Current forecast models from sources including the European Centre for Medium-Range Weather Forecasts and GFS indicate a daily maximum of 21–24°C for Mexico City on September 18, driven by extensive cloud cover, light rain, and northeasterly flow typical of the late-summer rainy season at the city’s 2,240-meter elevation. These conditions limit daytime heating compared with clearer periods, aligning with historical September averages near 23–24°C while suppressing potential for readings at or above 25°C. Recent model consensus and observed trends over the past week support the market’s emphasis on 22–24°C outcomes, with uncertainty remaining around exact peak timing and any brief clearing that could allow modest warming. Updated runs from official monitoring agencies will refine resolution criteria ahead of the date.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedHighest temperature in Mexico City on September 18?
Highest temperature in Mexico City on September 18?
25°C or higher 46%
24°C 41%
23°C 40%
22°C 18%
NEW
NEW
Sep 18, 2026
15°C or below
4%
16°C
4%
17°C
3%
18°C
4%
19°C
4%
20°C
4%
21°C
9%
22°C
18%
23°C
40%
24°C
41%
25°C or higher
46%
25°C or higher 46%
24°C 41%
23°C 40%
22°C 18%
NEW
NEW
Sep 18, 2026
15°C or below
$0 Vol.
4%
16°C
$0 Vol.
4%
17°C
$0 Vol.
3%
18°C
$0 Vol.
4%
19°C
$0 Vol.
4%
20°C
$0 Vol.
4%
21°C
$0 Vol.
9%
22°C
$0 Vol.
18%
23°C
$0 Vol.
40%
24°C
$0 Vol.
41%
25°C or higher
$0 Vol.
46%
This market will resolve to the temperature range that contains the highest temperature recorded by NOAA at the Benito Juárez International Airport Station in degrees Celsius on 18 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=mmmx
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.Current forecast models from sources including the European Centre for Medium-Range Weather Forecasts and GFS indicate a daily maximum of 21–24°C for Mexico City on September 18, driven by extensive cloud cover, light rain, and northeasterly flow typical of the late-summer rainy season at the city’s 2,240-meter elevation. These conditions limit daytime heating compared with clearer periods, aligning with historical September averages near 23–24°C while suppressing potential for readings at or above 25°C. Recent model consensus and observed trends over the past week support the market’s emphasis on 22–24°C outcomes, with uncertainty remaining around exact peak timing and any brief clearing that could allow modest warming. Updated runs from official monitoring agencies will refine resolution criteria ahead of the date.
This market will resolve to the temperature range that contains the highest temperature recorded by NOAA at the Benito Juárez International Airport Station in degrees Celsius on 18 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=mmmx
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=mmmx
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 16, 2026, 8:56 AM ET
Volume
$0End Date
Sep 18, 2026Market Opened
Sep 16, 2026, 8:56 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=mmmxResolver
0x69c47De9D...This market will resolve to the temperature range that contains the highest temperature recorded by NOAA at the Benito Juárez International Airport Station in degrees Celsius on 18 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=mmmx
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.Current forecast models from sources including the European Centre for Medium-Range Weather Forecasts and GFS indicate a daily maximum of 21–24°C for Mexico City on September 18, driven by extensive cloud cover, light rain, and northeasterly flow typical of the late-summer rainy season at the city’s 2,240-meter elevation. These conditions limit daytime heating compared with clearer periods, aligning with historical September averages near 23–24°C while suppressing potential for readings at or above 25°C. Recent model consensus and observed trends over the past week support the market’s emphasis on 22–24°C outcomes, with uncertainty remaining around exact peak timing and any brief clearing that could allow modest warming. Updated runs from official monitoring agencies will refine resolution criteria ahead of the date.
This market will resolve to the temperature range that contains the highest temperature recorded by NOAA at the Benito Juárez International Airport Station in degrees Celsius on 18 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=mmmx
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=mmmx
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
$0End Date
Sep 18, 2026Market Opened
Sep 16, 2026, 8:56 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=mmmxResolver
0x69c47De9D...Current forecast models from sources including the European Centre for Medium-Range Weather Forecasts and GFS indicate a daily maximum of 21–24°C for Mexico City on September 18, driven by extensive cloud cover, light rain, and northeasterly flow typical of the late-summer rainy season at the city’s 2,240-meter elevation. These conditions limit daytime heating compared with clearer periods, aligning with historical September averages near 23–24°C while suppressing potential for readings at or above 25°C. Recent model consensus and observed trends over the past week support the market’s emphasis on 22–24°C outcomes, with uncertainty remaining around exact peak timing and any brief clearing that could allow modest warming. Updated runs from official monitoring agencies will refine resolution criteria ahead of the date.
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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