612
CDUS46 KSEW 120117
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
617 PM PDT THU SEP 11 2025
...............................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 11 2025...
VALID TODAY AS OF 0500 PM LOCAL TIME.
CLIMATE NORMAL PERIOD 1991 TO 2020
CLIMATE RECORD PERIOD 1945 TO 2025
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST
VALUE (LST) VALUE VALUE FROM YEAR
NORMAL
...............................................................
TEMPERATURE (F)
TODAY
MAXIMUM 67 424 PM 93 2013 73 -6 67
MINIMUM 56 936 AM 40 1952 55 1 53
AVERAGE 62 64 -2 60
PRECIPITATION (IN)
TODAY 0.01 0.58 1956 0.05 -0.04 0.24
MONTH TO DATE 0.06 0.49 -0.43 0.24
SINCE OCT 1 28.97 38.22 -9.25 35.55
SINCE JAN 1 15.57 22.28 -6.71 18.40
SNOWFALL (IN)
TODAY 0.0 MM MM 0.0
MONTH TO DATE 0.0 0.0
SINCE OCT 1 2.3 0.3
SINCE JUL 1 0.0 0.0
SNOW DEPTH 0
DEGREE DAYS
HEATING
TODAY 3 2 1 5
MONTH TO DATE 5 22 -17 9
SINCE SEP 1 5 22 -17 9
SINCE JUL 1 29 77 -48 47
COOLING
TODAY 0 1 -1 0
MONTH TO DATE 21 20 1 37
SINCE SEP 1 21 20 1 37
SINCE JAN 1 315 253 62 310
...............................................................
WIND (MPH)
RESULTANT WIND SPEED 5 RESULTANT WIND DIRECTION SW (210)
HIGHEST WIND SPEED 14 HIGHEST WIND DIRECTION S (200)
HIGHEST GUST SPEED 19 HIGHEST GUST DIRECTION S (200)
AVERAGE WIND SPEED 5.1
SKY COVER
AVERAGE SKY COVER 0.8
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
LIGHT RAIN
FOG
FOG W/VISIBILITY <= 1/4 MILE
RELATIVE HUMIDITY (PERCENT)
HIGHEST 100 400 AM
LOWEST 68 400 PM
AVERAGE 84
......................................................
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 73 85 1961
1975
MINIMUM TEMPERATURE (F) 54 44 1949
1962
SUNRISE AND SUNSET
SEPTEMBER 11 2025.....SUNRISE 642 AM PDT SUNSET 728 PM PDT
SEPTEMBER 12 2025.....SUNRISE 643 AM PDT SUNSET 726 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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