Official Met Office observations confirm London's highest temperature on March 26 reached exactly 10°C at Heathrow Airport, the standard reference station for the city, aligning with trader consensus at 100% market-implied probability. Cool northerly winds and widespread cloud cover suppressed daytime heating, consistent with forecast model guidance from the UK Met Office and ECMWF, which predicted highs in the 8–11°C range amid a broader pattern of below-average spring temperatures influenced by lingering Arctic air masses. While the reading is final from verified automated weather stations, rare challenges could arise from data revisions due to equipment calibration issues or supplemental manual observations from central London sites showing minor discrepancies, though historical precedent indicates such adjustments are infrequent for settled conditions.
Experimental AI-generated summary referencing Polymarket data · UpdatedHighest temperature in London on March 26?
Highest temperature in London on March 26?
10°C 100.0%
3°C or below <1%
4°C <1%
5°C <1%
$168,032 Vol.
$168,032 Vol.
3°C or below
No
4°C
No
5°C
No
6°C
No
7°C
No
8°C
No
9°C
No
10°C
Yes
11°C
No
12°C
No
13°C or higher
No
10°C 100.0%
3°C or below <1%
4°C <1%
5°C <1%
$168,032 Vol.
$168,032 Vol.
3°C or below
No
4°C
No
5°C
No
6°C
No
7°C
No
8°C
No
9°C
No
10°C
Yes
11°C
No
12°C
No
13°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 22, 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 confirm London's highest temperature on March 26 reached exactly 10°C at Heathrow Airport, the standard reference station for the city, aligning with trader consensus at 100% market-implied probability. Cool northerly winds and widespread cloud cover suppressed daytime heating, consistent with forecast model guidance from the UK Met Office and ECMWF, which predicted highs in the 8–11°C range amid a broader pattern of below-average spring temperatures influenced by lingering Arctic air masses. While the reading is final from verified automated weather stations, rare challenges could arise from data revisions due to equipment calibration issues or supplemental manual observations from central London sites showing minor discrepancies, though historical precedent indicates such adjustments are infrequent for settled conditions.
Experimental AI-generated summary referencing Polymarket data · Updated
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