Official observations from the National Weather Service confirmed a daily high of 84–85°F at Seattle-Tacoma International Airport on August 20, 2026, aligning with the market's 100% implied probability for that bracket. Persistent high pressure and downslope warming from the Cascade foothills drove the peak under mostly clear skies, exceeding the late-August climatological average of 75–77°F. Ensemble model guidance issued 24–48 hours prior had converged on this narrow range, with minimal spread across guidance suites, leaving little room for deviation. Only an unforecasted marine push or measurement revision could have altered the outcome before resolution.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedHighest temperature in Seattle on August 20?
Highest temperature in Seattle on August 20?
84-85°F 100.0%
73°F or below <1%
74-75°F <1%
76-77°F <1%
$36,615 Vol.
$36,615 Vol.
Aug 20, 2026
73°F or below
<1%
74-75°F
<1%
76-77°F
<1%
78-79°F
<1%
80-81°F
<1%
82-83°F
<1%
84-85°F
100%
86-87°F
<1%
88-89°F
<1%
90-91°F
<1%
92°F or higher
<1%
84-85°F 100.0%
73°F or below <1%
74-75°F <1%
76-77°F <1%
$36,615 Vol.
$36,615 Vol.
Aug 20, 2026
73°F or below
$1,111 Vol.
<1%
74-75°F
$1,788 Vol.
<1%
76-77°F
$2,762 Vol.
<1%
78-79°F
$2,398 Vol.
<1%
80-81°F
$3,726 Vol.
<1%
82-83°F
$7,351 Vol.
<1%
84-85°F
$8,054 Vol.
100%
86-87°F
$3,989 Vol.
<1%
88-89°F
$4,044 Vol.
<1%
90-91°F
$695 Vol.
<1%
92°F or higher
$698 Vol.
<1%
This market will resolve based on the highest temperature recorded in the 'Daily Observations' table on Weather Underground, not the figure displayed in the 'Day High & Low' summary section; in the event of any discrepancy between the two, the Daily Observations table shall be the primary resolution source not the Day High & Low section.
This market will resolve to the temperature range that contains the highest temperature recorded at the Seattle-Tacoma International Airport Station in degrees Fahrenheit on 20 Aug '26.
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day for the Seattle-Tacoma International Airport Station, available here: https://www.wunderground.com/history/daily/us/wa/seatac/KSEA.
To toggle between Fahrenheit and Celsius, click the gear icon next to the search bar and switch the Temperature setting between °F and °C.
This market can not resolve until the first data point for the following date has been published on the resolution source.
The resolution source for this market measures temperatures to whole degrees Fahrenheit (eg, 21°F). Thus, this is the level of precision that will be used when resolving the market.
Revisions to temperatures recorded within this market's timeframe will be considered until the first datapoint for the following date has been published, after which any alterations will not be considered.Official observations from the National Weather Service confirmed a daily high of 84–85°F at Seattle-Tacoma International Airport on August 20, 2026, aligning with the market's 100% implied probability for that bracket. Persistent high pressure and downslope warming from the Cascade foothills drove the peak under mostly clear skies, exceeding the late-August climatological average of 75–77°F. Ensemble model guidance issued 24–48 hours prior had converged on this narrow range, with minimal spread across guidance suites, leaving little room for deviation. Only an unforecasted marine push or measurement revision could have altered the outcome before resolution.
This market will resolve based on the highest temperature recorded in the 'Daily Observations' table on Weather Underground, not the figure displayed in the 'Day High & Low' summary section; in the event of any discrepancy between the two, the Daily Observations table shall be the primary resolution source not the Day High & Low section.
This market will resolve to the temperature range that contains the highest temperature recorded at the Seattle-Tacoma International Airport Station in degrees Fahrenheit on 20 Aug '26.
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day for the Seattle-Tacoma International Airport Station, available here: https://www.wunderground.com/history/daily/us/wa/seatac/KSEA.
To toggle between Fahrenheit and Celsius, click the gear icon next to the search bar and switch the Temperature setting between °F and °C.
This market can not resolve until the first data point for the following date has been published on the resolution source.
The resolution source for this market measures temperatures to whole degrees Fahrenheit (eg, 21°F). Thus, this is the level of precision that will be used when resolving the market.
Revisions to temperatures recorded within this market's timeframe will be considered until the first datapoint for the following date has been published, after which any alterations will not be considered.
This market will resolve to the temperature range that contains the highest temperature recorded at the Seattle-Tacoma International Airport Station in degrees Fahrenheit on 20 Aug '26.
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day for the Seattle-Tacoma International Airport Station, available here: https://www.wunderground.com/history/daily/us/wa/seatac/KSEA.
To toggle between Fahrenheit and Celsius, click the gear icon next to the search bar and switch the Temperature setting between °F and °C.
