211
CDUS46 KSEW 220117
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
617 PM PDT MON SEP 21 2026
...............................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 21 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 67 251 PM 88 1952 70 -3 69
1974
MINIMUM 52 623 AM 39 1955 53 -1 57
1960
AVERAGE 60 61 -1 63
PRECIPITATION (IN)
TODAY 0.00 0.94 1981 0.06 -0.06 0.43
MONTH TO DATE 1.03 1.02 0.01 0.49
SINCE OCT 1 37.94 38.75 -0.81 29.40
SINCE JAN 1 21.16 22.81 -1.65 16.00
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 4 1 2
MONTH TO DATE 66 55 11 18
SINCE SEP 1 66 55 11 18
SINCE JUL 1 91 110 -19 42
COOLING
TODAY 0 1 -1 0
MONTH TO DATE 2 30 -28 34
SINCE SEP 1 2 30 -28 34
SINCE JAN 1 267 263 4 328
...............................................................
WIND (MPH)
RESULTANT WIND SPEED 1 RESULTANT WIND DIRECTION W (270)
HIGHEST WIND SPEED 10 HIGHEST WIND DIRECTION S (200)
HIGHEST GUST SPEED 15 HIGHEST GUST DIRECTION SE (150)
AVERAGE WIND SPEED 4.9
SKY COVER
AVERAGE SKY COVER 0.4
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 93 100 AM
LOWEST 63 400 PM
AVERAGE 78
......................................................
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 70 92 1990
MINIMUM TEMPERATURE (F) 53 37 1955
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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