Recent Met Office and ECMWF ensemble forecasts, updated within the last 24 hours, pinpoint London's highest temperature on March 27 at 12-13°C, driving the razor-thin trader consensus between these outcomes at over 56% combined implied probability. A mild Atlantic air mass under a weakening high-pressure ridge favors these levels, with southerly winds tempering cooler continental influences, though lingering cloud cover from a frontal boundary introduces uncertainty—potentially capping peaks at 12°C versus clearer skies allowing 13°C. Historical March 27 maxima average 11.5°C at Heathrow (the likely resolution station), but above-normal sea surface temperatures boost model warmth. Traders eye hourly observations for final differentiation, as small diurnal shifts or urban heat could sway resolution.
Experimental AI-generated summary referencing Polymarket data · UpdatedHighest temperature in London on March 27?
Highest temperature in London on March 27?
13°C 30%
12°C 27%
11°C 18%
14°C 10%
$17,288 Vol.
$17,288 Vol.
8°C or below
<1%
9°C
1%
10°C
9%
11°C
18%
12°C
27%
13°C
30%
14°C
10%
15°C
8%
16°C
1%
17°C
2%
18°C or higher
1%
13°C 30%
12°C 27%
11°C 18%
14°C 10%
$17,288 Vol.
$17,288 Vol.
8°C or below
<1%
9°C
1%
10°C
9%
11°C
18%
12°C
27%
13°C
30%
14°C
10%
15°C
8%
16°C
1%
17°C
2%
18°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 23, 2026, 6:01 AM ET
Resolution Source
https://www.wunderground.com/history/daily/gb/london/EGLCResolver
0x69c47De9D...Resolution Source
https://www.wunderground.com/history/daily/gb/london/EGLCResolver
0x69c47De9D...Recent Met Office and ECMWF ensemble forecasts, updated within the last 24 hours, pinpoint London's highest temperature on March 27 at 12-13°C, driving the razor-thin trader consensus between these outcomes at over 56% combined implied probability. A mild Atlantic air mass under a weakening high-pressure ridge favors these levels, with southerly winds tempering cooler continental influences, though lingering cloud cover from a frontal boundary introduces uncertainty—potentially capping peaks at 12°C versus clearer skies allowing 13°C. Historical March 27 maxima average 11.5°C at Heathrow (the likely resolution station), but above-normal sea surface temperatures boost model warmth. Traders eye hourly observations for final differentiation, as small diurnal shifts or urban heat could sway resolution.
Experimental AI-generated summary referencing Polymarket data · Updated
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