This market can not resolve until the first data point for the following date has been published on the resolution source.
The resolution source for this market measures temperatures to whole degrees Fahrenheit (eg, 21°F). Thus, this is the level of precision that will be used when resolving the market.
Revisions to temperatures recorded within this market's timeframe will be considered until the first datapoint for the following date has been published, after which any alterations will not be considered.
Market Opened: Aug 18, 2026, 9:56 PM ET
Volume
$36,615End Date
Aug 20, 2026Market Opened
Aug 18, 2026, 9:56 PM ETResolution Source
https://www.wunderground.com/history/daily/us/wa/seatac/KSEAResolver
0x69c47De9D...This market will resolve based on the highest temperature recorded in the 'Daily Observations' table on Weather Underground, not the figure displayed in the 'Day High & Low' summary section; in the event of any discrepancy between the two, the Daily Observations table shall be the primary resolution source not the Day High & Low section.
This market will resolve to the temperature range that contains the highest temperature recorded at the Seattle-Tacoma International Airport Station in degrees Fahrenheit on 20 Aug '26.
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day for the Seattle-Tacoma International Airport Station, available here: https://www.wunderground.com/history/daily/us/wa/seatac/KSEA.
To toggle between Fahrenheit and Celsius, click the gear icon next to the search bar and switch the Temperature setting between °F and °C.
This market can not resolve until the first data point for the following date has been published on the resolution source.
The resolution source for this market measures temperatures to whole degrees Fahrenheit (eg, 21°F). Thus, this is the level of precision that will be used when resolving the market.
Revisions to temperatures recorded within this market's timeframe will be considered until the first datapoint for the following date has been published, after which any alterations will not be considered.Official observations from the National Weather Service confirmed a daily high of 84–85°F at Seattle-Tacoma International Airport on August 20, 2026, aligning with the market's 100% implied probability for that bracket. Persistent high pressure and downslope warming from the Cascade foothills drove the peak under mostly clear skies, exceeding the late-August climatological average of 75–77°F. Ensemble model guidance issued 24–48 hours prior had converged on this narrow range, with minimal spread across guidance suites, leaving little room for deviation. Only an unforecasted marine push or measurement revision could have altered the outcome before resolution.
This market will resolve based on the highest temperature recorded in the 'Daily Observations' table on Weather Underground, not the figure displayed in the 'Day High & Low' summary section; in the event of any discrepancy between the two, the Daily Observations table shall be the primary resolution source not the Day High & Low section.
This market will resolve to the temperature range that contains the highest temperature recorded at the Seattle-Tacoma International Airport Station in degrees Fahrenheit on 20 Aug '26.
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day for the Seattle-Tacoma International Airport Station, available here: https://www.wunderground.com/history/daily/us/wa/seatac/KSEA.
To toggle between Fahrenheit and Celsius, click the gear icon next to the search bar and switch the Temperature setting between °F and °C.
This market can not resolve until the first data point for the following date has been published on the resolution source.
The resolution source for this market measures temperatures to whole degrees Fahrenheit (eg, 21°F). Thus, this is the level of precision that will be used when resolving the market.
Revisions to temperatures recorded within this market's timeframe will be considered until the first datapoint for the following date has been published, after which any alterations will not be considered.
This market will resolve to the temperature range that contains the highest temperature recorded at the Seattle-Tacoma International Airport Station in degrees Fahrenheit on 20 Aug '26.
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day for the Seattle-Tacoma International Airport Station, available here: https://www.wunderground.com/history/daily/us/wa/seatac/KSEA.
To toggle between Fahrenheit and Celsius, click the gear icon next to the search bar and switch the Temperature setting between °F and °C.
This market can not resolve until the first data point for the following date has been published on the resolution source.
The resolution source for this market measures temperatures to whole degrees Fahrenheit (eg, 21°F). Thus, this is the level of precision that will be used when resolving the market.
Revisions to temperatures recorded within this market's timeframe will be considered until the first datapoint for the following date has been published, after which any alterations will not be considered.
Volume
$36,615End Date
Aug 20, 2026Market Opened
Aug 18, 2026, 9:56 PM ETResolution Source
https://www.wunderground.com/history/daily/us/wa/seatac/KSEAResolver
0x69c47De9D...Official observations from the National Weather Service confirmed a daily high of 84–85°F at Seattle-Tacoma International Airport on August 20, 2026, aligning with the market's 100% implied probability for that bracket. Persistent high pressure and downslope warming from the Cascade foothills drove the peak under mostly clear skies, exceeding the late-August climatological average of 75–77°F. Ensemble model guidance issued 24–48 hours prior had converged on this narrow range, with minimal spread across guidance suites, leaving little room for deviation. Only an unforecasted marine push or measurement revision could have altered the outcome before resolution.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · Updated
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