Weather: Today - Rain, high in 70s, low in mid to upper 40s. Chance of rain 50 per cent through tonight. Sunday - Clearing, high in mid to upper 60s.

Maryland: Today - Partly cloudy with chance of rain, highs in 70s, lows in 40s. Sunday - Clearing, highs in 60s.

Virginia: Today - Chance of rain, highs in 70s to low 80s. Sunday - Partly cloudy, highs in 60s.

Lower Potomac and Chesapeake Bay: Today - Partly cloudy with chance of rain with northeasterly winds at 18 knots or less through tonight. Visibility should be greater than 5 miles, decreasing to 2 miles or less in precipitation.

Extended Area Outlook: For Monday through Wednesday - Fair skies with highs in 60s to mid 70s and lows in mid 40s to mid 50s through the period.

West Virginia: Today - Rain today with clearing tonight, highs in 70s, lows in mid 40s to mid 50s. Sunday - Partly cloudy, highs in mid 60s to mid 70s.

The National Weather Forecast for Today - Showers, with snow in the higher elevations, will be scattered from the northern two thirds of the Pacific Coast through the north half of the Rockies. Showers and occasional thundershowers will continue across the north half of the plains, over the mid Mississippi Valley, the Ohio Valley through Georgia and Florida, across western New York through the Virginias. Temperatures will be warm from Florida through the Carolinas. It will be cool from New England across the northern tier of states through the upper Mississippi Valley, the north half of the Plains and from the Rockies through the Pacific Coast. Elsewhere, temperatures will be mild.

Almanac data for May 7, 1977. Sun rises 6:04 a.m., sets 8:06 p.m.; moon rises 12:32 a.m., sets 10:03 a.m. Tides: High 11:58 a.m. and 6:59 p.m. High and low tides at the following locations can be obtained by subtracting the hours indicated from the tides above.Annapolis (3 1/2); Bloody Point Lighthouse (4 1/2); Deale, Md. (4 1/2); Colonial Beach (6); Norfolk (1 1/2); Virginia Beach (1); Solomons Island (6 1/2); Point Lookout (7). Pollen count: 43 trees (note: more than 7 or higher is considered undesirable.)

The Council of Governments' Air Quality Index for yesterday showed the high reading in the Washington areas during the 2 to 3 p.m. period was 43 for the pollutant, photochemical oxidants. Index values between 25 and 49 indicate fair air quality. When the index exceeds 100 the air becomes hazardous and persons with lung, heart and eye problems should restrict their activity. The forecast for today indicates the air quality will improve.

