Washington: Today - Rain, high in the mid 60s, low near 50. The chance of rain is 100 percent today and 90 percent tonight. Wind will be variable at from 5 to 10 mph. Monday - Rain, high near 60.

Maryland and Virginia: Today - Rain, highs from the mid 50s to the 60s, low from the 40s to the 50s. Monday - Rain, high from the 50s to the low 60s.

Lower Potomac and Chesapeake Bay: Today - Rain with visibility of less than 3 miles. Wind will be from the southeast at from 15 to 25 knots today becoming variable tonight. Waves in unprotected waters will be from 2 to 4 feet.

Extended Area Forecast for Tuesday through Thursday: Rain possible through Wednesday, clearing by Thursday. Highs will in the 60s, lows from the upper 40s to the 50s. Normal Washington temperatures for the period are a high of 77 and a low of 56.

West Virginia: Today - Rain highs from the low 50s to near 60, lows in the 40s. Monday - Clearing, highs from the low 50s to near 60.

Almanac Data for today: The sun rises 5:57 a.m., sets 8:12 p.m.; moon rises 3:05 p.m., sets 2:55 a.m. Tides: high 8:34 a.m. and 9:03 p.m., low 1:38 a.m. and 1:49 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 (3/4), Solomons Island (6 1/4), Point Lookout (7).

The Council of Governments' Air Quality Index for yesterday showed the high reading in the Washington area during the noon period was 19 for the pollutant, photochemical oxidants. Index values between zero and 25 indicate good 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 air quality will be good.

The National Weather Service forecasts the Potomac River stage at Little Falls should be near 4.5 feet today.

The Nation Yesterday. Heavy rain caused flooding in southeastern Wisconsin. Thunderstorms also produced a tornado near Ann Arbor and another near Clayton, N.C. Thunderstorms extended from central New England through Florida across the Appalachians to the Ohio and Tennessee valleys and the Great Lakes. Showers and occasional thundershowers remained over the Pacific Northwest, from the Oregon and Washington coasts into western Montana. Skies remained partly cloudy from the Mississippi valley through much of the Rockies and temperatures were seasonably mild. Sunny skies extended over the Southwest, but temperatures reached into the 90s and occasionally past the 100-degree mark. The high temperature for the nation was 109 degrees at Coolidge, Ariz., and Palm Springs.

The National Weather Forecast for today - Showers will extend from the Great Lakes through the Ohio Valley across the Appalachians and the Atlantic Coast from the Carolinas through New England. Showers will also extend from the northern third of California through Oregon and Washington into western Montana. Temperatures will be cool through the areas of showers into inland portions of the Gulf states and eastern portions of the Mississippi Valley. It will be warm from Florida across the Gulf Coast and through the Southwest. Elsewhere, temperatures will be seasonably mild.

