Official observations from Brazil's National Institute of Meteorology (INMET) confirm São Paulo's highest temperature reached exactly 28.0°C on April 16, 2026, at the reference station, with a minimum of 16.6°C, 46% relative humidity, and no precipitation—driving trader consensus to 100% implied probability for this outcome on Polymarket. This aligns with São Paulo-Guarulhos International Airport data, the market's resolution source, amid a stable high-pressure system suppressing clouds and allowing daytime heating above April's climatological average high of 25–26°C on the Saffir-Simpson-influenced urban heat island. Realistic challenges would require discrepant final airport METAR readings or measurement revisions, though current data show strong alignment across monitoring networks.
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 April 16?
Highest temperature in Sao Paulo on April 16?
28°C 100.0%
23°C or below <1%
24°C <1%
25°C <1%
$71,123 Vol.
$71,123 Vol.
23°C or below
No
24°C
No
25°C
No
26°C
No
27°C
No
28°C
Yes
29°C
No
30°C
No
31°C
No
32°C
No
33°C or higher
No
28°C 100.0%
23°C or below <1%
24°C <1%
25°C <1%
$71,123 Vol.
$71,123 Vol.
23°C or below
No
24°C
No
25°C
No
26°C
No
27°C
No
28°C
Yes
29°C
No
30°C
No
31°C
No
32°C
No
33°C or higher
No
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day by the Forecast for the Sao Paulo-Guarulhos International Airport Station once information is finalized, available here: https://www.wunderground.com/history/daily/br/guarulhos/SBGR.
To toggle between Fahrenheit and Celsius, click the gear icon next to the search bar and switch the Temperature setting between °F and °C.
This market can not resolve to "Yes" until all data for this date has been finalized.
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.
Any revisions to temperatures recorded after data is finalized for this market's timeframe will not be considered for this market's resolution.
Market Opened: Apr 14, 2026, 6:05 PM ET
Resolution Source
https://www.wunderground.com/history/daily/br/guarulhos/SBGRResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day by the Forecast for the Sao Paulo-Guarulhos International Airport Station once information is finalized, available here: https://www.wunderground.com/history/daily/br/guarulhos/SBGR.
To toggle between Fahrenheit and Celsius, click the gear icon next to the search bar and switch the Temperature setting between °F and °C.
This market can not resolve to "Yes" until all data for this date has been finalized.
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.
Any revisions to temperatures recorded after data is finalized for this market's timeframe will not be considered for this market's resolution.
Resolution Source
https://www.wunderground.com/history/daily/br/guarulhos/SBGRResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
Official observations from Brazil's National Institute of Meteorology (INMET) confirm São Paulo's highest temperature reached exactly 28.0°C on April 16, 2026, at the reference station, with a minimum of 16.6°C, 46% relative humidity, and no precipitation—driving trader consensus to 100% implied probability for this outcome on Polymarket. This aligns with São Paulo-Guarulhos International Airport data, the market's resolution source, amid a stable high-pressure system suppressing clouds and allowing daytime heating above April's climatological average high of 25–26°C on the Saffir-Simpson-influenced urban heat island. Realistic challenges would require discrepant final airport METAR readings or measurement revisions, though current data show strong alignment across monitoring networks.
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