low 90s and lows from the 60s to low 70s. Fair and cooler weather should prevail on Tuesday and Wednesday with highs ranging from the 70s to low 80s and lows from the 50s to low 60s. Normal Washington temperatures or the period will be a high of 81 and a low of 62.

Pollen Count: 69 (ragweed) (a reading of more than 7 is considerable to be undesirable).

The Nation Yesterday: A welcome surge of cooler air was slowly spreading across the north central part of the nation, bringing an end to the hot spell that began the first of the month. Temperatures in southeastern Montana and central Wyoming were only in the 60s and 70s, concerned to readings near 100 on Thursday. Farther west it was even cooler with showers present as well. Mid-day temperatures were mostly in the 50s from the northern Rockies westward to the northern Pacific coast. The cooler air is expected to continued sliding slowly southeastward the next two days. However, ahead of the advancing cool air it was another unseasonably hot day, with 60s reaching into eastern North Dakota, southern Minnesota and the southern section of the Great Lakes region. Warm humid conditions extended to the middle and south Atlantic Coast. Much cooler weather was located north of a stationary front in the northern Great Lakes region and northern Atlantic states. Many afternoon temperatures were only in the 60s in these areas. Drizzle was falling the northern Michigan, and rain dampened parts of New York, Pennsylvania and New Jersey. Relatively cool temperatures in the 20s were also noted in parts of the southern Plains due to widespread cloudiness and scattered areas of showers and thunderstorms. A report in the Texas panhandle, remained in the 60s. The National Weather Forecast for today: Very warm weather will continue from the Mississippi Valley to the south Atlantic Coast, but cooler temperatures will move into the northern Plains. The western third of the nation and the north Atlantic states will remain cool, and the south central U.S. warm. Showers will occur from the lower Great Lakes to southern New England, and thundershowers will be scattered over the upper Mississippi Valley. There will also be some scattered showers and thundershowers along the western Gulf Coast, and some rain along the north Pacific Coast.

Almanac Data for today: The sun rise 6:44 a.m., sets 7:26 p.m.; moon rise 12:25 p.m., sets 11:00 p.m. Tides: high 12:00 a.m. and 12:33 p.m., low 5:13 a.m. and 6:03 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 (1/4), 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 2 to 3 p.m. period was 90 for the pollutant, photochemical oxidants. Index values between 50 and 99 indicate unhealthy 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 forecast for today indicates that the air quality will improve.