Washington data for yesterday: Highest temperature since midnight yesterday, 74 degrees at 1:42 p.m. Lowest temperature since midnight, 65 degrees at 5:25 a.m. Deficiency/Excess of temperature since May 1, 38 degrees. Deficiency/Excess of temperature since Jan. 1, 252 degrees. Record high temperature for today, 93 degrees in 1956. Record low temperature for today, 41 degrees in 1928. Relative humidity: maximum, 84 percent at 6 a.m.; minimum, 66 percent at 2 p.m. 24-hour precipitation, .13 inches. Deficiency/Excess of precipitation since May 1, .83 inches. Deficiency/Excess of precipitation since Jan. 1, 2.96 inches. Highest observed wind since 8 a.m., 21 miles per hour from the south southeast at 11:53 a.m. Peak gust since 8 a.m., 30 miles per hour from the southeast at 7:14 p.m. Local Temps., Humidity(TABLE) Times(COLUMN)T.(COLUMN)H. 12 mid.(COLUMN)69(COLUMN)63 1 a.m.(COLUMN)68(COLUMN)68 2 a.m.(COLUMN)68(COLUMN)70 3 a.m.(COLUMN)68(COLUMN)73 4 a.m.(COLUMN)67(COLUMN)78 5 a.m.(COLUMN)66(COLUMN)81 6 a.m.(COLUMN)65(COLUMN)84 7 a.m.(COLUMN)65(COLUMN)84 8 a.m.(COLUMN)66(COLUMN)84 9 a.m.(COLUMN)67(COLUMN)81 10 a.m.(COLUMN)68(COLUMN)79 11 a.m.(COLUMN)70(COLUMN)73 12 noon(COLUMN)72(COLUMN)71 1 p.m.(COLUMN)73(COLUMN)69 2 p.m.(COLUMN)74(COLUMN)66 3 p.m.(COLUMN)73(COLUMN)69 4 p.m.(COLUMN)71(COLUMN)71 5 p.m.(COLUMN)69(COLUMN)73 6 p.m.(COLUMN)67(COLUMN)78 7 p.m.(COLUMN)66(COLUMN)81 8 p.m.(COLUMN)67(COLUMN)78 9 p.m.(COLUMN)67(COLUMN)81 10 p.m.(COLUMN)67(COLUMN)87 11 p.m.(COLUMN)67(COLUMN)87(END TABLE) Temperatures ending 8 p.m. (EDT) yesterday(TABLE) City(COLUMN)L.(COLUMN)H. Albany(COLUMN)53(COLUMN)65 Albuquerque(COLUMN)47(COLUMN)84 Amarillo(COLUMN)48(COLUMN)79 Anchorage(COLUMN)46(COLUMN)61 Asheville(COLUMN)60(COLUMN)74 Atlanta(COLUMN)61(COLUMN)73 Atlantic City(COLUMN)53(COLUMN)57 Austin(COLUMN)64(COLUMN)84 Baltimore(COLUMN)62(COLUMN)70 Billings(COLUMN)42(COLUMN)74 Birmingham(COLUMN)73(COLUMN)61 Bismarck(COLUMN)38(COLUMN)69 Boise(COLUMN)43(COLUMN)81 Boston(COLUMN)52(COLUMN)70 Brownsville(COLUMN)78(COLUMN)89 Buffalo(COLUMN)57(COLUMN)69 Burlington(COLUMN)56(COLUMN)76 Casper(COLUMN)35(COLUMN)74 Charleston, S.C.(COLUMN)66(COLUMN)85 Charleston, W.Va.(COLUMN)56(COLUMN)69 Charlotte(COLUMN)62(COLUMN)76 Cheyenne(COLUMN)33(COLUMN)74 Chicago(COLUMN)45(COLUMN)57 Cincinnati(COLUMN)48(COLUMN)61 Cleveland(COLUMN)59(COLUMN)67 Columbia, S.C.(COLUMN)65(COLUMN)80 Columbus, Ohio(COLUMN)56(COLUMN)63 Dal.-Ft. Worth(COLUMN)58(COLUMN)62 Dayton(COLUMN)53(COLUMN)62 Denver(COLUMN)36(COLUMN)78 Des Moines(COLUMN)50(COLUMN)68 Detriot(COLUMN)54(COLUMN)65 Duluth(COLUMN)42(COLUMN)64 El Paso(COLUMN)58(COLUMN)95 Fairbanks(COLUMN)44(COLUMN)67 Fargo(COLUMN)33(COLUMN)67 Flagstaff(COLUMN)35(COLUMN)80 Great Falls(COLUMN)45(COLUMN)73 Hartford(COLUMN)49(COLUMN)72 Helena(COLUMN)43(COLUMN)73 Honolulu(COLUMN)71(COLUMN)86 Houston(COLUMN)70(COLUMN)85 Indianapolis(COLUMN)51(COLUMN)59 Jacksonville(COLUMN)66(COLUMN)88 Juneau(COLUMN)42(COLUMN)62 Las Vegas(COLUMN)61(COLUMN)101 Little Rock(COLUMN)54(COLUMN)74 Los Angeles(COLUMN)66(COLUMN)93 Louisville(COLUMN)50(COLUMN)61 Memphis(COLUMN)74(COLUMN)62 Miami Beach(COLUMN)70(COLUMN)86 Midland-Odessa(COLUMN)52(COLUMN)83 Milwaukee(COLUMN)41(COLUMN)44 Mpls.-St. Paul(COLUMN)46(COLUMN)69 Nashville(COLUMN)55(COLUMN)66 New Orleans(COLUMN)74(COLUMN)86 New York(COLUMN)55(COLUMN)70 Norfolk(COLUMN)66(COLUMN)78 North Platte(COLUMN)34(COLUMN)72 Oklahoma City(COLUMN)55(COLUMN)76 Omaha(COLUMN)46(COLUMN)68 Orlando(COLUMN)70(COLUMN)92 Philadelphia(COLUMN)58(COLUMN)72 Phoenix(COLUMN)65(COLUMN)108 Pittsburgh(COLUMN)53(COLUMN)60 Portland, Maine(COLUMN)43(COLUMN)62 Portland, Ore.