Official Met Office observations and Wunderground records from London City Airport station—the market's resolution source—confirm a maximum temperature of 17°C on April 15, 2026, with peaks around mid-afternoon under partly cloudy skies and light winds. This aligns with forecast model consensus from April 14 projecting mid-teens highs amid a cooling trend following the early April heatwave, where Kew Gardens hit a record 26.6°C on April 8. Trader consensus at 100% implied probability reflects verified hourly data across London stations like Heathrow (17.9°C max nearby), far exceeding typical April variability. Realistic challenges include rare post-processing revisions for sensor anomalies, though quality-controlled data rarely shifts after 24 hours. No further updates expected as the event has passed.
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 15?
Highest temperature in London on April 15?
17°C 100.0%
9°C or below <1%
10°C <1%
11°C <1%
$429,295 Vol.
$429,295 Vol.
9°C or below
No
10°C
No
11°C
No
12°C
No
13°C
No
14°C
No
15°C
No
16°C
No
17°C
Yes
18°C
No
19°C or higher
No
17°C 100.0%
9°C or below <1%
10°C <1%
11°C <1%
$429,295 Vol.
$429,295 Vol.
9°C or below
No
10°C
No
11°C
No
12°C
No
13°C
No
14°C
No
15°C
No
16°C
No
17°C
Yes
18°C
No
19°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 13, 2026, 12:05 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 and Wunderground records from London City Airport station—the market's resolution source—confirm a maximum temperature of 17°C on April 15, 2026, with peaks around mid-afternoon under partly cloudy skies and light winds. This aligns with forecast model consensus from April 14 projecting mid-teens highs amid a cooling trend following the early April heatwave, where Kew Gardens hit a record 26.6°C on April 8. Trader consensus at 100% implied probability reflects verified hourly data across London stations like Heathrow (17.9°C max nearby), far exceeding typical April variability. Realistic challenges include rare post-processing revisions for sensor anomalies, though quality-controlled data rarely shifts after 24 hours. No further updates expected as the event has passed.
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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