NWS CLI archive · settlement source
CLISEA · 시애틀 · America/Los_Angeles · ← 2026-09-09 · 2026-09-11 → · All dates for KSEA · JSON · METAR-derived record
Final issued 2026-09-11 04:27:00 EDT · Product id iem:CDUS46-KSEW-110827:SEA:2026-09-10:final · IEM archive
Product id iem:CDUS46-KSEW-110827:SEA:2026-09-10:final · iem-afos · IEM archive
SHA-256 8b9442e91f2b89dfdce879fd7e593cc54882262d86de50c4ced32d987996b1b8
Product text
CDUS46 KSEW 110827
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
127 AM PDT FRI SEP 11 2026
...................................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 10 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 71 139 PM 92 2022 74 -3 75
MINIMUM 56 1159 PM 39 1952 55 1 55
AVERAGE 64 64 0 65
PRECIPITATION (IN)
YESTERDAY 0.00 0.64 2004 0.05 -0.05 0.00
MONTH TO DATE 0.35 0.44 -0.09 0.05
SINCE OCT 1 37.26 38.17 -0.91 28.96
SINCE JAN 1 20.48 22.23 -1.75 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 1 2 -1 0
MONTH TO DATE 19 20 -1 2
SINCE SEP 1 19 20 -1 2
SINCE JUL 1 44 75 -31 26
COOLING
YESTERDAY 0 1 -1 0
MONTH TO DATE 1 19 -18 21
SINCE SEP 1 1 19 -18 21
SINCE JAN 1 266 252 14 315
...................................................................
WIND (MPH)
RESULTANT WIND SPEED 2 RESULTANT WIND DIRECTION NW (320)
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION NE (40)
HIGHEST GUST SPEED 20 HIGHEST GUST DIRECTION N (20)
AVERAGE WIND SPEED 6.6
SKY COVER
AVERAGE SKY COVER 0.7
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 87 500 AM
LOWEST 55 200 PM
AVERAGE 71
..........................................................
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 73 93 2013
MINIMUM TEMPERATURE (F) 55 40 1952
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.
$$Product id iem:CDUS46-KSEW-110118:SEA:2026-09-10:interim · iem-afos · IEM archive
SHA-256 1d30ddf27e8865b2de6c1f8df61a010b9e7dc5c2c219f568bb7ca9cfeef9980c
Product text
CDUS46 KSEW 110118
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
618 PM PDT THU SEP 10 2026
...................................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 10 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 71 139 PM 92 2022 74 -3 75
MINIMUM 57 552 AM 39 1952 55 2 55
AVERAGE 64 64 0 65
PRECIPITATION (IN)
TODAY 0.00 0.64 2004 0.05 -0.05 0.00
MONTH TO DATE 0.35 0.44 -0.09 0.05
SINCE OCT 1 37.26 38.17 -0.91 28.96
SINCE JAN 1 20.48 22.23 -1.75 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 1 2 -1 0
MONTH TO DATE 19 20 -1 2
SINCE SEP 1 19 20 -1 2
SINCE JUL 1 44 75 -31 26
COOLING
TODAY 0 1 -1 0
MONTH TO DATE 1 19 -18 21
SINCE SEP 1 1 19 -18 21
SINCE JAN 1 266 252 14 315
...................................................................
WIND (MPH)
RESULTANT WIND SPEED 4 RESULTANT WIND DIRECTION N (360)
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION NE (40)
HIGHEST GUST SPEED 20 HIGHEST GUST DIRECTION N (20)
AVERAGE WIND SPEED 6.8
SKY COVER
AVERAGE SKY COVER 0.7
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 87 500 AM
LOWEST 55 200 PM
AVERAGE 71
..........................................................
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 73 93 2013
MINIMUM TEMPERATURE (F) 55 40 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.
$$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/2026-09-10 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.