Washington: Today - Sunny, high near 60, low in low 40s.The chance of rain is near zero through tonight. Wind will be from the north at from 10 to 15 mph. Monday - Increasingly cloudy, high in the mid 50s.

Maryland and Virginia: Today - Sunny, highs from the 50s to the 60s, lows from the mid 30s to near 50. Monday - Increasingly cloudy, highs from the 50s to near 70. There is a chance of rain in southwestern Virginia.

Lower Potomac and Chesapeake Bay - Partly cloudy with visibility of more than 5 miles. Wind will be from the north at from 10 to 15 knots. Waves in unprotected waters will be from 2 to 3 feet.

Extended Area Forecast for Tuesday through Thursday: Chance of rain on Tuesday, clearing on Wednesday and fair on Thursday. Highs will be from the 60s to the low 70s, lows from the 40s to the low 50s. Normal Washington temperatures for the period are a high of 63 and a low of 42.

West Virginia: Today - Partly cloudy, highs from the 50s to the mid 60s, lows from the 30s to the mid 40s.Monday - Rain, highs from the upper 50s to the 60s.

The Council of Governments' Air Quality Index for yesterday showed the high reading in the Washington area during the 2 p.m. to 3 p.m. period was 10 for the pollutant, photochemical oxidants. Index values between zero and 24 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 retire their activity. The forecast for today indicates that the air quality will deteriorate.

The National Weather Service forecasts the Potomac River stage at Little Falls should be near 5.5 feet today.

The National Weather Forecast for today - Rain and thundershowers, some possibly severe in southern Missouri, Arkansas and eastern Oklahoma will fall over most of the Grat plains and middle Mississippi Valley. In the Rocky Mountains, and in the intermountain region, widely scattered rain is expected, with snow in higher elevations. Some snow will also fall from the eastern Great Lakes into upper New England.

