Forecast models from sources including the European Centre for Medium-Range Weather Forecasts and local meteorological services indicate a likely overnight low near 12–14 °C for Mexico City on September 21, driven by the city’s 2,240 m elevation, clear to partly cloudy skies, light northerly winds, and moderate humidity that permits efficient radiative cooling after sunset. Trader sentiment remains nearly balanced between the 17 °C-or-higher and sub-7 °C outcomes because ensemble spreads show sensitivity to small shifts in cloud cover, dew-point depression, and any late-evening showers that could raise or lower the minimum by 1–2 °C. Historical September averages place the typical low around 13 °C, so resolution hinges on the final 00:00–06:00 local-time observations once the diurnal minimum is reached.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedLowest temperature in Mexico City on September 21?
Lowest temperature in Mexico City on September 21?
17°C or higher 100%
7°C or below 98%
12°C 98%
13°C 98%
NEW
NEW
Sep 21, 2026
7°C or below
98%
8°C
13%
9°C
13%
10°C
13%
11°C
39%
12°C
98%
13°C
98%
14°C
22%
15°C
40%
16°C
98%
17°C or higher
100%
17°C or higher 100%
7°C or below 98%
12°C 98%
13°C 98%
NEW
NEW
Sep 21, 2026
7°C or below
$0 Vol.
98%
8°C
$0 Vol.
13%
9°C
$0 Vol.
13%
10°C
$0 Vol.
13%
11°C
$0 Vol.
39%
12°C
$0 Vol.
98%
13°C
$0 Vol.
98%
14°C
$0 Vol.
22%
15°C
$0 Vol.
40%
16°C
$0 Vol.
98%
17°C or higher
$0 Vol.
100%
This market will resolve to the temperature range that contains the lowest temperature recorded by NOAA at the Benito Juárez International Airport Station in degrees Celsius on 21 Sep '26.
The resolution source for this market will be information from NOAA, specifically the lowest 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.Forecast models from sources including the European Centre for Medium-Range Weather Forecasts and local meteorological services indicate a likely overnight low near 12–14 °C for Mexico City on September 21, driven by the city’s 2,240 m elevation, clear to partly cloudy skies, light northerly winds, and moderate humidity that permits efficient radiative cooling after sunset. Trader sentiment remains nearly balanced between the 17 °C-or-higher and sub-7 °C outcomes because ensemble spreads show sensitivity to small shifts in cloud cover, dew-point depression, and any late-evening showers that could raise or lower the minimum by 1–2 °C. Historical September averages place the typical low around 13 °C, so resolution hinges on the final 00:00–06:00 local-time observations once the diurnal minimum is reached.
This market will resolve to the temperature range that contains the lowest temperature recorded by NOAA at the Benito Juárez International Airport Station in degrees Celsius on 21 Sep '26.
The resolution source for this market will be information from NOAA, specifically the lowest 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 lowest 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 19, 2026, 8:29 AM ET
Volume
$0End Date
Sep 21, 2026Market Opened
Sep 19, 2026, 8:29 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=mmmxResolver
0x69c47De9D...This market will resolve to the temperature range that contains the lowest temperature recorded by NOAA at the Benito Juárez International Airport Station in degrees Celsius on 21 Sep '26.
The resolution source for this market will be information from NOAA, specifically the lowest 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.Forecast models from sources including the European Centre for Medium-Range Weather Forecasts and local meteorological services indicate a likely overnight low near 12–14 °C for Mexico City on September 21, driven by the city’s 2,240 m elevation, clear to partly cloudy skies, light northerly winds, and moderate humidity that permits efficient radiative cooling after sunset. Trader sentiment remains nearly balanced between the 17 °C-or-higher and sub-7 °C outcomes because ensemble spreads show sensitivity to small shifts in cloud cover, dew-point depression, and any late-evening showers that could raise or lower the minimum by 1–2 °C. Historical September averages place the typical low around 13 °C, so resolution hinges on the final 00:00–06:00 local-time observations once the diurnal minimum is reached.
This market will resolve to the temperature range that contains the lowest temperature recorded by NOAA at the Benito Juárez International Airport Station in degrees Celsius on 21 Sep '26.
The resolution source for this market will be information from NOAA, specifically the lowest 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 lowest 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 21, 2026Market Opened
Sep 19, 2026, 8:29 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=mmmxResolver
0x69c47De9D...Forecast models from sources including the European Centre for Medium-Range Weather Forecasts and local meteorological services indicate a likely overnight low near 12–14 °C for Mexico City on September 21, driven by the city’s 2,240 m elevation, clear to partly cloudy skies, light northerly winds, and moderate humidity that permits efficient radiative cooling after sunset. Trader sentiment remains nearly balanced between the 17 °C-or-higher and sub-7 °C outcomes because ensemble spreads show sensitivity to small shifts in cloud cover, dew-point depression, and any late-evening showers that could raise or lower the minimum by 1–2 °C. Historical September averages place the typical low around 13 °C, so resolution hinges on the final 00:00–06:00 local-time observations once the diurnal minimum is reached.
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