Trader consensus on Polymarket tilts toward a 31°C high in Sao Paulo on March 27 at 31.5% implied probability, narrowly ahead of 30°C (28%), driven by INMET's latest forecast projecting peak afternoon heat amid persistent high-pressure ridging and urban heat island effects amplifying surface temperatures by 1-2°C above rural areas. Differentiating factors include model ensemble spreads—GFS runs skewing toward 32°C with sunnier skies, while ECMWF hints at 30°C via increased sea breeze incursions and isolated thunderstorms capping highs. Historical March averages hover near 28°C, but recent anomalous warmth from La Niña decay adds upside risk, with final resolution hinging on morning soundings and cloud cover evolution.
Experimental AI-generated summary referencing Polymarket data · UpdatedHighest temperature in Sao Paulo on March 27?
Highest temperature in Sao Paulo on March 27?
31°C 31%
30°C 29%
29°C 17%
32°C 16%
24°C or below
1%
25°C
1%
26°C
2%
27°C
3%
28°C
4%
29°C
17%
30°C
29%
31°C
31%
32°C
16%
33°C
5%
34°C or higher
2%
31°C 31%
30°C 29%
29°C 17%
32°C 16%
24°C or below
1%
25°C
1%
26°C
2%
27°C
3%
28°C
4%
29°C
17%
30°C
29%
31°C
31%
32°C
16%
33°C
5%
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 23, 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 tilts toward a 31°C high in Sao Paulo on March 27 at 31.5% implied probability, narrowly ahead of 30°C (28%), driven by INMET's latest forecast projecting peak afternoon heat amid persistent high-pressure ridging and urban heat island effects amplifying surface temperatures by 1-2°C above rural areas. Differentiating factors include model ensemble spreads—GFS runs skewing toward 32°C with sunnier skies, while ECMWF hints at 30°C via increased sea breeze incursions and isolated thunderstorms capping highs. Historical March averages hover near 28°C, but recent anomalous warmth from La Niña decay adds upside risk, with final resolution hinging on morning soundings and cloud cover evolution.
Experimental AI-generated summary referencing Polymarket data · Updated
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