Climatological Report (Daily)
Issued by NWS
Issued by NWS
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985
CDUS46 KSEW 160117
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
617 PM PDT TUE SEP 15 2026
...................................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 15 2026...
VALID TODAY AS OF 0500 PM LOCAL TIME.
CLIMATE NORMAL PERIOD 1991 TO 2020
CLIMATE RECORD PERIOD 1945 TO 2026
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST
VALUE (LST) VALUE VALUE FROM YEAR
NORMAL
...................................................................
TEMPERATURE (F)
TODAY
MAXIMUM 68 328 PM 93 1967 72 -4 70
MINIMUM 54 222 AM 42 1952 54 0 52
AVERAGE 61 63 -2 61
PRECIPITATION (IN)
TODAY 0.01 0.69 1959 0.05 -0.04 0.00
MONTH TO DATE 1.03 0.69 0.34 0.06
SINCE OCT 1 37.94 38.42 -0.48 28.97
SINCE JAN 1 21.16 22.48 -1.32 15.57
SNOWFALL (IN)
TODAY 0.0 MM MM 0.0
MONTH TO DATE 0.0 0.0
SINCE OCT 1 3.0 2.3
SINCE JUL 1 0.0 0.0
SNOW DEPTH 0
DEGREE DAYS
HEATING
TODAY 4 3 1 4
MONTH TO DATE 45 33 12 11
SINCE SEP 1 45 33 12 11
SINCE JUL 1 70 88 -18 35
COOLING
TODAY 0 1 -1 0
MONTH TO DATE 1 24 -23 22
SINCE SEP 1 1 24 -23 22
SINCE JAN 1 266 257 9 316
...................................................................
WIND (MPH)
RESULTANT WIND SPEED 6 RESULTANT WIND DIRECTION N (10)
HIGHEST WIND SPEED 16 HIGHEST WIND DIRECTION N (360)
HIGHEST GUST SPEED 21 HIGHEST GUST DIRECTION N (360)
AVERAGE WIND SPEED 6.8
SKY COVER
AVERAGE SKY COVER 0.9
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
LIGHT RAIN
RELATIVE HUMIDITY (PERCENT)
HIGHEST 93 600 AM
LOWEST 52 300 PM
AVERAGE 73
..........................................................
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 72 91 1967
2025
MINIMUM TEMPERATURE (F) 54 44 1952
1992
SUNRISE AND SUNSET
SEPTEMBER 15 2026.....SUNRISE 647 AM PDT SUNSET 721 PM PDT
SEPTEMBER 16 2026.....SUNRISE 648 AM PDT SUNSET 719 PM PDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
$$