Recent frontal passage and associated heavy rainfall through September 10 have cleared much of the cloud cover over São Paulo, setting up warmer conditions for the 11th under partly cloudy skies and northerly flow. Official model guidance, including runs from ECMWF and GFS ensembles, points to daytime maxima clustering near 27–29 °C as solar insolation increases and dew points remain moderate; subtle differences in cloud timing, boundary-layer mixing, and exact wind direction create the narrow spread between these outcomes. Historical September averages near 23 °C underscore the anomalous warmth, yet lingering moisture and possible afternoon showers introduce modest downside risk to the daily high. Updated model runs and local observations over the next 48 hours will refine the peak temperature 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 11?
Highest temperature in Sao Paulo on September 11?
28°C 31%
29°C 29%
27°C 19%
26°C 9%
NEW
NEW
Sep 11, 2026
25°C or below
6%
26°C
9%
27°C
19%
28°C
31%
29°C
29%
30°C
9%
31°C
3%
32°C
3%
33°C
3%
34°C
<1%
35°C or higher
<1%
28°C 31%
29°C 29%
27°C 19%
26°C 9%
NEW
NEW
Sep 11, 2026
25°C or below
$246 Vol.
6%
26°C
$29 Vol.
9%
27°C
$73 Vol.
19%
28°C
$32 Vol.
31%
29°C
$290 Vol.
29%
30°C
$39 Vol.
9%
31°C
$20 Vol.
3%
32°C
$0 Vol.
3%
33°C
$0 Vol.
3%
34°C
$25 Vol.
<1%
35°C or higher
$25 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 11 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 frontal passage and associated heavy rainfall through September 10 have cleared much of the cloud cover over São Paulo, setting up warmer conditions for the 11th under partly cloudy skies and northerly flow. Official model guidance, including runs from ECMWF and GFS ensembles, points to daytime maxima clustering near 27–29 °C as solar insolation increases and dew points remain moderate; subtle differences in cloud timing, boundary-layer mixing, and exact wind direction create the narrow spread between these outcomes. Historical September averages near 23 °C underscore the anomalous warmth, yet lingering moisture and possible afternoon showers introduce modest downside risk to the daily high. Updated model runs and local observations over the next 48 hours will refine the peak temperature 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 11 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 9, 2026, 8:55 AM ET
Volume
$780End Date
Sep 11, 2026Market Opened
Sep 9, 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 11 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 frontal passage and associated heavy rainfall through September 10 have cleared much of the cloud cover over São Paulo, setting up warmer conditions for the 11th under partly cloudy skies and northerly flow. Official model guidance, including runs from ECMWF and GFS ensembles, points to daytime maxima clustering near 27–29 °C as solar insolation increases and dew points remain moderate; subtle differences in cloud timing, boundary-layer mixing, and exact wind direction create the narrow spread between these outcomes. Historical September averages near 23 °C underscore the anomalous warmth, yet lingering moisture and possible afternoon showers introduce modest downside risk to the daily high. Updated model runs and local observations over the next 48 hours will refine the peak temperature 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 11 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
$780End Date
Sep 11, 2026Market Opened
Sep 9, 2026, 8:55 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=sbgrResolver
0x69c47De9D...Recent frontal passage and associated heavy rainfall through September 10 have cleared much of the cloud cover over São Paulo, setting up warmer conditions for the 11th under partly cloudy skies and northerly flow. Official model guidance, including runs from ECMWF and GFS ensembles, points to daytime maxima clustering near 27–29 °C as solar insolation increases and dew points remain moderate; subtle differences in cloud timing, boundary-layer mixing, and exact wind direction create the narrow spread between these outcomes. Historical September averages near 23 °C underscore the anomalous warmth, yet lingering moisture and possible afternoon showers introduce modest downside risk to the daily high. Updated model runs and local observations over the next 48 hours will refine the peak temperature 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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