**Forecast models for São Paulo on September 16, 2026, show highs clustered around 18–20°C, with trader consensus split between 19°C and 20°C reflecting model disagreement on afternoon clearing.** Recent cold front passage has left the region under building high pressure with southeasterly flow, maintaining above-average cloud cover and light showers that limit insolation. Official guidance from sources such as INMET-aligned runs and global ensembles (ECMWF, GFS) indicates peak temperatures will depend on the timing and extent of any break in the stratiform clouds versus continued marine influence. Historical September maxima average near 23–25°C, so current conditions represent a notably cooler regime. Resolution hinges on the official daily maximum recorded at the primary station, where even small shifts in boundary-layer mixing or residual moisture could separate the 18°C, 19°C, and 20°C outcomes. Updated model runs and afternoon observations over the next 24 hours will likely tighten the distribution.
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 16?
Highest temperature in Sao Paulo on September 16?
19°C 31%
20°C 29%
18°C 20%
21°C 12%
NEW
NEW
Sep 16, 2026
14°C or below
1%
15°C
2%
16°C
3%
17°C
4%
18°C
20%
19°C
31%
20°C
29%
21°C
12%
22°C
8%
23°C
1%
24°C or higher
1%
19°C 31%
20°C 29%
18°C 20%
21°C 12%
NEW
NEW
Sep 16, 2026
14°C or below
$80 Vol.
1%
15°C
$36 Vol.
2%
16°C
$0 Vol.
3%
17°C
$280 Vol.
4%
18°C
$399 Vol.
20%
19°C
$490 Vol.
31%
20°C
$414 Vol.
29%
21°C
$105 Vol.
12%
22°C
$9 Vol.
8%
23°C
$208 Vol.
1%
24°C or higher
$187 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 16 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.**Forecast models for São Paulo on September 16, 2026, show highs clustered around 18–20°C, with trader consensus split between 19°C and 20°C reflecting model disagreement on afternoon clearing.**
Recent cold front passage has left the region under building high pressure with southeasterly flow, maintaining above-average cloud cover and light showers that limit insolation. Official guidance from sources such as INMET-aligned runs and global ensembles (ECMWF, GFS) indicates peak temperatures will depend on the timing and extent of any break in the stratiform clouds versus continued marine influence. Historical September maxima average near 23–25°C, so current conditions represent a notably cooler regime. Resolution hinges on the official daily maximum recorded at the primary station, where even small shifts in boundary-layer mixing or residual moisture could separate the 18°C, 19°C, and 20°C outcomes. Updated model runs and afternoon observations over the next 24 hours will likely tighten the distribution.
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 16 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 14, 2026, 8:55 AM ET
Volume
$2,208End Date
Sep 16, 2026Market Opened
Sep 14, 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 16 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.**Forecast models for São Paulo on September 16, 2026, show highs clustered around 18–20°C, with trader consensus split between 19°C and 20°C reflecting model disagreement on afternoon clearing.**
Recent cold front passage has left the region under building high pressure with southeasterly flow, maintaining above-average cloud cover and light showers that limit insolation. Official guidance from sources such as INMET-aligned runs and global ensembles (ECMWF, GFS) indicates peak temperatures will depend on the timing and extent of any break in the stratiform clouds versus continued marine influence. Historical September maxima average near 23–25°C, so current conditions represent a notably cooler regime. Resolution hinges on the official daily maximum recorded at the primary station, where even small shifts in boundary-layer mixing or residual moisture could separate the 18°C, 19°C, and 20°C outcomes. Updated model runs and afternoon observations over the next 24 hours will likely tighten the distribution.
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 16 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
$2,208End Date
Sep 16, 2026Market Opened
Sep 14, 2026, 8:55 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=sbgrResolver
0x69c47De9D...**Forecast models for São Paulo on September 16, 2026, show highs clustered around 18–20°C, with trader consensus split between 19°C and 20°C reflecting model disagreement on afternoon clearing.** Recent cold front passage has left the region under building high pressure with southeasterly flow, maintaining above-average cloud cover and light showers that limit insolation. Official guidance from sources such as INMET-aligned runs and global ensembles (ECMWF, GFS) indicates peak temperatures will depend on the timing and extent of any break in the stratiform clouds versus continued marine influence. Historical September maxima average near 23–25°C, so current conditions represent a notably cooler regime. Resolution hinges on the official daily maximum recorded at the primary station, where even small shifts in boundary-layer mixing or residual moisture could separate the 18°C, 19°C, and 20°C outcomes. Updated model runs and afternoon observations over the next 24 hours will likely tighten the distribution.
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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