Washington: Today - Partly cloudy, high in 60s, low in 40s. Chance of rain is 20 per cent today, 10 per cent tonight. Tuesday - Partly cloudy, high in 60s.

Maryland and Virginia: Today - Partly cloudy and breezy, highs in 50s to near 70, lows in 30s and 40s. Chance of rain in mountians. Tuesday - Partly cloudy, highs in upper 40s to mid 60s.

Lower Potomac and Chesapeake Bay: Today - Partly cloudy with chance of scattered showers through tonight with northwesterly winds from 15 to 25 knots. Visibility should range from poor to good.

Extended Area Outlook: For Wednesday through Friday - Partly cloudy through period with chance of rain Thursday. Highs should average in 60s to low 70s, lows in 40s to near 50. Washington's normal temperature range for this time of year is from 71 to 50.

The National Weather Forecast for Today - Rainshowers will continue across the northeastern U.S. from the upper Ohio Valley across the lowe Great Lakes region and across the Atlantic Coast states from Virginia to Maine. A few rainshowers will also be scattered along the northern and central Pacific Coast. Elsewhere, fair or partly cloudy skies are forecast. It will be cooler across much of the middle Atlantic Coast states and across the Pacific states and the intermountain region. Little temperature change is expected elsewhere.

The National Weather Service forecasts that the Potomac River stage at Little Falls will remain near 3.8 feet through today.

