- Will the highest temperature in London be 17°C or below on August 21?<1¢
- Will the highest temperature in London be 18°C on August 21?2¢
- Will the highest temperature in London be 19°C on August 21?3¢
- Will the highest temperature in London be 20°C on August 21?12¢
- Will the highest temperature in London be 21°C on August 21?46¢
- Will the highest temperature in London be 22°C on August 21?36¢
- Will the highest temperature in London be 23°C on August 21?6¢
- Will the highest temperature in London be 24°C on August 21?2¢
- Will the highest temperature in London be 25°C on August 21?<1¢
- Will the highest temperature in London be 26°C on August 21?<1¢
- Will the highest temperature in London be 27°C or higher on August 21?<1¢
This market will resolve based on the highest 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 highest temperature recorded at the London City Airport Station in degrees Celsius on 21 Aug '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. 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.
Forecast models from the Met Office and others indicate a high of 21–22°C in London on August 21 under northerly winds and partly cloudy skies with low precipitation risk, consistent with the market's leading outcomes at 45.5% and 35.5%. This positioning reflects recent stabilization after variable mid-August conditions, with cooler air advection suppressing typical summer maxima near 23°C. Official resolution will hinge on verified station readings, where small shifts in cloud cover or wind could alter the peak by 1°C. Traders appear to weigh the tight clustering of ensemble guidance around these values against historical August variability.