NWS CLI archive · settlement source
KSEA · 2026-08-31 - NWS CLI
CLISEA · 시애틀 · America/Los_Angeles · ← 2026-08-30 · 2026-09-01 → · All dates for KSEA · JSON · METAR-derived record
Settlement value - latest final issue
finalHigh
76°F (24.44°C)
Low
54°F (12.22°C)
Precip
0 in (0 mm)
Final issued 2026-09-01 04:27:00 EDT · Product id iem:CDUS46-KSEW-010827:SEA:2026-08-31:final · IEM archive
Every issue for this date, as received
final2026-09-01 04:27:00 EDT · KSEW · CDUS46 KSEW 010827 · 76°F / 54°F / 0 in
Product id iem:CDUS46-KSEW-010827:SEA:2026-08-31:final · iem-afos · IEM archive
SHA-256 11fbbf1db968723bb637eac1068f59763be8e1a66a48ffc7f6f51d1a6be7981a
Product text
CDUS46 KSEW 010827
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
127 AM PDT TUE SEP 01 2026
...................................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR AUGUST 31 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 76 427 PM 92 1987 76 0 76
MINIMUM 54 541 AM 46 1950 56 -2 56
AVERAGE 65 66 -1 66
PRECIPITATION (IN)
YESTERDAY 0.00 0.56 1961 0.04 -0.04 0.00
MONTH TO DATE 0.56 0.97 -0.41 1.14
SINCE OCT 1 36.91 37.73 -0.82 28.91
SINCE JAN 1 20.13 21.79 -1.66 15.51
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 0 1 -1 0
MONTH TO DATE 5 24 -19 3
SINCE JUN 1 120 173 -53 118
SINCE JUL 1 25 55 -30 24
COOLING
YESTERDAY 0 2 -2 1
MONTH TO DATE 97 98 -1 130
SINCE JUN 1 255 223 32 291
SINCE JAN 1 265 233 32 294
...................................................................
WIND (MPH)
RESULTANT WIND SPEED 8 RESULTANT WIND DIRECTION N (360)
HIGHEST WIND SPEED 13 HIGHEST WIND DIRECTION N (360)
HIGHEST GUST SPEED 23 HIGHEST GUST DIRECTION N (350)
AVERAGE WIND SPEED 8.6
SKY COVER
AVERAGE SKY COVER 0.6
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 90 400 AM
LOWEST 40 300 PM
AVERAGE 65
..........................................................
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 75 91 1987
MINIMUM TEMPERATURE (F) 56 46 1973
SUNRISE AND SUNSET
SEPTEMBER 1 2026.....SUNRISE 628 AM PDT SUNSET 749 PM PDT
SEPTEMBER 2 2026.....SUNRISE 630 AM PDT SUNSET 747 PM PDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
$$interim 0500 PM2026-08-31 21:16:00 EDT · KSEW · CDUS46 KSEW 010116 · 76°F / 54°F / 0 in
Product id iem:CDUS46-KSEW-010116:SEA:2026-08-31:interim · iem-afos · IEM archive
SHA-256 ca60f443c76eebc4f652bb83bbdc99aed1edc6db179ca657305fd5cd0376debf
Product text
CDUS46 KSEW 010116
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
616 PM PDT MON AUG 31 2026
...................................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR AUGUST 31 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 76 427 PM 92 1987 76 0 76
MINIMUM 54 541 AM 46 1950 56 -2 56
AVERAGE 65 66 -1 66
PRECIPITATION (IN)
TODAY 0.00 0.56 1961 0.04 -0.04 0.00
MONTH TO DATE 0.56 0.97 -0.41 1.14
SINCE OCT 1 36.91 37.73 -0.82 28.91
SINCE JAN 1 20.13 21.79 -1.66 15.51
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 0 1 -1 0
MONTH TO DATE 5 24 -19 3
SINCE JUN 1 120 173 -53 118
SINCE JUL 1 25 55 -30 24
COOLING
TODAY 0 2 -2 1
MONTH TO DATE 97 98 -1 130
SINCE JUN 1 255 223 32 291
SINCE JAN 1 265 233 32 294
...................................................................
WIND (MPH)
RESULTANT WIND SPEED 8 RESULTANT WIND DIRECTION N (0)
HIGHEST WIND SPEED 13 HIGHEST WIND DIRECTION N (360)
HIGHEST GUST SPEED 23 HIGHEST GUST DIRECTION N (350)
AVERAGE WIND SPEED 8.8
SKY COVER
AVERAGE SKY COVER 0.6
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 90 400 AM
LOWEST 40 300 PM
AVERAGE 65
..........................................................
THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 75 91 1987
MINIMUM TEMPERATURE (F) 56 46 1973
SUNRISE AND SUNSET
AUGUST 31 2026........SUNRISE 627 AM PDT SUNSET 751 PM PDT
SEPTEMBER 1 2026.....SUNRISE 628 AM PDT SUNSET 749 PM PDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
$$How to cite this page in market rules
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/2026-08-31 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.