This market will resolve based on the lowest temperature recorded in the 'Daily Observations' table on Weather Underground, not the figure displayed in the 'Day High & Low' summary section; in the event of any discrepancy between the two, the Daily Observations table shall be the primary resolution source not the Day High & Low section. This market will resolve to the temperature range that contains the lowest temperature recorded at the London City Airport Station in degrees Celsius on 15 Aug '26. The resolution source for this market will be information from Wunderground, specifically the lowest 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. Revisions to temperatures recorded within this market's timeframe will be considered until the first datapoint for the following date has been published, after which any alterations will not be considered.
Recent model consensus from the Met Office and ECMWF points to a mild overnight minimum near 19–21°C in London on August 15 as high pressure yields to a cooler northwesterly airflow, moderating the recent heatwave that peaked above 30°C on August 14. This shift aligns with seasonal norms for mid-August, where clear skies and light winds allow radiative cooling but prevent sharp drops, keeping temperatures well above the long-term average low of around 14°C. Trader sentiment clusters around 20°C as the implied most likely outcome because ensemble runs show limited variability in boundary-layer temperatures overnight, with only modest risks of localized cloud or showers altering the reading. Upcoming short-range updates from official agencies will refine these probabilities ahead of resolution.