Met Office hourly forecasts updated early on March 29 project a maximum temperature of 11°C at Heathrow—the official recording station for London—driving trader consensus to near-certainty on this outcome amid persistent cloud cover and cool northerly airflow suppressing daytime heating. Observations from March 28 confirm a similar high of 11.2°C nearby at Hampstead, aligning with model ensembles showing limited solar insolation and weak boundary-layer mixing. This positioning reflects aggregated trader assessment of short-term numerical weather prediction reliability, where high-pressure decay has ushered cooler conditions after early-March warmth exceeding 19°C. Realistic challenges include unanticipated afternoon clearing boosting surface temperatures by 1–2°C, though current synoptic patterns and ensemble guidance deem this improbable; provisional daily records expected by evening.
Experimental AI-generated summary referencing Polymarket data · UpdatedHighest temperature in London on March 29?
Highest temperature in London on March 29?
11°C 100.0%
12°C <1%
13°C <1%
14°C <1%
$497,637 Vol.
$497,637 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%
$497,637 Vol.
$497,637 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 25, 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
Met Office hourly forecasts updated early on March 29 project a maximum temperature of 11°C at Heathrow—the official recording station for London—driving trader consensus to near-certainty on this outcome amid persistent cloud cover and cool northerly airflow suppressing daytime heating. Observations from March 28 confirm a similar high of 11.2°C nearby at Hampstead, aligning with model ensembles showing limited solar insolation and weak boundary-layer mixing. This positioning reflects aggregated trader assessment of short-term numerical weather prediction reliability, where high-pressure decay has ushered cooler conditions after early-March warmth exceeding 19°C. Realistic challenges include unanticipated afternoon clearing boosting surface temperatures by 1–2°C, though current synoptic patterns and ensemble guidance deem this improbable; provisional daily records expected by evening.
Experimental AI-generated summary referencing Polymarket data · Updated
Beware of external links.
Beware of external links.
Frequently Asked Questions