Washington data at 7 p.m. (EST) yesterday: Highest temperature since 7 a.m. yesterday, 83 degrees at 2:45 p.m. Lowest temperature since midnight, 47 degrees at 3:40 a.m. Excess of temperature since April 1, 17 degrees. Deficiency of temperature since Jan. 1, 246 degrees. Record high temperature for today, 89 degrees in 1963. Record low temperature for today, 23 degrees in 1907. Relative humidity: Maximum, 80 percent at 4:00 a.m. Minimum, 19 percent at 5:00 p.m. Deficiency of precipitation since Apr. 1, .1 inches. Excess of precipitation since Jan. 1, 3.51 inches. Highest observed wind since 7 a.m. 32 miles per hour from the south-west at 2:53 p.m. Peak gust since 7 a.m., 49 miles per hour from the Southwest at 2:16 p.m. Local Temps., Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 mid.(COLUMN)50(COLUMN)68 1 a.m.(COLUMN)51(COLUMN)66 2 a.m.(COLUMN)49(COLUMN)68 3 a.m.(COLUMN)49(COLUMN)71 4 a.m.(COLUMN)47(COLUMN)80 5 a.m.(COLUMN)47(COLUMN)80 6 a.m.(COLUMN)48(COLUMN)77 7 a.m.(COLUMN)51(COLUMN)69 8 a.m.(COLUMN)55(COLUMN)67 9 a.m.(COLUMN)62(COLUMN)56 10 a.m.(COLUMN)67(COLUMN)51 11 a.m.(COLUMN)76(COLUMN)39 12 noon(COLUMN)81(COLUMN)33 1 p.m.(COLUMN)86(COLUMN)26 2 p.m.(COLUMN)87(COLUMN)73 3 p.m.(COLUMN)88(COLUMN)21 4 p.m.(COLUMN)86(COLUMN)21 5 p.m.(COLUMN)87(COLUMN)19 6 p.m.(COLUMN)86(COLUMN)20(END TABLE) Temperature ending 7 a.m. (EST) esterday:(TABLE) City(COLUMN)H.(COLUMN)L. Albany(COLUMN)49(COLUMN)35 Albuquerque(COLUMN)80(COLUMN)50 Amarillo(COLUMN)86(COLUMN)52 Anchorage(COLUMN)44(COLUMN)33 Asheville(COLUMN)78(COLUMN)40 Atlanta(COLUMN)82(COLUMN)52 Atlantic City(COLUMN)58(COLUMN)45 Austin(COLUMN)80(COLUMN)60 Baltimore(COLUMN)64(COLUMN)40 Billings(COLUMN)56(COLUMN)36 Birmingham(COLUMN)84(COLUMN) 50 Bismarck(COLUMN)62(COLUMN)29 Boise(COLUMN)66(COLUMN)46 Boston(COLUMN)52(COLUMN)41 Brownsville(COLUMN)81(COLUMN)63 Buffalo(COLUMN)53(COLUMN)44 Burlington(COLUMN)43(COLUMN)31 Casper(COLUMN)70(COLUMN)38 Charleston, SC(COLUMN)74(COLUMN)61 Charleston, W Va(COLUMN)79(COLUMN)61 Charlotte(COLUMN)79(COLUMN)52 Cheyenne(COLUMN)70(COLUMN)40 Chicago(COLUMN)83(COLUMN)54 Cincinnati(COLUMN)80(COLUMN)59 Cleveland(COLUMN)70(COLUMN)60 Columbia, S.C.(COLUMN)81(COLUMN)55 Columbus(COLUMN)77(COLUMN)60 Dal. Ft. Worth(COLUMN)83(COLUMN)59 Dayton(COLUMN)79(COLUMN)51 Denver(COLUMN)77(COLUMN)46 Des Moines(COLUMN)84(COLUMN)42 Detroit(COLUMN)65(COLUMN)48 Duluth(COLUMN)48(COLUMN)26 El Paso(COLUMN)87(COLUMN)61 Fairbanks(COLUMN)22(COLUMN)05 Fargo(COLUMN)58(COLUMN)24 Flagstaff(COLUMN)60(COLUMN)37 Great Falls(COLUMN)49(COLUMN)38 Hartford(COLUMN)45(COLUMN)38 Helena(COLUMN)52(COLUMN)36 Honolulu(COLUMN)84(COLUMN)72 Houston(COLUMN)78(COLUMN)60 Indianapolis(COLUMN)80(COLUMN)63 Jackson, Miss.(COLUMN)85(COLUMN)49 Jacksonsville(COLUMN)78(COLUMN)49 Juneau(COLUMN)44(COLUMN)34 Kansas City(COLUMN)82(COLUMN)51 Las Vegas(COLUMN)71(COLUMN)52 Little Rock(COLUMN)83(COLUMN)58 Los Angeles(COLUMN)68(COLUMN)53 Louisville(COLUMN)83(COLUMN)65 Memphis(COLUMN)84(COLUMN)62 Miami Beach(COLUMN)75(COLUMN)62 Midland-Odessa(COLUMN)93(COLUMN)61 Milwaukee(COLUMN)77(COLUMN)47 Mpls. St. Paul(COLUMN)71(COLUMN)33 Nashville(COLUMN)86(COLUMN)58 New Orleans(COLUMN)84(COLUMN)52 New York(COLUMN)59(COLUMN)47 Norfolk(COLUMN)62(COLUMN)53 North Platte(COLUMN)82(COLUMN)36 Oklahoma city(COLUMN)85(COLUMN)59 Omaha(COLUMN)84(COLUMN)40 Orlando(COLUMN)83(COLUMN)54 Philadelphia(COLUMN)59(COLUMN)40 Phoenix(COLUMN)87(COLUMN)62 Pittsburgh(COLUMN)58(COLUMN)50 Portland, Me.(COLUMN)49(COLUMN)28 Portland, Ore.(COLUMN)69(COLUMN)45 Providence(COLUMN)50(COLUMN)38 Raleigh(COLUMN)78(COLUMN)55 Rapid City(COLUMN)67(COLUMN)34 Reno(COLUMN)52(COLUMN)41 Richmond(COLUMN)69(COLUMN)50 St. Lous(COLUMN)86(COLUMN)62 St Pete-Tampa(COLUMN)84(COLUMN)52 Salt Lake City(COLUMN)70(COLUMN)47 San Antonio(COLUMN)79(COLUMN)62 San Diego(COLUMN)68(COLUMN)59 San Francisco(COLUMN)60(COLUMN)51 San Juan(COLUMN)87(COLUMN)73 St Ste. Marie(COLUMN)38(COLUMN)34 Seattle(COLUMN)67(COLUMN)46 Shreveport(COLUMN)34(COLUMN)50 Sioux Falls(COLUMN)76(COLUMN)32 Spokane(COLUMN)58(COLUMN)44 Syracuse(COLUMN)51(COLUMN)40 Topeka(COLUMN)86(COLUMN)49 Tucson(COLUMN)87(COLUMN)67 Tulsa(COLUMN)84(COLUMN)59 Washington(COLUMN)64(COLUMN)47 Wichita(COLUMN)85(COLUMN)52(END TABLE) Temperature (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)Clear(COLUMN)86(COLUMN)73 Barbados(COLUMN)pt. cldy.(COLUMN)84(COLUMN)79 Bermuda(COLUMN)Pt. Cldy.(COLUMN)64(COLUMN)60 Calgary(COLUMN)Cloudy(COLUMN)41(COLUMN)28 Cullacan(COLUMN)pt. cldy.(COLUMN)91(COLUMN)59 Edmonton(COLUMN)cloudy(COLUMN)36(COLUMN)28 Havana(COLUMN)pt. cldy(COLUMN)86(COLUMN)75 Montego Bay(COLUMN)fair(COLUMN)82(COLUMN)70 Mexico City(COLUMN)Clear(COLUMN)81(COLUMN)52 Monterrey(COLUMN)clear(COLUMN)82(COLUMN)61 Montreal(COLUMN)sleet(COLUMN)41(COLUMN)30 Nassau(COLUMN)fair(COLUMN)79(COLUMN)66 Ottawa(COLUMN)rain(COLUMN)43(COLUMN)30 Regina(COLUMN)cloudy(COLUMN)46(COLUMN)25 St. Kitts(COLUMN)pt. cldy(COLUMN)85(COLUMN)73 St. Thomas(COLUMN)pta. cldy(COLUMN)86(COLUMN)71 Toronto(COLUMN)cloudy(COLUMN)45(COLUMN)34 Vancouver(COLUMN)cloudy(COLUMN)52(COLUMN)39 Veracruz(COLUMN)cloudy(COLUMN)81(COLUMN)61 Winnipeg(COLUMN)clear(COLUMN)41(COLUMN)14(END TABLE)