Washington: Today - Partly cloudy, high in low to mid 60s, lows in mid to upper 60s. Chance of rain is 30 per cent through tonight. Monday - Partly cloudy, highs in low to mid 80s.

Maryland and Virginia: Today - Partly cloudy, highs in 80s, lows in 60s. Chance of afternoon and evening showers. Monday - Partly cloudy with chance of rain, highs in 80s.

Lower Potomac and Chesapeake Bay: Today - Chance of rain, especially in afternoon and evening, with poor visibility and southeastery winds at 10 to 15 knots through tonight.

Extended Area Outlook: For Tuesday through Thursday - Partly cloudy skies with chance of rain each day. Highs should be in mid 70s to mid 80s, lows in mid 50s at 11:53 a.m. Peak oust since 8 temperature range for this time of year is from 76 to 57.

West Virginia: Today - Cloudy with chance of rain, highs in 70s, lows in upper 50s to mid 60s. Monday - Cloudy with chance of rain, highs in 70s.

The Nation yesterday: Flash flood warnings were in effect in several counties of western and southern New York last night. Between 1 and 2 inches of rain on already saturated ground produced street flooding in a number of places, with reported depths of 1 to 2 feet.

Flash flood watches continued for portions of eastern and southern New York, northwestern and northeastern Pennsylvania with heavy rain expected last night and today. Rain and showers have occurred from Minnesota eastward into southern New England yesterday afternoon north of a frontal boundary. Precipitation was falling in Washington and intermittently in the northern Rockies and in North Dakota. Most has been rain, but snow has fallen at higher elevations. Yellowstone Park reported heavy snow accumulating yesterday afternoon with some passes closed due to snow and ice. Winds has been a problem in northern Michigan. Winds of up to 70 miles per hour were reported by the Michigan State Police on the Mackinac Bridge between lower and Upper Michigan. While temperatures in the northwest have been cool the last few days, residents of southwest Texas have experienced record-breaking east and Great Lakes region were held in the 50s and 60s yesterday, as were parts of the parts of the northwest. Temperatures in the 70s and 80s were common in the South and West, with 90s in Texas and the western deserts.

The National Weather Forecast for Today - Rain will fall from northeastern Minnesota across northern Michigan into New York, northern Pennsylvania and Southern New England. Rain may be heavy at times in eastern New York and northeastern Pennyslvania. Showers and thunderstorms will be scattered from the middle Atlantic states through the southern half of the Ohio Valley into the lower Mississippi Valley. Showers will occur along the coastal portions of washington and Oregon and will be scattered from there into the northern Rockies and North Dakota. Showers will fall as snow at higher mountain elevations. Cool weather will continue from the Pacific Northwest across the northern Rockies into the upper Mississippi Valley and in northern New England. Warm temperatures will be felt from Texas through the central Plains across the Gulf Coast into the mid Atlantic Coastal sections. Mild readings will prevail elsewhere.

The Council of Governments' Air Quality Index for yesterday showed the high reading in the Washington area during the noon to 1 p.m. period was 31 for the polutant, photochemical oxidants. Index values between 25 and 49 indicate fair air quality. When the index exceeds 110 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 remain about the same.

The National Weather Service forecasts the Potomac River stage at Little Falls should remain near 2.7 feet through today.

ALMANAC DATA FOR Sun., Sept. 25, 1977. Sun rises 6:53 a.m., sets 7:01 p.m.; Moon rises 7:03 p.m., sets 5:08 a.m. Tides: High 7:21 a.m. and 7:51 p.m., low 12:31 a.m. and 1:57 p.m. High and low tides at the following locations can be obtained by subtracting the hours indicated from the tides above. Annapolis (1 1/2); Bloody Point Lighthouse (4 1/2); Deale, Md. (4 1/2); Colonial Beach (6); Norfolk (1 1/2); Virginia Beach (1); Solomons Islands (6 1/2); Point Lookout (7).

