Ensemble forecasts from ECMWF, GFS, and Brazil's INMET pin Sao Paulo's March 26 high temperature near 28-30°C, fueling the tight trader contest with 29°C leading at 24% implied odds amid typical late-summer warmth averaging 28°C historically. Differentiating factors include model spreads on afternoon cloud cover—more persistent stratus favors 28°C (21.5%), while clearer skies and urban heat island amplification boost 30°C (22%) or 31°C (18.5%). Light southerly sea breezes cap extremes, sidelining 32°C+ (19%), while low humidity and weak cold front risks keep sub-27°C improbable. Monitor INMET's next update for shifts in convective activity.
Experimental AI-generated summary referencing Polymarket data · UpdatedHighest temperature in Sao Paulo on March 26?
Highest temperature in Sao Paulo on March 26?
29°C 31%
27°C 30%
30°C 23%
28°C 21%
22°C or below
1%
23°C
4%
24°C
14%
25°C
16%
26°C
17%
27°C
19%
28°C
21%
29°C
23%
30°C
23%
31°C
17%
32°C or higher
18%
29°C 31%
27°C 30%
30°C 23%
28°C 21%
22°C or below
1%
23°C
4%
24°C
14%
25°C
16%
26°C
17%
27°C
19%
28°C
21%
29°C
23%
30°C
23%
31°C
17%
32°C or higher
18%
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 22, 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...Ensemble forecasts from ECMWF, GFS, and Brazil's INMET pin Sao Paulo's March 26 high temperature near 28-30°C, fueling the tight trader contest with 29°C leading at 24% implied odds amid typical late-summer warmth averaging 28°C historically. Differentiating factors include model spreads on afternoon cloud cover—more persistent stratus favors 28°C (21.5%), while clearer skies and urban heat island amplification boost 30°C (22%) or 31°C (18.5%). Light southerly sea breezes cap extremes, sidelining 32°C+ (19%), while low humidity and weak cold front risks keep sub-27°C improbable. Monitor INMET's next update for shifts in convective activity.
Experimental AI-generated summary referencing Polymarket data · Updated
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