Tight clustering of market-implied probabilities around 28–30°C reflects consensus from leading weather models like ECMWF and GFS, which project afternoon highs in this range for São Paulo on March 23 amid lingering summer warmth and moderate humidity. Recent forecast updates from Brazil's INMET indicate a peak near 29°C, driven by light southerly winds tempering urban heat island effects, though slight variations stem from uncertainty in convective cloud development—potentially capping temperatures at 28°C or pushing to 30°C+ with clearer skies. Historical March averages hover at 27–29°C, but ensemble spreads of 1–2°C underscore trader caution, with no major cold fronts disrupting the mild tropical pattern.
Resumo experimental gerado por IA com dados do Polymarket · AtualizadoHighest temperature in Sao Paulo on March 23?
Highest temperature in Sao Paulo on March 23?
28°C 26%
29°C 26%
30°C 22%
31°C 18%
22°C or below
1%
23°C
9%
24°C
10%
25°C
9%
26°C
10%
27°C
7%
28°C
26%
29°C
26%
30°C
22%
31°C
18%
32°C or higher
16%
28°C 26%
29°C 26%
30°C 22%
31°C 18%
22°C or below
1%
23°C
9%
24°C
10%
25°C
9%
26°C
10%
27°C
7%
28°C
26%
29°C
26%
30°C
22%
31°C
18%
32°C or higher
16%
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.
Mercado Aberto: Mar 19, 2026, 6:02 AM ET
Resolution Source
https://www.wunderground.com/history/daily/br/guarulhos/SBGRResolver
0x69c47De9D...Resolution Source
https://www.wunderground.com/history/daily/br/guarulhos/SBGRResolver
0x69c47De9D...Tight clustering of market-implied probabilities around 28–30°C reflects consensus from leading weather models like ECMWF and GFS, which project afternoon highs in this range for São Paulo on March 23 amid lingering summer warmth and moderate humidity. Recent forecast updates from Brazil's INMET indicate a peak near 29°C, driven by light southerly winds tempering urban heat island effects, though slight variations stem from uncertainty in convective cloud development—potentially capping temperatures at 28°C or pushing to 30°C+ with clearer skies. Historical March averages hover at 27–29°C, but ensemble spreads of 1–2°C underscore trader caution, with no major cold fronts disrupting the mild tropical pattern.
Resumo experimental gerado por IA com dados do Polymarket · Atualizado
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