Almanac data for April 25, 1977: Sun rises 6:18 a.m., sets 7:54 p.m., moon rises 10:43, sets 12:10 a.m. Tides: High, 12:15 a.m. and 7:01 a.m.; low, 12:30 p.m. and 7:42 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); Solomon Island (6 1/2); Point Lookout (7). Local Temp., Humidity(TABLE) Time(COLUMN)(COLUMN) SL12 midn. 73(COLUMN)66 1 a.m.(COLUMN)73(COLUMN)66 2 a.m.(COLUMN)71(COLUMN)71 4 a.m.(COLUMN)70(COLUMN)73 5 a.m.(COLUMN)69(COLUMN)76 6 a.m.(COLUMN)69(COLUMN)76 7 a.m.(COLUMN)67(COLUMN)84 8 a.m.(COLUMN)68(COLUMN)84 9 a.m.(COLUMN)69(COLUMN)90 10 a.m.(COLUMN)70(COLUMN)84 11 a.m.(COLUMN)71SH84 12 noon(COLUMN)72(COLUMN)79 1 p.m.(COLUMN)73(COLUMN)76 2 p.m.(COLUMN)74(COLUMN)74 3 p.m.(COLUMN)74(COLUMN)76 4 p.m.(COLUMN)74(COLUMN)76 5 p.m.(COLUMN)75(COLUMN)76 6 p.m.(COLUMN)76(COLUMN)71(END TABLE) Temperatures ending 8 a.m. (EDT) Yesterday(TABLE) City(COLUMN)H(COLUMN)L Albany(COLUMN)62(COLUMN)43 Albuquerque(COLUMN)77(COLUMN)58 Amarillo(COLUMN)71(COLUMN)44 Anchorage(COLUMN)57(COLUMN)41 Asheville(COLUMN)69(COLUMN)53 Atlanta(COLUMN)78(COLUMN)56 Atlantic City(COLUMN)80(COLUMN)60 Austin(COLUMN)80(COLUMN)58 Baltimore(COLUMN)83(COLUMN)67 Billings(COLUMN)74(COLUMN)41 Birmingham(COLUMN)78(COLUMN)55 Bismarck(COLUMN)62(COLUMN)23 Boise(COLUMN)88(COLUMN)54 Boston(COLUMN)73(COLUMN)45 Brownsville(COLUMN)85(COLUMN)64 Buffalo(COLUMN)50(COLUMN)43 Burlington, Vt.(COLUMN)53(COLUMN)43 Casper(COLUMN)71(COLUMN)34 Charleston, S.C.(COLUMN)82(COLUMN)67 Charleston, W.V.(COLUMN)75(COLUMN)57 Charlotte,N.C.(COLUMN)73(COLUMN)58 Cheyenne(COLUMN)66(COLUMN)34 Chicago(COLUMN)62(COLUMN)47 Cininnati(COLUMN)65(COLUMN)49 Cleveland(COLUMN)63(COLUMN)42 Columbia,S.C.(COLUMN)76(COLUMN)66 Columbus, Ohio(COLUMN)68(COLUMN)46 Dal.-Ft. Worth(COLUMN)73(COLUMN)53 Dayton(COLUMN)64(COLUMN)48 Denver(COLUMN)72(COLUMN)43 Des Moines(COLUMN)75(COLUMN)45 Detroit(COLUMN)50(COLUMN)45 Duluth(COLUMN)61(COLUMN)35 El Paso(COLUMN)83(COLUMN)55 Fairbanks(COLUMN)61(COLUMN)41 Fargo(COLUMN)62(COLUMN)31 Flagstaff(COLUMN)73(COLUMN)36 Great Falls(COLUMN)76(COLUMN)42 Harford(COLUMN)69(COLUMN)47 Helena(COLUMN)78(COLUMN)37 Honolulu(COLUMN)81(COLUMN)69 Houston(COLUMN)77(COLUMN)60 Indianapoli(COLUMN)58(COLUMN)49 Jackson, Miss.(COLUMN)76(COLUMN)55 Jacksonville(COLUMN)78(COLUMN)68 Juneau(COLUMN)46(COLUMN)41 Kansas City(COLUMN)71(COLUMN)50 Las Vegas(COLUMN)94(COLUMN)59 Little Rock(COLUMN)70(COLUMN)49 Los Angeles(COLUMN)85(COLUMN)56 Lousiville(COLUMN)67(COLUMN)54 Memphis(COLUMN)74(COLUMN)54 Miami Beach(COLUMN)80(COLUMN)73 Midland(COLUMN)74(COLUMN)53 Milwaukee(COLUMN)61(COLUMN)46 Mpis-St. Paul(COLUMN)73(COLUMN)40 Nastville(COLUMN)74(COLUMN)59 New Orleans(COLUMN)79(COLUMN)58 New York(COLUMN)76(COLUMN)46 Norfolk(COLUMN)84(COLUMN)66 North Platte(COLUMN)76(COLUMN)38 Oklahama City(COLUMN)70(COLUMN)45 Omaha(COLUMN)79(COLUMN)40 Orlando(COLUMN)$83(COLUMN)69 Philadelphia(COLUMN)85(COLUMN)58 Phoenix(COLUMN)96(COLUMN)74 Pittsburgh(COLUMN)67 43 Portland, Me.