Trader consensus on Polymarket reflects tight forecast uncertainty for São Paulo's highest temperature on March 28, with models like GFS and ECMWF ensembles implying peaks around 29–31°C amid a high-pressure ridge promoting clear skies and radiative heating. Recent INMET updates show daytime highs favoring 30°C (28.5% implied probability) due to low humidity and light southerly winds limiting sea-breeze cooling, though slight cloud development could cap at 29°C (19.5%) or push to 31°C (22.5%). Urban heat island effects amplify readings at official stations like Mirante de Santana. Historical March averages hover near 28°C, but current subtropical high dominance boosts extremes; watch afternoon soundings and satellite imagery for final convective risks before evening cooldown.
Experimental AI-generated summary referencing Polymarket data · UpdatedHighest temperature in Sao Paulo on March 28?
Highest temperature in Sao Paulo on March 28?
30°C 27%
31°C 23%
29°C 21%
32°C 11%
$11,433 Vol.
$11,433 Vol.
24°C or below
<1%
25°C
1%
26°C
1%
27°C
6%
28°C
10%
29°C
21%
30°C
27%
31°C
23%
32°C
11%
33°C
6%
34°C or higher
2%
30°C 27%
31°C 23%
29°C 21%
32°C 11%
$11,433 Vol.
$11,433 Vol.
24°C or below
<1%
25°C
1%
26°C
1%
27°C
6%
28°C
10%
29°C
21%
30°C
27%
31°C
23%
32°C
11%
33°C
6%
34°C or higher
2%
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 24, 2026, 6:01 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...Trader consensus on Polymarket reflects tight forecast uncertainty for São Paulo's highest temperature on March 28, with models like GFS and ECMWF ensembles implying peaks around 29–31°C amid a high-pressure ridge promoting clear skies and radiative heating. Recent INMET updates show daytime highs favoring 30°C (28.5% implied probability) due to low humidity and light southerly winds limiting sea-breeze cooling, though slight cloud development could cap at 29°C (19.5%) or push to 31°C (22.5%). Urban heat island effects amplify readings at official stations like Mirante de Santana. Historical March averages hover near 28°C, but current subtropical high dominance boosts extremes; watch afternoon soundings and satellite imagery for final convective risks before evening cooldown.
Experimental AI-generated summary referencing Polymarket data · Updated
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