Trader consensus heavily favors 30°C (41.5% implied probability) as Sao Paulo's highest temperature on March 25, driven by the latest INMET and CPTEC forecasts showing peak afternoon heat under a stable high-pressure ridge suppressing clouds and rainfall. Ensemble models like GFS and ECMWF converge on maxima of 29-31°C, reflecting persistent subtropical warmth amplified by the city's urban heat island effect, where concrete surfaces boost temperatures 2-3°C above rural baselines. Recent developments include a slight upward revision in model runs after March 23 data confirmed drier conditions than initially projected, reducing odds for cooler outcomes below 28°C while elevating 30-31°C probabilities amid low wind shear and high solar insolation. Historical March averages hover at 27-28°C, but this year's El Niño hangover sustains above-normal heat.
Experimental AI-generated summary referencing Polymarket data · UpdatedHighest temperature in Sao Paulo on March 25?
Highest temperature in Sao Paulo on March 25?
30°C 43%
29°C 31%
31°C 14%
28°C 11%
$19,700 Vol.
$19,700 Vol.
24°C or below
<1%
25°C
<1%
26°C
1%
27°C
1%
28°C
11%
29°C
31%
30°C
43%
31°C
14%
32°C
3%
33°C
<1%
34°C or higher
<1%
30°C 43%
29°C 31%
31°C 14%
28°C 11%
$19,700 Vol.
$19,700 Vol.
24°C or below
<1%
25°C
<1%
26°C
1%
27°C
1%
28°C
11%
29°C
31%
30°C
43%
31°C
14%
32°C
3%
33°C
<1%
34°C or higher
<1%
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...Trader consensus heavily favors 30°C (41.5% implied probability) as Sao Paulo's highest temperature on March 25, driven by the latest INMET and CPTEC forecasts showing peak afternoon heat under a stable high-pressure ridge suppressing clouds and rainfall. Ensemble models like GFS and ECMWF converge on maxima of 29-31°C, reflecting persistent subtropical warmth amplified by the city's urban heat island effect, where concrete surfaces boost temperatures 2-3°C above rural baselines. Recent developments include a slight upward revision in model runs after March 23 data confirmed drier conditions than initially projected, reducing odds for cooler outcomes below 28°C while elevating 30-31°C probabilities amid low wind shear and high solar insolation. Historical March averages hover at 27-28°C, but this year's El Niño hangover sustains above-normal heat.
Experimental AI-generated summary referencing Polymarket data · Updated
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