Ensemble forecasts from the European Centre for Medium-Range Weather Forecasts and Global Forecast System currently indicate a daily maximum near 27°C in Shanghai, driven by persistent high-pressure ridging that promotes subsidence warming and light southerly flow advecting milder air masses. This setup aligns with mid-May climatological normals of 24–26°C while supporting above-average readings under mostly clear skies and minimal cloud cover. The market’s 99.9% implied probability for exactly 27°C reflects trader consensus on these stable atmospheric conditions, with official observations at Shanghai Pudong International Airport serving as the resolution source. Minor shifts in wind speed or boundary-layer moisture over the next few hours remain the primary variables that could nudge the peak by one degree.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedHighest temperature in Shanghai on May 17?
27°C 99.9%
21°C or below <1%
22°C <1%
23°C <1%
$135,965 Vol.
$135,965 Vol.
21°C or below
<1%
22°C
<1%
23°C
<1%
24°C
<1%
25°C
<1%
26°C
<1%
27°C
100%
28°C
<1%
29°C
<1%
30°C
<1%
31°C or higher
<1%
27°C 99.9%
21°C or below <1%
22°C <1%
23°C <1%
$135,965 Vol.
$135,965 Vol.
21°C or below
<1%
22°C
<1%
23°C
<1%
24°C
<1%
25°C
<1%
26°C
<1%
27°C
100%
28°C
<1%
29°C
<1%
30°C
<1%
31°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 Shanghai Pudong International Airport Station once information is finalized, available here: https://www.wunderground.com/history/daily/cn/shanghai/ZSPD.
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: May 15, 2026, 12:04 AM ET
Resolution Source
https://www.wunderground.com/history/daily/cn/shanghai/ZSPDThe 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 Shanghai Pudong International Airport Station once information is finalized, available here: https://www.wunderground.com/history/daily/cn/shanghai/ZSPD.
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.
Resolution Source
https://www.wunderground.com/history/daily/cn/shanghai/ZSPDEnsemble forecasts from the European Centre for Medium-Range Weather Forecasts and Global Forecast System currently indicate a daily maximum near 27°C in Shanghai, driven by persistent high-pressure ridging that promotes subsidence warming and light southerly flow advecting milder air masses. This setup aligns with mid-May climatological normals of 24–26°C while supporting above-average readings under mostly clear skies and minimal cloud cover. The market’s 99.9% implied probability for exactly 27°C reflects trader consensus on these stable atmospheric conditions, with official observations at Shanghai Pudong International Airport serving as the resolution source. Minor shifts in wind speed or boundary-layer moisture over the next few hours remain the primary variables that could nudge the peak by one degree.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · Updated

Beware of external links.
Beware of external links.
Frequently Asked Questions