596
CDUS46 KSEW 100826
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
126 AM PDT WED SEP 10 2025
...............................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 9 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 70 500 PM 89 1963 74 -4 67
MINIMUM 58 1120 PM 40 1952 55 3 58
AVERAGE 64 64 0 63
PRECIPITATION (IN)
YESTERDAY 0.00 0.61 1982 0.04 -0.04 T
MONTH TO DATE 0.05 0.39 -0.34 T
SINCE OCT 1 28.96 38.12 -9.16 35.31
SINCE JAN 1 15.56 22.18 -6.62 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 1 2 -1 2
MONTH TO DATE 2 18 -16 2
SINCE SEP 1 2 18 -16 2
SINCE JUL 1 26 73 -47 40
COOLING
YESTERDAY 0 2 -2 0
MONTH TO DATE 21 18 3 37
SINCE SEP 1 21 18 3 37
SINCE JAN 1 315 251 64 310
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WIND (MPH)
RESULTANT WIND SPEED 6 RESULTANT WIND DIRECTION N (0)
HIGHEST WIND SPEED 13 HIGHEST WIND DIRECTION N (10)
HIGHEST GUST SPEED 17 HIGHEST GUST DIRECTION N (20)
AVERAGE WIND SPEED 6.7
SKY COVER
AVERAGE SKY COVER 0.6
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 87 500 AM
LOWEST 63 600 PM
AVERAGE 75
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THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 74 92 2022
MINIMUM TEMPERATURE (F) 55 39 1952
SUNRISE AND SUNSET
SEPTEMBER 10 2025.....SUNRISE 641 AM PDT SUNSET 730 PM PDT
SEPTEMBER 11 2025.....SUNRISE 642 AM PDT SUNSET 728 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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