Trader consensus on Polymarket heavily favors a London high of 12°C (30.5%) or 13°C (26.5%) for March 27, driven by the latest Met Office and ECMWF ensemble forecasts projecting maximums in that narrow 11-14°C range amid a building high-pressure ridge ushering mild Atlantic air. Differentiating factors include subtle model divergences on afternoon cloud breaks—ECMWF hints at clearer skies boosting 13°C potential, while GFS conservatively caps at 12°C under lingering stratocumulus. March climatology supports this, with Heathrow records averaging 11.5°C; northerly breezes and urban heat island effects add 1°C variability, explaining the tight odds race as traders await Thursday's 12Z model runs.
Experimental AI-generated summary referencing Polymarket data · UpdatedHighest temperature in London on March 27?
Highest temperature in London on March 27?
12°C 31%
13°C 26%
11°C 19%
14°C 13%
$13,872 Vol.
$13,872 Vol.
8°C or below
<1%
9°C
3%
10°C
7%
11°C
19%
12°C
31%
13°C
26%
14°C
13%
15°C
6%
16°C
2%
17°C
2%
18°C or higher
1%
12°C 31%
13°C 26%
11°C 19%
14°C 13%
$13,872 Vol.
$13,872 Vol.
8°C or below
<1%
9°C
3%
10°C
7%
11°C
19%
12°C
31%
13°C
26%
14°C
13%
15°C
6%
16°C
2%
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...Trader consensus on Polymarket heavily favors a London high of 12°C (30.5%) or 13°C (26.5%) for March 27, driven by the latest Met Office and ECMWF ensemble forecasts projecting maximums in that narrow 11-14°C range amid a building high-pressure ridge ushering mild Atlantic air. Differentiating factors include subtle model divergences on afternoon cloud breaks—ECMWF hints at clearer skies boosting 13°C potential, while GFS conservatively caps at 12°C under lingering stratocumulus. March climatology supports this, with Heathrow records averaging 11.5°C; northerly breezes and urban heat island effects add 1°C variability, explaining the tight odds race as traders await Thursday's 12Z model runs.
Experimental AI-generated summary referencing Polymarket data · Updated
Beware of external links.
Beware of external links.
Frequently Asked Questions