Persistent cold front activity and widespread rain across São Paulo on September 13 are suppressing daytime heating while promoting radiative cooling overnight under cloudy skies and southeasterly flow. Official guidance from INMET and local agencies shows minimum temperatures likely falling in the 13–15°C range, with model spreads reflecting uncertainty in rainfall timing, intensity, and boundary-layer moisture that can shift overnight lows by 1–2°C. High humidity near 95% and light winds limit further cooling, consistent with September climatology where minima average near 12°C but recent instability has kept readings elevated. Traders weigh the latest model runs against real-time observations, as any break in cloud cover or heavier showers could tip resolution between the closely matched 13°C, 14°C, and 15°C outcomes.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedLowest temperature in Sao Paulo on September 13?
Lowest temperature in Sao Paulo on September 13?
10°C or below 96%
15°C 52%
13°C 51%
14°C 49%
NEW
NEW
Sep 13, 2026
10°C or below
96%
11°C
9%
12°C
9%
13°C
51%
14°C
49%
15°C
52%
16°C
<1%
17°C
<1%
18°C
<1%
19°C
<1%
20°C or higher
<1%
10°C or below 96%
15°C 52%
13°C 51%
14°C 49%
NEW
NEW
Sep 13, 2026
10°C or below
$0 Vol.
96%
11°C
$0 Vol.
9%
12°C
$0 Vol.
9%
13°C
$5 Vol.
51%
14°C
$6 Vol.
49%
15°C
$0 Vol.
52%
16°C
$296 Vol.
<1%
17°C
$15 Vol.
<1%
18°C
$15 Vol.
<1%
19°C
$15 Vol.
<1%
20°C or higher
$15 Vol.
<1%
This market will resolve to the temperature range that contains the lowest temperature recorded by NOAA at the Sao Paulo-Guarulhos International Airport Station in degrees Celsius on 13 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=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.Persistent cold front activity and widespread rain across São Paulo on September 13 are suppressing daytime heating while promoting radiative cooling overnight under cloudy skies and southeasterly flow. Official guidance from INMET and local agencies shows minimum temperatures likely falling in the 13–15°C range, with model spreads reflecting uncertainty in rainfall timing, intensity, and boundary-layer moisture that can shift overnight lows by 1–2°C. High humidity near 95% and light winds limit further cooling, consistent with September climatology where minima average near 12°C but recent instability has kept readings elevated. Traders weigh the latest model runs against real-time observations, as any break in cloud cover or heavier showers could tip resolution between the closely matched 13°C, 14°C, and 15°C outcomes.
This market will resolve to the temperature range that contains the lowest temperature recorded by NOAA at the Sao Paulo-Guarulhos International Airport Station in degrees Celsius on 13 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=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 lowest 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 11, 2026, 8:29 AM ET
Volume
$367End Date
Sep 13, 2026Market Opened
Sep 11, 2026, 8:29 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=sbgrResolver
0x69c47De9D...This market will resolve to the temperature range that contains the lowest temperature recorded by NOAA at the Sao Paulo-Guarulhos International Airport Station in degrees Celsius on 13 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=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.Persistent cold front activity and widespread rain across São Paulo on September 13 are suppressing daytime heating while promoting radiative cooling overnight under cloudy skies and southeasterly flow. Official guidance from INMET and local agencies shows minimum temperatures likely falling in the 13–15°C range, with model spreads reflecting uncertainty in rainfall timing, intensity, and boundary-layer moisture that can shift overnight lows by 1–2°C. High humidity near 95% and light winds limit further cooling, consistent with September climatology where minima average near 12°C but recent instability has kept readings elevated. Traders weigh the latest model runs against real-time observations, as any break in cloud cover or heavier showers could tip resolution between the closely matched 13°C, 14°C, and 15°C outcomes.
This market will resolve to the temperature range that contains the lowest temperature recorded by NOAA at the Sao Paulo-Guarulhos International Airport Station in degrees Celsius on 13 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=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 lowest 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
$367End Date
Sep 13, 2026Market Opened
Sep 11, 2026, 8:29 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=sbgrResolver
0x69c47De9D...Persistent cold front activity and widespread rain across São Paulo on September 13 are suppressing daytime heating while promoting radiative cooling overnight under cloudy skies and southeasterly flow. Official guidance from INMET and local agencies shows minimum temperatures likely falling in the 13–15°C range, with model spreads reflecting uncertainty in rainfall timing, intensity, and boundary-layer moisture that can shift overnight lows by 1–2°C. High humidity near 95% and light winds limit further cooling, consistent with September climatology where minima average near 12°C but recent instability has kept readings elevated. Traders weigh the latest model runs against real-time observations, as any break in cloud cover or heavier showers could tip resolution between the closely matched 13°C, 14°C, and 15°C outcomes.
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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