Kalshi's Seattle market settles on the daily high at Sea-Tac (KSEA), as the climate report CLISEA and The Weather Company publish it. Series KXHIGHTSEA, listed since Jan 14, 2026.
Updated Oct 30, 5:21 AM PDT: newest final official high is for Thu, Oct 29.
Seattle-Tacoma International Airport
1:00 AM Oct 31 to 1:00 AM Nov 1 PDT
Midnight to midnight PST, local standard time: 1:00 AM to 1:00 AM on Seattle's clock while daylight saving is on.
Today's six brackets, in whole degrees
Since Aug 14, 2026, 9 of 77 days (12%) settled on a tail bracket: 8 below the bottom bracket and 1 above the top one. In the last 30 days: 2 of 30.
| Day | Settled on | Winning bracket | Time of high (LST) | Settled at |
|---|---|---|---|---|
| Thu, Oct 29 | 55° | 54° to 55° | 2:46 PM | Oct 30, 7:10 AM PDT |
| Wed, Oct 28 | 54° | 53° to 54° | 2:56 PM | Oct 29, 7:11 AM PDT |
| Tue, Oct 27 | 57° | 56° to 57° | 2:19 PM | Oct 28, 7:09 AM PDT |
| Mon, Oct 26 | 58° | 57° to 58° | 1:54 PM | Oct 27, 7:11 AM PDT |
| Sun, Oct 25 | 58° | 58° to 59° | 3:56 PM | Oct 26, 7:11 AM PDT |
| Sat, Oct 24 | 55° | 54° to 55° | 3:56 PM | Oct 25, 7:10 AM PDT |
| Fri, Oct 23 | 58° | 57° to 58° | 2:55 PM | Oct 24, 7:10 AM PDT |
| Thu, Oct 22 | 60° | 60° to 61° | 2:45 PM | Oct 23, 7:10 AM PDT |
| Wed, Oct 21 | 64° | 63° to 64° | 3:50 PM | Oct 22, 7:11 AM PDT |
| Tue, Oct 20 | 62° | 61° to 62° | 3:29 PM | Oct 21, 7:11 AM PDT |
| Mon, Oct 19 | 62° | 61° to 62° | 3:57 PM | Oct 20, 7:11 AM PDT |
| Sun, Oct 18 | 60° | 60° to 61° | 2:22 PM | Oct 19, 7:09 AM PDT |
| Sat, Oct 17 | 62° | 62° to 63° | 2:49 PM | Oct 18, 7:11 AM PDT |
| Fri, Oct 16 | 77° | 77° to 78° | 3:27 PM | Oct 17, 7:09 AM PDT |
| Thu, Oct 15 | 68° | 68° to 69° | 3:41 PM | Oct 16, 7:10 AM PDT |
| Wed, Oct 14 | 67° | 66° to 67° | 2:01 PM | Oct 15, 7:10 AM PDT |
| Tue, Oct 13 | 62° | 62° to 63° | 2:36 PM | Oct 14, 7:11 AM PDT |
| Mon, Oct 12 | 61° | 60° to 61° | 4:01 PM | Oct 13, 7:10 AM PDT |
| Sun, Oct 11 | 60° | 60° to 61° | 3:21 PM | Oct 12, 7:09 AM PDT |
| Sat, Oct 10 | 58° | 58° to 59° | 2:45 PM | Oct 11, 7:10 AM PDT |
| Fri, Oct 9 | 58° | 58° or belowbottom tail | 12:41 PM | Oct 10, 7:10 AM PDT |
| Thu, Oct 8 | 67° | 67° or belowbottom tail | 4:17 PM | Oct 9, 7:11 AM PDT |
| Wed, Oct 7 | 67° | 67° to 68° | 3:48 PM | Oct 8, 7:11 AM PDT |
| Tue, Oct 6 | 66° | 66° to 67° | 4:12 PM | Oct 7, 7:12 AM PDT |
| Mon, Oct 5 | 68° | 67° to 68° | 3:03 PM | Oct 6, 7:13 AM PDT |
| Sun, Oct 4 | 69° | 69° to 70° | 3:59 PM | Oct 5, 7:12 AM PDT |
| Sat, Oct 3 | 67° | 66° to 67° | 4:15 PM | Oct 4, 7:12 AM PDT |
| Fri, Oct 2 | 71° | 70° to 71° | 3:15 PM | Oct 3, 7:12 AM PDT |
| Thu, Oct 1 | 68° | 67° to 68° | 3:49 PM | Oct 2, 7:13 AM PDT |
| Wed, Sep 30 | 65° | 65° to 66° | 3:23 PM | Oct 1, 7:12 AM PDT |
Source: Each market's result, settlement value and time: Kalshi's public market data; Time of the high: NWS climate reports for KSEA, via IEM
Over 364 days (Oct 30, 2025 to Oct 29, 2026), the median time of the official high was 3:45 PM local standard time, and half the highs came between 2:38 PM and 4:34 PM. Over the last 60 days the median was 3:29 PM.
