Latest ensemble forecasts from INMET and global models like ECMWF and GFS converge on a 31°C high for São Paulo on March 22, anchoring its 28% implied probability lead over closely trailing 30°C (20.5%) and 32°C (17.5%) odds. This reflects a strengthening subtropical high-pressure ridge fostering clear skies and above-average late-summer heat—historical March peaks average 28°C—but with uncertainty from Atlantic sea breeze penetration, which could moderate boundary-layer warming to 30°C if stronger, or allow convective heating to 32°C under lighter winds. Yesterday's model updates nudged peaks upward from 30°C consensus, with low precipitation risk keeping extremes unlikely. Traders eye tomorrow's INMET refresh for resolution cues.
Experimental AI-generated summary referencing Polymarket data · UpdatedHighest temperature in Sao Paulo on March 22?
Highest temperature in Sao Paulo on March 22?
31°C 27%
30°C 24%
32°C 18%
29°C 16%
24°C or below
1%
25°C
1%
26°C
2%
27°C
3%
28°C
10%
29°C
16%
30°C
24%
31°C
27%
32°C
18%
33°C
10%
34°C or higher
4%
31°C 27%
30°C 24%
32°C 18%
29°C 16%
24°C or below
1%
25°C
1%
26°C
2%
27°C
3%
28°C
10%
29°C
16%
30°C
24%
31°C
27%
32°C
18%
33°C
10%
34°C or higher
4%
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 18, 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...Latest ensemble forecasts from INMET and global models like ECMWF and GFS converge on a 31°C high for São Paulo on March 22, anchoring its 28% implied probability lead over closely trailing 30°C (20.5%) and 32°C (17.5%) odds. This reflects a strengthening subtropical high-pressure ridge fostering clear skies and above-average late-summer heat—historical March peaks average 28°C—but with uncertainty from Atlantic sea breeze penetration, which could moderate boundary-layer warming to 30°C if stronger, or allow convective heating to 32°C under lighter winds. Yesterday's model updates nudged peaks upward from 30°C consensus, with low precipitation risk keeping extremes unlikely. Traders eye tomorrow's INMET refresh for resolution cues.
Experimental AI-generated summary referencing Polymarket data · Updated
Beware of external links.
Beware of external links.
Frequently Asked Questions