Washington data at 8 p.m. (EDI) yesterday: Highest temperature since 8 a.m. yesterday, 81 degrees at 3:30 p.m. Lowest temperature since midnight, 68 degrees at 5:25 a.m. Excess of temperature since Jan. 1, 419 degrees. Record high temperatures for today, 95 degrees in 1930.Record low temperature for today, 39 degrees in 1963. Relative humidity: Maximum, 97 per cent at 7 a.m.; minimum, 67 per cent at 4 p.m. 24-hour precipitation, trace. Deficiency of precipitation since Sept. 1, 2.29 inches. Deficiency of precipitation since Jan. 1, 8.70 inches. Highest observed wind since 8 a.m., 10 miles per hour from the south at 10.53 a.m. Peak gust since 8 a.m., 15 miles Per hour from the SE at 929 p.m. Local Temp. Humidity(TABLE) Time(COLUMN)T.THH. 12 midn(COLUMN)71(COLUMN)84 1 a.m.(COLUMN)70(COLUMN)84 2 a.m.(COLUMN)70(COLUMN)84 3 a.m.(COLUMN)69(COLUMN)90 4 a.m.(COLUMN)70(COLUMN)86(KEY OFF) 5 a.m. 69(COLUMN)90 6 a.m.(COLUMN)68(COLUMN)93 7 a.m.(COLUMN)68(COLUMN)97 8 a.m.(COLUMN)69(COLUMN)93 9 a.m.(COLUMN)71(COLUMN)87 10 a.m.(COLUMN)74(COLUMN)79 11 a.m.(COLUMN)76(COLUMN)74$12 noon 77(COLUMN)74 1 p.m.(COLUMN)79(COLUMN)69 2 p.m.(COLUMN)79(COLUMN)72 3 p.m.(COLUMN)80(COLUMN)69 4 p.m.(COLUMN)80(COLUMN)67 5 p.m.(COLUMN)80(COLUMN)69 6 p.m.(COLUMN)80(COLUMN)72 7 p.m.(COLUMN)78(COLUMN)77 8 p.m.(COLUMN)78(COLUMN)79 9 p.m.(COLUMN)77(COLUMN)79 10 p.m.(COLUMN)77(COLUMN)82 11 p.m.(COLUMN)76(COLUMN)85(END TABLE) Temperatures ending 8 p.m. (EDT) yesterday(TABLE) $ City(COLUMN)L.(COLUMN)H. Albany(COLUMN)50(COLUMN)55 Albuquerque(COLUMN)49(COLUMN)84 Amarillo(COLUMN)47(COLUMN)90 Anchorage(COLUMN)35(COLUMN)54 Asheville(COLUMN)60(COLUMN)79 Atlanta(COLUMN)62(COLUMN)81 Atlantic City(COLUMN)68(COLUMN)74 Austin(COLUMN)78(COLUMN)95 Baltimore(COLUMN)60(COLUMN)79 Billings(COLUMN)39(COLUMN)67 Birmingham(COLUMN)70(COLUMN)82 Bismarch(COLUMN)52(COLUMN)57 Boise(COLUMN)28(COLUMN)63 Boston(COLUMN)54(COLUMN)56 Brownsville(COLUMN)77(COLUMN)95 Buffalo(COLUMN)53(COLUMN)62 Burlington, Vt.(COLUMN)51(COLUMN)57 Casper(COLUMN)39(COLUMN)71 Charleston, S.C.(COLUMN)70(COLUMN)84 Charleston, W.Va.(COLUMN)64(COLUMN)77 Charlotte, N.C.(COLUMN)62(COLUMN)81 Cheyenne(COLUMN)41(COLUMN)74 Chicago(COLUMN)64(COLUMN)75 Cincinnati(COLUMN)67(COLUMN)75 Cleveland(COLUMN)62(COLUMN)79 Columbia, S.C.(COLUMN)55(COLUMN)86 Columbus, Ohio.