Climatological Report (Daily)
Issued by NWS
Issued by NWS
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683
CDUS46 KSEW 220123
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
623 PM PDT SUN SEP 21 2025
...................................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 21 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 69 303 PM 88 1952 70 -1 70
1974
MINIMUM 57 751 AM 39 1955 53 4 47
1960
AVERAGE 63 61 2 59
PRECIPITATION (IN)
TODAY 0.43 0.94 1981 0.06 0.37 0.00
MONTH TO DATE 0.49 1.02 -0.53 0.41
SINCE OCT 1 29.40 38.75 -9.35 35.72
SINCE JAN 1 16.00 22.81 -6.81 18.57
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 6
MONTH TO DATE 18 55 -37 61
SINCE SEP 1 18 55 -37 61
SINCE JUL 1 42 110 -68 99
COOLING
TODAY 0 1 -1 0
MONTH TO DATE 34 30 4 37
SINCE SEP 1 34 30 4 37
SINCE JAN 1 328 263 65 310
...................................................................
WIND (MPH)
RESULTANT WIND SPEED 6 RESULTANT WIND DIRECTION S (180)
HIGHEST WIND SPEED 16 HIGHEST WIND DIRECTION SW (220)
HIGHEST GUST SPEED 22 HIGHEST GUST DIRECTION S (200)
AVERAGE WIND SPEED 8.3
SKY COVER
AVERAGE SKY COVER 0.9
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
RAIN
LIGHT RAIN
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 96 600 AM
LOWEST 54 400 PM
AVERAGE 75
..........................................................
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 70 92 1990
MINIMUM TEMPERATURE (F) 53 37 1955
SUNRISE AND SUNSET
SEPTEMBER 21 2025.....SUNRISE 655 AM PDT SUNSET 708 PM PDT
SEPTEMBER 22 2025.....SUNRISE 657 AM PDT SUNSET 706 PM PDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
$$