139
CDUS46 KSEW 280828
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
128 AM PDT SUN SEP 28 2025
...............................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 27 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 75 335 PM 89 1967 68 7 66
MINIMUM 55 1159 PM 35 1972 51 4 52
AVERAGE 65 60 5 59
PRECIPITATION (IN)
YESTERDAY 0.00 1.04 1981 0.07 -0.07 0.03
MONTH TO DATE 0.49 1.39 -0.90 0.62
SINCE OCT 1 29.40 39.12 -9.72 35.93
SINCE JAN 1 16.00 23.18 -7.18 18.78
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 6 -6 6
MONTH TO DATE 38 85 -47 81
SINCE SEP 1 38 85 -47 81
SINCE JUL 1 62 140 -78 119
COOLING
YESTERDAY 0 0 0 0
MONTH TO DATE 34 30 4 42
SINCE SEP 1 34 30 4 42
SINCE JAN 1 328 263 65 315
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WIND (MPH)
RESULTANT WIND SPEED 2 RESULTANT WIND DIRECTION N (0)
HIGHEST WIND SPEED 16 HIGHEST WIND DIRECTION N (350)
HIGHEST GUST SPEED 21 HIGHEST GUST DIRECTION N (350)
AVERAGE WIND SPEED 5.5
SKY COVER
AVERAGE SKY COVER 0.7
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 83 1100 PM
LOWEST 42 100 PM
AVERAGE 63
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THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 68 86 2017
MINIMUM TEMPERATURE (F) 51 38 1946
1950
SUNRISE AND SUNSET
SEPTEMBER 28 2025.....SUNRISE 705 AM PDT SUNSET 654 PM PDT
SEPTEMBER 29 2025.....SUNRISE 706 AM PDT SUNSET 652 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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