Official Met Office forecasts for London on August 19 indicate a maximum of 23–24 °C under sunny intervals with scattered showers, establishing the market-implied 25 °C outcome through close alignment with observed model consensus and historical August baselines near 22 °C. This positioning reflects aggregated trader assessment of stable westerly flow and limited diurnal heating potential, consistent with recent cooling after the mid-August heatwave. A realistic challenge would require unexpected prolonged clear skies or a sharp ridge strengthening that pushes readings above the forecast envelope, though current guidance shows low probability of such deviation before resolution.
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 19?
Highest temperature in London on August 19?
25°C 100.0%
20°C or below <1%
21°C <1%
22°C <1%
$158,472 Vol.
$158,472 Vol.
Aug 19, 2026
20°C or below
No
21°C
No
22°C
No
23°C
No
24°C
No
25°C
Yes
26°C
No
27°C
No
28°C
No
29°C
No
30°C or higher
No
25°C 100.0%
20°C or below <1%
21°C <1%
22°C <1%
$158,472 Vol.
$158,472 Vol.
Aug 19, 2026
20°C or below
$15,490 Vol.
No
21°C
$12,314 Vol.
No
22°C
$10,023 Vol.
No
23°C
$21,584 Vol.
No
24°C
$30,312 Vol.
No
25°C
$30,441 Vol.
Yes
26°C
$26,986 Vol.
No
27°C
$7,631 Vol.
No
28°C
$615 Vol.
No
29°C
$1,726 Vol.
No
30°C or higher
$1,350 Vol.
No
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 19 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.Official Met Office forecasts for London on August 19 indicate a maximum of 23–24 °C under sunny intervals with scattered showers, establishing the market-implied 25 °C outcome through close alignment with observed model consensus and historical August baselines near 22 °C. This positioning reflects aggregated trader assessment of stable westerly flow and limited diurnal heating potential, consistent with recent cooling after the mid-August heatwave. A realistic challenge would require unexpected prolonged clear skies or a sharp ridge strengthening that pushes readings above the forecast envelope, though current guidance shows low probability of such deviation before resolution.
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 19 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 19 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 17, 2026, 12:55 AM ET
Volume
$158,472End Date
Aug 19, 2026Market Opened
Aug 17, 2026, 12:55 AM ETResolution Source
https://www.wunderground.com/history/daily/gb/london/EGLCResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
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 19 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.Official Met Office forecasts for London on August 19 indicate a maximum of 23–24 °C under sunny intervals with scattered showers, establishing the market-implied 25 °C outcome through close alignment with observed model consensus and historical August baselines near 22 °C. This positioning reflects aggregated trader assessment of stable westerly flow and limited diurnal heating potential, consistent with recent cooling after the mid-August heatwave. A realistic challenge would require unexpected prolonged clear skies or a sharp ridge strengthening that pushes readings above the forecast envelope, though current guidance shows low probability of such deviation before resolution.
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 19 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 19 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
$158,472End Date
Aug 19, 2026Market Opened
Aug 17, 2026, 12:55 AM ETResolution Source
https://www.wunderground.com/history/daily/gb/london/EGLCResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
Official Met Office forecasts for London on August 19 indicate a maximum of 23–24 °C under sunny intervals with scattered showers, establishing the market-implied 25 °C outcome through close alignment with observed model consensus and historical August baselines near 22 °C. This positioning reflects aggregated trader assessment of stable westerly flow and limited diurnal heating potential, consistent with recent cooling after the mid-August heatwave. A realistic challenge would require unexpected prolonged clear skies or a sharp ridge strengthening that pushes readings above the forecast envelope, though current guidance shows low probability of such deviation before resolution.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · Updated
Beware of external links.
Beware of external links.
Frequently Asked Questions