Washington: Today - Cloudy, rain possible, high in upper 60s, low in upper 40s. The chance of rain is 10 percent today and 40 percent tonight. Wind will be from the east at from 5 to 15 mph. Tuesday - Rain possible, high near 60.

Maryland and Virginia: Today - Cloudy, rain possible, highs from the 60s to near 70, lows in the 40s. Tuesday - Rain possible, highs from the 50s to the mid 60s.

Lower Potomac and Chesapeake Bay: Today - Variably cloudy with rain possible. Wind will be from the east at from 8 to 15 knots. Visibility will be more than 5 miles, except lower in rain. Waves in unprotected waters will be near 1 foot.

Extended Area Forecast for Wednesday through Friday: Chance of showers on Wednesday and Thursday, variably cloudy on Friday. Highs will be from the 50s to the 60s, lows in the 40s. Normal Washington temperatures for the period are a high of 71 and a low of 50.

West Virginia: Today - Cloudy, rain possible, highs in the 60s, lows from the mid 30s to the mid 40s. Tuesday - Cloudy, rain possible, highs in the 50s.

The Council of Governments' Air Quality Index for yesterday showed the high reading in the Washington area during the 9 a.m. to 10 a.m. period was 31 for the polutant, photochemical oxidants. Index values between 25 and 49 indicate 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 forecast for today indicates that the aid quality will be fair.

The National Weather Service forecasts the Potomac River stage at Little Falls should be near 4.1 feet today.

Almanac Data for today: The sun rises 5:20 a.m., sets 6:54 p.m.; moon rises 8:46 p.m., sets 6:30 a.m. Tides: high 3:300 a.m. and 3:41 p.m., low 3:41 a.m. and 9:08 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).

