Oregon, Washington Heat Records

Image (click to enlarge): Oregon maximum temperature forecast for Monday, July 27, from National Weather Service

For previous record temperature posts, see:
Record Heat
Record Cold

Noon PDT, July 27 Update: July 26 actual highs:

Portland          93 (record 99)
Eugene            94 (record 102)
Seattle (SeaTac)  89 (record 92)  

July 27 Update: A Heat Advisory is in effect from noon Monday to 1 am PDT on Thursday for the Seattle-Tacoma area:

HOT AND HUMID CONDITIONS ARE EXPECTED MONDAY AND TUESDAY. HIGH
TEMPERATURES FROM THE UPPER 80S TO MID 90S EARLY IN THE WEEK WILL
BE ACCOMPANIED BY RATHER HUMID CONDITIONS AND ONLY LIGHT BREEZES.
TEMPERATURES AT NIGHT WILL REMAIN QUITE WARM...FALLING ONLY INTO
THE 60S FOR A COUPLE HOURS LATE AT NIGHT IN MOST PLACES. EVEN
HOTTER CONDITIONS ARE EXPECTED WEDNESDAY AND POSSIBLY THURSDAY AS
TEMPERATURES RISE WELL INTO THE 90S. A FEW LOCATIONS IN THE
INTERIOR SOUTH OF SEATTLE MAY REACH 100 DEGREES WEDNESDAY AFTERNOON. 

An Excessive Heat Warning is in effect from noon Monday to 10 pm PDT Wednesday for the Portland-Vancouver area:

THE WARMEST WEATHER OF THE SEASON IS EXPECTED IN THE INTERIOR OF
SOUTHWEST WASHINGTON AND NORTHWEST OREGON BEGINNING MONDAY AND
LIKELY CONTINUING AT LEAST THROUGH WEDNESDAY. AFTERNOON
TEMPERATURES AT LOWER ELEVATIONS OF THE INTERIOR OF SOUTHWEST
WASHINGTON AND NORTHWEST OREGON ON MONDAY WILL BE IN AT LEAST THE
UPPER 90S AND POSSIBLY EVEN NEAR 100...WITH A GOOD CHANCE OF
REACHING OR EXCEEDING 100 TUESDAY AND AGAIN WEDNESDAY. MANY AREAS
OF THE CASCADES AND IN THE COAST RANGE WILL LIKELY PUSH WELL UP
INTO THE 90S DURING THIS PERIOD AS WELL. IN ADDITION...LOW
TEMPERATURES WILL BE RISING INTO THE 60S AS WELL...RESTRICTING ANY
RELIEF FROM THE HEAT AT NIGHT. 

1 PM PDT Update: Following highs today in the low 80s in the Greater Portland area, temperatures are forecast to rise through the weekend and into next week:

Saturday  90°
Sunday    90-95°
Monday   100°
Tuesday  100°
Wednesday 95°
Thursday  90°  

The National Weather Service has published the following Seattle heat statistics:

 3 DAYS...AVERAGE NUMBER OF DAYS IN A YEAR WITH HIGHS OF AT LEAST 90.
 
 5 DAYS...RECORD NUMBER OF CONSECUTIVE DAYS WITH HIGHS AT             
          LEAST 90 DEGREES ( AUGUST 7TH THROUGH AUGUST 11TH...1981 ).
 
 7 DAYS...RECORD NUMBER OF DAYS IN A MONTH WITH HIGHS AT LEAST
          90 (SET JULY 1958 ). 
 
 9 DAYS...RECORD NUMBER OF DAYS IN A YEAR WITH HIGHS AT LEAST         
          90 ( SET IN 1958 )
 
 15 YEARS...NUMBER OF YEARS WITH 0 DAYS WITH A HIGH OF AT LEAST       
            90 DEGREES. ( 23 PERCENT OF THE TIME...15 OUT OF 65
            YEARS ). LAST OCCURRED IN 2005.  

Original post:
In anticipation of a heat wave expected to last into next week, the National Weather Service office in Portland, Oregon has published some heat records for the northwest portion of the state:

PERIOD OF RECORD:  
PORTLAND...1926-CURRENT  
SALEM......1892-CURRENT  
EUGENE.....1890-CURRENT  
  
*********************************************************  
AVERAGE NUMBER OF DAYS PER YEAR:  
  
                         PORTLAND      SALEM       EUGENE  
90 DEGREES OR ABOVE.....    11           15          11   
100 DEGREES OR ABOVE....LESS THAN 1   ABOUT 1    LESS THAN 1  
  
**********************************************************  
NUMBER OF DAYS SO FAR THIS YEAR (2009):  
  
                         PORTLAND      SALEM       EUGENE  
90 DEGREES OR ABOVE.....      8          7           6   
100 DEGREES OR ABOVE....      0          0           0  
  
**********************************************************  
RECORD TOTAL NUMBER OF DAYS IN A YEAR:  
  
                         PORTLAND      SALEM       EUGENE  
90 DEGREES OR ABOVE.....  23/1987    34/1958      31/1958  
100 DEGREES OR ABOVE....   5/1977     7/1988       5/1978  
  
**********************************************************  
RECORD NUMBER CONSECUTIVE DAYS OF HIGH TEMPERATURES   
FOR THE MONTH OF JULY:  
  
90 DEGREES OR ABOVE.....RANK  #DAYS   START DATE  
FOR PORTLAND............ 1.    6      7-22-1996  
                         2.    6      7-13-1973  
                         3.    6      7-13-1941  
                         4.    5      7-20-2006  
                         5.    5      7-19-1994  
   
  
FOR SALEM............... 1.   10      7-13-1938  
                         2.    9      7-05-1945  
                         3.    9      7-13-1896  
                         4.    8      7-21-1962  
                         5.    8      7-18-1946  
  
FOR EUGENE.............. 1.   11      7-13-1938    
                         2.    9      7-21-1939  
                         3.    8      7-20-2006  
                         4.    8      7-21-1962  
                         5.    8      7-18-1946  
  
100 DEGREES OR ABOVE....RANK  #DAYS   START DATE  
FOR PORTLAND............ 1.    5      7-13-1941  
                         2.    3      7-19-1994  
                         3.    2      7-23-2004  
                         4.    2      7-16-1979  
                         5.    2      7-30-1965   
  
FOR SALEM............... 1.    4      7-19-1994  
                         2.    4      7-13-1941  
                         3.    3      7-15-1979  
                         4.    3      7-13-1935  
                         5.    3      7-22-1928  
  
FOR EUGENE.............. 1.    3      7-22-2006  
                         2.    3      7-22-1928  
                         3.    2      7-23-2004  
                         4.    2      7-28-2003  
                         5.    2      7-26-1998