Official forecasts from the UK Met Office and supporting models indicate a daytime maximum near 20°C for London on September 17, driven by a westerly flow bringing milder Atlantic air after recent rain clearance. Expect mostly cloudy skies with isolated light showers possible, limiting strong solar heating and keeping afternoon peaks in the 19–21°C range. Ensemble guidance shows limited spread around this value, though exact timing of any cloud breaks or wind shifts could nudge the observed high by 1°C in either direction. Historical September averages near 19–20°C provide context, with traders weighting the consensus toward the tightly matched 20°C and 21°C outcomes amid typical short-range forecast uncertainty. Updated model runs and Met Office briefings over the next 48 hours will likely refine probabilities 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 September 17?
Highest temperature in London on September 17?
20°C 45%
21°C 40%
19°C 12%
22°C 8%
NEW
NEW
Sep 17, 2026
15°C or below
<1%
16°C
3%
17°C
6%
18°C
6%
19°C
12%
20°C
45%
21°C
40%
22°C
8%
23°C
3%
24°C
1%
25°C or higher
<1%
20°C 45%
21°C 40%
19°C 12%
22°C 8%
NEW
NEW
Sep 17, 2026
15°C or below
$117 Vol.
<1%
16°C
$0 Vol.
3%
17°C
$0 Vol.
6%
18°C
$54 Vol.
6%
19°C
$58 Vol.
12%
20°C
$252 Vol.
45%
21°C
$19 Vol.
40%
22°C
$127 Vol.
8%
23°C
$0 Vol.
3%
24°C
$57 Vol.
1%
25°C or higher
$111 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.Official forecasts from the UK Met Office and supporting models indicate a daytime maximum near 20°C for London on September 17, driven by a westerly flow bringing milder Atlantic air after recent rain clearance. Expect mostly cloudy skies with isolated light showers possible, limiting strong solar heating and keeping afternoon peaks in the 19–21°C range. Ensemble guidance shows limited spread around this value, though exact timing of any cloud breaks or wind shifts could nudge the observed high by 1°C in either direction. Historical September averages near 19–20°C provide context, with traders weighting the consensus toward the tightly matched 20°C and 21°C outcomes amid typical short-range forecast uncertainty. Updated model runs and Met Office briefings over the next 48 hours will likely refine probabilities before 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
$795End 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.Official forecasts from the UK Met Office and supporting models indicate a daytime maximum near 20°C for London on September 17, driven by a westerly flow bringing milder Atlantic air after recent rain clearance. Expect mostly cloudy skies with isolated light showers possible, limiting strong solar heating and keeping afternoon peaks in the 19–21°C range. Ensemble guidance shows limited spread around this value, though exact timing of any cloud breaks or wind shifts could nudge the observed high by 1°C in either direction. Historical September averages near 19–20°C provide context, with traders weighting the consensus toward the tightly matched 20°C and 21°C outcomes amid typical short-range forecast uncertainty. Updated model runs and Met Office briefings over the next 48 hours will likely refine probabilities before 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
$795End Date
Sep 17, 2026Market Opened
Sep 15, 2026, 12:55 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=eglcResolver
0x69c47De9D...Official forecasts from the UK Met Office and supporting models indicate a daytime maximum near 20°C for London on September 17, driven by a westerly flow bringing milder Atlantic air after recent rain clearance. Expect mostly cloudy skies with isolated light showers possible, limiting strong solar heating and keeping afternoon peaks in the 19–21°C range. Ensemble guidance shows limited spread around this value, though exact timing of any cloud breaks or wind shifts could nudge the observed high by 1°C in either direction. Historical September averages near 19–20°C provide context, with traders weighting the consensus toward the tightly matched 20°C and 21°C outcomes amid typical short-range forecast uncertainty. Updated model runs and Met Office briefings over the next 48 hours will likely refine probabilities before 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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