Recent Met Office forecasts and supporting model runs position 21°C as the most probable maximum for London on September 17, driving the 59% market-implied probability. A front bringing overnight and morning rain is expected to clear southeastward by midday, yielding mostly cloudy conditions with sunny intervals, westerly winds around 10-13 mph, and afternoon highs reaching 20-21°C amid typical mid-September mildness. Consensus across sources shows limited upside risk above 22°C or downside below 19°C, though minor forecast adjustments from updated runs could still influence final 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 September 17?
Highest temperature in London on September 17?
21°C 60%
20°C 22%
22°C 16%
19°C 5%
NEW
$16,716 Vol.
NEW
$16,716 Vol.
Sep 17, 2026
15°C or below
<1%
16°C
<1%
17°C
<1%
18°C
1%
19°C
5%
20°C
22%
21°C
60%
22°C
16%
23°C
<1%
24°C
<1%
25°C or higher
<1%
21°C 60%
20°C 22%
22°C 16%
19°C 5%
NEW
$16,716 Vol.
NEW
$16,716 Vol.
Sep 17, 2026
15°C or below
$310 Vol.
<1%
16°C
$197 Vol.
<1%
17°C
$491 Vol.
<1%
18°C
$978 Vol.
1%
19°C
$2,317 Vol.
5%
20°C
$3,539 Vol.
22%
21°C
$5,283 Vol.
60%
22°C
$2,235 Vol.
16%
23°C
$645 Vol.
<1%
24°C
$574 Vol.
<1%
25°C or higher
$149 Vol.
<1%
This market will resolve to the temperature range that contains the highest temperature recorded by NOAA at the London City Airport Station in degrees Celsius on 17 Sep '26.
The resolution source for this market will be information from NOAA, specifically the highest reading under the "Temp" column for all times on this day, available here: https://www.weather.gov/wrh/timeseries?site=eglc
If NOAA data for the observation date is unavailable by 11:59 PM ET on the day following the observation date, the Weather Underground Daily Observations table will be used as the resolution source.
In the event that there is no data for the observation date by 11:59 PM ET on the day following the observation date, this market will resolve to the lowest bracket.
To toggle between Fahrenheit and Celsius, click the "Switch to Metric Units" button until the relevant table displays °C.
This market will resolve once the first data point for the following date has been published on the resolution source, or by 11:59 PM ET on the day following the observation date, whichever comes first.
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 forecasts and supporting model runs position 21°C as the most probable maximum for London on September 17, driving the 59% market-implied probability. A front bringing overnight and morning rain is expected to clear southeastward by midday, yielding mostly cloudy conditions with sunny intervals, westerly winds around 10-13 mph, and afternoon highs reaching 20-21°C amid typical mid-September mildness. Consensus across sources shows limited upside risk above 22°C or downside below 19°C, though minor forecast adjustments from updated runs could still influence final resolution.
This market will resolve to the temperature range that contains the highest temperature recorded by NOAA at the London City Airport Station in degrees Celsius on 17 Sep '26.
The resolution source for this market will be information from NOAA, specifically the highest reading under the "Temp" column for all times on this day, available here: https://www.weather.gov/wrh/timeseries?site=eglc
If NOAA data for the observation date is unavailable by 11:59 PM ET on the day following the observation date, the Weather Underground Daily Observations table will be used as the resolution source.
In the event that there is no data for the observation date by 11:59 PM ET on the day following the observation date, this market will resolve to the lowest bracket.
To toggle between Fahrenheit and Celsius, click the "Switch to Metric Units" button until the relevant table displays °C.
This market will resolve once the first data point for the following date has been published on the resolution source, or by 11:59 PM ET on the day following the observation date, whichever comes first.
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.
The resolution source for this market will be information from NOAA, specifically the highest reading under the "Temp" column for all times on this day, available here: https://www.weather.gov/wrh/timeseries?site=eglc
If NOAA data for the observation date is unavailable by 11:59 PM ET on the day following the observation date, the Weather Underground Daily Observations table will be used as the resolution source.
