Trader consensus on Polymarket shows tight clustering around 29–31°C for São Paulo's highest temperature on March 28, reflecting forecast model agreement amid inherent daily weather uncertainty. Latest GFS and ECMWF ensemble runs project peaks in this range, driven by a persistent subtropical high-pressure ridge promoting clear skies, light winds, and radiative heating over the urban heat island of São Paulo. INMET observations confirm recent highs of 28–30°C with dry soil moisture favoring slight intensification potential, though sea breeze incursions could cap at 29°C. Historical late-March averages hover near 28°C, but current El Niño decay patterns add warmth. Watch afternoon updates from 12Z model cycles for refinements ahead of official airport measurements at Congonhas resolving the market.
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 31%
29°C 20%
31°C 17%
32°C 12%
$13,076 Vol.
$13,076 Vol.
24°C or below
<1%
25°C
1%
26°C
1%
27°C
6%
28°C
10%
29°C
20%
30°C
31%
31°C
17%
32°C
12%
33°C
6%
34°C or higher
3%
30°C 31%
29°C 20%
31°C 17%
32°C 12%
$13,076 Vol.
$13,076 Vol.
24°C or below
<1%
25°C
1%
26°C
1%
27°C
6%
28°C
10%
29°C
20%
30°C
31%
31°C
17%
32°C
12%
33°C
6%
34°C or higher
3%
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 shows tight clustering around 29–31°C for São Paulo's highest temperature on March 28, reflecting forecast model agreement amid inherent daily weather uncertainty. Latest GFS and ECMWF ensemble runs project peaks in this range, driven by a persistent subtropical high-pressure ridge promoting clear skies, light winds, and radiative heating over the urban heat island of São Paulo. INMET observations confirm recent highs of 28–30°C with dry soil moisture favoring slight intensification potential, though sea breeze incursions could cap at 29°C. Historical late-March averages hover near 28°C, but current El Niño decay patterns add warmth. Watch afternoon updates from 12Z model cycles for refinements ahead of official airport measurements at Congonhas resolving the market.
Experimental AI-generated summary referencing Polymarket data · Updated
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