643
CDUS46 KSEW 180117
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
617 PM PDT SUN AUG 17 2025
...............................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR AUGUST 17 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 74 336 PM 96 1977 78 -4 79
MINIMUM 60 352 AM 45 1951 57 3 56
AVERAGE 67 68 -1 68
PRECIPITATION (IN)
TODAY 0.00 0.93 1995 0.03 -0.03 0.47
MONTH TO DATE 1.14 0.44 0.70 0.47
SINCE OCT 1 28.91 37.20 -8.29 34.12
SINCE JAN 1 15.51 21.26 -5.75 16.97
SNOWFALL (IN)
TODAY MM 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 MM
DEGREE DAYS
HEATING
TODAY 0 1 -1 0
MONTH TO DATE 2 10 -8 2
SINCE JUN 1 117 159 -42 141
SINCE JUL 1 23 41 -18 9
COOLING
TODAY 2 3 -1 3
MONTH TO DATE 59 64 -5 63
SINCE JUN 1 220 189 31 246
SINCE JAN 1 223 199 24 253
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WIND (MPH)
RESULTANT WIND SPEED 3 RESULTANT WIND DIRECTION SW (210)
HIGHEST WIND SPEED 10 HIGHEST WIND DIRECTION W (270)
HIGHEST GUST SPEED 14 HIGHEST GUST DIRECTION S (200)
AVERAGE WIND SPEED 5.1
SKY COVER
AVERAGE SKY COVER 0.9
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 87 600 AM
LOWEST 48 400 PM
AVERAGE 68
......................................................
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 78 88 1991
MINIMUM TEMPERATURE (F) 57 47 1951
SUNRISE AND SUNSET
AUGUST 17 2025........SUNRISE 609 AM PDT SUNSET 817 PM PDT
AUGUST 18 2025........SUNRISE 610 AM PDT SUNSET 815 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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