Recent forecasts from models including GFS and local INMET guidance show a cold front advancing across São Paulo, driving widespread cloud cover, moderate to heavy rain, and advection of cooler maritime air that limits daytime heating on September 23. This setup favors a maximum temperature near 16–17 °C, with trader consensus split among the 15–18 °C outcomes reflecting small differences in model timing of peak rainfall and boundary-layer mixing. Persistent overcast conditions and evaporative cooling from precipitation further suppress the high relative to seasonal September averages, while any earlier clearing or lighter rain could allow brief warming toward 18 °C. Updated model runs and official briefings tomorrow morning will refine these thresholds ahead of market 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 Sao Paulo on September 23?
Highest temperature in Sao Paulo on September 23?
17°C 32%
16°C 28%
18°C 17%
15°C 13%
NEW
NEW
Sep 23, 2026
13°C or below
2%
14°C
5%
15°C
13%
16°C
28%
17°C
32%
18°C
17%
19°C
5%
20°C
2%
21°C
1%
22°C
<1%
23°C or higher
<1%
17°C 32%
16°C 28%
18°C 17%
15°C 13%
NEW
NEW
Sep 23, 2026
13°C or below
$111 Vol.
2%
14°C
$17 Vol.
5%
15°C
$496 Vol.
13%
16°C
$164 Vol.
28%
17°C
$251 Vol.
32%
18°C
$104 Vol.
17%
19°C
$144 Vol.
5%
20°C
$100 Vol.
2%
21°C
$371 Vol.
1%
22°C
$105 Vol.
<1%
23°C or higher
$105 Vol.
<1%
This market will resolve to the temperature range that contains the highest temperature recorded by NOAA at the Sao Paulo-Guarulhos International Airport Station in degrees Celsius on 23 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=sbgr
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.Recent forecasts from models including GFS and local INMET guidance show a cold front advancing across São Paulo, driving widespread cloud cover, moderate to heavy rain, and advection of cooler maritime air that limits daytime heating on September 23. This setup favors a maximum temperature near 16–17 °C, with trader consensus split among the 15–18 °C outcomes reflecting small differences in model timing of peak rainfall and boundary-layer mixing. Persistent overcast conditions and evaporative cooling from precipitation further suppress the high relative to seasonal September averages, while any earlier clearing or lighter rain could allow brief warming toward 18 °C. Updated model runs and official briefings tomorrow morning will refine these thresholds ahead of market resolution.
This market will resolve to the temperature range that contains the highest temperature recorded by NOAA at the Sao Paulo-Guarulhos International Airport Station in degrees Celsius on 23 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=sbgr
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=sbgr
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 21, 2026, 8:55 AM ET
Volume
$1,966End Date
Sep 23, 2026Market Opened
Sep 21, 2026, 8:55 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=sbgrResolver
0x69c47De9D...This market will resolve to the temperature range that contains the highest temperature recorded by NOAA at the Sao Paulo-Guarulhos International Airport Station in degrees Celsius on 23 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=sbgr
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.Recent forecasts from models including GFS and local INMET guidance show a cold front advancing across São Paulo, driving widespread cloud cover, moderate to heavy rain, and advection of cooler maritime air that limits daytime heating on September 23. This setup favors a maximum temperature near 16–17 °C, with trader consensus split among the 15–18 °C outcomes reflecting small differences in model timing of peak rainfall and boundary-layer mixing. Persistent overcast conditions and evaporative cooling from precipitation further suppress the high relative to seasonal September averages, while any earlier clearing or lighter rain could allow brief warming toward 18 °C. Updated model runs and official briefings tomorrow morning will refine these thresholds ahead of market resolution.
This market will resolve to the temperature range that contains the highest temperature recorded by NOAA at the Sao Paulo-Guarulhos International Airport Station in degrees Celsius on 23 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=sbgr
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=sbgr
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
$1,966End Date
Sep 23, 2026Market Opened
Sep 21, 2026, 8:55 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=sbgrResolver
0x69c47De9D...Recent forecasts from models including GFS and local INMET guidance show a cold front advancing across São Paulo, driving widespread cloud cover, moderate to heavy rain, and advection of cooler maritime air that limits daytime heating on September 23. This setup favors a maximum temperature near 16–17 °C, with trader consensus split among the 15–18 °C outcomes reflecting small differences in model timing of peak rainfall and boundary-layer mixing. Persistent overcast conditions and evaporative cooling from precipitation further suppress the high relative to seasonal September averages, while any earlier clearing or lighter rain could allow brief warming toward 18 °C. Updated model runs and official briefings tomorrow morning will refine these thresholds ahead of market 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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