Climatological Report (Daily)
Issued by NWS
Issued by NWS
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958
CDUS46 KSEW 170826
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
126 AM PDT THU SEP 17 2026
...................................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 16 2026...
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)
YESTERDAY
MAXIMUM 74 430 PM 91 1967 72 2 91
2025
MINIMUM 53 423 AM 44 1952 54 -1 55
1992
AVERAGE 64 63 1 73
PRECIPITATION (IN)
YESTERDAY 0.00 1.10 1947 0.05 -0.05 0.00
MONTH TO DATE 1.03 0.74 0.29 0.06
SINCE OCT 1 37.94 38.47 -0.53 28.97
SINCE JAN 1 21.16 22.53 -1.37 15.57
SNOWFALL (IN)
YESTERDAY 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
YESTERDAY 1 3 -2 0
MONTH TO DATE 46 36 10 11
SINCE SEP 1 46 36 10 11
SINCE JUL 1 71 91 -20 35
COOLING
YESTERDAY 0 1 -1 8
MONTH TO DATE 1 25 -24 30
SINCE SEP 1 1 25 -24 30
SINCE JAN 1 266 258 8 324
...................................................................
WIND (MPH)
RESULTANT WIND SPEED 8 RESULTANT WIND DIRECTION N (0)
HIGHEST WIND SPEED 16 HIGHEST WIND DIRECTION N (360)
HIGHEST GUST SPEED 21 HIGHEST GUST DIRECTION N (10)
AVERAGE WIND SPEED 9.0
SKY COVER
AVERAGE SKY COVER 0.1
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 93 500 AM
LOWEST 45 400 PM
AVERAGE 69
..........................................................
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 72 85 1991
MINIMUM TEMPERATURE (F) 54 41 1947
SUNRISE AND SUNSET
SEPTEMBER 17 2026.....SUNRISE 650 AM PDT SUNSET 717 PM PDT
SEPTEMBER 18 2026.....SUNRISE 651 AM PDT SUNSET 715 PM PDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
$$