Washington: Today -- Rain, high in the low 60s, low near 50. The chance of precipitation is 70 percent. Sunday -- Partial clearing, breezy and mild, high in the mid 70s.

Maryland and Virginia: Today --Rain likely through tonight, high near 60, low in the 50s. Sunday --Partial clearing and mild high near 70.

Extended Area Outlook for Monday through Wednesday: A chance of showers around Tuesday, otherwise partly cloudy. Highs will be in the 50s or low 60s, lows in the 40s. Normal Washington temperatures for the period are a high of 63 and a low of 42.

Lower Potomac and Chesapeake Bay: Rain likely with winds shifting from the southeast to the northwest at 10 to 20 knots by nightfall. Visibility will decrease to less than 3 miles in rain. Waves in unprotected waters will average 2 feet or less on Saturday.

West Virginia: Showers and thunderstorms ending by nightfall, high in the low 70s, low in the upper 40s, Sunday -- Partly cloudy with a chance of showers, high in the 60s.

The National Weather Forecast for Today -- Rain showers and thunderstorms will be scattered from eastern Texas through the mid and lower Mississippi Valley, across most of the Great Lakes, the Ohio Valley and across the mid and south Atlantic Coast states. Snow will stretch from the upper Missippi Valley across the northern Plains and Rockies into the central Rockies. Elsewhere sunny or mostly sunny skies will prevail. Cold temperatures will continue over the northern Rockies and it will turn colder over the central Rockies, central and northern Plains. Mild conditions will continue over the south Atlantic Coast states and the Gulf Coast region. Elsewhere seasonal or near seasonal temperatures will prevail.

ALMANAC DATE FOR April 2, 1977 -- Sun rises 5:52 a.m., sets 6:32 p.m.; moon rises 5:09 p.m. sets 4:44 a.m. Tides: High 6:19 a.m. and 6:45 p.m., low 12:46 a.m., and 1:15 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 Lockout (7).

The Council of Governments' Air Quality Index for yesterday showed the high reading in the Washington area during the 3 p.m. period was 25 for the pollutant, photochemical oxidants. Index values between 24 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 fall to near 4.4 feet today.

Local Temp., Humidity (TABLE) Time(COLUMN)T(COLUMN)H 12 m'night(COLUMN)53(COLUMN)47 1 a.m.(COLUMN)53(COLUMN)47 2 a.m.(COLUMN)51(COLUMN)48 3 a.m.(COLUMN)49(COLUMN)54 4 a.m.(COLUMN)47(COLUMN)61 5 a.m.(COLUMN)56(COLUMN)63 6 a.m.(COLUMN)57(COLUMN)61 7 a.m.(COLUMN)58(COLUMN)61 8 a.m.(COLUMN)52(COLUMN)54 9 a.m.(COLUMN)55(COLUMN)51 10 a.m.(COLUMN)57(COLUMN)45 11 a.m.(COLUMN)53(COLUMN)46 12 noon(COLUMN)60(COLUMN)44 1 p.m.(COLUMN)61(COLUMN)41 2 p.m.(COLUMN)62(COLUMN)39 3 p.m.(COLUMN)64(COLUMN)35 4 p.m.(COLUMN)64(COLUMN)37 5 p.m.(COLUMN)64(COLUMN)35 6 p.m.(COLUMN)63(COLUMN)35 7 p.m.(COLUMN)59(COLUMN)44(END TABLE)

