Trader consensus favors 29°C (34%) and 28°C (27%) for São Paulo's March 23 high, driven by the latest INMET and Climatempo forecasts projecting peaks of 28-29°C amid a stable subtropical high-pressure ridge suppressing clouds and boosting solar insolation. Differentiating these outcomes are ensemble model divergences: ECMWF anticipates fuller afternoon heating to 29°C under low convective activity, while GFS implies slight sea-breeze moderation capping at 28°C, reflecting urban heat island amplification atop March's historical average of 27.5°C. Low wind shear and minimal precipitation risk heighten uncertainty in the diurnal peak timing around 2-4 PM local time.
Experimental AI-generated summary referencing Polymarket data · UpdatedHighest temperature in Sao Paulo on March 23?
Highest temperature in Sao Paulo on March 23?
29°C 34%
28°C 27%
27°C 18.5%
30°C 16%
$12,692 Vol.
$12,692 Vol.
22°C or below
<1%
23°C
<1%
24°C
1%
25°C
2%
26°C
5%
27°C
19%
28°C
27%
29°C
34%
30°C
16%
31°C
6%
32°C or higher
2%
29°C 34%
28°C 27%
27°C 18.5%
30°C 16%
$12,692 Vol.
$12,692 Vol.
22°C or below
<1%
23°C
<1%
24°C
1%
25°C
2%
26°C
5%
27°C
19%
28°C
27%
29°C
34%
30°C
16%
31°C
6%
32°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 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...Trader consensus favors 29°C (34%) and 28°C (27%) for São Paulo's March 23 high, driven by the latest INMET and Climatempo forecasts projecting peaks of 28-29°C amid a stable subtropical high-pressure ridge suppressing clouds and boosting solar insolation. Differentiating these outcomes are ensemble model divergences: ECMWF anticipates fuller afternoon heating to 29°C under low convective activity, while GFS implies slight sea-breeze moderation capping at 28°C, reflecting urban heat island amplification atop March's historical average of 27.5°C. Low wind shear and minimal precipitation risk heighten uncertainty in the diurnal peak timing around 2-4 PM local time.
Experimental AI-generated summary referencing Polymarket data · Updated
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