NWS CLI archive · settlement source
CLISEA · 시애틀 · America/Los_Angeles · ← 2026-09-18 · 2026-09-20 → · All dates for KSEA · JSON · METAR-derived record
Final issued 2026-09-20 04:26:00 EDT · Product id iem:CDUS46-KSEW-200826:SEA:2026-09-19:final · IEM archive
Product id iem:CDUS46-KSEW-200826:SEA:2026-09-19:final · iem-afos · IEM archive
SHA-256 a5d5cc2dac93f128c904e0449877737c290b9a5b98e80832cfb3798db1546f41
Product text
CDUS46 KSEW 200826
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
126 AM PDT SUN SEP 20 2026
...................................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 19 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 63 529 PM 82 1999 71 -8 76
MINIMUM 52 435 AM 40 1947 53 -1 51
1957
AVERAGE 58 62 -4 64
PRECIPITATION (IN)
YESTERDAY 0.00 0.79 1959 0.06 -0.06 0.00
MONTH TO DATE 1.03 0.91 0.12 0.06
SINCE OCT 1 37.94 38.64 -0.70 28.97
SINCE JAN 1 21.16 22.70 -1.54 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 7 4 3 1
MONTH TO DATE 56 47 9 14
SINCE SEP 1 56 47 9 14
SINCE JUL 1 81 102 -21 38
COOLING
YESTERDAY 0 1 -1 0
MONTH TO DATE 2 28 -26 34
SINCE SEP 1 2 28 -26 34
SINCE JAN 1 267 261 6 328
...................................................................
WIND (MPH)
RESULTANT WIND SPEED 2 RESULTANT WIND DIRECTION SW (220)
HIGHEST WIND SPEED 7 HIGHEST WIND DIRECTION N (340)
HIGHEST GUST SPEED 10 HIGHEST GUST DIRECTION W (260)
AVERAGE WIND SPEED 3.2
SKY COVER
AVERAGE SKY COVER 0.6
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 97 1000 AM
LOWEST 72 400 PM
AVERAGE 85
..........................................................
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 71 88 1974
MINIMUM TEMPERATURE (F) 53 40 1949
SUNRISE AND SUNSET
SEPTEMBER 20 2026.....SUNRISE 654 AM PDT SUNSET 711 PM PDT
SEPTEMBER 21 2026.....SUNRISE 655 AM PDT SUNSET 709 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-200116:SEA:2026-09-19:interim · iem-afos · IEM archive
SHA-256 fd2ab7df08ed0e280d68ed11769c259e0a4723341e992fcf3e379c58c5f48e50
Product text
CDUS46 KSEW 200116
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
616 PM PDT SAT SEP 19 2026
...................................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 19 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 63 459 PM 82 1999 71 -8 76
MINIMUM 52 435 AM 40 1947 53 -1 51
1957
AVERAGE 58 62 -4 64
PRECIPITATION (IN)
TODAY 0.00 0.79 1959 0.06 -0.06 0.00
MONTH TO DATE 1.03 0.91 0.12 0.06
SINCE OCT 1 37.94 38.64 -0.70 28.97
SINCE JAN 1 21.16 22.70 -1.54 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 7 4 3 1
MONTH TO DATE 56 47 9 14
SINCE SEP 1 56 47 9 14
SINCE JUL 1 81 102 -21 38
COOLING
TODAY 0 1 -1 0
MONTH TO DATE 2 28 -26 34
SINCE SEP 1 2 28 -26 34
SINCE JAN 1 267 261 6 328
...................................................................
WIND (MPH)
RESULTANT WIND SPEED 2 RESULTANT WIND DIRECTION SW (210)
HIGHEST WIND SPEED 7 HIGHEST WIND DIRECTION NW (300)
HIGHEST GUST SPEED 10 HIGHEST GUST DIRECTION W (260)
AVERAGE WIND SPEED 3.3
SKY COVER
AVERAGE SKY COVER 0.7
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 97 1000 AM
LOWEST 72 400 PM
AVERAGE 85
..........................................................
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 71 88 1974
MINIMUM TEMPERATURE (F) 53 40 1949
SUNRISE AND SUNSET
SEPTEMBER 19 2026.....SUNRISE 652 AM PDT SUNSET 713 PM PDT
SEPTEMBER 20 2026.....SUNRISE 654 AM PDT SUNSET 711 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/2026-09-19 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.