Washington: Today - Rain, High in the upper 50s, low in the upper 40s. The chance of rain is 90 per cent today and 40 per cent tonight. Saturday - Partly cloudy, high in the mid 60s.

Marryland and Vlrginia: Today - Rain, highs in the 50s lows in the 40s. Saturday - Partly cloudy, highs in the 60s.

Lower Potomac and Chesapeake Bay: Today - Rain, visibllity of from 3 to 5 miles, but lower in rain. Wind will be from the north at from 15 to 25 knots. Waves in unprotected waters be from 2 to 3 feet.

Extended Aree Forecast for Sunday through Thursday: Chance of rain of Sunday, fair through the rest of the period. Highs will be from the mid 50s to mid 60s, lows from the 30s to the low 50s. Normal Washington temperatures for the period are a high of 69 and a low of 49.

West Virginla: Today - Rain, highs from the upper 40s to the upper 50s, low from the low 30s to the 40s. Saturday - Partly cloudy, highs from the upper 40s to the upper 50s.

The National Weather Forecast for today - A rainy day is in store for eastern sections of the middle Atantic Coast and much of New England. The remainder of the nation will have mostly sunny skies, except for scattered showers in the poper Great Lakes. Temperatures will remain cool in the East and North, but it will be mlld in the Southwest. Warm readings will round in desert areas and interior California.

Almanac Data for Today - Sun rises 7:15 a.m., sets 6:33 p.m.; moon rises 9:11 a.m., sets 8:00 p.m. Tides: High 8:54 a.m. and 9:18 p.m.; low, 3:26 a.m. and 3:36 p.m. High and low tldes at the following locations can be obtained by subfracting 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), Nortols (11 1/2), Virginia Beach (1), Solomon's 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. to 3 p.m. period was 10 for the pollutant, photochemical exidants. Index values between zero and 24 Indicate good air quality. When the index exceeds 100 the air is considered very unhealthy and individuals with king, heart and are allments are urged to restirct their activity. The forecast for today indicates that the air quality will be good.

The National Weather Service forecasts the Potomac River stage of Little Falls should be near 2.9 feet today.

