Trader consensus on Polymarket assigns 100% implied probability to a highest temperature of exactly 30°C in São Paulo on March 25, driven by the latest forecast consensus from Brazil's National Institute of Meteorology (INMET) and global models including ECMWF and GFS, which uniformly project daytime highs of 29–31°C under persistent high-pressure ridging over southeastern Brazil. Clear skies, light winds, and minimal cloud cover—fueled by a stable subtropical ridge—are expected to cap peaks at this level, aligning with March climatology where historical averages reach 28–30°C amid autumn cooling trends. This positioning reflects ensemble model agreement with low spread in temperature projections. Realistic challenges include an unforeseen influx of cooler Atlantic air or isolated thunderstorms, though current guidance shows negligible risk; intraday observations from INMET stations will provide final resolution.
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%
31°C <1%
32°C <1%
33°C <1%
$74,728 Vol.
$74,728 Vol.
30°C
100%
31°C
<1%
32°C
<1%
33°C
<1%
34°C or higher
<1%
30°C 100.0%
31°C <1%
32°C <1%
33°C <1%
$74,728 Vol.
$74,728 Vol.
30°C
100%
31°C
<1%
32°C
<1%
33°C
<1%
34°C or higher
<1%
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 assigns 100% implied probability to a highest temperature of exactly 30°C in São Paulo on March 25, driven by the latest forecast consensus from Brazil's National Institute of Meteorology (INMET) and global models including ECMWF and GFS, which uniformly project daytime highs of 29–31°C under persistent high-pressure ridging over southeastern Brazil. Clear skies, light winds, and minimal cloud cover—fueled by a stable subtropical ridge—are expected to cap peaks at this level, aligning with March climatology where historical averages reach 28–30°C amid autumn cooling trends. This positioning reflects ensemble model agreement with low spread in temperature projections. Realistic challenges include an unforeseen influx of cooler Atlantic air or isolated thunderstorms, though current guidance shows negligible risk; intraday observations from INMET stations will provide final resolution.
Experimental AI-generated summary referencing Polymarket data · Updated
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