Climatological Report (Daily)
Issued by NWS
Issued by NWS
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CDUS46 KSEW 130122
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
622 PM PDT FRI SEP 12 2025
...................................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 12 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 72 357 PM 85 1961 73 -1 68
1975
MINIMUM 58 734 AM 44 1949 54 4 55
1962
AVERAGE 65 64 1 62
PRECIPITATION (IN)
TODAY 0.00 0.60 2004 0.05 -0.05 0.00
MONTH TO DATE 0.06 0.54 -0.48 0.24
SINCE OCT 1 28.97 38.27 -9.30 35.55
SINCE JAN 1 15.57 22.33 -6.76 18.40
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 0 2 -2 3
MONTH TO DATE 5 24 -19 12
SINCE SEP 1 5 24 -19 12
SINCE JUL 1 29 79 -50 50
COOLING
TODAY 0 1 -1 0
MONTH TO DATE 21 21 0 37
SINCE SEP 1 21 21 0 37
SINCE JAN 1 315 254 61 310
...................................................................
WIND (MPH)
RESULTANT WIND SPEED 2 RESULTANT WIND DIRECTION S (190)
HIGHEST WIND SPEED 8 HIGHEST WIND DIRECTION NE (40)
HIGHEST GUST SPEED 14 HIGHEST GUST DIRECTION N (10)
AVERAGE WIND SPEED 4.5
SKY COVER
AVERAGE SKY COVER 0.8
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 90 500 AM
LOWEST 55 400 PM
AVERAGE 73
..........................................................
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 73 87 1999
MINIMUM TEMPERATURE (F) 54 39 1952
SUNRISE AND SUNSET
SEPTEMBER 12 2025.....SUNRISE 643 AM PDT SUNSET 726 PM PDT
SEPTEMBER 13 2025.....SUNRISE 644 AM PDT SUNSET 724 PM PDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
$$