Forecast models from sources like the Met Office and GFS place London's September 12 maximum near 23–24°C under southwest winds of 10–15 mph, partly cloudy skies, and surface pressures around 1022–1024 hPa that favor modest daytime warming. Afternoon insolation peaks with limited cloud interference before evening light rain arrives, while overnight lows near 14–18°C set a mild baseline. Historical September averages of roughly 20.5°C provide context for the above-normal reading, yet small timing differences in cloud build-up or boundary-layer mixing across ensemble runs sustain the near-even market split between 23°C and 24°C. Updated observations through the afternoon will refine the official maximum recorded at stations such as Heathrow.
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 12?
Highest temperature in London on September 12?
23°C 43%
24°C 43%
22°C 11%
25°C 6%
NEW
$26,359 Vol.
NEW
$26,359 Vol.
Sep 12, 2026
17°C or below
<1%
18°C
<1%
19°C
<1%
20°C
<1%
21°C
2%
22°C
11%
23°C
43%
24°C
43%
25°C
6%
26°C
2%
27°C or higher
<1%
23°C 43%
24°C 43%
22°C 11%
25°C 6%
NEW
$26,359 Vol.
NEW
$26,359 Vol.
Sep 12, 2026
17°C or below
$360 Vol.
<1%
18°C
$131 Vol.
<1%
19°C
$385 Vol.
<1%
20°C
$1,414 Vol.
<1%
21°C
$2,911 Vol.
2%
22°C
$3,271 Vol.
11%
23°C
$4,882 Vol.
43%
24°C
$6,429 Vol.
43%
25°C
$3,221 Vol.
6%
26°C
$2,018 Vol.
2%
27°C or higher
$1,336 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 12 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.Forecast models from sources like the Met Office and GFS place London's September 12 maximum near 23–24°C under southwest winds of 10–15 mph, partly cloudy skies, and surface pressures around 1022–1024 hPa that favor modest daytime warming. Afternoon insolation peaks with limited cloud interference before evening light rain arrives, while overnight lows near 14–18°C set a mild baseline. Historical September averages of roughly 20.5°C provide context for the above-normal reading, yet small timing differences in cloud build-up or boundary-layer mixing across ensemble runs sustain the near-even market split between 23°C and 24°C. Updated observations through the afternoon will refine the official maximum recorded at stations such as Heathrow.
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 12 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 10, 2026, 12:55 AM ET
Volume
$26,359End Date
Sep 12, 2026Market Opened
Sep 10, 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 12 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.Forecast models from sources like the Met Office and GFS place London's September 12 maximum near 23–24°C under southwest winds of 10–15 mph, partly cloudy skies, and surface pressures around 1022–1024 hPa that favor modest daytime warming. Afternoon insolation peaks with limited cloud interference before evening light rain arrives, while overnight lows near 14–18°C set a mild baseline. Historical September averages of roughly 20.5°C provide context for the above-normal reading, yet small timing differences in cloud build-up or boundary-layer mixing across ensemble runs sustain the near-even market split between 23°C and 24°C. Updated observations through the afternoon will refine the official maximum recorded at stations such as Heathrow.
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 12 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
$26,359End Date
Sep 12, 2026Market Opened
Sep 10, 2026, 12:55 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=eglcResolver
0x69c47De9D...Forecast models from sources like the Met Office and GFS place London's September 12 maximum near 23–24°C under southwest winds of 10–15 mph, partly cloudy skies, and surface pressures around 1022–1024 hPa that favor modest daytime warming. Afternoon insolation peaks with limited cloud interference before evening light rain arrives, while overnight lows near 14–18°C set a mild baseline. Historical September averages of roughly 20.5°C provide context for the above-normal reading, yet small timing differences in cloud build-up or boundary-layer mixing across ensemble runs sustain the near-even market split between 23°C and 24°C. Updated observations through the afternoon will refine the official maximum recorded at stations such as Heathrow.
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