TOTAL VOLUME:
$134b
24H VOL:
$103,397,351
24H TRANSACTIONS:
2,388,728,490
OPEN INTEREST:
$1,410,176,180
399,592
Markets across
30,097
events
MATCHED EVENTS:
2,622
PLATFORM COVERAGE:
5
Polymarket:
39%
VS.
Kalshi:
61%
Closed: May 27, 8:00 AM EST
Polymarket
This market will resolve to the temperature range that contains the highest temperature recorded at the London City Airport Station in degrees Celsius on 27 May '26. The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day for the London City Airport Station, 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 until the first data point for the following date has been published on the resolution source. 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.
Prediction market odds reflect real-money consensus from traders betting on London's May 27 high temperature, whereas traditional analyst forecasts rely on meteorological models and expert judgment. Markets often incorporate broader information faster than static forecasts, but both sources have merit. Comparing the market's implied temperature range to UK Met Office or other weather services can reveal where traders diverge from official predictions, highlighting either market inefficiency or emerging data that analysts have not yet fully weighted.
The market resolves on May 27, 2026, after the highest temperature in London on May 27 has been recorded and verified. Resolution is determined by the actual observed maximum temperature on that date, measured according to standard meteorological protocols. Once the official reading is confirmed, the contract corresponding to the correct temperature outcome is settled at full value, and all other outcomes expire worthless. Traders should monitor official weather station data as the event date approaches.
Major weather pattern shifts, seasonal forecasts, and atmospheric pressure systems will drive price movements leading up to May 27. Changes in long-range weather models from meteorological agencies, unexpected heat waves or cold fronts, and shifts in jet stream positioning can all alter trader expectations. Additionally, historical temperature anomalies, climate data releases, and real-time weather updates closer to the event date will influence odds. Traders should track UK weather forecasts and European weather systems that may impact London's temperature on that specific day.