342
CDUS46 KSEW 210827
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
127 AM PDT MON SEP 21 2026
...............................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 20 2026...
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)
YESTERDAY
MAXIMUM 70 419 PM 88 1974 71 -1 73
MINIMUM 50 557 AM 40 1949 53 -3 52
AVERAGE 60 62 -2 63
PRECIPITATION (IN)
YESTERDAY 0.00 1.05 1972 0.05 -0.05 0.00
MONTH TO DATE 1.03 0.96 0.07 0.06
SINCE OCT 1 37.94 38.69 -0.75 28.97
SINCE JAN 1 21.16 22.75 -1.59 15.57
SNOWFALL (IN)
YESTERDAY 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
YESTERDAY 5 4 1 2
MONTH TO DATE 61 51 10 16
SINCE SEP 1 61 51 10 16
SINCE JUL 1 86 106 -20 40
COOLING
YESTERDAY 0 1 -1 0
MONTH TO DATE 2 29 -27 34
SINCE SEP 1 2 29 -27 34
SINCE JAN 1 267 262 5 328
...............................................................
WIND (MPH)
RESULTANT WIND SPEED 4 RESULTANT WIND DIRECTION N (350)
HIGHEST WIND SPEED 10 HIGHEST WIND DIRECTION NE (30)
HIGHEST GUST SPEED 15 HIGHEST GUST DIRECTION N (20)
AVERAGE WIND SPEED 5.6
SKY COVER
AVERAGE SKY COVER 0.2
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 97 200 AM
LOWEST 57 300 PM
AVERAGE 77
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THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 70 88 1952
1974
MINIMUM TEMPERATURE (F) 53 39 1955
1960
SUNRISE AND SUNSET
SEPTEMBER 21 2026.....SUNRISE 655 AM PDT SUNSET 709 PM PDT
SEPTEMBER 22 2026.....SUNRISE 656 AM PDT SUNSET 706 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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