(COLUMN)66(COLUMN)76 Dal. Ft. Worth(COLUMN)76(COLUMN)98 Dayton(COLUMN)66(COLUMN)76 Denver(COLUMN)42(COLUMN)85 Des Moines(COLUMN)53(COLUMN)73 Detroit(COLUMN)595(COLUMN)73 Duluth(COLUMN)50(COLUMN)51 El Paso(COLUMN)67(COLUMN)93 Fairbanks(COLUMN)36(COLUMN)49 Fargo(COLUMN)54(COLUMN)64 Flagstaff(COLUMN)48(COLUMN)76 Great Falls(COLUMN)48(COLUMN)56 Hartford(COLUMN)50(COLUMN)53 Helena(COLUMN)45(COLUMN)60 Honolulu(COLUMN)74(COLUMN)88 Houston(COLUMN)77(COLUMN)92 Indianapolis(COLUMN)68(COLUMN)76 Jackson, Miss.(COLUMN)68(COLUMN)89 Jacksonville(COLUMN)67(COLUMN)87 Juneau(COLUMN)34(COLUMN)58 Kansas City(COLUMN)53(COLUMN)77 Las Vegas(COLUMN)59(COLUMN)93 Little Rock(COLUMN)69(COLUMN)80 Los Angeles(COLUMN)60(COLUMN)86 Louisville(COLUMN)69(COLUMN)76 Memphis(COLUMN)68(COLUMN)75 Miami Beach(COLUMN)76(COLUMN)86 Midland(COLUMN)73(COLUMN)101 Milwaukee(COLUMN)60(COLUMN)73 Mols. St. Paul(COLUMN)51(COLUMN)63 Nashville(COLUMN)70(COLUMN)77 New Orleans(COLUMN)70(COLUMN)90 New York(COLUMN)55(COLUMN)62 Norfolk(COLUMN)62(COLUMN)85 North Platte(COLUMN)32(COLUMN)81 Oklahoma City(COLUMN)64(COLUMN)89 Omaha(COLUMN)49(COLUMN)74 Orlando(COLUMN)74(COLUMN)90 Philadelphia(COLUMN)62(COLUMN)73 Phoenix(COLUMN)76(COLUMN)98 Pittsburgh(COLUMN)58(COLUMN)71 Portland, Me.(COLUMN)49(COLUMN)56 Portland, Ore.(COLUMN)49(COLUMN)62 Providence(COLUMN)49(COLUMN)55 Raleigh(COLUMN)56(COLUMN)82 Rapid City(COLUMN)538(COLUMN)68 Reno(COLUMN)53(COLUMN)80 Richmond(COLUMN)61(COLUMN)85 St. Louis(COLUMN)64(COLUMN)79 St. Prbg.-Tam.(COLUMN)74(COLUMN)90 Salt Lake City(COLUMN)53(COLUMN)75 San Antonio(COLUMN)76(COLUMN)94 San Diego(COLUMN)65(COLUMN)80 San Francisco(COLUMN)58(COLUMN)65 San Juan, P.R.(COLUMN)76(COLUMN)87 St. Ste. Marie(COLUMN)47(COLUMN)60 Seattle(COLUMN)51(COLUMN)62 Shreveport(COLUMN)74(COLUMN)92 Stoux Falls(COLUMN)53(COLUMN)63 Spokane(COLUMN)46(COLUMN)54 Syracuse(COLUMN)55(COLUMN)61 Topeka(COLUMN)52(COLUMN)83 Tucson(COLUMN)69(COLUMN)95 Tulsa(COLUMN)65(COLUMN)82 Washington(COLUMN)68(COLUMN)81 Wichita(COLUMN)54(COLUMN)82(END TABLE) Temperatures Abroad Yesterday(TABLE) $ City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)55 Amsterdam(COLUMN)clear(COLUMN)1 p.m.(COLUMN)64 Ankara(COLUMN)clear(COLUMN)3 p.m.(COLUMN)79 Athens(COLUMN)clear(COLUMN)2 p.m.(COLUMN)79 Auckland(COLUMN)pt. cldy.(COLUMN)Midnight(COLUMN)48 Berlin(COLUMN)clear(COLUMN)1 p.m.(COLUMN)55 Birmingham(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)59 Brussels(COLUMN)clear(COLUMN)1 p.m.