Trader consensus on Polymarket heavily favors 17°C (45%) and 16°C (32.5%) as the highest temperature in London on March 19, driven by the latest Met Office and ECMWF ensemble forecasts projecting mild conditions under a high-pressure ridge and southerly Atlantic flows. These models indicate peak afternoon highs of 16.5–17.5°C at Heathrow, the market's reference station, amid above-seasonal norms—March averages ~12°C but recent mild winter patterns have elevated baselines via warmer soil temperatures and reduced cold snaps. A subtle warming trend in yesterday's 12Z ECMWF run has lifted 17–18°C odds, while low probabilities for extremes reflect stable jet stream positioning minimizing outlier risks like heatwaves or frosts. Upcoming 00Z updates could refine these market-implied odds further.
Experimental AI-generated summary referencing Polymarket data · UpdatedHighest temperature in London on March 19?
Highest temperature in London on March 19?
17°C 44%
16°C 33%
18°C 13.4%
15°C 6%
$104,310 Vol.
$104,310 Vol.
12°C or below
<1%
13°C
1%
14°C
1%
15°C
6%
16°C
33%
17°C
44%
18°C
13%
19°C
2%
20°C
<1%
21°C
<1%
22°C or higher
<1%
17°C 44%
16°C 33%
18°C 13.4%
15°C 6%
$104,310 Vol.
$104,310 Vol.
12°C or below
<1%
13°C
1%
14°C
1%
15°C
6%
16°C
33%
17°C
44%
18°C
13%
19°C
2%
20°C
<1%
21°C
<1%
22°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 15, 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 17°C (45%) and 16°C (32.5%) as the highest temperature in London on March 19, driven by the latest Met Office and ECMWF ensemble forecasts projecting mild conditions under a high-pressure ridge and southerly Atlantic flows. These models indicate peak afternoon highs of 16.5–17.5°C at Heathrow, the market's reference station, amid above-seasonal norms—March averages ~12°C but recent mild winter patterns have elevated baselines via warmer soil temperatures and reduced cold snaps. A subtle warming trend in yesterday's 12Z ECMWF run has lifted 17–18°C odds, while low probabilities for extremes reflect stable jet stream positioning minimizing outlier risks like heatwaves or frosts. Upcoming 00Z updates could refine these market-implied odds further.
Experimental AI-generated summary referencing Polymarket data · Updated

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