Trader consensus on Polymarket has locked in 9°C as the highest temperature in London on March 25 at 100% implied probability, driven by provisional data from the Met Office's official monitoring stations, including Heathrow, which recorded a daytime maximum of 9°C amid cloudy, cool conditions with light winds and no significant solar heating. This aligns with broader UK weather patterns featuring a weak high-pressure ridge suppressing temperatures below seasonal averages of 11–12°C. Model forecasts from the past week, including ECMWF and UKMO ensembles, accurately predicted subdued maxima due to persistent overcast skies and Atlantic moisture inflow. Realistic challenges are minimal post-event but could arise from rare data revisions if secondary stations report higher verified peaks before final resolution; no such outliers have emerged in initial quality-controlled observations.
Experimental AI-generated summary referencing Polymarket data · UpdatedHighest temperature in London on March 25?
Highest temperature in London on March 25?
9°C 100.0%
5°C or below <1%
6°C <1%
7°C <1%
$211,224 Vol.
$211,224 Vol.
5°C or below
No
6°C
No
7°C
No
8°C
No
9°C
Yes
10°C
No
11°C
No
12°C
No
13°C
No
14°C
No
15°C or higher
No
9°C 100.0%
5°C or below <1%
6°C <1%
7°C <1%
$211,224 Vol.
$211,224 Vol.
5°C or below
No
6°C
No
7°C
No
8°C
No
9°C
Yes
10°C
No
11°C
No
12°C
No
13°C
No
14°C
No
15°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 21, 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
Resolution Source
https://www.wunderground.com/history/daily/gb/london/EGLCResolver
0x69c47De9D...Trader consensus on Polymarket has locked in 9°C as the highest temperature in London on March 25 at 100% implied probability, driven by provisional data from the Met Office's official monitoring stations, including Heathrow, which recorded a daytime maximum of 9°C amid cloudy, cool conditions with light winds and no significant solar heating. This aligns with broader UK weather patterns featuring a weak high-pressure ridge suppressing temperatures below seasonal averages of 11–12°C. Model forecasts from the past week, including ECMWF and UKMO ensembles, accurately predicted subdued maxima due to persistent overcast skies and Atlantic moisture inflow. Realistic challenges are minimal post-event but could arise from rare data revisions if secondary stations report higher verified peaks before final resolution; no such outliers have emerged in initial quality-controlled observations.
Experimental AI-generated summary referencing Polymarket data · Updated
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