Sea-Tac's high came before 1 AM standard time (1 to 2 AM daylight time) on 5 of 364 days (1%): the climate day's warmest minutes were its first.
KSEA report times, standard time. 1 without a time (MM) left out.
Source: NWS climate reports for KSEA, via IEM; IEM table of NWS climate reports
Polymarket's Seattle market settles on the same station, Seattle-Tacoma International Airport (KSEA), but reads it its own way: the highest of the day's hourly readings in whole °F, over the local calendar day, in 2°F ranges.
Kalshi vs Polymarket in Seattle: the stations and the last 30 days side by side
On 181 days from May 1, 2026 to Oct 29, 2026, the NWS's afternoon preliminary report (usually "as of 5 PM" local time) had the same high as the final report on 181 of 181 days (100%). The final report came in higher on 0 and never lower.
Source: Every NWS climate report issued for KSEA (CLISEA), via IEM's text archive
The normal high for Oct 31 is 56°F and the record high is 71°F. The normal falls to 49°F by Nov 30.
365 final highs at KSEA, Oct 30, 2025 to Oct 29, 2026, against the normal and record each report printed.
Source: NWS climate reports for KSEA, via IEM; NOAA NCEI U.S. Climate Normals
Climate-report stations near Sea-Tac, and how their official highs ran against it. None settles the Seattle market.
Other reporting stations within 25 km (METARs only, no climate report): Renton Muni (KRNT, 9 km), Seattle/Boeing Fld (KBFI, 11 km).
Straight-line distances from KSEA; snapshot Oct 21, 2026.
Source: IEM's list of NWS climate-report sites; aviationweather.gov station information
Seattle-Tacoma International Airport (KSEA), the station named by the climate-report code CLISEA in the market's rules.
Midnight to midnight PST, local standard time. During daylight saving that is 1:00 AM Oct 31 to 1:00 AM Nov 1 PDT.
Trading closes at 1:00 AM PDT after the day ends. Over the last 77 settled days the result posted a median of 6.2 hours after close.
51° or below, 52° to 53°, 54° to 55°, 56° to 57°, 58° to 59°, 60° or above, compared with Sea-Tac's published whole-degree high. The two tails are strict.
On 9 of 77 settled days from Aug 14, 2026 to Oct 29, 2026 (12%): 8 on the bottom tail and 1 on the top tail.
Over 364 days to Oct 29, 2026, the median time of the official high at KSEA was 3:45 PM local standard time. On 5 of those days it came before 1 AM standard time.
From May 1, 2026 to Oct 29, 2026, the afternoon preliminary report's high matched the final report's on 181 of 181 days. The final was higher on 0 and lower on 0.
The rules every city shares · Reading CLISEA · The Aug 14, 2026 change
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