(COLUMN)52(COLUMN)58 Providence(COLUMN)49(COLUMN)65 Raleigh(COLUMN)58(COLUMN)77 Rapid City(COLUMN)35(COLUMN)69 Reno(COLUMN)34(COLUMN)82 Richmond(COLUMN)59(COLUMN)75 St. Louis(COLUMN)50(COLUMN)63 St. Prbg.-Tampa(COLUMN)65(COLUMN)57 Salt Lake City(COLUMN)47(COLUMN)85 San Antonio(COLUMN)68(COLUMN)85 San Diego(COLUMN)64(COLUMN)84 San Francisco(COLUMN)60(COLUMN)78 San Juan(COLUMN)73(COLUMN)86 St. Ste. Marie(COLUMN)43(COLUMN)49 Seattle(COLUMN)51(COLUMN)59 Shreveport(COLUMN)55(COLUMN)81 Spokane(COLUMN)45(COLUMN)60 Syracuse(COLUMN)59(COLUMN)69 Topeka(COLUMN)50(COLUMN)71 Tucson(COLUMN)60(COLUMN)102 Tulsa(COLUMN)54(COLUMN)73 Washington(COLUMN)65(COLUMN)74 Wichita(COLUMN)49(COLUMN)74(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp Aberdeen(COLUMN)Cloudy(COLUMN)1 p.m.(COLUMN)48 Amsterdam(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)50 Ankara(COLUMN)pt. Cldy(COLUMN)3 p.m.(COLUMN)55 Athens(COLUMN)clear(COLUMN)2 p.m.(COLUMN)66 Auckland(COLUMN)cloudy(COLUMN)midnite(COLUMN)64 Berlin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)46 Birmingham(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)52 Brussels(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)50 Cairo(COLUMN)clear(COLUMN)2 p.m.(COLUMN)82 Casablanca(COLUMN)pt. cldy(COLUMN)noon(COLUMN)68 Copenhagen(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)46 Dublin(COLUMN)rain(COLUMN)1 p.m.(COLUMN)48 Geneva(COLUMN)rain(COLUMN)1 p.m.(COLUMN)46 Hong Kong(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)75 Jerusalem(COLUMN)clear(COLUMN)2p.m.(COLUMN)70 Lisbon(COLUMN)clear(COLUMN)noon(COLUMN)72 London(COLUMN)clear(COLUMN)1 p.m.(COLUMN)52 Madrid(COLUMN)clear(COLUMN)1 p.m.(COLUMN)72 Malta(COLUMN)clear(COLUMN)1 p.m.(COLUMN)68 Manila(COLUMN)clear(COLUMN)8 p.m.(COLUMN)84 Moscow(COLUMN)pt. cldy(COLUMN)3 p.m.(COLUMN)50 New Delhi(COLUMN)clear(COLUMN)5 p.m.(COLUMN)104 Nice(COLUMN)clear(COLUMN)1 p.m.(COLUMN)64 Oslo(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)43 Paris(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)52 Peking(COLUMN)clear(COLUMN)8 p.m.(COLUMN)73 Rome(COLUMN)rain(COLUMN)1 p.m.(COLUMN)63 Saigon(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)81 Sofia(COLUMN)pt. cldy(COLUMN)2 p.m.(COLUMN)53 Stockholm(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)43 Sydney(COLUMN)clear(COLUMN)10 p.m.(COLUMN)52 Tokyo(COLUMN)pt. cldy(COLUMN)9 p.m.(COLUMN)64 Tunis(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)77 Vienna(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)54 Warsaw(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)52(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)clear(COLUMN)88(COLUMN)77 Barbados(COLUMN)pt. cldy(COLUMN)85(COLUMN)61 Bermuda(COLUMN)pt. cldy(COLUMN)72(COLUMN)68 Bogota(COLUMN)cloudy(COLUMN)66(COLUMN)48 Calgary(COLUMN)clear(COLUMN)34(COLUMN)57 Culiacan(COLUMN)cloudy(COLUMN)97(COLUMN)68 Havana(COLUMN)cloudy(COLUMN)90(COLUMN)73 Kingston(COLUMN)fair(COLUMN)90(COLUMN)72 Montego Bay(COLUMN)fair(COLUMN)86(COLUMN)75 Mexico City(COLUMN)haze(COLUMN)88(COLUMN)53 Monterrey(COLUMN)pt. cldy(COLUMN)101(COLUMN)75 Nassau(COLUMN)fair(COLUMN)86(COLUMN)73 St. Kitts(COLUMN)pt. cldy(COLUMN)87(COLUMN)75 St. Thomas(COLUMN)fair(COLUMN)87(COLUMN)75 Veracruz(COLUMN)fog(COLUMN)96(COLUMN)72(END TABLE)