Trader consensus on Polymarket has locked in a 100% implied probability for a highest temperature of exactly 30°C in Sao Paulo on March 25, driven by official observations from Brazil's National Institute of Meteorology (INMET) confirming this precise peak reading at key weather stations like Congonhas and Mirante de Santana. Mild autumn conditions prevailed, with partly cloudy skies, light southerly winds, and no significant heat advection, aligning with pre-event forecast model consensus from GFS and ECMWF that projected highs in the upper 20s to low 30s Celsius. Historical March averages for Sao Paulo hover around 27–29°C, making 30°C a plausible but unremarkable outcome. Realistic challenges would require rare post hoc data revisions from INMET audits or disputes over measurement site validity, though such events are exceedingly uncommon for settled daily records.
Experimental AI-generated summary referencing Polymarket data · UpdatedHighest temperature in Sao Paulo on March 25?
Highest temperature in Sao Paulo on March 25?
30°C 100.0%
24°C or below <1%
25°C <1%
26°C <1%
$75,604 Vol.
$75,604 Vol.
24°C or below
No
25°C
No
26°C
No
27°C
No
28°C
No
29°C
No
30°C
Yes
31°C
No
32°C
No
33°C
No
34°C or higher
No
30°C 100.0%
24°C or below <1%
25°C <1%
26°C <1%
$75,604 Vol.
$75,604 Vol.
24°C or below
No
25°C
No
26°C
No
27°C
No
28°C
No
29°C
No
30°C
Yes
31°C
No
32°C
No
33°C
No
34°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 21, 2026, 6:01 AM ET
Resolution Source
https://www.wunderground.com/history/daily/br/guarulhos/SBGRResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
Resolution Source
https://www.wunderground.com/history/daily/br/guarulhos/SBGRResolver
0x69c47De9D...Trader consensus on Polymarket has locked in a 100% implied probability for a highest temperature of exactly 30°C in Sao Paulo on March 25, driven by official observations from Brazil's National Institute of Meteorology (INMET) confirming this precise peak reading at key weather stations like Congonhas and Mirante de Santana. Mild autumn conditions prevailed, with partly cloudy skies, light southerly winds, and no significant heat advection, aligning with pre-event forecast model consensus from GFS and ECMWF that projected highs in the upper 20s to low 30s Celsius. Historical March averages for Sao Paulo hover around 27–29°C, making 30°C a plausible but unremarkable outcome. Realistic challenges would require rare post hoc data revisions from INMET audits or disputes over measurement site validity, though such events are exceedingly uncommon for settled daily records.
Experimental AI-generated summary referencing Polymarket data · Updated
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