750
CDUS46 KSEW 170826
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
126 AM PDT WED SEP 17 2025
...............................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 16 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 91R 414 PM 91 1967 72 19 68
MINIMUM 55 308 AM 44 1952 54 1 50
1992
AVERAGE 73 63 10 59
PRECIPITATION (IN)
YESTERDAY 0.00 1.10 1947 0.05 -0.05 0.00
MONTH TO DATE 0.06 0.74 -0.68 0.39
SINCE OCT 1 28.97 38.47 -9.50 35.70
SINCE JAN 1 15.57 22.53 -6.96 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 6
MONTH TO DATE 11 36 -25 35
SINCE SEP 1 11 36 -25 35
SINCE JUL 1 35 91 -56 73
COOLING
YESTERDAY 8 1 7 0
MONTH TO DATE 30 25 5 37
SINCE SEP 1 30 25 5 37
SINCE JAN 1 324 258 66 310
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WIND (MPH)
RESULTANT WIND SPEED 3 RESULTANT WIND DIRECTION E (70)
HIGHEST WIND SPEED 18 HIGHEST WIND DIRECTION SE (120)
HIGHEST GUST SPEED 29 HIGHEST GUST DIRECTION SE (140)
AVERAGE WIND SPEED 8.3
SKY COVER
AVERAGE SKY COVER 0.0
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 90 400 AM
LOWEST 22 300 PM
AVERAGE 56
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THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 72 85 1991
MINIMUM TEMPERATURE (F) 54 41 1947
SUNRISE AND SUNSET
SEPTEMBER 17 2025.....SUNRISE 650 AM PDT SUNSET 716 PM PDT
SEPTEMBER 18 2025.....SUNRISE 651 AM PDT SUNSET 714 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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