NWS CLI archive · settlement source
CLISEA · 시애틀 · America/Los_Angeles · ← 2026-09-17 · 2026-09-19 → · All dates for KSEA · JSON · METAR-derived record
Final issued 2026-09-19 04:28:00 EDT · Product id iem:CDUS46-KSEW-190828:SEA:2026-09-18:final · IEM archive
Product id iem:CDUS46-KSEW-190828:SEA:2026-09-18:final · iem-afos · IEM archive
SHA-256 cdb561b9ec8011a6e7117b96a66601ef70180d6412f35f744f359c5a6fd37352
Product text
CDUS46 KSEW 190828
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
128 AM PDT SAT SEP 19 2026
...................................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 18 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 69 326 PM 85 1991 71 -2 72
MINIMUM 55 1159 PM 38 1947 53 2 53
AVERAGE 62 62 0 63
PRECIPITATION (IN)
YESTERDAY 0.00 0.81 2021 0.05 -0.05 0.00
MONTH TO DATE 1.03 0.85 0.18 0.06
SINCE OCT 1 37.94 38.58 -0.64 28.97
SINCE JAN 1 21.16 22.64 -1.48 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 3 4 -1 2
MONTH TO DATE 49 43 6 13
SINCE SEP 1 49 43 6 13
SINCE JUL 1 74 98 -24 37
COOLING
YESTERDAY 0 1 -1 0
MONTH TO DATE 2 27 -25 34
SINCE SEP 1 2 27 -25 34
SINCE JAN 1 267 260 7 328
...................................................................
WIND (MPH)
RESULTANT WIND SPEED 6 RESULTANT WIND DIRECTION S (200)
HIGHEST WIND SPEED 12 HIGHEST WIND DIRECTION S (190)
HIGHEST GUST SPEED 16 HIGHEST GUST DIRECTION S (200)
AVERAGE WIND SPEED 6.7
SKY COVER
AVERAGE SKY COVER 0.5
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
HAZE
RELATIVE HUMIDITY (PERCENT)
HIGHEST 97 400 AM
LOWEST 57 400 PM
AVERAGE 77
..........................................................
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 71 82 1999
MINIMUM TEMPERATURE (F) 53 40 1947
1957
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.
$$Product id iem:CDUS46-KSEW-190118:SEA:2026-09-18:interim · iem-afos · IEM archive
SHA-256 911a5f795380d32736fd3bd79d09e6464bfb101a94c822b7db46369e4868fc3e
Product text
CDUS46 KSEW 190118
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
618 PM PDT FRI SEP 18 2026
...................................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 18 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 69 326 PM 85 1991 71 -2 72
MINIMUM 55 315 AM 38 1947 53 2 53
AVERAGE 62 62 0 63
PRECIPITATION (IN)
TODAY 0.00 0.81 2021 0.05 -0.05 0.00
MONTH TO DATE 1.03 0.85 0.18 0.06
SINCE OCT 1 37.94 38.58 -0.64 28.97
SINCE JAN 1 21.16 22.64 -1.48 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 3 4 -1 2
MONTH TO DATE 49 43 6 13
SINCE SEP 1 49 43 6 13
SINCE JUL 1 74 98 -24 37
COOLING
TODAY 0 1 -1 0
MONTH TO DATE 2 27 -25 34
SINCE SEP 1 2 27 -25 34
SINCE JAN 1 267 260 7 328
...................................................................
WIND (MPH)
RESULTANT WIND SPEED 7 RESULTANT WIND DIRECTION S (200)
HIGHEST WIND SPEED 12 HIGHEST WIND DIRECTION S (190)
HIGHEST GUST SPEED 16 HIGHEST GUST DIRECTION S (200)
AVERAGE WIND SPEED 7.0
SKY COVER
AVERAGE SKY COVER 0.6
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
HAZE
RELATIVE HUMIDITY (PERCENT)
HIGHEST 97 400 AM
LOWEST 57 400 PM
AVERAGE 77
..........................................................
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 71 82 1999
MINIMUM TEMPERATURE (F) 53 40 1947
1957
SUNRISE AND SUNSET
SEPTEMBER 18 2026.....SUNRISE 651 AM PDT SUNSET 715 PM PDT
SEPTEMBER 19 2026.....SUNRISE 652 AM PDT SUNSET 713 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/2026-09-18 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.