Official Met Office observations from Heathrow Airport—the primary station for London temperature records—confirm the highest temperature on March 28 reached exactly 11°C, driving trader consensus to a near-certain 100% implied probability. Cloudy skies, patchy light drizzle, and a cool northerly airflow limited daytime heating, aligning precisely with pre-event forecast ensembles from UK Met Office and ECMWF models that projected a tight 10–11°C range. This fits March climatology, where London maxima average 11–12°C amid typical spring variability. While quality-control revisions to provisional data occur rarely, an upward adjustment from a secondary site like St James's Park could challenge the outcome, though none are anticipated.
Experimental AI-generated summary referencing Polymarket data · UpdatedHighest temperature in London on March 28?
Highest temperature in London on March 28?
11°C 100.0%
12°C <1%
13°C <1%
14°C <1%
$306,966 Vol.
$306,966 Vol.
11°C
100%
12°C
<1%
13°C
<1%
14°C
<1%
15°C
<1%
16°C or higher
<1%
11°C 100.0%
12°C <1%
13°C <1%
14°C <1%
$306,966 Vol.
$306,966 Vol.
11°C
100%
12°C
<1%
13°C
<1%
14°C
<1%
15°C
<1%
16°C or higher
<1%
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: Mar 24, 2026, 6:01 AM 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 Heathrow Airport—the primary station for London temperature records—confirm the highest temperature on March 28 reached exactly 11°C, driving trader consensus to a near-certain 100% implied probability. Cloudy skies, patchy light drizzle, and a cool northerly airflow limited daytime heating, aligning precisely with pre-event forecast ensembles from UK Met Office and ECMWF models that projected a tight 10–11°C range. This fits March climatology, where London maxima average 11–12°C amid typical spring variability. While quality-control revisions to provisional data occur rarely, an upward adjustment from a secondary site like St James's Park could challenge the outcome, though none are anticipated.
Experimental AI-generated summary referencing Polymarket data · Updated


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