922
CDUS46 KSEW 160827
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
127 AM PDT TUE SEP 16 2025
...............................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 15 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 70 403 PM 93 1967 72 -2 64
MINIMUM 52 617 AM 42 1952 54 -2 53
AVERAGE 61 63 -2 59
PRECIPITATION (IN)
YESTERDAY 0.00 0.69 1959 0.05 -0.05 0.02
MONTH TO DATE 0.06 0.69 -0.63 0.39
SINCE OCT 1 28.97 38.42 -9.45 35.70
SINCE JAN 1 15.57 22.48 -6.91 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 4 3 1 6
MONTH TO DATE 11 33 -22 29
SINCE SEP 1 11 33 -22 29
SINCE JUL 1 35 88 -53 67
COOLING
YESTERDAY 0 1 -1 0
MONTH TO DATE 22 24 -2 37
SINCE SEP 1 22 24 -2 37
SINCE JAN 1 316 257 59 310
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WIND (MPH)
RESULTANT WIND SPEED 5 RESULTANT WIND DIRECTION N (0)
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION N (350)
HIGHEST GUST SPEED 20 HIGHEST GUST DIRECTION NW (310)
AVERAGE WIND SPEED 7.2
SKY COVER
AVERAGE SKY COVER 0.3
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 86 600 AM
LOWEST 50 100 PM
AVERAGE 68
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THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 72 91 1967
MINIMUM TEMPERATURE (F) 54 44 1952
1992
SUNRISE AND SUNSET
SEPTEMBER 16 2025.....SUNRISE 648 AM PDT SUNSET 718 PM PDT
SEPTEMBER 17 2025.....SUNRISE 650 AM PDT SUNSET 716 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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