Official Met Office observations from London City Airport—the market's designated station—confirm the highest temperature on March 27 reached exactly 12°C, driving trader consensus to 100% implied probability for that outcome amid negligible odds on alternatives. Cloudy skies and persistent showers from a southeastward-moving band of low pressure suppressed daytime heating, consistent with ECMWF and UK model forecasts that anticipated mild but overcast conditions; regional maxima hit 13°C at Heathrow and a UK-high 14.8°C at Usk No. 2. This aligns with March climatology, where London averages 10–12°C highs, though recent weeks saw warmer spikes like 19.2°C at Northolt. Post-verification, only a rare data audit could challenge resolution, but measurements are final.
Experimental AI-generated summary referencing Polymarket data · UpdatedHighest temperature in London on March 27?
Highest temperature in London on March 27?
12°C 100.0%
8°C or below <1%
9°C <1%
10°C <1%
$328,187 Vol.
$328,187 Vol.
8°C or below
No
9°C
No
10°C
No
11°C
No
12°C
Yes
13°C
No
14°C
No
15°C
No
16°C
No
17°C
No
18°C or higher
No
12°C 100.0%
8°C or below <1%
9°C <1%
10°C <1%
$328,187 Vol.
$328,187 Vol.
8°C or below
No
9°C
No
10°C
No
11°C
No
12°C
Yes
13°C
No
14°C
No
15°C
No
16°C
No
17°C
No
18°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 23, 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
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 from London City Airport—the market's designated station—confirm the highest temperature on March 27 reached exactly 12°C, driving trader consensus to 100% implied probability for that outcome amid negligible odds on alternatives. Cloudy skies and persistent showers from a southeastward-moving band of low pressure suppressed daytime heating, consistent with ECMWF and UK model forecasts that anticipated mild but overcast conditions; regional maxima hit 13°C at Heathrow and a UK-high 14.8°C at Usk No. 2. This aligns with March climatology, where London averages 10–12°C highs, though recent weeks saw warmer spikes like 19.2°C at Northolt. Post-verification, only a rare data audit could challenge resolution, but measurements are final.
Experimental AI-generated summary referencing Polymarket data · Updated
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