163
CDUS46 KSEW 180826
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
126 AM PDT THU SEP 18 2025
...............................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 17 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 78 339 PM 85 1991 72 6 63
MINIMUM 59 1159 PM 41 1947 54 5 53
AVERAGE 69 62 7 58
PRECIPITATION (IN)
YESTERDAY 0.00 1.49 2010 0.06 -0.06 T
MONTH TO DATE 0.06 0.80 -0.74 0.39
SINCE OCT 1 28.97 38.53 -9.56 35.70
SINCE JAN 1 15.57 22.59 -7.02 18.55
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 3 -3 7
MONTH TO DATE 11 39 -28 42
SINCE SEP 1 11 39 -28 42
SINCE JUL 1 35 94 -59 80
COOLING
YESTERDAY 4 1 3 0
MONTH TO DATE 34 26 8 37
SINCE SEP 1 34 26 8 37
SINCE JAN 1 328 259 69 310
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WIND (MPH)
RESULTANT WIND SPEED 3 RESULTANT WIND DIRECTION N (20)
HIGHEST WIND SPEED 21 HIGHEST WIND DIRECTION N (10)
HIGHEST GUST SPEED 27 HIGHEST GUST DIRECTION N (20)
AVERAGE WIND SPEED 8.2
SKY COVER
AVERAGE SKY COVER 0.1
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 75 1000 PM
LOWEST 40 300 PM
AVERAGE 58
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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 2025.....SUNRISE 651 AM PDT SUNSET 714 PM PDT
SEPTEMBER 19 2025.....SUNRISE 652 AM PDT SUNSET 712 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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