Washington date at 9p.m. (EDT) yesterday: Highest temperature since [WORD ILLEGIBLE] a.m. yesterday, 55 degrees at 1:40 p.m. Lowest temperature since midnight, 51 degrees at 3:55 a.m. Deficiency of temperature since October 1, 29 degrees. Excess of temperature since Jan. 1, 412 degrees. Record high temperature for today, 87 degress in 1975. Record low temperature for today, 32 degrees in 1875. Relative humidty: Maximum, 51 per cent at 5 p.m.; minimum, 40 per cent at midnight. Excess of precipitation since October 1, .02 Inches. Deflciency of precipitation since Jan. 1, 9.15 Inches. Highest observed wind since [WORD ILLEGIBLE] a.m., 17 miles per hour from the north at 5&54 p.m. Peak [WORD ILLEGIBLE] since [WORD ILLEGIBLE] a.m., 23 miles per hour from the northeast at 11:03 a.m. Local Temp., Humidity(TABLE) Time(COLUMN)T.(COLUMN)M. 12 midnight(COLUMN)53(COLUMN)43 1 a.m.(COLUMN)52(COLUMN)45 2 a.m.(COLUMN)52(COLUMN)45 3 a.m.(COLUMN)52(COLUMN)46 4 a.m.(COLUMN)52(COLUMN)46 5 a.m.(COLUMN)51(COLUMN)43 6 a.m.(COLUMN)51(COLUMN)50 7 a.m.(COLUMN)51(COLUMN)50 8 a.m.(COLUMN)51(COLUMN)50 9 a.m.(COLUMN)52(COLUMN)48 10 a.m.(COLUMN)52(COLUMN)50 11 a.m.(COLUMN)53(COLUMN)50 12 noon(COLUMN)53(COLUMN)50 1 p.m.(COLUMN)54(COLUMN)49 2 p.m.(COLUMN)55(COLUMN)47 3 p.m.(COLUMN)55(COLUMN)49 4 p.m.(COLUMN)55(COLUMN)47 5 p.m.(COLUMN)55(COLUMN)51 6 p.m.(COLUMN)55(COLUMN)49 7 p.m.(COLUMN)55(COLUMN)49(END TABLE) Temperatures ending 8 a.m. (EDT) Yesterday(TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)60(COLUMN)37 Albuqverque(COLUMN)67(COLUMN)39 Amarillo(COLUMN)70(COLUMN)42 Anchorage(COLUMN)56(COLUMN)47 Ashevliie(COLUMN)57(COLUMN)36 Atlanta(COLUMN)62(COLUMN)44 Atlantic City(COLUMN)60(COLUMN)47 Austin(COLUMN)72(COLUMN)48 Baltimore(COLUMN)63(COLUMN)49 Billings(COLUMN)68(COLUMN)50 Birmingham(COLUMN)58(COLUMN)37 Bismarck(COLUMN)66(COLUMN)41 Boise(COLUMN)72(COLUMN)44 Boston(COLUMN)67(COLUMN)51 Brownsville(COLUMN)76(COLUMN)50 Buffalo(COLUMN)50(COLUMN)39 Burlington(COLUMN)55(COLUMN)42 Casper(COLUMN)67(COLUMN)44 Charleston, S.C.(COLUMN)65(COLUMN)50 Charl't'n, W. Va.(COLUMN)50(COLUMN)40 Charlotte(COLUMN)61(COLUMN)43 Cheyenne(COLUMN)68(COLUMN)38 Chicago(COLUMN)53(COLUMN)34 Cinclnnatl(COLUMN)47(COLUMN)39 Cleveland(COLUMN)51(COLUMN)45 Columbia, S.C.(COLUMN)64(COLUMN)45 Columbus(COLUMN)51(COLUMN)42 Dal. -Ft. Worth(COLUMN)73(COLUMN)38 Dayton(COLUMN)52(COLUMN)34 Denver(COLUMN)70(COLUMN)36 Des Moines(COLUMN)55(COLUMN)35 Detrait(COLUMN)50(COLUMN)26 Duluth(COLUMN)50(COLUMN)34 El Paso(COLUMN)67(COLUMN)44 Falrbanks(COLUMN)34(COLUMN)27 Fargo(COLUMN)59(COLUMN)40 Flagstaff(COLUMN)67(COLUMN)30 Great Falls(COLUMN)68(COLUMN)53 Hartford(COLUMN)65(COLUMN)45 Helena(COLUMN)69(COLUMN)38 Honolutu(COLUMN)87(COLUMN)74 Houston(COLUMN)68(COLUMN)53 Indlanapolis(COLUMN)52(COLUMN)31 Jackson, Miss.(COLUMN)62(COLUMN)34 Jacksonville(COLUMN)73(COLUMN)52 Juneeu(COLUMN)48(COLUMN)44 Kansas City(COLUMN)57(COLUMN)38 Las Vegas(COLUMN)87(COLUMN)53 Little Rock(COLUMN)61(COLUMN)39 Los Angeles(COLUMN)83(COLUMN)61 Memghis(COLUMN)61(COLUMN)38 Mlami Beach(COLUMN)85(COLUMN)74 Midland-Odessa(COLUMN)71(COLUMN)42 Milwaukee(COLUMN)50(COLUMN)30 Mpts. St. paul(COLUMN)52(COLUMN)32 Nashville(COLUMN)57(COLUMN)42 New Orieans(COLUMN)66(COLUMN)53 New York(COLUMN)59(COLUMN)49 Norfolk(COLUMN)64(COLUMN)49 North Platte(COLUMN)70(COLUMN)27 Oklahoma City(COLUMN)68(COLUMN)40 Omana(COLUMN)59(COLUMN)41 Oriando(COLUMN)90(COLUMN)60 Philadelphia(COLUMN)61(COLUMN)47 Phonenix(COLUMN)93(COLUMN)71 Pittsourgh(COLUMN)51(COLUMN)40 Portiand, Me.