The National Weather Service forecasters the Potomac River Stage at Little Falls should remain near 3.1 feet today. Local Temps., Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 midnight(COLUMN)82(COLUMN)55 1 a.m.(COLUMN)81(COLUMN)57 2 a.m.(COLUMN)80(COLUMN)58 3 a.m.(COLUMN)79(COLUMN)60 4 a.m.(COLUMN)79(COLUMN)60 5 a.m.(COLUMN)77(COLUMN)64 6 a.m.(COLUMN)76(COLUMN)67 7 a.m.(COLUMN)75(COLUMN)69 8 a.m.(COLUMN)75(COLUMN)69 9 a.m.(COLUMN)76(COLUMN)67 10 a.m.(COLUMN)76(COLUMN)67 11 a.m.(COLUMN)78(COLUMN)70 12 noon(COLUMN)81(COLUMN)69 1 p.m.(COLUMN)81(COLUMN)64 2 p.m.(COLUMN)85(COLUMN)58 3 p.m.(COLUMN)83(COLUMN)56 4 p.m.(COLUMN)86(COLUMN)64 5 p.m.(COLUMN)87(COLUMN)61 6 p.m.(COLUMN)86(COLUMN)66 7 p.m.(COLUMN)84(COLUMN)70(END TABLE) Temperatures ending 8 a.m. (EDT) yesterday:(TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)77(COLUMN)34 Albuquerque(COLUMN)86(COLUMN)42 Amarillo(COLUMN)86(COLUMN)62 Anchorage(COLUMN)59(COLUMN)52 Asheville(COLUMN)87(COLUMN)56 Atlanta(COLUMN)91(COLUMN)67 Atlantic City(COLUMN)85(COLUMN)66 Austin(COLUMN)86(COLUMN)72 Baltimore(COLUMN)90(COLUMN)68 Billings(COLUMN)88(COLUMN)59 Birmingham(COLUMN)92(COLUMN)64 Bismarck(COLUMN)91(COLUMN)65 Boise(COLUMN)57(COLUMN)44 Boston(COLUMN)79(COLUMN)48 Brownsville(COLUMN)88(COLUMN)76 Buffalo(COLUMN)75(COLUMN)50 Burlington(COLUMN)70(COLUMN)37 Casper(COLUMN)94(COLUMN)54 Charleston S.C.(COLUMN)88(COLUMN)74 Charleston W.V.(COLUMN)85(COLUMN)64 Charlotte(COLUMN)90(COLUMN)67 Cheyenne(COLUMN)85(COLUMN)54 Chicago(COLUMN)91(COLUMN)68 Cincinatti(COLUMN)86(COLUMN)61 Cleveland(COLUMN)88(COLUMN)65 Columbia, S.C.(COLUMN)84(COLUMN)79 Columbus(COLUMN)87(COLUMN)63 Dal-Ft. Worth(COLUMN)95(COLUMN)72 Dayton(COLUMN)85(COLUMN)64 Denver(COLUMN)91(COLUMN)58 Des Moines(COLUMN)97(COLUMN)69 Detroit(COLUMN)94(COLUMN)65 Duluth(COLUMN)62(COLUMN)53 El Paso(COLUMN)81(COLUMN)61 Fairbanks(COLUMN)61(COLUMN)46 Fargo(COLUMN)87(COLUMN)64 Flagstaff(COLUMN)75(COLUMN)45 Great Falls(COLUMN)81(COLUMN)58 Hartford(COLUMN)77(COLUMN)40 Helena(COLUMN)88(COLUMN)55 Honolulu(COLUMN)88(COLUMN)75 Houston(COLUMN)79(COLUMN)77 Indianapolis(COLUMN)87(COLUMN)62 Jackson, Miss.(COLUMN)91(COLUMN)61 Jacksonville(COLUMN)88(COLUMN)66 Juneau(COLUMN)65(COLUMN)46 Kansas City(COLUMN)97(COLUMN)69 Las Vegas(COLUMN)89(COLUMN)61 Little Rock(COLUMN)90(COLUMN)70 Los Angeles(COLUMN)75(COLUMN)60 Louisville(COLUMN)90(COLUMN)67 Memphis(COLUMN)92(COLUMN)72 Miami Beach(COLUMN)84(COLUMN)78 Midland-Odessa(COLUMN)74(COLUMN)43 Milwaukee(COLUMN)90(COLUMN)71 Mpls.-St. Paul(COLUMN)96(COLUMN)67 Nashville(COLUMN)92(COLUMN)63 New Orleans(COLUMN)89(COLUMN)72 New York(COLUMN)84(COLUMN)54 Norfolk(COLUMN)93(COLUMN)71 North Plains(COLUMN)64(COLUMN)99 Oklahoma City(COLUMN)95(COLUMN)69 Omaha(COLUMN)95(COLUMN)73 Orlando(COLUMN)92(COLUMN)75 Philadelphia(COLUMN)91(COLUMN)66 Phoenix(COLUMN)102(COLUMN)80 Pittsburgh(COLUMN)84(COLUMN)66 Portland, Ma.(COLUMN)75(COLUMN)48 Portland, Ore.(COLUMN)64(COLUMN)51 Providence(COLUMN)76(COLUMN)45 Raleigh(COLUMN)93(COLUMN)68 Rapid City(COLUMN)99(COLUMN)66 Reno(COLUMN)64(COLUMN)34 Richmond(COLUMN)96(COLUMN)71 St. Louis(COLUMN)93(COLUMN)45 St. Prbg.