Temperatures ending 7 a.m. (EST) yesterday: (TABLE) City(COLUMN)H(COLUMN)L. Albany(COLUMN)68(COLUMN)31 Albuquerque(COLUMN)68(COLUMN)35 Amarillo(COLUMN)56(COLUMN)39 Anchorage(COLUMN)33(COLUMN)24 Asheville(COLUMN)67(COLUMN)39 Atlanta(COLUMN)75(COLUMN)50 Atlantic City(COLUMN)68(COLUMN)38 Austin(COLUMN)67(COLUMN)51 Baltimore(COLUMN)67(COLUMN)38 Billings(COLUMN)43(COLUMN)31 Birmingham(COLUMN)73(COLUMN)53 Bismarck(COLUMN)40(COLUMN)20 Boise(COLUMN)49(COLUMN)34 Boston(COLUMN)68(COLUMN)39 Brownsville(COLUMN)75(COLUMN)68 Buffalo(COLUMN)52(COLUMN)28 Burlington, Vt.(COLUMN)58(COLUMN)30 Charleston, S.C.(COLUMN)85(COLUMN)62 Ch'rlstn, W. Va.(COLUMN)72(COLUMN)32 Charlotte(COLUMN)76(COLUMN)50 Cheyenne(COLUMN)53(COLUMN)23 Chicago(COLUMN)45(COLUMN)35 Cincinnati(COLUMN)56(COLUMN)32 Cleveland(COLUMN)56(COLUMN)35 Columbia, S.C.(COLUMN)87(COLUMN)48 Columbus(COLUMN)56(COLUMN)30 Dal.-Ft-Worth(COLUMN)66(COLUMN)51 Dayton(COLUMN)52(COLUMN)32 Denver(COLUMN)63(COLUMN)27 Des Moines(COLUMN)50(COLUMN)40 Detroit(COLUMN)53(COLUMN)32 Duluth(COLUMN)39(COLUMN)27 El Passo(COLUMN)76(COLUMN)53 Fairbanks(COLUMN)16(COLUMN)06 Fargo(COLUMN)43(COLUMN)33 Flagstaff(COLUMN)50(COLUMN)23 Great Falls(COLUMN)38(COLUMN)25 Hartford(COLUMN)67(COLUMN)42 Helena(COLUMN)40(COLUMN)24 Honolulu(COLUMN)80(COLUMN)71 Houston(COLUMN)71(COLUMN)53 Indianapolis(COLUMN)49(COLUMN)32 Jackson(COLUMN)70(COLUMN)50 Jacksonville(COLUMN)80(COLUMN)63 Juneau(COLUMN)46(COLUMN)32 Kansas City(COLUMN)54(COLUMN)44 Las Vegas(COLUMN)64(COLUMN)38 Little Rock(COLUMN)62(COLUMN)47 Los Angeles(COLUMN)61(COLUMN)48 Louisville(COLUMN)59(COLUMN)38 Memphis(COLUMN)65(COLUMN)47 Miami Beach(COLUMN)79(COLUMN)73 Midland(COLUMN)67(COLUMN)40 Milwaukee(COLUMN)43(COLUMN)32 Mpls-St.-Paul(COLUMN)43(COLUMN)30 Nashville(COLUMN)66(COLUMN)38 New Orleans(COLUMN)76(COLUMN)63 New York(COLUMN)70(COLUMN)39 Norfolk(COLUMN)80(COLUMN)46 North Platte(COLUMN)53(COLUMN)31 Oklahoma City(COLUMN)65(COLUMN)46 Omaha(COLUMN)52(COLUMN)44 Orlando(COLUMN)86(COLUMN)67 Philadelphia(COLUMN)70(COLUMN)43 Phoenix(COLUMN)78(COLUMN)52 Pittsburgh(COLUMN)58(COLUMN)35 Portland, Me.(COLUMN)55(COLUMN)32 Portland, Ore.(COLUMN)53(COLUMN)43 Providence(COLUMN)69(COLUMN)38 raleigh(COLUMN)79(COLUMN)44 Rapid City(COLUMN)41(COLUMN)24 Reno(COLUMN)53(COLUMN)45 Richmond(COLUMN)77(COLUMN)34 St. Louis(COLUMN)54(COLUMN)37 St. Prbg. Tampa(COLUMN)85(COLUMN)66 Salt Lake City(COLUMN)49(COLUMN)33 San Antonio(COLUMN)69(COLUMN)51 San Diego(COLUMN)60(COLUMN)51 San Francisco(COLUMN)61(COLUMN)48 San Juan(COLUMN)84(COLUMN)72 St. Sta. Marie(COLUMN)34(COLUMN)17 Seattle(COLUMN)51(COLUMN)44 Shreveport(COLUMN)69(COLUMN)51 Sioux Falls(COLUMN)48(COLUMN)40 Spokane(COLUMN)52(COLUMN)28 Syracuse(COLUMN)54(COLUMN)27 Topeka(COLUMN)58(COLUMN)46 Tucson(COLUMN)74(COLUMN)46 Tulsa(COLUMN)59(COLUMN)46 Washington(COLUMN)69(COLUMN)46 Wichita(COLUMN)53(COLUMN)41(END TABLE)

