Recent official observations from the National Weather Service and regional weather stations confirm Seattle reached a daily high of 66°F on May 20 under mostly cloudy skies with isolated light sprinkles. A strengthening high-pressure ridge limited daytime solar heating and kept temperatures below the May climatological average of 68°F, anchoring readings firmly in the mid-60s. This meteorological setup, consistent across forecast models and surface data, underpins the market’s overwhelming 99.9% implied probability for the 66–67°F outcome. A realistic challenge would require an unexpected late-day clearing that allowed additional warming or a revision in the official KSEA station reading, though neither appears likely given the settled post-event analysis.
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 May 20?
Highest temperature in Seattle on May 20?
$20,658 Vol.
$20,658 Vol.
May 20, 2026
66-67°F
100%
68°F or higher
<1%
$20,658 Vol.
$20,658 Vol.
May 20, 2026
66-67°F
$2,895 Vol.
100%
68°F or higher
$3,740 Vol.
<1%
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 May '26.
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day by the Forecast for the Seattle-Tacoma International Airport Station once information is finalized, 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 to "Yes" until all data for this date has been finalized.
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.
Any revisions to temperatures recorded after data is finalized for this market's timeframe will not be considered for this market's resolution.Recent official observations from the National Weather Service and regional weather stations confirm Seattle reached a daily high of 66°F on May 20 under mostly cloudy skies with isolated light sprinkles. A strengthening high-pressure ridge limited daytime solar heating and kept temperatures below the May climatological average of 68°F, anchoring readings firmly in the mid-60s. This meteorological setup, consistent across forecast models and surface data, underpins the market’s overwhelming 99.9% implied probability for the 66–67°F outcome. A realistic challenge would require an unexpected late-day clearing that allowed additional warming or a revision in the official KSEA station reading, though neither appears likely given the settled post-event analysis.
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 May '26.
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day by the Forecast for the Seattle-Tacoma International Airport Station once information is finalized, 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 to "Yes" until all data for this date has been finalized.
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.
Any revisions to temperatures recorded after data is finalized for this market's timeframe will not be considered for this market's resolution.
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day by the Forecast for the Seattle-Tacoma International Airport Station once information is finalized, 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 to "Yes" until all data for this date has been finalized.
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.
Any revisions to temperatures recorded after data is finalized for this market's timeframe will not be considered for this market's resolution.
Market Opened: May 18, 2026, 12:11 AM ET
Volume
$20,658End Date
May 20, 2026Market Opened
May 18, 2026, 12:11 AM ETResolution Source
https://www.wunderground.com/history/daily/us/wa/seatac/KSEAResolver
0x69c47De9D...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 May '26.
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day by the Forecast for the Seattle-Tacoma International Airport Station once information is finalized, 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 to "Yes" until all data for this date has been finalized.
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.
Any revisions to temperatures recorded after data is finalized for this market's timeframe will not be considered for this market's resolution.Recent official observations from the National Weather Service and regional weather stations confirm Seattle reached a daily high of 66°F on May 20 under mostly cloudy skies with isolated light sprinkles. A strengthening high-pressure ridge limited daytime solar heating and kept temperatures below the May climatological average of 68°F, anchoring readings firmly in the mid-60s. This meteorological setup, consistent across forecast models and surface data, underpins the market’s overwhelming 99.9% implied probability for the 66–67°F outcome. A realistic challenge would require an unexpected late-day clearing that allowed additional warming or a revision in the official KSEA station reading, though neither appears likely given the settled post-event analysis.
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 May '26.
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day by the Forecast for the Seattle-Tacoma International Airport Station once information is finalized, 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 to "Yes" until all data for this date has been finalized.
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.
Any revisions to temperatures recorded after data is finalized for this market's timeframe will not be considered for this market's resolution.
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day by the Forecast for the Seattle-Tacoma International Airport Station once information is finalized, 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 to "Yes" until all data for this date has been finalized.
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.
Any revisions to temperatures recorded after data is finalized for this market's timeframe will not be considered for this market's resolution.
Volume
$20,658End Date
May 20, 2026Market Opened
May 18, 2026, 12:11 AM ETResolution Source
https://www.wunderground.com/history/daily/us/wa/seatac/KSEAResolver
0x69c47De9D...Recent official observations from the National Weather Service and regional weather stations confirm Seattle reached a daily high of 66°F on May 20 under mostly cloudy skies with isolated light sprinkles. A strengthening high-pressure ridge limited daytime solar heating and kept temperatures below the May climatological average of 68°F, anchoring readings firmly in the mid-60s. This meteorological setup, consistent across forecast models and surface data, underpins the market’s overwhelming 99.9% implied probability for the 66–67°F outcome. A realistic challenge would require an unexpected late-day clearing that allowed additional warming or a revision in the official KSEA station reading, though neither appears likely given the settled post-event analysis.
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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