Official National Weather Service observations at Seattle-Tacoma International Airport (KSEA) confirm the highest temperature on April 21, 2026, reached 58°F at 4:53 PM local time, driving trader consensus to 100% on the 58-59°F outcome as final data solidifies. This aligns closely with pre-event forecast model consensus from the National Weather Service, which projected highs near 59°F amid persistent marine layer clouds and cool onshore flow typical for Pacific Northwest spring conditions, suppressing temperatures below seasonal averages (normal max around 57°F). While data revisions are rare post-validation, a realistic challenge would require an official correction from ASOS instrumentation errors or overlooked peak readings, though hourly timeseries show no such anomalies. Traders await full daily climate summary for closure.
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 April 21?
Highest temperature in Seattle on April 21?
58-59°F 100.0%
55°F or below <1%
56-57°F <1%
60-61°F <1%
$128,107 Vol.
$128,107 Vol.
Apr 21, 2026
55°F or below
No
56-57°F
No
58-59°F
Yes
60-61°F
No
62-63°F
No
64-65°F
No
66-67°F
No
68-69°F
No
70-71°F
No
72-73°F
No
74°F or higher
No
58-59°F 100.0%
55°F or below <1%
56-57°F <1%
60-61°F <1%
$128,107 Vol.
$128,107 Vol.
Apr 21, 2026
55°F or below
$15,865 Vol.
No
56-57°F
$13,465 Vol.
No
58-59°F
$19,186 Vol.
Yes
60-61°F
$15,565 Vol.
No
62-63°F
$17,174 Vol.
No
64-65°F
$7,444 Vol.
No
66-67°F
$8,434 Vol.
No
68-69°F
$8,008 Vol.
No
70-71°F
$6,702 Vol.
No
72-73°F
$13,614 Vol.
No
74°F or higher
$2,650 Vol.
No
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 21 Apr '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.Official National Weather Service observations at Seattle-Tacoma International Airport (KSEA) confirm the highest temperature on April 21, 2026, reached 58°F at 4:53 PM local time, driving trader consensus to 100% on the 58-59°F outcome as final data solidifies. This aligns closely with pre-event forecast model consensus from the National Weather Service, which projected highs near 59°F amid persistent marine layer clouds and cool onshore flow typical for Pacific Northwest spring conditions, suppressing temperatures below seasonal averages (normal max around 57°F). While data revisions are rare post-validation, a realistic challenge would require an official correction from ASOS instrumentation errors or overlooked peak readings, though hourly timeseries show no such anomalies. Traders await full daily climate summary for closure.
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 21 Apr '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: Apr 19, 2026, 12:42 AM ET
Volume
$128,107End Date
Apr 21, 2026Market Opened
Apr 19, 2026, 12:42 AM ETResolution Source
https://www.wunderground.com/history/daily/us/wa/seatac/KSEAResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
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 21 Apr '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.Official National Weather Service observations at Seattle-Tacoma International Airport (KSEA) confirm the highest temperature on April 21, 2026, reached 58°F at 4:53 PM local time, driving trader consensus to 100% on the 58-59°F outcome as final data solidifies. This aligns closely with pre-event forecast model consensus from the National Weather Service, which projected highs near 59°F amid persistent marine layer clouds and cool onshore flow typical for Pacific Northwest spring conditions, suppressing temperatures below seasonal averages (normal max around 57°F). While data revisions are rare post-validation, a realistic challenge would require an official correction from ASOS instrumentation errors or overlooked peak readings, though hourly timeseries show no such anomalies. Traders await full daily climate summary for closure.
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 21 Apr '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
$128,107End Date
Apr 21, 2026Market Opened
Apr 19, 2026, 12:42 AM ETResolution Source
https://www.wunderground.com/history/daily/us/wa/seatac/KSEAResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
Official National Weather Service observations at Seattle-Tacoma International Airport (KSEA) confirm the highest temperature on April 21, 2026, reached 58°F at 4:53 PM local time, driving trader consensus to 100% on the 58-59°F outcome as final data solidifies. This aligns closely with pre-event forecast model consensus from the National Weather Service, which projected highs near 59°F amid persistent marine layer clouds and cool onshore flow typical for Pacific Northwest spring conditions, suppressing temperatures below seasonal averages (normal max around 57°F). While data revisions are rare post-validation, a realistic challenge would require an official correction from ASOS instrumentation errors or overlooked peak readings, though hourly timeseries show no such anomalies. Traders await full daily climate summary for closure.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · Updated
Beware of external links.
Beware of external links.
Frequently Asked Questions