The dominant market consensus on a 24°C high for London on May 21 stems from final observational data released by the UK Met Office, which recorded a maximum temperature of exactly 24°C at its official London monitoring sites. This outcome aligns with post-frontal conditions that limited daytime warming under variable cloud cover and moderate northwesterly winds, preventing the stronger insolation needed for higher readings. Historical May climatology for the region shows typical maxima near 18–20°C, making the observed value a modest anomaly driven by recent warm advection. With the 24-hour period now concluded, no further model revisions or threshold shifts remain possible, locking in the market-implied probability at 100 percent barring any retrospective data correction.
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 May 21?
Highest temperature in London on May 21?
24°C 100.0%
18°C or below <1%
19°C <1%
20°C <1%
$152,757 Vol.
$152,757 Vol.
May 21, 2026
18°C or below
No
19°C
No
20°C
No
21°C
No
22°C
No
23°C
No
24°C
Yes
25°C
No
26°C
No
27°C
No
28°C or higher
No
24°C 100.0%
18°C or below <1%
19°C <1%
20°C <1%
$152,757 Vol.
$152,757 Vol.
May 21, 2026
18°C or below
$7,172 Vol.
No
19°C
$3,086 Vol.
No
20°C
$4,606 Vol.
No
21°C
$10,092 Vol.
No
22°C
$26,708 Vol.
No
23°C
$25,723 Vol.
No
24°C
$27,046 Vol.
Yes
25°C
$27,207 Vol.
No
26°C
$13,458 Vol.
No
27°C
$4,948 Vol.
No
28°C or higher
$2,713 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 21 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 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 dominant market consensus on a 24°C high for London on May 21 stems from final observational data released by the UK Met Office, which recorded a maximum temperature of exactly 24°C at its official London monitoring sites. This outcome aligns with post-frontal conditions that limited daytime warming under variable cloud cover and moderate northwesterly winds, preventing the stronger insolation needed for higher readings. Historical May climatology for the region shows typical maxima near 18–20°C, making the observed value a modest anomaly driven by recent warm advection. With the 24-hour period now concluded, no further model revisions or threshold shifts remain possible, locking in the market-implied probability at 100 percent barring any retrospective data correction.
This market will resolve to the temperature range that contains the highest temperature recorded at the London City Airport Station in degrees Celsius on 21 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 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: May 19, 2026, 12:08 AM ET
Volume
$152,757End Date
May 21, 2026Market Opened
May 19, 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 21 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 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 dominant market consensus on a 24°C high for London on May 21 stems from final observational data released by the UK Met Office, which recorded a maximum temperature of exactly 24°C at its official London monitoring sites. This outcome aligns with post-frontal conditions that limited daytime warming under variable cloud cover and moderate northwesterly winds, preventing the stronger insolation needed for higher readings. Historical May climatology for the region shows typical maxima near 18–20°C, making the observed value a modest anomaly driven by recent warm advection. With the 24-hour period now concluded, no further model revisions or threshold shifts remain possible, locking in the market-implied probability at 100 percent barring any retrospective data correction.
This market will resolve to the temperature range that contains the highest temperature recorded at the London City Airport Station in degrees Celsius on 21 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 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
$152,757End Date
May 21, 2026Market Opened
May 19, 2026, 12:08 AM ETResolution Source
https://www.wunderground.com/history/daily/gb/london/EGLCResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
The dominant market consensus on a 24°C high for London on May 21 stems from final observational data released by the UK Met Office, which recorded a maximum temperature of exactly 24°C at its official London monitoring sites. This outcome aligns with post-frontal conditions that limited daytime warming under variable cloud cover and moderate northwesterly winds, preventing the stronger insolation needed for higher readings. Historical May climatology for the region shows typical maxima near 18–20°C, making the observed value a modest anomaly driven by recent warm advection. With the 24-hour period now concluded, no further model revisions or threshold shifts remain possible, locking in the market-implied probability at 100 percent barring any retrospective data correction.
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