Recent forecasts from Brazil's INMET and CPTEC meteorological centers peg Sao Paulo's March 25 high at 28-30°C, fueling trader sentiment with 28°C (26.5%), 29°C (24%), and 30°C (21.5%) leading amid model divergence. Ensemble predictions from ECMWF and GFS show a mean around 29°C, but afternoon sea breeze penetration and urban heat island effects could cap peaks at 28°C, while persistent subtropical high pressure risks nudging toward 30°C. Historical late-March averages hover at 27.5°C, with low humidity amplifying heat indices; minimal rain probability (under 20%) differentiates these outcomes from cooler 26-27°C scenarios, as traders weigh short-range refinements expected by March 24.
Experimental AI-generated summary referencing Polymarket data · UpdatedHighest temperature in Sao Paulo on March 25?
Highest temperature in Sao Paulo on March 25?
28°C 27%
29°C 24%
30°C 22%
31°C 17%
24°C or below
2%
25°C
8%
26°C
9%
27°C
10%
28°C
27%
29°C
24%
30°C
22%
31°C
17%
32°C
14%
33°C
11%
34°C or higher
2%
28°C 27%
29°C 24%
30°C 22%
31°C 17%
24°C or below
2%
25°C
8%
26°C
9%
27°C
10%
28°C
27%
29°C
24%
30°C
22%
31°C
17%
32°C
14%
33°C
11%
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 21, 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...Recent forecasts from Brazil's INMET and CPTEC meteorological centers peg Sao Paulo's March 25 high at 28-30°C, fueling trader sentiment with 28°C (26.5%), 29°C (24%), and 30°C (21.5%) leading amid model divergence. Ensemble predictions from ECMWF and GFS show a mean around 29°C, but afternoon sea breeze penetration and urban heat island effects could cap peaks at 28°C, while persistent subtropical high pressure risks nudging toward 30°C. Historical late-March averages hover at 27.5°C, with low humidity amplifying heat indices; minimal rain probability (under 20%) differentiates these outcomes from cooler 26-27°C scenarios, as traders weigh short-range refinements expected by March 24.
Experimental AI-generated summary referencing Polymarket data · Updated
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