(COLUMN)59(COLUMN)40 Portland, Ore.(COLUMN)36(COLUMN)42 Providence(COLUMN)60(COLUMN)46 Raleigh(COLUMN)79(COLUMN)65 Rapid City(COLUMN)68(COLUMN)34 Reno(COLUMN)82(COLUMN)40 Richmond(COLUMN)84(COLUMN)66 St. Louis(COLUMN)54(COLUMN)47 St. Prbq.-Tampa(COLUMN)78(COLUMN)72 Salt Lake City(COLUMN)83(COLUMN)50 San Antonio(COLUMN)81(COLUMN)56 San Diego(COLUMN)76(COLUMN)57 San Francisco(COLUMN)73(COLUMN)52 San Juan, P.R.,(COLUMN)86(COLUMN)77 St. Ste. Marie(COLUMN)63(COLUMN)42 Seattle(COLUMN)72(COLUMN)48 Shereport(COLUMN)75(COLUMN)54 Shreveport(COLUMN)75(COLUMN)54 Sioux Falls(COLUMN)69(COLUMN)33 Spokane(COLUMN)87(COLUMN)61 Syracuse(COLUMN)57(COLUMN)47 Topeka(COLUMN)72(COLUMN)50 Tusco(COLUMN)85(COLUMN)68 Tulsa(COLUMN)71(COLUMN)49 Washington(COLUMN)80(COLUMN)67 Wichita(COLUMN)70(COLUMN)50(END TABLE) Temperatures Abrod Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen pt. cldy(COLUMN)1 p.m.(COLUMN)45 Amsterdam pt.cldy(COLUMN)1 p.m.(COLUMN)45 Athens clear(COLUMN)2 p.m.(COLUMN)68 Auckland cldy(COLUMN)midnight(COLUMN)57 Berlin hail(COLUMN)1 p.m.(COLUMN)48 Brussels pt. cldy(COLUMN)1 p.m.(COLUMN)52 Cairo pt.Cldy(COLUMN)2 p.m.(COLUMN)75 Casablanca clear(COLUMN)noon(COLUMN)68 Copenhagen cloudy(COLUMN)1 p.m.(COLUMN)43 Dublin pt. cldy(COLUMN)1 p.m.(COLUMN)54 Geneva rain(COLUMN)1 p.m.(COLUMN)52 Hong Kong clear(COLUMN)8 p.m.(COLUMN)79 Lisbon clear(COLUMN)noon(COLUMN)72 London pt. cldy(COLUMN)1 p.m.(COLUMN)54 Madrid clear(COLUMN)1 p.m.(COLUMN)73 Malta clear(COLUMN)1 p.m.(COLUMN)70 Manila clear(COLUMN)8 p.m.(COLUMN)84 Moscow rain(COLUMN)3 p.m.(COLUMN)52 New Delhi cloudy(COLUMN)5 p.m.(COLUMN)99 Nice Pt. Cldy(COLUMN)1 P.m.(COLUMN)64 Oslo cloudy(COLUMN)1 p.m.(COLUMN)41 Paris pt. Cldy(COLUMN)1 p.m.(COLUMN)55 Peking cloudy(COLUMN)8 p.m.(COLUMN)63 Rome cloudy(COLUMN)1 p.m.(COLUMN)63 Saigon clear(COLUMN)8 p.m.(COLUMN)84 Sofia pt. cldy(COLUMN)2 p.m.(COLUMN)70 Stockholm cloudy(COLUMN)1 p.m.(COLUMN)41 Sydney clear(COLUMN)10 p.m.(COLUMN)61 Tel Aviv loudy(COLUMN)2 p.m.(COLUMN)63 Tokyo cloudy(COLUMN)9 p.m.(COLUMN)63 Tunis clear(COLUMN)1 p.m.(COLUMN)81 Vienna pt. cldy(COLUMN)1 p.m.(COLUMN)61 Warsaw pt. cldy(COLUMN)1 P.m.(COLUMN)55(END TABLE) Temperatures (Western Hemisphere)(TABLE) Acapulco clear(COLUMN)93(COLUMN)75 Barbados cloudy(COLUMN)84(COLUMN)73 Bermuda pt. cldy(COLUMN)71(COLUMN)63 Edmonton clear(COLUMN)75(COLUMN)34 Havana pt.cldy(COLUMN)84(COLUMN)72 Kingston pt. cldy(COLUMN)86(COLUMN)74 Montego Bay cloudy(COLUMN)86(COLUMN)74 Mexico City haze(COLUMN)75(COLUMN)50 Monterrey pt. cldy(COLUMN)84(COLUMN)64 Montreal cloudy(COLUMN)54(COLUMN)45 Nassau pt.cldy(COLUMN)82(COLUMN)72 Ottawa cloudy(COLUMN)54(COLUMN)45 Regiina clear(COLUMN)63(COLUMN)28 St. Kitts fair(COLUMN)82(COLUMN)72 St. Thomas fair(COLUMN)84(COLUMN)73 Toronto cloudy(COLUMN)50(COLUMN)45 Vancouver clear(COLUMN)68(COLUMN)45 Veracruz pt. cldy(COLUMN)82(COLUMN)70 Winnipeg clear(COLUMN)57(COLUMN)21(END TABLE)