278
CDUS46 KSEW 220827
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
127 AM PDT MON SEP 22 2025
...............................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 21 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 69 303 PM 88 1952 70 -1 70
1974
MINIMUM 57 1149 PM 39 1955 53 4 47
1960
AVERAGE 63 61 2 59
PRECIPITATION (IN)
YESTERDAY 0.43 0.94 1981 0.06 0.37 0.00
MONTH TO DATE 0.49 1.02 -0.53 0.41
SINCE OCT 1 29.40 38.75 -9.35 35.72
SINCE JAN 1 16.00 22.81 -6.81 18.57
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 2 4 -2 6
MONTH TO DATE 18 55 -37 61
SINCE SEP 1 18 55 -37 61
SINCE JUL 1 42 110 -68 99
COOLING
YESTERDAY 0 1 -1 0
MONTH TO DATE 34 30 4 37
SINCE SEP 1 34 30 4 37
SINCE JAN 1 328 263 65 310
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WIND (MPH)
RESULTANT WIND SPEED 4 RESULTANT WIND DIRECTION S (160)
HIGHEST WIND SPEED 16 HIGHEST WIND DIRECTION SW (220)
HIGHEST GUST SPEED 22 HIGHEST GUST DIRECTION S (200)
AVERAGE WIND SPEED 7.4
SKY COVER
AVERAGE SKY COVER 0.8
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
RAIN
LIGHT RAIN
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 96 600 AM
LOWEST 52 600 PM
AVERAGE 74
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THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 70 92 1990
MINIMUM TEMPERATURE (F) 53 37 1955
SUNRISE AND SUNSET
SEPTEMBER 22 2025.....SUNRISE 657 AM PDT SUNSET 706 PM PDT
SEPTEMBER 23 2025.....SUNRISE 658 AM PDT SUNSET 704 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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