NWS CLI archive · settlement source
CLISEA · 시애틀 · America/Los_Angeles · ← 2026-09-10 · 2026-09-12 → · All dates for KSEA · JSON · METAR-derived record
Final issued 2026-09-12 04:26:00 EDT · Product id iem:CDUS46-KSEW-120826:SEA:2026-09-11:final · IEM archive
Product id iem:CDUS46-KSEW-120826:SEA:2026-09-11:final · iem-afos · IEM archive
SHA-256 52ea32bc03c91210b0f2184c15c25903b429d9a832ef2c2f7d1c66b42e0c7879
Product text
CDUS46 KSEW 120826
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
126 AM PDT SAT SEP 12 2026
...................................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 11 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 67 240 PM 93 2013 73 -6 67
MINIMUM 52 456 AM 40 1952 55 -3 56
AVERAGE 60 64 -4 62
PRECIPITATION (IN)
YESTERDAY 0.00 0.58 1956 0.05 -0.05 0.01
MONTH TO DATE 0.35 0.49 -0.14 0.06
SINCE OCT 1 37.26 38.22 -0.96 28.97
SINCE JAN 1 20.48 22.28 -1.80 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 5 2 3 3
MONTH TO DATE 24 22 2 5
SINCE SEP 1 24 22 2 5
SINCE JUL 1 49 77 -28 29
COOLING
YESTERDAY 0 1 -1 0
MONTH TO DATE 1 20 -19 21
SINCE SEP 1 1 20 -19 21
SINCE JAN 1 266 253 13 315
...................................................................
WIND (MPH)
RESULTANT WIND SPEED 4 RESULTANT WIND DIRECTION S (190)
HIGHEST WIND SPEED 12 HIGHEST WIND DIRECTION SW (210)
HIGHEST GUST SPEED 17 HIGHEST GUST DIRECTION S (170)
AVERAGE WIND SPEED 6.0
SKY COVER
AVERAGE SKY COVER 0.7
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 86 500 AM
LOWEST 47 300 PM
AVERAGE 67
..........................................................
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 73 85 1961
1975
MINIMUM TEMPERATURE (F) 54 44 1949
1962
SUNRISE AND SUNSET
SEPTEMBER 12 2026.....SUNRISE 643 AM PDT SUNSET 727 PM PDT
SEPTEMBER 13 2026.....SUNRISE 644 AM PDT SUNSET 725 PM PDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
$$Product id iem:CDUS46-KSEW-120116:SEA:2026-09-11:interim · iem-afos · IEM archive
SHA-256 4b1da833aa8a3075f18972bb23e7de469c06ed0e59ce5165efd50aaa4036ab53
Product text
CDUS46 KSEW 120116
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
616 PM PDT FRI SEP 11 2026
...................................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 11 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 67 240 PM 93 2013 73 -6 67
MINIMUM 52 456 AM 40 1952 55 -3 56
AVERAGE 60 64 -4 62
PRECIPITATION (IN)
TODAY 0.00 0.58 1956 0.05 -0.05 0.01
MONTH TO DATE 0.35 0.49 -0.14 0.06
SINCE OCT 1 37.26 38.22 -0.96 28.97
SINCE JAN 1 20.48 22.28 -1.80 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 5 2 3 3
MONTH TO DATE 24 22 2 5
SINCE SEP 1 24 22 2 5
SINCE JUL 1 49 77 -28 29
COOLING
TODAY 0 1 -1 0
MONTH TO DATE 1 20 -19 21
SINCE SEP 1 1 20 -19 21
SINCE JAN 1 266 253 13 315
...................................................................
WIND (MPH)
RESULTANT WIND SPEED 6 RESULTANT WIND DIRECTION S (180)
HIGHEST WIND SPEED 12 HIGHEST WIND DIRECTION SW (210)
HIGHEST GUST SPEED 17 HIGHEST GUST DIRECTION S (170)
AVERAGE WIND SPEED 7.2
SKY COVER
AVERAGE SKY COVER 0.7
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 86 500 AM
LOWEST 47 300 PM
AVERAGE 67
..........................................................
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 73 85 1961
1975
MINIMUM TEMPERATURE (F) 54 44 1949
1962
SUNRISE AND SUNSET
SEPTEMBER 11 2026.....SUNRISE 642 AM PDT SUNSET 729 PM PDT
SEPTEMBER 12 2026.....SUNRISE 643 AM PDT SUNSET 727 PM PDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
$$Settlement source: the final NWS Climatological Report (CLI) for station KSEA for the contract date, as archived verbatim at https://weathermarket.io/nws-cli/KSEA/2026-09-11 with links to the NWS product and the IEM archive. A CORRECTED re-issue published before the settlement time supersedes earlier issues.
The settlement value for a date is the latest final CLI issued for that date; a corrected re-issue supersedes earlier issues. Interim same-day products never settle. This is the same rule that fills values.nwsOfficial in /api/station/{icao}/daily.
Every issue is stored verbatim as received - nothing is edited or re-derived. Products are held from 2026-09-01 (backfilled from the IEM AFOS archive) and ingested live from api.weather.gov since 2026-11-10, polled every 30 minutes. A date with no final CLI 14 hours after local midnight is reported as not_issued rather than filled in.