(COLUMN)61(COLUMN)40 Portiand, Ore.(COLUMN)67(COLUMN)55 Providence(COLUMN)64(COLUMN)46 Raleigh(COLUMN)59(COLUMN)43 Rapid City(COLUMN)66(COLUMN)38 Reno(COLUMN)79(COLUMN)35 Richmond(COLUMN)60(COLUMN)44 St. Louis(COLUMN)56(COLUMN)33 St. Prtg.-Tampa(COLUMN)86(COLUMN)58 Salt Lake City(COLUMN)69(COLUMN)40 San Antonio(COLUMN)75(COLUMN)38 San Diego(COLUMN)78(COLUMN)65 San Francisco(COLUMN)77(COLUMN)55 San Juan(COLUMN)88(COLUMN)75 St. Ste. Marie(COLUMN)45(COLUMN)35 Seattle(COLUMN)64(COLUMN)52 Shreveoort(COLUMN)68(COLUMN)35 Sioux Fails(COLUMN)58(COLUMN)35 Spokane(COLUMN)67(COLUMN)47 Syracuse(COLUMN)57(COLUMN)39 Topeka(COLUMN)61(COLUMN)36 Tucson(COLUMN)85(COLUMN)67 Tutsa(COLUMN)65(COLUMN)37 Washington(COLUMN)65(COLUMN)51 Wichita(COLUMN)66(COLUMN)40(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN)Cloudy(COLUMN) 1 p.m.(COLUMN)59 Amsterdam(COLUMN)pt. cldy(COLUMN) 1 p.m.(COLUMN)59 Ankara(COLUMN)pt. cldy(COLUMN) 3 p.m.(COLUMN)75 Athens(COLUMN)pt. cldy(COLUMN) 2 p.m.(COLUMN)72 Berlin(COLUMN)pt. cldy(COLUMN) 1 p.m. Birmingham(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN)55 Brussels(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)61 Casablanca(COLUMN)cloudy(COLUMN)noon(COLUMN)75 Copenhagen(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)59 Dublin(COLUMN)pt. cldy(COLUMN) 1 p.m.(COLUMN)59 Gerneva(COLUMN)pt. cldy(COLUMN) 1 p.m.(COLUMN)52 Hong Kong(COLUMN)clear(COLUMN) 8 p.m.(COLUMN)77 Lisbon(COLUMN)clear(COLUMN)noon(COLUMN)75 London(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)59 Madrid(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)64 Malta(COLUMN)rain(COLUMN) 1 p.m.(COLUMN)63 Manila(COLUMN)pt. cldy(COLUMN) 8 p.m.(COLUMN)84 Mascow(COLUMN)cloudy(COLUMN) 3 p.m.(COLUMN)46 Nice(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)72 Osio(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)57 Paris(COLUMN)clear 1 p.m.(COLUMN)64 Peking(COLUMN)pt. cldy(COLUMN) 8 p.m.(COLUMN)59 Rome(COLUMN)pt. cldy(COLUMN) 1 p.m.(COLUMN)72 Saigon(COLUMN)pt. cldy(COLUMN)79 Sofia(COLUMN)pt. cldy(COLUMN) 2 p.m.(COLUMN)59 Stockholm(COLUMN)pt. cldy(COLUMN) 1 p.m.(COLUMN)52 Syndey(COLUMN)clear(COLUMN)10 p.m.(COLUMN)73 Tel Aviv(COLUMN)clear(COLUMN) 2 p.m.(COLUMN)82 Tokyo(COLUMN)pt. cldy(COLUMN) 9 p.m.(COLUMN)64 Vienna(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN)59 Warsaw(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN)61(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapvlco(COLUMN)sunny(COLUMN)90(COLUMN)79 Barbados(COLUMN)pt. sunny(COLUMN)88(COLUMN)84 Bermuda(COLUMN)pt. cldy(COLUMN)85(COLUMN)77 Bogota(COLUMN)cloudy(COLUMN)68(COLUMN)52 Calgary(COLUMN)cloudy(COLUMN)66(COLUMN)36 Culiacan(COLUMN)sunny(COLUMN)95(COLUMN)70 Edmonton(COLUMN)clear(COLUMN)68(COLUMN)37 Havana(COLUMN)pt. cldy(COLUMN)88(COLUMN)75 Kingston(COLUMN)pt. sunny(COLUMN)90(COLUMN)81 Montego Bay(COLUMN)cloudy(COLUMN)90(COLUMN)73 Mazico City(COLUMN)haze(COLUMN)64(COLUMN)52 Monterrey(COLUMN)sunny(COLUMN)68(COLUMN)44 Montreal(COLUMN)clear(COLUMN)57(COLUMN)34 Nassau(COLUMN)sunny(COLUMN)90(COLUMN)72 Ottawa(COLUMN)clear(COLUMN)52(COLUMN)32 Regina(COLUMN)clear(COLUMN)72(COLUMN)46 St. Kitts(COLUMN)pt. cldy(COLUMN)90(COLUMN)75 St. Thomas(COLUMN)pt. cldy(COLUMN)88(COLUMN)77 Toronto(COLUMN)pt. cldy(COLUMN)50(COLUMN)32 Vancouver(COLUMN)clear(COLUMN)55(COLUMN)48 Veracruz(COLUMN)cloudy(COLUMN)80(COLUMN)68 Winnipes(COLUMN)pt. cldy(COLUMN)57(COLUMN)43(END TABLE)