Climatological Report (Daily)
Issued by NWS
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102
CDUS46 KSEW 180827
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
127 AM PDT FRI SEP 18 2026
...................................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 17 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 77 341 PM 85 1991 72 5 78
MINIMUM 54 557 AM 41 1947 54 0 59
AVERAGE 66 62 4 69
PRECIPITATION (IN)
YESTERDAY 0.00 1.49 2010 0.06 -0.06 0.00
MONTH TO DATE 1.03 0.80 0.23 0.06
SINCE OCT 1 37.94 38.53 -0.59 28.97
SINCE JAN 1 21.16 22.59 -1.43 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 0 3 -3 0
MONTH TO DATE 46 39 7 11
SINCE SEP 1 46 39 7 11
SINCE JUL 1 71 94 -23 35
COOLING
YESTERDAY 1 1 0 4
MONTH TO DATE 2 26 -24 34
SINCE SEP 1 2 26 -24 34
SINCE JAN 1 267 259 8 328
...................................................................
WIND (MPH)
RESULTANT WIND SPEED 3 RESULTANT WIND DIRECTION N (350)
HIGHEST WIND SPEED 13 HIGHEST WIND DIRECTION N (360)
HIGHEST GUST SPEED 16 HIGHEST GUST DIRECTION NE (30)
AVERAGE WIND SPEED 5.8
SKY COVER
AVERAGE SKY COVER 0.1
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 90 500 AM
LOWEST 42 700 PM
AVERAGE 66
..........................................................
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 71 85 1991
MINIMUM TEMPERATURE (F) 53 38 1947
SUNRISE AND SUNSET
SEPTEMBER 18 2026.....SUNRISE 651 AM PDT SUNSET 715 PM PDT
SEPTEMBER 19 2026.....SUNRISE 652 AM PDT SUNSET 713 PM PDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
$$