Official Met Office observations from London Heathrow Airport—the standard reference station for such markets—recorded a maximum temperature of 11°C on March 28, solidifying trader consensus at virtually 100% implied probability for this outcome amid cool northerly winds, extensive cloud cover, and limited solar heating. This aligns precisely with pre-event forecast ensembles from the Met Office and ECMWF models, which converged on a 10–11°C range due to a blocking high-pressure system steering chilly air masses southward. Late March climatology supports this, with historical Heathrow averages near 11°C, though occasional warm anomalies occur. Realistic challenges are negligible post-resolution, barring rare data revisions from quality-controlled measurements.
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%
6°C or below <1%
7°C <1%
8°C <1%
$308,005 Vol.
$308,005 Vol.
6°C or below
No
7°C
No
8°C
No
9°C
No
10°C
No
11°C
Yes
12°C
No
13°C
No
14°C
No
15°C
No
16°C or higher
No
11°C 100.0%
6°C or below <1%
7°C <1%
8°C <1%
$308,005 Vol.
$308,005 Vol.
6°C or below
No
7°C
No
8°C
No
9°C
No
10°C
No
11°C
Yes
12°C
No
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: 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 London Heathrow Airport—the standard reference station for such markets—recorded a maximum temperature of 11°C on March 28, solidifying trader consensus at virtually 100% implied probability for this outcome amid cool northerly winds, extensive cloud cover, and limited solar heating. This aligns precisely with pre-event forecast ensembles from the Met Office and ECMWF models, which converged on a 10–11°C range due to a blocking high-pressure system steering chilly air masses southward. Late March climatology supports this, with historical Heathrow averages near 11°C, though occasional warm anomalies occur. Realistic challenges are negligible post-resolution, barring rare data revisions from quality-controlled measurements.
Experimental AI-generated summary referencing Polymarket data · Updated
Beware of external links.
Beware of external links.
Frequently Asked Questions