Recent Met Office and ECMWF ensemble forecasts center London’s August 21 maximum near 21–22°C under light westerly flow, variable cloud, and limited showers following the earlier summer heatwave. These models show modest uncertainty in afternoon solar heating and any passing rain bands, which can shift the peak by roughly 1°C. Historical August averages hover around 22°C, but post-heatwave Atlantic influences favor near-normal readings without strong high pressure. Trader consensus splits closely between 21°C and 22°C because small differences in cloud timing or wind direction determine whether the thermometer tops out at one value or the next, while higher or lower extremes remain unlikely given the stable pattern.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedHighest temperature in London on August 21?
Highest temperature in London on August 21?
21°C 40%
22°C 35%
20°C 15%
23°C 12%
NEW
$59,826 Vol.
NEW
$59,826 Vol.
Aug 21, 2026
17°C or below
<1%
18°C
<1%
19°C
<1%
20°C
15%
21°C
40%
22°C
35%
23°C
12%
24°C
3%
25°C
<1%
26°C
<1%
27°C or higher
<1%
21°C 40%
22°C 35%
20°C 15%
23°C 12%
NEW
$59,826 Vol.
NEW
$59,826 Vol.
Aug 21, 2026
17°C or below
$6,698 Vol.
<1%
18°C
$3,866 Vol.
<1%
19°C
$5,784 Vol.
<1%
20°C
$5,197 Vol.
15%
21°C
$5,619 Vol.
40%
22°C
$7,943 Vol.
35%
23°C
$6,617 Vol.
12%
24°C
$10,694 Vol.
3%
25°C
$2,332 Vol.
<1%
26°C
$2,352 Vol.
<1%
27°C or higher
$2,726 Vol.
<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.Recent Met Office and ECMWF ensemble forecasts center London’s August 21 maximum near 21–22°C under light westerly flow, variable cloud, and limited showers following the earlier summer heatwave. These models show modest uncertainty in afternoon solar heating and any passing rain bands, which can shift the peak by roughly 1°C. Historical August averages hover around 22°C, but post-heatwave Atlantic influences favor near-normal readings without strong high pressure. Trader consensus splits closely between 21°C and 22°C because small differences in cloud timing or wind direction determine whether the thermometer tops out at one value or the next, while higher or lower extremes remain unlikely given the stable pattern.
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.
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.
Market Opened: Aug 19, 2026, 12:55 AM ET
Volume
$59,826End Date
Aug 21, 2026Market Opened
Aug 19, 2026, 12:55 AM ETResolution Source
https://www.wunderground.com/history/daily/gb/london/EGLCResolver
0x69c47De9D...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.Recent Met Office and ECMWF ensemble forecasts center London’s August 21 maximum near 21–22°C under light westerly flow, variable cloud, and limited showers following the earlier summer heatwave. These models show modest uncertainty in afternoon solar heating and any passing rain bands, which can shift the peak by roughly 1°C. Historical August averages hover around 22°C, but post-heatwave Atlantic influences favor near-normal readings without strong high pressure. Trader consensus splits closely between 21°C and 22°C because small differences in cloud timing or wind direction determine whether the thermometer tops out at one value or the next, while higher or lower extremes remain unlikely given the stable pattern.
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.
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.
Volume
$59,826End Date
Aug 21, 2026Market Opened
Aug 19, 2026, 12:55 AM ETResolution Source
https://www.wunderground.com/history/daily/gb/london/EGLCResolver
0x69c47De9D...Recent Met Office and ECMWF ensemble forecasts center London’s August 21 maximum near 21–22°C under light westerly flow, variable cloud, and limited showers following the earlier summer heatwave. These models show modest uncertainty in afternoon solar heating and any passing rain bands, which can shift the peak by roughly 1°C. Historical August averages hover around 22°C, but post-heatwave Atlantic influences favor near-normal readings without strong high pressure. Trader consensus splits closely between 21°C and 22°C because small differences in cloud timing or wind direction determine whether the thermometer tops out at one value or the next, while higher or lower extremes remain unlikely given the stable pattern.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · Updated
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