(COLUMN)63 Cairo(COLUMN)clear(COLUMN)2 p.m.(COLUMN)93 Casablanca(COLUMN)pt. cldy.(COLUMN)noon(COLUMN)72 Copenhagen(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)61 Dublin(COLUMN)drizzle(COLUMN)1 p.m.(COLUMN)54 Geneva(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)54 Hong Kong(COLUMN)rain(COLUMN)8 p.m.(COLUMN)81 Lisbon(COLUMN)pt. cldy.(COLUMN)noon(COLUMN)73 London(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)59 Madrid(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)70 Malta(COLUMN)clear(COLUMN)1 p.m.(COLUMN)77 Manila(COLUMN)rain(COLUMN)8 p.m.(COLUMN)79 Moscow(COLUMN)cloudy(COLUMN)3 p.m.(COLUMN)41 New Delhi(COLUMN)clear(COLUMN)5 p.m.(COLUMN)90 Nice(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)66 Oslo(COLUMN)clear(COLUMN)1 p.m.(COLUMN)59 Paris(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)57 Peking(COLUMN)clear(COLUMN)8 p.m.(COLUMN)68 Rome(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)70 Saigon(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)81 Sofia(COLUMN)rain(COLUMN)2 p.m.(COLUMN)48 Stockholm(COLUMN)clear(COLUMN)1 p.m.(COLUMN)52 Sydney(COLUMN)pt. cldy.(COLUMN)10 p.m.(COLUMN)57 Tel Aviv(COLUMN)pt. cldy.(COLUMN)2 p.m.(COLUMN)86 Tokyo(COLUMN)pt. cldy.(COLUMN)9 p.m.(COLUMN)73 Tunis(COLUMN)clear(COLUMN)1 p.m.(COLUMN)75 Vienna(COLUMN)haze(COLUMN)1 p.m.(COLUMN)55 Warsaw(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)50(END TABLE) Temperatures (Western Hemisphere)(TABLE) $ Acapulco(COLUMN)fair(COLUMN)82(COLUMN)77 Barbados(COLUMN)pt. cldy.(COLUMN)88(COLUMN)81 Bogota(COLUMN)pt. cldy.(COLUMN)66(COLUMN)38 Calgary(COLUMN)cloudy(COLUMN)61(COLUMN)39 Cutlacan(COLUMN)cloudy(COLUMN)97(COLUMN)78 Edmonton(COLUMN)cloudy(COLUMN)64(COLUMN)39 Havana(COLUMN)pt. cldy.(COLUMN)88(COLUMN)77 Kingston(COLUMN)fair(COLUMN)90(COLUMN)78 Montago Bay(COLUMN)clear(COLUMN)88(COLUMN)73 Mexico City(COLUMN)pt. cldy.(COLUMN)77(COLUMN)59 Monterrey(COLUMN)pt. cldy.(COLUMN)90(COLUMN)74 Montreal(COLUMN)cloudy(COLUMN)61(COLUMN)48 Nassau(COLUMN)fair(COLUMN)86(COLUMN)74 Ottawa(COLUMN)pt. cldy.(COLUMN)59(COLUMN)45 Regina(COLUMN)cloudy(COLUMN)57(COLUMN)48 St. Kitts(COLUMN)pt. cldy.(COLUMN)89(COLUMN)77 Toronto(COLUMN)cloudy(COLUMN)57(COLUMN)52 Vancouver(COLUMN)drizzle(COLUMN)54(COLUMN)50 Veracruz(COLUMN)pt. cldy.(COLUMN)90(COLUMN)76 Winnipeg(COLUMN)rain(COLUMN)57(COLUMN)54(END TABLE)(KEYWORD)