Official Met Office observations at Heathrow Airport confirm London's highest temperature on April 25, 2026, peaked at 21°C around 3:00 PM BST, aligning precisely with pre-event forecast model ensembles and driving trader consensus to 100% on this outcome. This reading, echoed at London City Airport per resolution criteria, exceeded the late-April climatological average of 15–16°C due to persistent high-pressure ridging fostering clear skies, light winds, and ample solar heating following earlier April heatwaves surpassing 26°C. While provisional maxima rarely revise, discrepancies across official synoptic stations or late-reported data from remote sensors could theoretically challenge the positioning, though current evidence solidifies the market 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 London on April 25?
Highest temperature in London on April 25?
21°C 100.0%
15°C or below <1%
16°C <1%
17°C <1%
$295,176 Vol.
$295,176 Vol.
Apr 25, 2026
15°C or below
No
16°C
No
17°C
No
18°C
No
19°C
No
20°C
No
21°C
Yes
22°C
No
23°C
No
24°C
No
25°C or higher
No
21°C 100.0%
15°C or below <1%
16°C <1%
17°C <1%
$295,176 Vol.
$295,176 Vol.
Apr 25, 2026
15°C or below
$23,124 Vol.
No
16°C
$20,356 Vol.
No
17°C
$15,161 Vol.
No
18°C
$32,295 Vol.
No
19°C
$35,004 Vol.
No
20°C
$54,340 Vol.
No
21°C
$48,902 Vol.
Yes
22°C
$36,200 Vol.
No
23°C
$11,818 Vol.
No
24°C
$6,392 Vol.
No
25°C or higher
$11,583 Vol.
No
This market will resolve to the temperature range that contains the highest temperature recorded at the London City Airport Station in degrees Celsius on 25 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 London City Airport Station once information is finalized, available here: https://www.wunderground.com/history/daily/gb/london/EGLC.
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 Celsius (eg, 9°C). 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 Met Office observations at Heathrow Airport confirm London's highest temperature on April 25, 2026, peaked at 21°C around 3:00 PM BST, aligning precisely with pre-event forecast model ensembles and driving trader consensus to 100% on this outcome. This reading, echoed at London City Airport per resolution criteria, exceeded the late-April climatological average of 15–16°C due to persistent high-pressure ridging fostering clear skies, light winds, and ample solar heating following earlier April heatwaves surpassing 26°C. While provisional maxima rarely revise, discrepancies across official synoptic stations or late-reported data from remote sensors could theoretically challenge the positioning, though current evidence solidifies the market resolution.
This market will resolve to the temperature range that contains the highest temperature recorded at the London City Airport Station in degrees Celsius on 25 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 London City Airport Station once information is finalized, available here: https://www.wunderground.com/history/daily/gb/london/EGLC.
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 Celsius (eg, 9°C). 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 London City Airport Station once information is finalized, available here: https://www.wunderground.com/history/daily/gb/london/EGLC.
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 Celsius (eg, 9°C). 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 23, 2026, 12:08 AM ET
Volume
$295,176End Date
Apr 25, 2026Market Opened
Apr 23, 2026, 12:08 AM ETResolution Source
https://www.wunderground.com/history/daily/gb/london/EGLCResolver
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 London City Airport Station in degrees Celsius on 25 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 London City Airport Station once information is finalized, available here: https://www.wunderground.com/history/daily/gb/london/EGLC.
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 Celsius (eg, 9°C). 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 Met Office observations at Heathrow Airport confirm London's highest temperature on April 25, 2026, peaked at 21°C around 3:00 PM BST, aligning precisely with pre-event forecast model ensembles and driving trader consensus to 100% on this outcome. This reading, echoed at London City Airport per resolution criteria, exceeded the late-April climatological average of 15–16°C due to persistent high-pressure ridging fostering clear skies, light winds, and ample solar heating following earlier April heatwaves surpassing 26°C. While provisional maxima rarely revise, discrepancies across official synoptic stations or late-reported data from remote sensors could theoretically challenge the positioning, though current evidence solidifies the market resolution.
This market will resolve to the temperature range that contains the highest temperature recorded at the London City Airport Station in degrees Celsius on 25 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 London City Airport Station once information is finalized, available here: https://www.wunderground.com/history/daily/gb/london/EGLC.
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 Celsius (eg, 9°C). 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 London City Airport Station once information is finalized, available here: https://www.wunderground.com/history/daily/gb/london/EGLC.
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 Celsius (eg, 9°C). 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
$295,176End Date
Apr 25, 2026Market Opened
Apr 23, 2026, 12:08 AM ETResolution Source
https://www.wunderground.com/history/daily/gb/london/EGLCResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
Official Met Office observations at Heathrow Airport confirm London's highest temperature on April 25, 2026, peaked at 21°C around 3:00 PM BST, aligning precisely with pre-event forecast model ensembles and driving trader consensus to 100% on this outcome. This reading, echoed at London City Airport per resolution criteria, exceeded the late-April climatological average of 15–16°C due to persistent high-pressure ridging fostering clear skies, light winds, and ample solar heating following earlier April heatwaves surpassing 26°C. While provisional maxima rarely revise, discrepancies across official synoptic stations or late-reported data from remote sensors could theoretically challenge the positioning, though current evidence solidifies the market 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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