NWS CLI archive · settlement source
CLISEA · 시애틀 · America/Los_Angeles · ← 2026-09-14 · 2026-09-16 → · All dates for KSEA · JSON · METAR-derived record
Final issued 2026-09-16 04:26:00 EDT · Product id iem:CDUS46-KSEW-160826:SEA:2026-09-15:final · IEM archive
Product id iem:CDUS46-KSEW-160826:SEA:2026-09-15:final · iem-afos · IEM archive
SHA-256 6a69dcf7e4af9b207af8fca54498516c21aa8a33992a43b282cde373b652e5c6
Product text
CDUS46 KSEW 160826
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
126 AM PDT WED SEP 16 2026
...................................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 15 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 68 328 PM 93 1967 72 -4 70
MINIMUM 54 222 AM 42 1952 54 0 52
AVERAGE 61 63 -2 61
PRECIPITATION (IN)
YESTERDAY 0.01 0.69 1959 0.05 -0.04 0.00
MONTH TO DATE 1.03 0.69 0.34 0.06
SINCE OCT 1 37.94 38.42 -0.48 28.97
SINCE JAN 1 21.16 22.48 -1.32 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 4 3 1 4
MONTH TO DATE 45 33 12 11
SINCE SEP 1 45 33 12 11
SINCE JUL 1 70 88 -18 35
COOLING
YESTERDAY 0 1 -1 0
MONTH TO DATE 1 24 -23 22
SINCE SEP 1 1 24 -23 22
SINCE JAN 1 266 257 9 316
...................................................................
WIND (MPH)
RESULTANT WIND SPEED 7 RESULTANT WIND DIRECTION N (10)
HIGHEST WIND SPEED 16 HIGHEST WIND DIRECTION N (360)
HIGHEST GUST SPEED 21 HIGHEST GUST DIRECTION N (360)
AVERAGE WIND SPEED 7.0
SKY COVER
AVERAGE SKY COVER 0.7
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
LIGHT RAIN
RELATIVE HUMIDITY (PERCENT)
HIGHEST 93 600 AM
LOWEST 52 300 PM
AVERAGE 73
..........................................................
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 72 91 1967
2025
MINIMUM TEMPERATURE (F) 54 44 1952
1992
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.
$$Product id iem:CDUS46-KSEW-160117:SEA:2026-09-15:interim · iem-afos · IEM archive
SHA-256 7257a39bee32f4af0dfcdcd9d381bba8972b39d375e7ec0fac3f32f02523cb00
Product text
CDUS46 KSEW 160117
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
617 PM PDT TUE SEP 15 2026
...................................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 15 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 68 328 PM 93 1967 72 -4 70
MINIMUM 54 222 AM 42 1952 54 0 52
AVERAGE 61 63 -2 61
PRECIPITATION (IN)
TODAY 0.01 0.69 1959 0.05 -0.04 0.00
MONTH TO DATE 1.03 0.69 0.34 0.06
SINCE OCT 1 37.94 38.42 -0.48 28.97
SINCE JAN 1 21.16 22.48 -1.32 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 4 3 1 4
MONTH TO DATE 45 33 12 11
SINCE SEP 1 45 33 12 11
SINCE JUL 1 70 88 -18 35
COOLING
TODAY 0 1 -1 0
MONTH TO DATE 1 24 -23 22
SINCE SEP 1 1 24 -23 22
SINCE JAN 1 266 257 9 316
...................................................................
WIND (MPH)
RESULTANT WIND SPEED 6 RESULTANT WIND DIRECTION N (10)
HIGHEST WIND SPEED 16 HIGHEST WIND DIRECTION N (360)
HIGHEST GUST SPEED 21 HIGHEST GUST DIRECTION N (360)
AVERAGE WIND SPEED 6.8
SKY COVER
AVERAGE SKY COVER 0.9
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
LIGHT RAIN
RELATIVE HUMIDITY (PERCENT)
HIGHEST 93 600 AM
LOWEST 52 300 PM
AVERAGE 73
..........................................................
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 72 91 1967
2025
MINIMUM TEMPERATURE (F) 54 44 1952
1992
SUNRISE AND SUNSET
SEPTEMBER 15 2026.....SUNRISE 647 AM PDT SUNSET 721 PM PDT
SEPTEMBER 16 2026.....SUNRISE 648 AM PDT SUNSET 719 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/2026-09-15 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.