The National Weather Service forecasts that the Potomac River stage at Little Falls will remain near 3.6 feet through today. Local Temp., Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 mid.(COLUMN)69(COLUMN)97 1 a.m.(COLUMN)69(COLUMN)90 2 a.m.(COLUMN)67(COLUMN)93 3 a.m.(COLUMN)65(COLUMN)93 4 a.m.(COLUMN)64(COLUMN)93 5 a.m.(COLUMN)63(COLUMN)93 6 a.m.(COLUMN)63(COLUMN)93 7 a.m.(COLUMN)64(COLUMN)90 8 a.m.(COLUMN)65(COLUMN)84 9 a.m.(COLUMN)71(COLUMN)76 10 a.m.(COLUMN)74(COLUMN)71 11 a.m.(COLUMN)77(COLUMN)69 12 noon(COLUMN)81(COLUMN)63 1 p.m.(COLUMN)85(COLUMN)57 2 p.m.(COLUMN)85(COLUMN)59 3 p.m.(COLUMN)87(COLUMN)54 4 p.m.(COLUMN)87(COLUMN)54 5 p.m.(COLUMN)84(COLUMN)59 6 p.m.(COLUMN)71(COLUMN)93(END TABLE) Temperatures ending 8 a.m. (EDT) Yesterday(TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)62(COLUMN)55 Albuquerque(COLUMN)77(COLUMN)49 Amarillo(COLUMN)75(COLUMN)53 Anchorage(COLUMN)51(COLUMN)39 Asheville(COLUMN)82(COLUMN)53 Atlanta(COLUMN)83(COLUMN)60 Atlantic City(COLUMN)66(COLUMN)56 Austin(COLUMN)79(COLUMN)65 Baltimore(COLUMN)84(COLUMN)59 Billings(COLUMN)61(COLUMN)41 Birmingham(COLUMN)85(COLUMN)62 Bismarck(COLUMN)68(COLUMN)32 Boise(COLUMN)51(COLUMN)40 Boston(COLUMN)57(COLUMN)50 Brownsville(COLUMN)85(COLUMN)73 Buffalo(COLUMN)67(COLUMN)53 Burlington, Vt.(COLUMN)77(COLUMN)58 Casper(COLUMN)58(COLUMN)39 Charleston, S.C.(COLUMN)86(COLUMN)70 Ch'rlestn, W.Va.(COLUMN)72(COLUMN)62 Charlotte, N.C.(COLUMN)84(COLUMN)59 Cheyenne(COLUMN)62(COLUMN)38 Chicago(COLUMN)82(COLUMN)59 Cincinnati(COLUMN)81(COLUMN)66 Cleveland(COLUMN)79(COLUMN)62 Columbia, S.C.(COLUMN)94(COLUMN)61 Columbus, Ohio(COLUMN)81(COLUMN)64 Dal.-Ft. Worth(COLUMN)82(COLUMN)63 Dayton(COLUMN)80(COLUMN)65 Denver(COLUMN)73(COLUMN)42 Des Moines(COLUMN)78(COLUMN)62 Detroit(COLUMN)83(COLUMN)61 Duluth(COLUMN)68(COLUMN)48 El Paso(COLUMN)75(COLUMN)60 Fairbanks(COLUMN)60(COLUMN)37 Fargo(COLUMN)68(COLUMN)43 Flagstaff(COLUMN)61(COLUMN)38 Great Falls(COLUMN)56(COLUMN)29 Hartford(COLUMN)60(COLUMN)57 Helena(COLUMN)53(COLUMN)33 Honolulu(COLUMN)85(COLUMN)71 Houston(COLUMN)81(COLUMN)72 Indianapolis(COLUMN)83(COLUMN)65 Jackson, Miss.(COLUMN)86(COLUMN)69 Jacksonville(COLUMN)86(COLUMN)63 Juneau(COLUMN)59(COLUMN)35 Kansas City(COLUMN)79(COLUMN)63 Las Vegas(COLUMN)82(COLUMN)55 Little Rock(COLUMN)85(COLUMN)68 Los Angeles(COLUMN)66(COLUMN)52 Louisville(COLUMN)85(COLUMN)67 Memphis(COLUMN)86(COLUMN)72 Miami Beach(COLUMN)79(COLUMN)75 Midland(COLUMN)86(COLUMN)56 Milwaukee(COLUMN)80(COLUMN)49 Mpl.-St. Paul(COLUMN)72(COLUMN)41 Nashville(COLUMN)86(COLUMN)65 New Orleans(COLUMN)85(COLUMN)70 New York(COLUMN)63(COLUMN)56 Norfolk(COLUMN)85(COLUMN)62 North Platte(COLUMN)71(COLUMN)48 Oklahoma City(COLUMN)80(COLUMN)59 Omaha(COLUMN)78(COLUMN)62 Orlando(COLUMN)84(COLUMN)67 Philadelphia(COLUMN)80(COLUMN)65 Phoenix(COLUMN)88(COLUMN)62 Pittsburgh(COLUMN)78(COLUMN)62 Portland, Me.(COLUMN)63(COLUMN)46 Portland, or.(COLUMN)56(COLUMN)44 Providence(COLUMN)56(COLUMN)55 Raleigh(COLUMN)87(COLUMN)55 Rapid City(COLUMN)71(COLUMN)48 Reno(COLUMN)54(COLUMN)24 Richmond(COLUMN)87(COLUMN)54 St. Louis(COLUMN)87(COLUMN)68 St. Prbg.