NWS CLI archive · settlement source
CLISEA · 시애틀 · America/Los_Angeles · ← 2026-09-20 · 2026-09-22 → · All dates for KSEA · JSON · METAR-derived record
Final issued 2026-09-22 04:26:00 EDT · Product id iem:CDUS46-KSEW-220826:SEA:2026-09-21:final · IEM archive
Product id iem:CDUS46-KSEW-220826:SEA:2026-09-21:final · iem-afos · IEM archive
SHA-256 14393ac714b82871f07aee4ef23b977b8fabe3d45d35c786a8ac0978a47ea436
Product text
CDUS46 KSEW 220826
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
126 AM PDT TUE SEP 22 2026
...................................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 21 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 67 251 PM 88 1952 70 -3 69
1974
MINIMUM 52 623 AM 39 1955 53 -1 57
1960
AVERAGE 60 61 -1 63
PRECIPITATION (IN)
YESTERDAY 0.00 0.94 1981 0.06 -0.06 0.43
MONTH TO DATE 1.03 1.02 0.01 0.49
SINCE OCT 1 37.94 38.75 -0.81 29.40
SINCE JAN 1 21.16 22.81 -1.65 16.00
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 4 1 2
MONTH TO DATE 66 55 11 18
SINCE SEP 1 66 55 11 18
SINCE JUL 1 91 110 -19 42
COOLING
YESTERDAY 0 1 -1 0
MONTH TO DATE 2 30 -28 34
SINCE SEP 1 2 30 -28 34
SINCE JAN 1 267 263 4 328
...................................................................
WIND (MPH)
RESULTANT WIND SPEED 1 RESULTANT WIND DIRECTION SW (230)
HIGHEST WIND SPEED 10 HIGHEST WIND DIRECTION S (200)
HIGHEST GUST SPEED 15 HIGHEST GUST DIRECTION SE (150)
AVERAGE WIND SPEED 4.2
SKY COVER
AVERAGE SKY COVER 0.4
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 93 100 AM
LOWEST 63 500 PM
AVERAGE 78
..........................................................
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 70 92 1990
MINIMUM TEMPERATURE (F) 53 37 1955
SUNRISE AND SUNSET
SEPTEMBER 22 2026.....SUNRISE 656 AM PDT SUNSET 706 PM PDT
SEPTEMBER 23 2026.....SUNRISE 658 AM PDT SUNSET 704 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-220117:SEA:2026-09-21:interim · iem-afos · IEM archive
SHA-256 009f798b2f27342ede419d0a9c7b9c3a3baa3e2cbbdfb93a41aba3d8bba80b90
Product text
CDUS46 KSEW 220117
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
617 PM PDT MON SEP 21 2026
...................................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 21 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 67 251 PM 88 1952 70 -3 69
1974
MINIMUM 52 623 AM 39 1955 53 -1 57
1960
AVERAGE 60 61 -1 63
PRECIPITATION (IN)
TODAY 0.00 0.94 1981 0.06 -0.06 0.43
MONTH TO DATE 1.03 1.02 0.01 0.49
SINCE OCT 1 37.94 38.75 -0.81 29.40
SINCE JAN 1 21.16 22.81 -1.65 16.00
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 4 1 2
MONTH TO DATE 66 55 11 18
SINCE SEP 1 66 55 11 18
SINCE JUL 1 91 110 -19 42
COOLING
TODAY 0 1 -1 0
MONTH TO DATE 2 30 -28 34
SINCE SEP 1 2 30 -28 34
SINCE JAN 1 267 263 4 328
...................................................................
WIND (MPH)
RESULTANT WIND SPEED 1 RESULTANT WIND DIRECTION W (270)
HIGHEST WIND SPEED 10 HIGHEST WIND DIRECTION S (200)
HIGHEST GUST SPEED 15 HIGHEST GUST DIRECTION SE (150)
AVERAGE WIND SPEED 4.9
SKY COVER
AVERAGE SKY COVER 0.4
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 93 100 AM
LOWEST 63 400 PM
AVERAGE 78
..........................................................
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 70 92 1990
MINIMUM TEMPERATURE (F) 53 37 1955
SUNRISE AND SUNSET
SEPTEMBER 21 2026.....SUNRISE 655 AM PDT SUNSET 709 PM PDT
SEPTEMBER 22 2026.....SUNRISE 656 AM PDT SUNSET 706 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/2026-09-21 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.