840
CDUS46 KSEW 180830
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
130 AM PDT TUE AUG 18 2026
...............................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR AUGUST 17 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 80 359 PM 96 1977 78 2 74
MINIMUM 54 645 AM 45 1951 57 -3 60
AVERAGE 67 68 -1 67
PRECIPITATION (IN)
YESTERDAY 0.00 0.93 1995 0.03 -0.03 0.00
MONTH TO DATE T 0.44 -0.44 1.14
SINCE OCT 1 36.35 37.20 -0.85 28.91
SINCE JAN 1 19.57 21.26 -1.69 15.51
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 0 1 -1 0
MONTH TO DATE 1 10 -9 2
SINCE JUN 1 116 159 -43 117
SINCE JUL 1 21 41 -20 23
COOLING
YESTERDAY 2 3 -1 2
MONTH TO DATE 54 64 -10 59
SINCE JUN 1 212 189 23 220
SINCE JAN 1 222 199 23 223
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WIND (MPH)
RESULTANT WIND SPEED 3 RESULTANT WIND DIRECTION NW (300)
HIGHEST WIND SPEED 10 HIGHEST WIND DIRECTION NW (330)
HIGHEST GUST SPEED 16 HIGHEST GUST DIRECTION N (20)
AVERAGE WIND SPEED 4.1
SKY COVER
AVERAGE SKY COVER 0.3
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
FOG
HAZE
RELATIVE HUMIDITY (PERCENT)
HIGHEST 100 400 AM
LOWEST 47 400 PM
AVERAGE 74
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THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 78 88 1991
MINIMUM TEMPERATURE (F) 57 47 1951
SUNRISE AND SUNSET
AUGUST 18 2026........SUNRISE 610 AM PDT SUNSET 815 PM PDT
AUGUST 19 2026........SUNRISE 611 AM PDT SUNSET 814 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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