Recent UK Met Office forecasts have established an 18°C daily maximum in London for May 17 under stable high-pressure conditions and light easterly winds, driving the 97.7% market-implied probability for that outcome. This aligns with mid-May climatological norms for the city, where long-term observations show average highs of 15–20°C, with current ensemble models from the European Centre for Medium-Range Weather Forecasts showing tight agreement and limited afternoon warming potential from partial cloud cover. Minor variables such as urban heat-island amplification or brief clear-sky intervals could nudge readings slightly higher or lower, yet the extremely narrow odds on all other bands reflect strong consensus in official guidance ahead of final resolution.
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 May 17?
18°C 96.1%
19°C 2.8%
20°C or higher <1%
10°C or below <1%
$144,610 Vol.
$144,610 Vol.
10°C or below
<1%
11°C
<1%
12°C
<1%
13°C
<1%
14°C
<1%
15°C
<1%
16°C
<1%
17°C
<1%
18°C
96%
19°C
3%
20°C or higher
<1%
18°C 96.1%
19°C 2.8%
20°C or higher <1%
10°C or below <1%
$144,610 Vol.
$144,610 Vol.
10°C or below
<1%
11°C
<1%
12°C
<1%
13°C
<1%
14°C
<1%
15°C
<1%
16°C
<1%
17°C
<1%
18°C
96%
19°C
3%
20°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: May 15, 2026, 12:03 AM ET
Resolution Source
https://www.wunderground.com/history/daily/gb/london/EGLCThe 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/EGLCRecent UK Met Office forecasts have established an 18°C daily maximum in London for May 17 under stable high-pressure conditions and light easterly winds, driving the 97.7% market-implied probability for that outcome. This aligns with mid-May climatological norms for the city, where long-term observations show average highs of 15–20°C, with current ensemble models from the European Centre for Medium-Range Weather Forecasts showing tight agreement and limited afternoon warming potential from partial cloud cover. Minor variables such as urban heat-island amplification or brief clear-sky intervals could nudge readings slightly higher or lower, yet the extremely narrow odds on all other bands reflect strong consensus in official guidance ahead of final resolution.
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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