-Tampa(COLUMN)89(COLUMN)74 Salt Lake City(COLUMN)91(COLUMN)48 San Antonio(COLUMN)83(COLUMN)71 San Diego(COLUMN)74(COLUMN)64 San Francisco(COLUMN)65(COLUMN)56 St. Ste. Marie(COLUMN)65(COLUMN)52 Seattle(COLUMN)67(COLUMN)51 Shreveport(COLUMN)92(COLUMN)67 Sioux Falls(COLUMN)94(COLUMN)71 Spokane(COLUMN)57(COLUMN)48 Syracuse(COLUMN)78(COLUMN)42 Topeka(COLUMN)98(COLUMN)44 Tucson(COLUMN)94(COLUMN)72 Tulsa(COLUMN)97(COLUMN)72 Washington(COLUMN)93(COLUMN)75 Wichita(COLUMN)97(COLUMN)65(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)57 Amsterdam(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)64 Ankara(COLUMN)pt. cldy(COLUMN)3 p.m.(COLUMN)75 Athens(COLUMN)pt. cldy(COLUMN)2 p.m.(COLUMN)86 Auckland(COLUMN)cloudy(COLUMN)12 a.m.(COLUMN)52 Berlin(COLUMN)clear(COLUMN)1 p.m.(COLUMN)63 Birmingham(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)64 Bonn(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)68 Brussels(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)66 Casablanca(COLUMN)clear(COLUMN)12 p.m.(COLUMN)79 Copenhagen(COLUMN)clear(COLUMN)1 p.m.(COLUMN)59 Dublin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)64 Geneva(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)72 Hong Kong(COLUMN)clear(COLUMN)8 p.m.(COLUMN)82 Jerusalem(COLUMN)clear(COLUMN)2 p.m.(COLUMN)97 Lisbon(COLUMN)clear(COLUMN)12 p.m.(COLUMN)82 London(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)64 Madrid(COLUMN)clear(COLUMN)1 p.m.(COLUMN)84 Malta(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)79 Manila(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)77 Moscow(COLUMN)cloudy(COLUMN)3 p.m.(COLUMN)54 New Delhi(COLUMN)clear(COLUMN)5 p.m.(COLUMN)90 Nice(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)75 Oslo(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)54 Paris(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)66 Peking(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)64 Rome(COLUMN)clear(COLUMN)1 p.m.(COLUMN)77 Sofia(COLUMN)cloudy(COLUMN)2 p.m.(COLUMN)59 Stockholm(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)59 Sydney(COLUMN)clear(COLUMN)10 p.m.(COLUMN)54 Tokyo(COLUMN)clear(COLUMN)9 p.m.(COLUMN)72 Tunis(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)63 Vienna(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)68 Warsaw(COLUMN)rain(COLUMN)1 p.m.(COLUMN)56(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)cloudy(COLUMN)86(COLUMN)77 Barbados(COLUMN)fair(COLUMN)86(COLUMN)73 Bermuda(COLUMN)cloudy(COLUMN)85(COLUMN)74 Calgary(COLUMN)rain(COLUMN)68(COLUMN)52 Culiacan(COLUMN)cloudy(COLUMN)86(COLUMN)73 Edmonton(COLUMN)cloudy(COLUMN)63(COLUMN)54 Kingston(COLUMN)pt. cldy(COLUMN)91(COLUMN)77 Montego Bay(COLUMN)pt. cldy(COLUMN)88(COLUMN)77 Mexico City(COLUMN)cloudy(COLUMN)73(COLUMN)59 Monterrey(COLUMN)cloudy(COLUMN)77(COLUMN)73 Montreal(COLUMN)cloudy(COLUMN)68(COLUMN)39 Ottawa(COLUMN)pt. cldy(COLUMN)46(COLUMN)45 Regina(COLUMN)rain(COLUMN)81(COLUMN)61 St. Kitts(COLUMN)pt. cldy(COLUMN)88(COLUMN)73 Toronto(COLUMN)cloudy(COLUMN)73(COLUMN)56 Vancouver(COLUMN)clear(COLUMN)63(COLUMN)48 Veracruz(COLUMN)cloudy(COLUMN)88(COLUMN)77 Winnipeg(COLUMN)cloudy(COLUMN)73(COLUMN)61(END TABLE)