-Tampa(COLUMN)88(COLUMN)72 Salt Lake City(COLUMN)63(COLUMN)43 San Antonio(COLUMN)79(COLUMN)67 San Dieto(COLUMN)65(COLUMN)56 San Francisco(COLUMN)54(COLUMN)47 St. Ste. Marie(COLUMN)51(COLUMN)43 Seattle(COLUMN)57(COLUMN)43 Shreveport(COLUMN)84(COLUMN)65 Sioux Falls(COLUMN)74(COLUMN)46 Spokane(COLUMN)53(COLUMN)34 Syracuse(COLUMN)65(COLUMN)53 Topeka(COLUMN)85(COLUMN)66 Tuscon(COLUMN)81(COLUMN)57 Tulsa(COLUMN)81(COLUMN)63 Washington(COLUMN)83(COLUMN)61 Wichita(COLUMN)82(COLUMN)61(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN)rain(COLUMN)1 p.m.(COLUMN)43 Amsterdam(COLUMN)clear(COLUMN)1 p.m.(COLUMN)57 Ankara(COLUMN)cloudy(COLUMN)3 p.m.(COLUMN)55 Athens(COLUMN)pt. cldy.(COLUMN)2 p.m.(COLUMN)72 Auckland(COLUMN)clear(COLUMN)midnight(COLUMN)50 Berlin(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)67 Birmingham(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)52 Brussels(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)55 Cairo(COLUMN)clear(COLUMN)2 p.m.(COLUMN)81 Casablanca(COLUMN)clear(COLUMN)noon(COLUMN)66 Copenhagen(COLUMN)pt. cldy(COLUMN)1 P.m.(COLUMN)55 Dublin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)52 Geneva(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)55 Hong Kong(COLUMN)clear(COLUMN)8 p.m.(COLUMN)81 Lisbon(COLUMN)cloudy(COLUMN)noon(COLUMN)63 London(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)55 Madrid(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)61 Malta(COLUMN)clear(COLUMN)1 p.m.(COLUMN)72 Manila(COLUMN)clear(COLUMN)8 p.m.(COLUMN)84 Moscow(COLUMN)pt. cldy(COLUMN)3 p.m.(COLUMN)72 New Delhi(COLUMN)clear(COLUMN)5 p.m.(COLUMN)93 Nice(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)61 Oslo(COLUMN)cloudy(COLUMN)1 P.m.(COLUMN)55 Paris(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)57 Peking(COLUMN)clear(COLUMN)8 p.m.(COLUMN)66 Rome(COLUMN)clear(COLUMN)1 p.m.(COLUMN)66 Saigon(COLUMN)pt. cldy(COLUMN)8 p.m.(COLUMN)84 Sofia(COLUMN)pt. cldy(COLUMN)2 p.m.(COLUMN)68 Stockholm(COLUMN)clear(COLUMN)1 p.m.(COLUMN)73 Sydney(COLUMN)clear(COLUMN)10 p.m.(COLUMN)59 Tel Aviv(COLUMN)clear(COLUMN)2 p.m.(COLUMN)73 Tokyo(COLUMN)clear(COLUMN)9 p.m.(COLUMN)66 Tunis(COLUMN)clear(COLUMN)1 p.m.(COLUMN)66 Vienna(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)59 Warsaw(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)68(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)haze(COLUMN)86(COLUMN)85 Barbacos(COLUMN)cloudy(COLUMN)85(COLUMN)77 Bermuda(COLUMN)clear(COLUMN)78(COLUMN)67 Bogota(COLUMN)cloudy(COLUMN)58(COLUMN)46 Calgary(COLUMN)fog(COLUMN)43(COLUMN)36 Culiacan(COLUMN)pt. cldy(COLUMN)94(COLUMN)61 Edmonton(COLUMN)cloudy(COLUMN)52(COLUMN)37 Havana(COLUMN)pt. cldy(COLUMN)83(COLUMN)73 Kingston(COLUMN)cloudy(COLUMN)86(COLUMN)78 Montego Bay(COLUMN)cloudy(COLUMN)86(COLUMN)73 Mexico City(COLUMN)haze(COLUMN)85(COLUMN)56 Monterrey(COLUMN)cloudy(COLUMN)85(COLUMN)68 Montreal(COLUMN)pt. cldy(COLUMN)77(COLUMN)57 Nassau(COLUMN)pt. cldy(COLUMN)82(COLUMN)73 Ottawa(COLUMN)clear(COLUMN)72(COLUMN)54 Regina(COLUMN)cloudy(COLUMN)52(COLUMN)36 St. Kitts(COLUMN)pt. cldy(COLUMN)86(COLUMN)74 St. Thomas(COLUMN)cloudy(COLUMN)84(COLUMN)74 Toronto(COLUMN)clear(COLUMN)55(COLUMN)45 Vancouver(COLUMN)clear(COLUMN)55(COLUMN)43 Veracruz(COLUMN)cloudy(COLUMN)87(COLUMN)70 Winnipeg(COLUMN)cloudy(COLUMN)59(COLUMN)34(END TABLE)