NWS CLI archive · settlement source
CLISEA · 시애틀 · America/Los_Angeles · ← 2026-09-08 · 2026-09-10 → · All dates for KSEA · JSON · METAR-derived record
Final issued 2026-09-10 04:26:00 EDT · Product id iem:CDUS46-KSEW-100826:SEA:2026-09-09:final · IEM archive
Product id iem:CDUS46-KSEW-100826:SEA:2026-09-09:final · iem-afos · IEM archive
SHA-256 0e852141b90efcdb763e1be5fca7df9c778b111a353d0631dc70fdb4095d4f7c
Product text
CDUS46 KSEW 100826
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
126 AM PDT THU SEP 10 2026
...................................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 9 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 78 520 PM 89 1963 74 4 70
MINIMUM 54 509 AM 40 1952 55 -1 58
AVERAGE 66 64 2 64
PRECIPITATION (IN)
YESTERDAY 0.00 0.61 1982 0.04 -0.04 0.00
MONTH TO DATE 0.35 0.39 -0.04 0.05
SINCE OCT 1 37.26 38.12 -0.86 28.96
SINCE JAN 1 20.48 22.18 -1.70 15.56
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 2 -2 1
MONTH TO DATE 18 18 0 2
SINCE SEP 1 18 18 0 2
SINCE JUL 1 43 73 -30 26
COOLING
YESTERDAY 1 2 -1 0
MONTH TO DATE 1 18 -17 21
SINCE SEP 1 1 18 -17 21
SINCE JAN 1 266 251 15 315
...................................................................
WIND (MPH)
RESULTANT WIND SPEED 4 RESULTANT WIND DIRECTION N (340)
HIGHEST WIND SPEED 13 HIGHEST WIND DIRECTION N (10)
HIGHEST GUST SPEED 15 HIGHEST GUST DIRECTION N (20)
AVERAGE WIND SPEED 6.2
SKY COVER
AVERAGE SKY COVER 0.6
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 93 600 AM
LOWEST 37 600 PM
AVERAGE 65
..........................................................
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 74 92 2022
MINIMUM TEMPERATURE (F) 55 39 1952
SUNRISE AND SUNSET
SEPTEMBER 10 2026.....SUNRISE 640 AM PDT SUNSET 731 PM PDT
SEPTEMBER 11 2026.....SUNRISE 642 AM PDT SUNSET 729 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-100116:SEA:2026-09-09:interim · iem-afos · IEM archive
SHA-256 1cebd1e065d6d3fb8f282fc41b6db3d02336f2812e24155c0bf0bb70fb423d6b
Product text
CDUS46 KSEW 100116
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
616 PM PDT WED SEP 09 2026
...................................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 9 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 78 442 PM 89 1963 74 4 70
MINIMUM 54 509 AM 40 1952 55 -1 58
AVERAGE 66 64 2 64
PRECIPITATION (IN)
TODAY 0.00 0.61 1982 0.04 -0.04 0.00
MONTH TO DATE 0.35 0.39 -0.04 0.05
SINCE OCT 1 37.26 38.12 -0.86 28.96
SINCE JAN 1 20.48 22.18 -1.70 15.56
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 0 2 -2 1
MONTH TO DATE 18 18 0 2
SINCE SEP 1 18 18 0 2
SINCE JUL 1 43 73 -30 26
COOLING
TODAY 1 2 -1 0
MONTH TO DATE 1 18 -17 21
SINCE SEP 1 1 18 -17 21
SINCE JAN 1 266 251 15 315
...................................................................
WIND (MPH)
RESULTANT WIND SPEED 4 RESULTANT WIND DIRECTION N (340)
HIGHEST WIND SPEED 13 HIGHEST WIND DIRECTION N (10)
HIGHEST GUST SPEED 15 HIGHEST GUST DIRECTION N (20)
AVERAGE WIND SPEED 6.4
SKY COVER
AVERAGE SKY COVER 0.5
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 93 600 AM
LOWEST 43 400 PM
AVERAGE 68
..........................................................
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 74 92 2022
MINIMUM TEMPERATURE (F) 55 39 1952
SUNRISE AND SUNSET
SEPTEMBER 9 2026.....SUNRISE 639 AM PDT SUNSET 733 PM PDT
SEPTEMBER 10 2026.....SUNRISE 640 AM PDT SUNSET 731 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/2026-09-09 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.