NWS CLI archive · settlement source
CLISEA · 시애틀 · America/Los_Angeles · ← 2026-10-16 · 2026-10-18 → · All dates for KSEA · JSON · METAR-derived record
Final issued 2026-10-18 04:26:00 EDT · Product id iem:CDUS46-KSEW-180826:SEA:2026-10-17:final · IEM archive
Product id iem:CDUS46-KSEW-180826:SEA:2026-10-17:final · iem-afos · IEM archive
SHA-256 f15b2062f30ce2a05ff1e5cb737fe99dda0364eb2111ec0b7de6195571322f7b
Product text
CDUS46 KSEW 180826
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
126 AM PDT SUN OCT 18 2026
...................................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR OCTOBER 17 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 62 249 PM 74 1989 60 2 60
MINIMUM 49 1147 PM 34 1949 47 2 49
AVERAGE 56 53 3 55
PRECIPITATION (IN)
YESTERDAY 0.02 1.24 2009 0.13 -0.11 T
MONTH TO DATE 0.08 1.75 -1.67 0.60
SINCE OCT 1 0.08 1.75 -1.67 0.60
SINCE JAN 1 21.67 25.15 -3.48 16.87
SNOWFALL (IN)
YESTERDAY 0.0 MM MM 0.0
MONTH TO DATE 0.0 0.0
SINCE OCT 1 0.0 0.0
SINCE JUL 1 0.0 0.0
SNOW DEPTH 0
DEGREE DAYS
HEATING
YESTERDAY 9 12 -3 10
MONTH TO DATE 125 157 -32 160
SINCE SEP 1 258 259 -1 211
SINCE JUL 1 283 314 -31 235
COOLING
YESTERDAY 0 0 0 0
MONTH TO DATE 0 0 0 0
SINCE SEP 1 2 30 -28 34
SINCE JAN 1 267 263 4 328
...................................................................
WIND (MPH)
RESULTANT WIND SPEED 3 RESULTANT WIND DIRECTION E (90)
HIGHEST WIND SPEED 18 HIGHEST WIND DIRECTION NE (30)
HIGHEST GUST SPEED 28 HIGHEST GUST DIRECTION S (200)
AVERAGE WIND SPEED 11.2
SKY COVER
AVERAGE SKY COVER 0.8
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
LIGHT RAIN
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 93 200 AM
LOWEST 56 200 PM
AVERAGE 75
..........................................................
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 60 71 2023
MINIMUM TEMPERATURE (F) 47 32 1949
SUNRISE AND SUNSET
OCTOBER 18 2026.......SUNRISE 732 AM PDT SUNSET 615 PM PDT
OCTOBER 19 2026.......SUNRISE 734 AM PDT SUNSET 614 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-180119:SEA:2026-10-17:interim · iem-afos · IEM archive
SHA-256 502f52845639e524d8b5fec3b95f5ec1a5da3721a6f3cd2e21ccc7a05f947c35
Product text
CDUS46 KSEW 180119
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
619 PM PDT SAT OCT 17 2026
...................................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR OCTOBER 17 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 62 249 PM 74 1989 60 2 60
MINIMUM 54 1015 AM 34 1949 47 7 49
AVERAGE 58 53 5 55
PRECIPITATION (IN)
TODAY 0.02 1.24 2009 0.13 -0.11 T
MONTH TO DATE 0.08 1.75 -1.67 0.60
SINCE OCT 1 0.08 1.75 -1.67 0.60
SINCE JAN 1 21.67 25.15 -3.48 16.87
SNOWFALL (IN)
TODAY MM MM MM 0.0
MONTH TO DATE 0.0 0.0
SINCE OCT 1 0.0 0.0
SINCE JUL 1 0.0 0.0
SNOW DEPTH MM
DEGREE DAYS
HEATING
TODAY 7 12 -5 10
MONTH TO DATE 123 157 -34 160
SINCE SEP 1 256 259 -3 211
SINCE JUL 1 281 314 -33 235
COOLING
TODAY 0 0 0 0
MONTH TO DATE 0 0 0 0
SINCE SEP 1 2 30 -28 34
SINCE JAN 1 267 263 4 328
...................................................................
WIND (MPH)
RESULTANT WIND SPEED 4 RESULTANT WIND DIRECTION S (160)
HIGHEST WIND SPEED 18 HIGHEST WIND DIRECTION S (200)
HIGHEST GUST SPEED 28 HIGHEST GUST DIRECTION S (200)
AVERAGE WIND SPEED 10.6
SKY COVER
AVERAGE SKY COVER 0.9
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
LIGHT RAIN
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 93 200 AM
LOWEST 56 200 PM
AVERAGE 75
..........................................................
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 60 71 2023
MINIMUM TEMPERATURE (F) 47 32 1949
SUNRISE AND SUNSET
OCTOBER 17 2026.......SUNRISE 731 AM PDT SUNSET 617 PM PDT
OCTOBER 18 2026.......SUNRISE 732 AM PDT SUNSET 615 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/2026-10-17 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.