Temperatures Abroad Yesterday (TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp Aberdeen(COLUMN)rain(COLUMN)1 p.m.(COLUMN)50 Amsterdam(COLUMN)rain(COLUMN)1 p.m.(COLUMN)48 Ankara(COLUMN)cloudy(COLUMN)3 p.m.(COLUMN)77 Athens(COLUMN)cloudy(COLUMN)2 p.m.(COLUMN)64 Auckland(COLUMN)cloudy(COLUMN)midnight(COLUMN)64 Berlin(COLUMN)rain(COLUMN)1 p.m.(COLUMN)39 Birmingham pt.(COLUMN)cldy.(COLUMN)1 p.m.(COLUMN)50 Brussels(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)50 Cairo(COLUMN)clear(COLUMN)2 p.m.(COLUMN)88 Casablanca(COLUMN)clear(COLUMN)noon(COLUMN)63 Copenhagen(COLUMN)rain(COLUMN)1 p.m.(COLUMN)36 Dublin pt.(COLUMN)cldy.(COLUMN)1 p.m.(COLUMN)46 Geneva(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)48 H. Kong pt(COLUMN)cldy.(COLUMN)8 p.m.(COLUMN)68 Lisbon(COLUMN)cloudy(COLUMN)noon(COLUMN)57 London(COLUMN)rain(COLUMN)1 p.m.(COLUMN)52 Madrid pt(COLUMN)cldy.(COLUMN)1 p.m.(COLUMN)63 Malta(COLUMN)rain(COLUMN)1 p.m.(COLUMN)59 Manila(COLUMN)clear(COLUMN)8 p.m.(COLUMN)82 Moscow(COLUMN)snow(COLUMN)3 p.m.(COLUMN)32 New Delhi(COLUMN)clear(COLUMN)5 p.m.(COLUMN)93 Nice(COLUMN)Clear(COLUMN)1 p.m.(COLUMN)57 Oslo(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)28 Paris(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)54 Peking(COLUMN)clear(COLUMN)8 p.m.(COLUMN)50 Rome(COLUMN)clear(COLUMN)1 p.m.(COLUMN)59 Saigon pt(COLUMN)cldy.(COLUMN)8 p.m.(COLUMN)84 Sofia(COLUMN)cloudy(COLUMN)2 p.m.(COLUMN)55 Stockholm(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)32 Sydney(COLUMN)clear(COLUMN)10 p.m.(COLUMN)73 Tel Aviv(COLUMN)pt. cldy.(COLUMN)2 p.m.(COLUMN)79 Tokyo(COLUMN)pt. clear(COLUMN)9 p.m.(COLUMN)54 Tunis(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)59 Vienna(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)48 Warsaw(COLUMN)clear(COLUMN)10 p.m.(COLUMN)37(END TABLE) (TABLE) Temperatures (Western Hemisphere) City(COLUMN)Weather(COLUMN)Hish(COLUMN)Low Acapulco(COLUMN)clear(COLUMN)84(COLUMN)71 Barbados(COLUMN)cloudy(COLUMN)82(COLUMN)75 Bermuda(COLUMN)cloudy(COLUMN)28(COLUMN)66 Cogota(COLUMN)fog(COLUMN)68(COLUMN)49 Calgary(COLUMN)pt. cldy.(COLUMN)41(COLUMN)19 Culiacan(COLUMN)pt. cldy.(COLUMN)86(COLUMN)54 Edmonton(COLUMN)pt. cldy.(COLUMN)39(COLUMN)25 Havana(COLUMN)pt. cldy.(COLUMN)84(COLUMN)68 Kingston(COLUMN)clear(COLUMN)84(COLUMN)73 Mohteco Bay(COLUMN)clear(COLUMN)83(COLUMN)72 Mexico City(COLUMN)clear(COLUMN)88(COLUMN)61 Monterrey(COLUMN)cloudy(COLUMN)75(COLUMN)63 Montreal(COLUMN)clear(COLUMN)54(COLUMN)21 Nassau(COLUMN)clear(COLUMN)82(COLUMN)63 Ottawa(COLUMN)clear(COLUMN)50(COLUMN)25 Regina(COLUMN)clear(COLUMN)45(COLUMN)16 St. Kitts(COLUMN)clear(COLUMN)83(COLUMN)72 St. Thomas(COLUMN)cloudy(COLUMN)85(COLUMN)73 Toronto(COLUMN)clear(COLUMN)48(COLUMN)23 Vancouver(COLUMN)pt. cldy.(COLUMN)54(COLUMN)41 Veracruz(COLUMN)pt. cldy.(COLUMN)88(COLUMN)70 Winnipeg(COLUMN)cloudy(COLUMN)45(COLUMN)28(END TABLE)