Official measurements from Weather Underground's Seattle station confirm a daily maximum of 78–79°F on August 18, 2026, driving the market's 100% implied probability for that bin. This outcome aligns with National Weather Service forecasts and ensemble models that anticipated upper-70s highs under mild onshore flow, gradual clearing, and typical mid-August marine influence, consistent with the region's climatological average near 77–79°F. Minor variables such as afternoon cloud cover or localized heating introduced limited uncertainty beforehand, yet post-event data resolved the market decisively. Only an official data revision or station discrepancy could realistically alter the outcome, scenarios that remain improbable given standardized reporting protocols.
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 18?
Highest temperature in Seattle on August 18?
78-79°F 100.0%
71°F or below <1%
72-73°F <1%
74-75°F <1%
$45,600 Vol.
$45,600 Vol.
Aug 18, 2026
71°F or below
No
72-73°F
No
74-75°F
No
76-77°F
No
78-79°F
Yes
80-81°F
No
82-83°F
No
84-85°F
No
86-87°F
No
88-89°F
No
90°F or higher
No
78-79°F 100.0%
71°F or below <1%
72-73°F <1%
74-75°F <1%
$45,600 Vol.
$45,600 Vol.
Aug 18, 2026
71°F or below
$4,603 Vol.
No
72-73°F
$10,499 Vol.
No
74-75°F
$8,150 Vol.
No
76-77°F
$5,752 Vol.
No
78-79°F
$5,690 Vol.
Yes
80-81°F
$4,038 Vol.
No
82-83°F
$3,384 Vol.
No
84-85°F
$2,196 Vol.
No
86-87°F
$877 Vol.
No
88-89°F
$290 Vol.
No
90°F or higher
$120 Vol.
No
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 18 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 measurements from Weather Underground's Seattle station confirm a daily maximum of 78–79°F on August 18, 2026, driving the market's 100% implied probability for that bin. This outcome aligns with National Weather Service forecasts and ensemble models that anticipated upper-70s highs under mild onshore flow, gradual clearing, and typical mid-August marine influence, consistent with the region's climatological average near 77–79°F. Minor variables such as afternoon cloud cover or localized heating introduced limited uncertainty beforehand, yet post-event data resolved the market decisively. Only an official data revision or station discrepancy could realistically alter the outcome, scenarios that remain improbable given standardized reporting protocols.
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 18 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 18 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 16, 2026, 9:56 PM ET
Volume
$45,600End Date
Aug 18, 2026Market Opened
Aug 16, 2026, 9:56 PM ETResolution Source
https://www.wunderground.com/history/daily/us/wa/seatac/KSEAResolver
0x69c47De9D...Outcome proposed: Yes
No dispute
Final outcome: Yes
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 18 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 measurements from Weather Underground's Seattle station confirm a daily maximum of 78–79°F on August 18, 2026, driving the market's 100% implied probability for that bin. This outcome aligns with National Weather Service forecasts and ensemble models that anticipated upper-70s highs under mild onshore flow, gradual clearing, and typical mid-August marine influence, consistent with the region's climatological average near 77–79°F. Minor variables such as afternoon cloud cover or localized heating introduced limited uncertainty beforehand, yet post-event data resolved the market decisively. Only an official data revision or station discrepancy could realistically alter the outcome, scenarios that remain improbable given standardized reporting protocols.
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 18 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 18 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
$45,600End Date
Aug 18, 2026Market Opened
Aug 16, 2026, 9:56 PM ETResolution Source
https://www.wunderground.com/history/daily/us/wa/seatac/KSEAResolver
0x69c47De9D...Outcome proposed: Yes
No dispute
Final outcome: Yes
Official measurements from Weather Underground's Seattle station confirm a daily maximum of 78–79°F on August 18, 2026, driving the market's 100% implied probability for that bin. This outcome aligns with National Weather Service forecasts and ensemble models that anticipated upper-70s highs under mild onshore flow, gradual clearing, and typical mid-August marine influence, consistent with the region's climatological average near 77–79°F. Minor variables such as afternoon cloud cover or localized heating introduced limited uncertainty beforehand, yet post-event data resolved the market decisively. Only an official data revision or station discrepancy could realistically alter the outcome, scenarios that remain improbable given standardized reporting protocols.
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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