NWS CLI archive · settlement source
CLISEA · 시애틀 · America/Los_Angeles · ← 2026-09-11 · 2026-09-13 → · All dates for KSEA · JSON · METAR-derived record
Final issued 2026-09-13 04:27:00 EDT · Product id iem:CDUS46-KSEW-130827:SEA:2026-09-12:final · IEM archive
Product id iem:CDUS46-KSEW-130827:SEA:2026-09-12:final · iem-afos · IEM archive
SHA-256 ec6ec46fff9e820cd1e158b7f4e579d01b4ebebf154eabe5d96aa63996ff3f92
Product text
CDUS46 KSEW 130827
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
127 AM PDT SUN SEP 13 2026
...................................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 12 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 66 416 PM 85 1961 73 -7 72
1975
MINIMUM 53 614 AM 44 1949 54 -1 58
1962
AVERAGE 60 64 -4 65
PRECIPITATION (IN)
YESTERDAY 0.12 0.60 2004 0.05 0.07 0.00
MONTH TO DATE 0.47 0.54 -0.07 0.06
SINCE OCT 1 37.38 38.27 -0.89 28.97
SINCE JAN 1 20.60 22.33 -1.73 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 5 2 3 0
MONTH TO DATE 29 24 5 5
SINCE SEP 1 29 24 5 5
SINCE JUL 1 54 79 -25 29
COOLING
YESTERDAY 0 1 -1 0
MONTH TO DATE 1 21 -20 21
SINCE SEP 1 1 21 -20 21
SINCE JAN 1 266 254 12 315
...................................................................
WIND (MPH)
RESULTANT WIND SPEED 3 RESULTANT WIND DIRECTION W (270)
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION SW (210)
HIGHEST GUST SPEED 19 HIGHEST GUST DIRECTION SW (220)
AVERAGE WIND SPEED 4.6
SKY COVER
AVERAGE SKY COVER 0.9
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
RAIN
LIGHT RAIN
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 97 1000 PM
LOWEST 54 400 PM
AVERAGE 76
..........................................................
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 73 87 1999
MINIMUM TEMPERATURE (F) 54 39 1952
SUNRISE AND SUNSET
SEPTEMBER 13 2026.....SUNRISE 644 AM PDT SUNSET 725 PM PDT
SEPTEMBER 14 2026.....SUNRISE 646 AM PDT SUNSET 723 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-130117:SEA:2026-09-12:interim · iem-afos · IEM archive
SHA-256 80dd90f9715c35cbbe240dbaa971e6024b8c5b9ea4ee90d31797f956a93bfbc0
Product text
CDUS46 KSEW 130117
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
617 PM PDT SAT SEP 12 2026
...................................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 12 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 66 416 PM 85 1961 73 -7 72
1975
MINIMUM 53 614 AM 44 1949 54 -1 58
1962
AVERAGE 60 64 -4 65
PRECIPITATION (IN)
TODAY 0.00 0.60 2004 0.05 -0.05 0.00
MONTH TO DATE 0.35 0.54 -0.19 0.06
SINCE OCT 1 37.26 38.27 -1.01 28.97
SINCE JAN 1 20.48 22.33 -1.85 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 5 2 3 0
MONTH TO DATE 29 24 5 5
SINCE SEP 1 29 24 5 5
SINCE JUL 1 54 79 -25 29
COOLING
TODAY 0 1 -1 0
MONTH TO DATE 1 21 -20 21
SINCE SEP 1 1 21 -20 21
SINCE JAN 1 266 254 12 315
...................................................................
WIND (MPH)
RESULTANT WIND SPEED 3 RESULTANT WIND DIRECTION NW (300)
HIGHEST WIND SPEED 10 HIGHEST WIND DIRECTION NW (300)
HIGHEST GUST SPEED 13 HIGHEST GUST DIRECTION W (290)
AVERAGE WIND SPEED 3.8
SKY COVER
AVERAGE SKY COVER 0.9
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 83 600 AM
LOWEST 54 400 PM
AVERAGE 69
..........................................................
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 73 87 1999
MINIMUM TEMPERATURE (F) 54 39 1952
SUNRISE AND SUNSET
SEPTEMBER 12 2026.....SUNRISE 643 AM PDT SUNSET 727 PM PDT
SEPTEMBER 13 2026.....SUNRISE 644 AM PDT SUNSET 725 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/2026-09-12 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.