Trader consensus overwhelmingly favors 26°C as Sao Paulo's highest temperature on March 20, driven by official observations from Brazil's National Institute of Meteorology (INMET) and airport weather stations at Congonhas and Guarulhos, which recorded peaks at or just below this threshold amid cloudy, stable autumn conditions. Historical March data shows averages of 24-27°C with low variability due to the city's subtropical highland climate, reinforced by aligned short-range forecasts from ECMWF and GFS models predicting mild southerly winds suppressing heat. Realistic challenges include microclimate variations from urban heat islands or late-day clearing, potentially pushing to 27°C if cloud cover lifts unexpectedly, though current telemetry indicates scant risk.
Experimental AI-generated summary referencing Polymarket data · UpdatedHighest temperature in Sao Paulo on March 20?
Highest temperature in Sao Paulo on March 20?
26°C 100.0%
23°C or below <1%
24°C <1%
25°C <1%
$166,174 Vol.
$166,174 Vol.
23°C or below
No
24°C
No
25°C
No
26°C
Yes
27°C
No
28°C
No
29°C
No
30°C
No
31°C
No
32°C
No
33°C or higher
No
26°C 100.0%
23°C or below <1%
24°C <1%
25°C <1%
$166,174 Vol.
$166,174 Vol.
23°C or below
No
24°C
No
25°C
No
26°C
Yes
27°C
No
28°C
No
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: Mar 16, 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 overwhelmingly favors 26°C as Sao Paulo's highest temperature on March 20, driven by official observations from Brazil's National Institute of Meteorology (INMET) and airport weather stations at Congonhas and Guarulhos, which recorded peaks at or just below this threshold amid cloudy, stable autumn conditions. Historical March data shows averages of 24-27°C with low variability due to the city's subtropical highland climate, reinforced by aligned short-range forecasts from ECMWF and GFS models predicting mild southerly winds suppressing heat. Realistic challenges include microclimate variations from urban heat islands or late-day clearing, potentially pushing to 27°C if cloud cover lifts unexpectedly, though current telemetry indicates scant risk.
Experimental AI-generated summary referencing Polymarket data · Updated
Beware of external links.
Beware of external links.
Frequently Asked Questions