Trader consensus assigns 100% implied probability to a 31°C high in São Paulo on April 4, 2026, driven by confirmed observational data from the official São Paulo-Guarulhos International Airport (GRU/SBGR) weather station, the market's resolution source via Wunderground historical records. INMET preliminary reports noted minimal precipitation (0.9 mm until 15h local time) under partly cloudy conditions, with final hourly surface observations peaking at 31°C amid a stable subtropical high-pressure ridge suppressing cloud development and allowing solar heating. This matched upper-end forecasts from INMET (up to 31°C) and CGE (around 28-29°C), shifting odds from 29°C (34% two days prior). Realistic challenges include rare data revisions from INMET quality control or sensor anomalies, though unlikely given cross-verification with aviation METARs.
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 4?
Highest temperature in Sao Paulo on April 4?
31°C 100.0%
25°C or below <1%
26°C <1%
27°C <1%
$99,503 Vol.
$99,503 Vol.
25°C or below
No
26°C
No
27°C
No
28°C
No
29°C
No
30°C
No
31°C
Yes
32°C
No
33°C
No
34°C
No
35°C or higher
No
31°C 100.0%
25°C or below <1%
26°C <1%
27°C <1%
$99,503 Vol.
$99,503 Vol.
25°C or below
No
26°C
No
27°C
No
28°C
No
29°C
No
30°C
No
31°C
Yes
32°C
No
33°C
No
34°C
No
35°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: Mar 29, 2026, 3:20 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
Trader consensus assigns 100% implied probability to a 31°C high in São Paulo on April 4, 2026, driven by confirmed observational data from the official São Paulo-Guarulhos International Airport (GRU/SBGR) weather station, the market's resolution source via Wunderground historical records. INMET preliminary reports noted minimal precipitation (0.9 mm until 15h local time) under partly cloudy conditions, with final hourly surface observations peaking at 31°C amid a stable subtropical high-pressure ridge suppressing cloud development and allowing solar heating. This matched upper-end forecasts from INMET (up to 31°C) and CGE (around 28-29°C), shifting odds from 29°C (34% two days prior). Realistic challenges include rare data revisions from INMET quality control or sensor anomalies, though unlikely given cross-verification with aviation METARs.
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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