Trader consensus on Polymarket heavily favors 13°C (62%) as London's highest temperature on March 27, closely trailed by 12°C (37.5%), reflecting the latest Met Office forecast models showing ensemble means around 12.5–13°C amid a high-pressure ridge stabilizing over southern England. Recent developments include updated ECMWF and UKV model runs overnight, which trimmed earlier cool biases by incorporating observed mild air advection from the southwest, with light winds and partial cloud breaks boosting daytime highs above seasonal norms (historical March averages ~11°C). However, inherent forecast uncertainty persists due to model spread on cloud cover thickness and timing; traders await the next 12Z model refresh for potential shifts before resolution based on official Heathrow observations.
Experimental AI-generated summary referencing Polymarket data · UpdatedHighest temperature in London on March 27?
Highest temperature in London on March 27?
13°C 67%
12°C 36%
14°C 2.7%
15°C <1%
$240,524 Vol.
$240,524 Vol.
10°C
<1%
11°C
<1%
12°C
36%
13°C
67%
14°C
3%
15°C
<1%
16°C
<1%
17°C
<1%
18°C or higher
<1%
13°C 67%
12°C 36%
14°C 2.7%
15°C <1%
$240,524 Vol.
$240,524 Vol.
10°C
<1%
11°C
<1%
12°C
36%
13°C
67%
14°C
3%
15°C
<1%
16°C
<1%
17°C
<1%
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...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...Trader consensus on Polymarket heavily favors 13°C (62%) as London's highest temperature on March 27, closely trailed by 12°C (37.5%), reflecting the latest Met Office forecast models showing ensemble means around 12.5–13°C amid a high-pressure ridge stabilizing over southern England. Recent developments include updated ECMWF and UKV model runs overnight, which trimmed earlier cool biases by incorporating observed mild air advection from the southwest, with light winds and partial cloud breaks boosting daytime highs above seasonal norms (historical March averages ~11°C). However, inherent forecast uncertainty persists due to model spread on cloud cover thickness and timing; traders await the next 12Z model refresh for potential shifts before resolution based on official Heathrow observations.
Experimental AI-generated summary referencing Polymarket data · Updated
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