Trader consensus on Sao Paulo's March 23 high temperature clusters tightly around 28–29°C, driven by the latest INMET and ECMWF model runs projecting peaks of 28.5–29.5°C amid a persistent high-pressure ridge over southern Brazil. This edges out 30°C odds, as urban heat island effects in the city amplify baseline March averages of 27–28°C, but afternoon sea breezes and potential convective showers introduce uncertainty, often capping highs by 1–2°C. Historical data shows 70% of similar setups stay below 30°C, with traders monitoring hourly updates from CPTEC for cloud cover resolution—key to differentiating these razor-thin implied probabilities.
Experimental AI-generated summary referencing Polymarket data · UpdatedHighest temperature in Sao Paulo on March 23?
Highest temperature in Sao Paulo on March 23?
28°C 34%
29°C 34%
30°C 17%
27°C 12.4%
$12,470 Vol.
$12,470 Vol.
22°C or below
<1%
23°C
<1%
24°C
1%
25°C
2%
26°C
4%
27°C
12%
28°C
28%
29°C
34%
30°C
17%
31°C
6%
32°C or higher
2%
28°C 34%
29°C 34%
30°C 17%
27°C 12.4%
$12,470 Vol.
$12,470 Vol.
22°C or below
<1%
23°C
<1%
24°C
1%
25°C
2%
26°C
4%
27°C
12%
28°C
28%
29°C
34%
30°C
17%
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 on Sao Paulo's March 23 high temperature clusters tightly around 28–29°C, driven by the latest INMET and ECMWF model runs projecting peaks of 28.5–29.5°C amid a persistent high-pressure ridge over southern Brazil. This edges out 30°C odds, as urban heat island effects in the city amplify baseline March averages of 27–28°C, but afternoon sea breezes and potential convective showers introduce uncertainty, often capping highs by 1–2°C. Historical data shows 70% of similar setups stay below 30°C, with traders monitoring hourly updates from CPTEC for cloud cover resolution—key to differentiating these razor-thin implied probabilities.
Experimental AI-generated summary referencing Polymarket data · Updated
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