878
CDUS46 KSEW 130117
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
617 PM PDT SAT SEP 12 2026
...............................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 12 2026...
VALID TODAY AS OF 0500 PM LOCAL TIME.
CLIMATE NORMAL PERIOD 1991 TO 2020
CLIMATE RECORD PERIOD 1945 TO 2026
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST
VALUE (LST) VALUE VALUE FROM YEAR
NORMAL
...............................................................
TEMPERATURE (F)
TODAY
MAXIMUM 66 416 PM 85 1961 73 -7 72
1975
MINIMUM 53 614 AM 44 1949 54 -1 58
1962
AVERAGE 60 64 -4 65
PRECIPITATION (IN)
TODAY 0.00 0.60 2004 0.05 -0.05 0.00
MONTH TO DATE 0.35 0.54 -0.19 0.06
SINCE OCT 1 37.26 38.27 -1.01 28.97
SINCE JAN 1 20.48 22.33 -1.85 15.57
SNOWFALL (IN)
TODAY 0.0 MM MM 0.0
MONTH TO DATE 0.0 0.0
SINCE OCT 1 3.0 2.3
SINCE JUL 1 0.0 0.0
SNOW DEPTH 0
DEGREE DAYS
HEATING
TODAY 5 2 3 0
MONTH TO DATE 29 24 5 5
SINCE SEP 1 29 24 5 5
SINCE JUL 1 54 79 -25 29
COOLING
TODAY 0 1 -1 0
MONTH TO DATE 1 21 -20 21
SINCE SEP 1 1 21 -20 21
SINCE JAN 1 266 254 12 315
...............................................................
WIND (MPH)
RESULTANT WIND SPEED 3 RESULTANT WIND DIRECTION NW (300)
HIGHEST WIND SPEED 10 HIGHEST WIND DIRECTION NW (300)
HIGHEST GUST SPEED 13 HIGHEST GUST DIRECTION W (290)
AVERAGE WIND SPEED 3.8
SKY COVER
AVERAGE SKY COVER 0.9
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 83 600 AM
LOWEST 54 400 PM
AVERAGE 69
......................................................
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 73 87 1999
MINIMUM TEMPERATURE (F) 54 39 1952
SUNRISE AND SUNSET
SEPTEMBER 12 2026.....SUNRISE 643 AM PDT SUNSET 727 PM PDT
SEPTEMBER 13 2026.....SUNRISE 644 AM PDT SUNSET 725 PM PDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
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