Washington data at 7 p.m. (EST) yesterday: Highest temperature since 7 a.m. yesterday, 66 degrees at 3:01 p.m. Lowest temperature since midnight, 41 degrees at 5:30 a.m. Excess of temperature since April 1, 63 degrees. Deficiency of temperature since Jan. 1, 200 degrees. Record high temperature for today, 94 degrees in 1960. Record low temperature for today, 34 degrees in 1930. Relative humidity: Maximum, 57 percent at 7 a.m. Minimum, 26 percent at 2 p.m. Deficiency of precipitation since April 1, 10.06 inches. Excess of precipitation since Jan. 1, 2.54 inches. Highest observed wind since 7 a.m. 9 miles per hour from the south at 3:53 p.m. Local Temp., Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 midnite(COLUMN)52(COLUMN)41 1 a.m.(COLUMN)51(COLUMN)39 2 a.m.(COLUMN)47(COLUMN)46 3 a.m.(COLUMN)44(COLUMN)51 4 a.m.(COLUMN)44(COLUMN)51 5 a.m.(COLUMN)44(COLUMN)51 6 a.m.(COLUMN)42(COLUMN)57 7 a.m.(COLUMN)48(COLUMN)46 8 a.m.(COLUMN)51(COLUMN)41 9 a.m.(COLUMN)54(COLUMN)35 10 a.m.(COLUMN)57(COLUMN)30 11 a.m.(COLUMN)58(COLUMN)29 12 noon(COLUMN)60(COLUMN)28 1 p.m.(COLUMN)42(COLUMN)27 2 p.m.(COLUMN)64(COLUMN)26 3 p.m.(COLUMN)65(COLUMN)26 4 p.m.(COLUMN)64(COLUMN)29 5 p.m.(COLUMN)65(COLUMN)30 6 p.m.(COLUMN)65(COLUMN)30 7 p.m.(COLUMN)62(COLUMN)36(END TABLE) Temperatures ending 7 a.m. (EST) yesterday:(TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)58(COLUMN)30 Albuquerque(COLUMN)68(COLUMN)33 Amarillo(COLUMN)71(COLUMN)40 Anchorage(COLUMN)51(COLUMN)39 Asheville(COLUMN)69(COLUMN)34 Atlanta(COLUMN)68(COLUMN)44 Atlantic City(COLUMN)60(COLUMN)38 Austin(COLUMN)72(COLUMN)56 Baltimore(COLUMN)62(COLUMN)34 Billings(COLUMN)56(COLUMN)31 Birmingham(COLUMN)70(COLUMN)48 Bismarck(COLUMN)46(COLUMN)40 Boise(COLUMN)51(COLUMN)33 Boston(COLUMN)56(COLUMN)44 Brownsville(COLUMN)83(COLUMN)71 Buffalo(COLUMN)47(COLUMN)30 Burlington(COLUMN)48(COLUMN)24 Casper(COLUMN)50(COLUMN)27 Charleston, S.C.(COLUMN)68(COLUMN)54 Charl'stn, W.V.(COLUMN)60(COLUMN)37 Charlotte(COLUMN)66(COLUMN)40 Cheyenne(COLUMN)46(COLUMN)30 Chicago(COLUMN)56(COLUMN)44 Cincinnati(COLUMN)59(COLUMN)44 Cleveland(COLUMN)52(COLUMN)31 Columbus, S.C.(COLUMN)67(COLUMN)36 Columbus, Ohio(COLUMN)56(COLUMN)40 Dal.-Ft. Worth(COLUMN)81(COLUMN)51 Denver(COLUMN)55(COLUMN)36 Des Moines(COLUMN)57(COLUMN)43 Detroit(COLUMN)57(COLUMN)34 Duluth(COLUMN)56(COLUMN)36 El Paso(COLUMN)79(COLUMN)53 Fairbanks(COLUMN)44(COLUMN)35 Fargo(COLUMN)59(COLUMN)40 Flagstaff(COLUMN)62(COLUMN)24 Great Falls(COLUMN)54(COLUMN)26 Hartford(COLUMN)64(COLUMN)39 Helena(COLUMN)54(COLUMN)37 Honolulu(COLUMN)85(COLUMN)69 Houston(COLUMN)74(COLUMN)64 Indianapolis(COLUMN)59(COLUMN)49 Jackson, Miss.(COLUMN)79(COLUMN)58 Jacksonville(COLUMN)72(COLUMN)48 Juneau(COLUMN)57(COLUMN)33 Kansas City(COLUMN)52(COLUMN)39 Las Vegas(COLUMN)76(COLUMN)49 Little Rock(COLUMN)75(COLUMN)55 Los Angeles(COLUMN)72(COLUMN)53 Louisville(COLUMN)60(COLUMN)47 Memphis(COLUMN)74(COLUMN)58 Miami Beach(COLUMN)78(COLUMN)74 Midland-Odessa(COLUMN)82(COLUMN)46 Milwaukee(COLUMN)48(COLUMN)39 Mpls.-St. Paul(COLUMN)59(COLUMN)43 Nashville(COLUMN)64(COLUMN)47 New Orleans(COLUMN)85(COLUMN)69 New York(COLUMN)64(COLUMN)41 Norfolk(COLUMN)59(COLUMN)39 North Platte(COLUMN)51(COLUMN)26 Oklahoma City(COLUMN)77(COLUMN)43 Omaha(COLUMN)48(COLUMN)41 Orlando(COLUMN)85(COLUMN)62 Philadelphia(COLUMN)60(COLUMN)33 Phoenix(COLUMN)83(COLUMN)54 Pittsburgh(COLUMN)56(COLUMN)31 Portland, Maine(COLUMN)56(COLUMN)29 Portland, Ore.