899
CDUS46 KSEW 090826
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
126 AM PDT TUE SEP 09 2025
...............................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 8 2025...
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)
YESTERDAY
MAXIMUM 75 416 PM 85 1993 74 1 75
2011
MINIMUM 58 541 AM 43 1950 55 3 58
AVERAGE 67 64 3 67
PRECIPITATION (IN)
YESTERDAY 0.00 0.60 1979 0.05 -0.05 0.00
1994
MONTH TO DATE 0.05 0.35 -0.30 T
SINCE OCT 1 28.96 38.08 -9.12 35.31
SINCE JAN 1 15.56 22.14 -6.58 18.16
SNOWFALL (IN)
YESTERDAY 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
YESTERDAY 0 2 -2 0
MONTH TO DATE 1 16 -15 0
SINCE SEP 1 1 16 -15 0
SINCE JUL 1 25 71 -46 38
COOLING
YESTERDAY 2 2 0 2
MONTH TO DATE 21 16 5 37
SINCE SEP 1 21 16 5 37
SINCE JAN 1 315 249 66 310
...............................................................
WIND (MPH)
RESULTANT WIND SPEED 3 RESULTANT WIND DIRECTION NW (320)
HIGHEST WIND SPEED 13 HIGHEST WIND DIRECTION N (20)
HIGHEST GUST SPEED 16 HIGHEST GUST DIRECTION N (20)
AVERAGE WIND SPEED 5.4
SKY COVER
AVERAGE SKY COVER 0.7
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
HAZE
RELATIVE HUMIDITY (PERCENT)
HIGHEST 90 500 AM
LOWEST 50 500 PM
AVERAGE 70
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THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 74 89 1963
MINIMUM TEMPERATURE (F) 55 40 1952
SUNRISE AND SUNSET
SEPTEMBER 9 2025.....SUNRISE 639 AM PDT SUNSET 733 PM PDT
SEPTEMBER 10 2025.....SUNRISE 641 AM PDT SUNSET 730 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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