Latest numerical weather prediction guidance from GFS and regional models indicates a high of 23–24 °C for Paris on 20 September under mostly cloudy skies, light westerly to northwesterly flow, and surface pressures near 1020 hPa. Persistent cloud cover is expected to limit daytime heating relative to clearer conditions the prior day, keeping values close to or slightly above the 1991–2020 climatological average of ~21 °C. Trader consensus between the 23 °C and 24 °C contracts reflects minor ensemble spread in boundary-layer mixing and exact cloud thickness, with lower-probability outcomes (22 °C or 25 °C) hinging on faster clearing or stronger insolation. Final resolution will rest on the official maximum recorded at the designated Paris station, with no precipitation or significant advection expected to alter the thermal profile.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedHighest temperature in Paris on September 20?
23°C 37%
24°C 35%
22°C 18%
25°C 13%
$31,319 Vol.
$31,319 Vol.
20°C or below
<1%
21°C
<1%
22°C
18%
23°C
37%
24°C
35%
25°C
13%
26°C
2%
27°C
<1%
28°C
<1%
29°C
<1%
30°C or higher
<1%
23°C 37%
24°C 35%
22°C 18%
25°C 13%
$31,319 Vol.
$31,319 Vol.
20°C or below
<1%
21°C
<1%
22°C
18%
23°C
37%
24°C
35%
25°C
13%
26°C
2%
27°C
<1%
28°C
<1%
29°C
<1%
30°C or higher
<1%
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=lfpb
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 18, 2026, 12:55 AM ET
Resolution Source
https://www.weather.gov/wrh/timeseries?site=lfpbResolver
0x69c47De9D...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=lfpb
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.
Resolution Source
https://www.weather.gov/wrh/timeseries?site=lfpbResolver
0x69c47De9D...Latest numerical weather prediction guidance from GFS and regional models indicates a high of 23–24 °C for Paris on 20 September under mostly cloudy skies, light westerly to northwesterly flow, and surface pressures near 1020 hPa. Persistent cloud cover is expected to limit daytime heating relative to clearer conditions the prior day, keeping values close to or slightly above the 1991–2020 climatological average of ~21 °C. Trader consensus between the 23 °C and 24 °C contracts reflects minor ensemble spread in boundary-layer mixing and exact cloud thickness, with lower-probability outcomes (22 °C or 25 °C) hinging on faster clearing or stronger insolation. Final resolution will rest on the official maximum recorded at the designated Paris station, with no precipitation or significant advection expected to alter the thermal profile.
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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