(COLUMN)56(COLUMN)41 Providence(COLUMN)62(COLUMN)38 Raleigh(COLUMN)67(COLUMN)35 Rapid City(COLUMN)49(COLUMN)31 Reno(COLUMN)61(COLUMN)29 Richmond(COLUMN)67(COLUMN)33 St. Louis(COLUMN)54(COLUMN)46 St. Prbg.-T'mpa(COLUMN)84(COLUMN)63 Salt Lake City(COLUMN)55(COLUMN)35 San Antonio(COLUMN)79(COLUMN)58 San Diego(COLUMN)70(COLUMN)58 San Francisco(COLUMN)61(COLUMN)52 San Juan(COLUMN)87(COLUMN)73 St. Ste. Marie(COLUMN)53(COLUMN)27 Seattle(COLUMN)50(COLUMN)41 Shreveport(COLUMN)82(COLUMN)61 Sioux Falls(COLUMN)50(COLUMN)40 Spokane(COLUMN)52(COLUMN)33 Syracuse(COLUMN)49(COLUMN)29 Topeka(COLUMN)60(COLUMN)34 Tucson(COLUMN)78(COLUMN)49 Tulsa(COLUMN)74(COLUMN)41 Washington(COLUMN)63(COLUMN)41 Wichita(COLUMN)72(COLUMN)36(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN)haze(COLUMN)1 p.m.(COLUMN)59 Amsterdam(COLUMN)clear(COLUMN)1 p.m.(COLUMN)57 Ankara(COLUMN)cloudy(COLUMN)3 p.m.(COLUMN)52 Athens(COLUMN)cloudy(COLUMN)2 p.m.(COLUMN)61 Auckland(COLUMN)clear(COLUMN)midnight(COLUMN)59 Berlin(COLUMN)clear(COLUMN)1 p.m.(COLUMN)61 Birmingham(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)54 Brussels(COLUMN)clear(COLUMN)1 p.m.(COLUMN)61 Cairo(COLUMN)dust(COLUMN)2 p.m.(COLUMN)83 Casablanca(COLUMN)cloudy(COLUMN)noon(COLUMN)68 Copenhagen(COLUMN)clear(COLUMN)1 p.m.(COLUMN)55 Dublin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)50 Geneva(COLUMN)clear(COLUMN)1 p.m.(COLUMN)57 Hong Kong(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)73 Lisbon(COLUMN)cloudy(COLUMN)noon(COLUMN)59 London(COLUMN)clear(COLUMN)1 p.m.(COLUMN)57 Madrid(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)66 Malta(COLUMN)clear(COLUMN)1 p.m.(COLUMN)64 Manila(COLUMN)pt. cldy(COLUMN)8 p.m.(COLUMN)84 Moscow(COLUMN)cloudy(COLUMN)3 p.m.(COLUMN)46 New Delhi(COLUMN)rain(COLUMN)5 p.m.(COLUMN)86 Nice(COLUMN)clear(COLUMN)1 p.m.(COLUMN)61 Oslo(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)48 Paris(COLUMN)clear(COLUMN)1 p.m.(COLUMN)61 Peking(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)64 Rome(COLUMN)clear(COLUMN)1 p.m.(COLUMN)66 Saigon(COLUMN)cloudy(COLUMN)3 p.m.(COLUMN)81 Sofia(COLUMN)pt. cldy(COLUMN)2 p.m.(COLUMN)55 Stockholm(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)59 Sydney(COLUMN)pt. cldy(COLUMN)10 p.m.(COLUMN)64 Tokyo(COLUMN)cloudy(COLUMN)9 p.m.(COLUMN)61 Tunis(COLUMN)clear(COLUMN)1 p.m.(COLUMN)63 Vienna(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)61 Warsaw(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)64(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)clear(COLUMN)87(COLUMN)73 Barbados(COLUMN)pt. cldy(COLUMN)88(COLUMN)78 Bermuda(COLUMN)fair(COLUMN)84(COLUMN)63 Bogota(COLUMN)cloudy(COLUMN)66(COLUMN)40 Calgary(COLUMN)snow(COLUMN)46(COLUMN)32 Cullacan(COLUMN)fair(COLUMN)95(COLUMN)55 Edmonton(COLUMN)cloudy(COLUMN)52(COLUMN)36 Havana(COLUMN)pt. cldy(COLUMN)85(COLUMN)70 Kingston(COLUMN)fair(COLUMN)87(COLUMN)77 Montego Bay(COLUMN)pt. cldy(COLUMN)86(COLUMN)73 Mexico City(COLUMN)haze(COLUMN)85(COLUMN)57 Monterrey(COLUMN)clear(COLUMN)95(COLUMN)71 Montreal(COLUMN)clear(COLUMN)52(COLUMN)27 Nassau(COLUMN)fair(COLUMN)85(COLUMN)70 Ottawa(COLUMN)clear(COLUMN)50(COLUMN)30 Regina(COLUMN)rain(COLUMN)55(COLUMN)41 St. Kitta(COLUMN)fair(COLUMN)87(COLUMN)76 Toronto(COLUMN)clear(COLUMN)48(COLUMN)25 Vancouver(COLUMN)cloudy(COLUMN)59(COLUMN)37 Veracruz(COLUMN)cloudy(COLUMN)90(COLUMN)73 Winnipeg(COLUMN)cloudy(COLUMN)59(COLUMN)37(END TABLE)