971
CDUS46 KSEW 190117
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
617 PM PDT THU SEP 18 2025
...............................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 18 2025...
VALID TODAY AS OF 0500 PM LOCAL TIME.
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)
TODAY
MAXIMUM 72 321 PM 85 1991 71 1 70
MINIMUM 53 519 AM 38 1947 53 0 55
AVERAGE 63 62 1 63
PRECIPITATION (IN)
TODAY 0.00 0.81 2021 0.05 -0.05 T
MONTH TO DATE 0.06 0.85 -0.79 0.39
SINCE OCT 1 28.97 38.58 -9.61 35.70
SINCE JAN 1 15.57 22.64 -7.07 18.55
SNOWFALL (IN)
TODAY 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
TODAY 2 4 -2 2
MONTH TO DATE 13 43 -30 44
SINCE SEP 1 13 43 -30 44
SINCE JUL 1 37 98 -61 82
COOLING
TODAY 0 1 -1 0
MONTH TO DATE 34 27 7 37
SINCE SEP 1 34 27 7 37
SINCE JAN 1 328 260 68 310
...............................................................
WIND (MPH)
RESULTANT WIND SPEED 6 RESULTANT WIND DIRECTION NW (330)
HIGHEST WIND SPEED 20 HIGHEST WIND DIRECTION N (350)
HIGHEST GUST SPEED 24 HIGHEST GUST DIRECTION NE (40)
AVERAGE WIND SPEED 6.9
SKY COVER
AVERAGE SKY COVER 0.4
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 90 500 AM
LOWEST 47 300 PM
AVERAGE 69
......................................................
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 71 82 1999
MINIMUM TEMPERATURE (F) 53 40 1947
1957
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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