In the event that there is no data for the observation date by 11:59 PM ET on the day following the observation date, this market will resolve to the lowest bracket.
To toggle between Fahrenheit and Celsius, click the "Switch to Metric Units" button until the relevant table displays °C.
This market will resolve once the first data point for the following date has been published on the resolution source, or by 11:59 PM ET on the day following the observation date, whichever comes first.
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: Sep 15, 2026, 12:55 AM ET
Volume
$16,716End Date
Sep 17, 2026Market Opened
Sep 15, 2026, 12:55 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=eglcResolver
0x69c47De9D...This market will resolve to the temperature range that contains the highest temperature recorded by NOAA at the London City Airport Station in degrees Celsius on 17 Sep '26.
The resolution source for this market will be information from NOAA, specifically the highest reading under the "Temp" column for all times on this day, available here: https://www.weather.gov/wrh/timeseries?site=eglc
If NOAA data for the observation date is unavailable by 11:59 PM ET on the day following the observation date, the Weather Underground Daily Observations table will be used as the resolution source.
In the event that there is no data for the observation date by 11:59 PM ET on the day following the observation date, this market will resolve to the lowest bracket.
To toggle between Fahrenheit and Celsius, click the "Switch to Metric Units" button until the relevant table displays °C.
This market will resolve once the first data point for the following date has been published on the resolution source, or by 11:59 PM ET on the day following the observation date, whichever comes first.
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 forecasts and supporting model runs position 21°C as the most probable maximum for London on September 17, driving the 59% market-implied probability. A front bringing overnight and morning rain is expected to clear southeastward by midday, yielding mostly cloudy conditions with sunny intervals, westerly winds around 10-13 mph, and afternoon highs reaching 20-21°C amid typical mid-September mildness. Consensus across sources shows limited upside risk above 22°C or downside below 19°C, though minor forecast adjustments from updated runs could still influence final resolution.
This market will resolve to the temperature range that contains the highest temperature recorded by NOAA at the London City Airport Station in degrees Celsius on 17 Sep '26.
The resolution source for this market will be information from NOAA, specifically the highest reading under the "Temp" column for all times on this day, available here: https://www.weather.gov/wrh/timeseries?site=eglc
If NOAA data for the observation date is unavailable by 11:59 PM ET on the day following the observation date, the Weather Underground Daily Observations table will be used as the resolution source.
In the event that there is no data for the observation date by 11:59 PM ET on the day following the observation date, this market will resolve to the lowest bracket.
To toggle between Fahrenheit and Celsius, click the "Switch to Metric Units" button until the relevant table displays °C.
This market will resolve once the first data point for the following date has been published on the resolution source, or by 11:59 PM ET on the day following the observation date, whichever comes first.
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.
The resolution source for this market will be information from NOAA, specifically the highest reading under the "Temp" column for all times on this day, available here: https://www.weather.gov/wrh/timeseries?site=eglc
If NOAA data for the observation date is unavailable by 11:59 PM ET on the day following the observation date, the Weather Underground Daily Observations table will be used as the resolution source.
In the event that there is no data for the observation date by 11:59 PM ET on the day following the observation date, this market will resolve to the lowest bracket.
To toggle between Fahrenheit and Celsius, click the "Switch to Metric Units" button until the relevant table displays °C.
This market will resolve once the first data point for the following date has been published on the resolution source, or by 11:59 PM ET on the day following the observation date, whichever comes first.
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
$16,716End Date
Sep 17, 2026Market Opened
Sep 15, 2026, 12:55 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=eglcResolver
0x69c47De9D...Recent Met Office forecasts and supporting model runs position 21°C as the most probable maximum for London on September 17, driving the 59% market-implied probability. A front bringing overnight and morning rain is expected to clear southeastward by midday, yielding mostly cloudy conditions with sunny intervals, westerly winds around 10-13 mph, and afternoon highs reaching 20-21°C amid typical mid-September mildness. Consensus across sources shows limited upside risk above 22°C or downside below 19°C, though minor forecast adjustments from updated runs could still influence final resolution.
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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