NWS CLI archive · settlement source
CLISEA · 시애틀 · America/Los_Angeles · ← 2026-09-15 · 2026-09-17 → · All dates for KSEA · JSON · METAR-derived record
Final issued 2026-09-17 04:26:00 EDT · Product id iem:CDUS46-KSEW-170826:SEA:2026-09-16:final · IEM archive
Product id iem:CDUS46-KSEW-170826:SEA:2026-09-16:final · iem-afos · IEM archive
SHA-256 aebeb48f92fab3af773f6e1a9ccc5f384522b4dbf65986029987896ce50f0191
Product text
CDUS46 KSEW 170826
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
126 AM PDT THU SEP 17 2026
...................................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 16 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 74 430 PM 91 1967 72 2 91
2025
MINIMUM 53 423 AM 44 1952 54 -1 55
1992
AVERAGE 64 63 1 73
PRECIPITATION (IN)
YESTERDAY 0.00 1.10 1947 0.05 -0.05 0.00
MONTH TO DATE 1.03 0.74 0.29 0.06
SINCE OCT 1 37.94 38.47 -0.53 28.97
SINCE JAN 1 21.16 22.53 -1.37 15.57
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 3 -2 0
MONTH TO DATE 46 36 10 11
SINCE SEP 1 46 36 10 11
SINCE JUL 1 71 91 -20 35
COOLING
YESTERDAY 0 1 -1 8
MONTH TO DATE 1 25 -24 30
SINCE SEP 1 1 25 -24 30
SINCE JAN 1 266 258 8 324
...................................................................
WIND (MPH)
RESULTANT WIND SPEED 8 RESULTANT WIND DIRECTION N (0)
HIGHEST WIND SPEED 16 HIGHEST WIND DIRECTION N (360)
HIGHEST GUST SPEED 21 HIGHEST GUST DIRECTION N (10)
AVERAGE WIND SPEED 9.0
SKY COVER
AVERAGE SKY COVER 0.1
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 93 500 AM
LOWEST 45 400 PM
AVERAGE 69
..........................................................
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 72 85 1991
MINIMUM TEMPERATURE (F) 54 41 1947
SUNRISE AND SUNSET
SEPTEMBER 17 2026.....SUNRISE 650 AM PDT SUNSET 717 PM PDT
SEPTEMBER 18 2026.....SUNRISE 651 AM PDT SUNSET 715 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-170117:SEA:2026-09-16:interim · iem-afos · IEM archive
SHA-256 b8fe8ef5df8e027d717503c100964a8379aa5ae2a410ef236b485389a91f6f8a
Product text
CDUS46 KSEW 170117
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
617 PM PDT WED SEP 16 2026
...................................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 16 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 74 430 PM 91 1967 72 2 91
2025
MINIMUM 53 423 AM 44 1952 54 -1 55
1992
AVERAGE 64 63 1 73
PRECIPITATION (IN)
TODAY 0.00 1.10 1947 0.05 -0.05 0.00
MONTH TO DATE 1.03 0.74 0.29 0.06
SINCE OCT 1 37.94 38.47 -0.53 28.97
SINCE JAN 1 21.16 22.53 -1.37 15.57
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 3 -2 0
MONTH TO DATE 46 36 10 11
SINCE SEP 1 46 36 10 11
SINCE JUL 1 71 91 -20 35
COOLING
TODAY 0 1 -1 8
MONTH TO DATE 1 25 -24 30
SINCE SEP 1 1 25 -24 30
SINCE JAN 1 266 258 8 324
...................................................................
WIND (MPH)
RESULTANT WIND SPEED 8 RESULTANT WIND DIRECTION N (0)
HIGHEST WIND SPEED 16 HIGHEST WIND DIRECTION N (360)
HIGHEST GUST SPEED 21 HIGHEST GUST DIRECTION N (10)
AVERAGE WIND SPEED 8.9
SKY COVER
AVERAGE SKY COVER 0.1
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 93 500 AM
LOWEST 45 400 PM
AVERAGE 69
..........................................................
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 72 85 1991
MINIMUM TEMPERATURE (F) 54 41 1947
SUNRISE AND SUNSET
SEPTEMBER 16 2026.....SUNRISE 648 AM PDT SUNSET 719 PM PDT
SEPTEMBER 17 2026.....SUNRISE 650 AM PDT SUNSET 717 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/2026-09-16 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.