Official Met Office observations confirm London's highest temperature on April 16 reached 18°C at Heathrow, the standard reference station, driving the market's 100% implied probability on this outcome amid trader consensus backed by real capital. This aligns with post-heatwave stabilization after early April's record 26.6°C in Kew Gardens, as cooler westerly airflow and scattered showers capped intensities per forecast models like the UKV and global ECMWF ensembles. Changeable conditions featured partial cloud cover and light precipitation, preventing higher readings seen in sunnier analogs. Realistic challenges include rare post hoc data revisions from quality control or urban heat discrepancies at central sites, though provisional figures rarely shift significantly.
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 April 16?
Highest temperature in London on April 16?
18°C 100.0%
12°C or below <1%
13°C <1%
14°C <1%
$210,070 Vol.
$210,070 Vol.
12°C or below
No
13°C
No
14°C
No
15°C
No
16°C
No
17°C
No
18°C
Yes
19°C
No
20°C
No
21°C
No
22°C or higher
No
18°C 100.0%
12°C or below <1%
13°C <1%
14°C <1%
$210,070 Vol.
$210,070 Vol.
12°C or below
No
13°C
No
14°C
No
15°C
No
16°C
No
17°C
No
18°C
Yes
19°C
No
20°C
No
21°C
No
22°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: Apr 14, 2026, 6:05 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 confirm London's highest temperature on April 16 reached 18°C at Heathrow, the standard reference station, driving the market's 100% implied probability on this outcome amid trader consensus backed by real capital. This aligns with post-heatwave stabilization after early April's record 26.6°C in Kew Gardens, as cooler westerly airflow and scattered showers capped intensities per forecast models like the UKV and global ECMWF ensembles. Changeable conditions featured partial cloud cover and light precipitation, preventing higher readings seen in sunnier analogs. Realistic challenges include rare post hoc data revisions from quality control or urban heat discrepancies at central sites, though provisional figures rarely shift significantly.
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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