NWS CLI archive · settlement source
CLISEA · 시애틀 · America/Los_Angeles · ← 2026-09-03 · 2026-09-05 → · All dates for KSEA · JSON · METAR-derived record
Final issued 2026-09-05 04:27:00 EDT · Product id iem:CDUS46-KSEW-050827:SEA:2026-09-04:final · IEM archive
Product id iem:CDUS46-KSEW-050827:SEA:2026-09-04:final · iem-afos · IEM archive
SHA-256 896521b2b78fb80fbab5812eefeeddd8abec505e8ae5ca6be42fd72394b3f7ed
Product text
CDUS46 KSEW 050827
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
127 AM PDT SAT SEP 05 2026
...................................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 4 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 70 340 PM 88 2017 75 -5 79
MINIMUM 53 530 AM 42 1952 56 -3 58
AVERAGE 62 65 -3 69
PRECIPITATION (IN)
YESTERDAY 0.01 0.97 1945 0.05 -0.04 0.00
MONTH TO DATE 0.36 0.17 0.19 0.00
SINCE OCT 1 37.27 37.90 -0.63 28.91
SINCE JAN 1 20.49 21.96 -1.47 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 3 2 1 0
MONTH TO DATE 12 8 4 0
SINCE SEP 1 12 8 4 0
SINCE JUL 1 37 63 -26 24
COOLING
YESTERDAY 0 2 -2 4
MONTH TO DATE 0 8 -8 15
SINCE SEP 1 0 8 -8 15
SINCE JAN 1 265 241 24 309
...................................................................
WIND (MPH)
RESULTANT WIND SPEED 1 RESULTANT WIND DIRECTION E (110)
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION S (160)
HIGHEST GUST SPEED 18 HIGHEST GUST DIRECTION S (160)
AVERAGE WIND SPEED 3.5
SKY COVER
AVERAGE SKY COVER 0.7
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
LIGHT RAIN
RELATIVE HUMIDITY (PERCENT)
HIGHEST 96 400 AM
LOWEST 54 600 PM
AVERAGE 75
..........................................................
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 75 90 2024
MINIMUM TEMPERATURE (F) 55 42 1947
SUNRISE AND SUNSET
SEPTEMBER 5 2026.....SUNRISE 634 AM PDT SUNSET 741 PM PDT
SEPTEMBER 6 2026.....SUNRISE 635 AM PDT SUNSET 739 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-050157:SEA:2026-09-04:interim · iem-afos · IEM archive
SHA-256 fa1ebb849a7e9a98b843840b6583d347c951cb794e657c2d41dc3397588a16e8
Product text
CDUS46 KSEW 050157
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
657 PM PDT FRI SEP 04 2026
...................................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 4 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 70 340 PM 88 2017 75 -5 79
MINIMUM 53 530 AM 42 1952 56 -3 58
AVERAGE 62 65 -3 69
PRECIPITATION (IN)
TODAY T 0.97 1945 0.05 -0.05 0.00
MONTH TO DATE 0.35 0.17 0.18 0.00
SINCE OCT 1 37.26 37.90 -0.64 28.91
SINCE JAN 1 20.48 21.96 -1.48 15.51
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 3 2 1 0
MONTH TO DATE 12 8 4 0
SINCE SEP 1 12 8 4 0
SINCE JUL 1 37 63 -26 24
COOLING
TODAY 0 2 -2 4
MONTH TO DATE 0 8 -8 15
SINCE SEP 1 0 8 -8 15
SINCE JAN 1 265 241 24 309
...................................................................
WIND (MPH)
RESULTANT WIND SPEED 1 RESULTANT WIND DIRECTION W (280)
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION S (160)
HIGHEST GUST SPEED 18 HIGHEST GUST DIRECTION S (160)
AVERAGE WIND SPEED 2.5
SKY COVER
AVERAGE SKY COVER 0.7
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 96 400 AM
LOWEST 57 100 PM
AVERAGE 77
..........................................................
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 75 90 2024
MINIMUM TEMPERATURE (F) 55 42 1947
SUNRISE AND SUNSET
SEPTEMBER 4 2026.....SUNRISE 632 AM PDT SUNSET 743 PM PDT
SEPTEMBER 5 2026.....SUNRISE 634 AM PDT SUNSET 741 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/2026-09-04 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.