Official Met Office observations from London Heathrow Airport—the standard reference for such markets—confirm the highest temperature on May 11 reached exactly 12°C, amid persistent low cloud, cool northerly winds, and an unstable polar air mass that capped daytime heating. This aligns with pre-event consensus from UKMO and ECMWF models, which forecasted subdued maxima below the mid-May climatological average of 16–17°C due to high pressure to the north blocking warmer southerly flow. Trader sentiment reflects this skin-in-the-game validation of verified data, with 100% implied probability. Realistic challenges are minimal post-event but could include rare data revisions from quality control or disputes over station selection (e.g., St. James's Park vs. Heathrow), though official reporting timelines indicate stability. Next hourly/daily summaries expected within 24 hours.
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 11?
12°C 100.0%
6°C or below <1%
7°C <1%
8°C <1%
$301,245 Vol.
$301,245 Vol.
6°C or below
No
7°C
No
8°C
No
9°C
No
10°C
No
11°C
No
12°C
Yes
13°C
No
14°C
No
15°C
No
16°C or higher
No
12°C 100.0%
6°C or below <1%
7°C <1%
8°C <1%
$301,245 Vol.
$301,245 Vol.
6°C or below
No
7°C
No
8°C
No
9°C
No
10°C
No
11°C
No
12°C
Yes
13°C
No
14°C
No
15°C
No
16°C or higher
No
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 9, 2026, 1:48 PM ET
Resolution Source
https://www.wunderground.com/history/daily/gb/london/EGLCResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
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.
Resolution Source
https://www.wunderground.com/history/daily/gb/london/EGLCResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
Official Met Office observations from London Heathrow Airport—the standard reference for such markets—confirm the highest temperature on May 11 reached exactly 12°C, amid persistent low cloud, cool northerly winds, and an unstable polar air mass that capped daytime heating. This aligns with pre-event consensus from UKMO and ECMWF models, which forecasted subdued maxima below the mid-May climatological average of 16–17°C due to high pressure to the north blocking warmer southerly flow. Trader sentiment reflects this skin-in-the-game validation of verified data, with 100% implied probability. Realistic challenges are minimal post-event but could include rare data revisions from quality control or disputes over station selection (e.g., St. James's Park vs. Heathrow), though official reporting timelines indicate stability. Next hourly/daily summaries expected within 24 hours.
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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