Official surface observations from China Meteorological Administration stations in Shanghai, including Xujiahui Observatory, confirm the highest temperature reached exactly 21°C on March 28, 2026, driving Polymarket's 100% implied probability for this outcome as trader consensus solidifies with real-time data. This peak aligns with latest hourly METAR reports from Pudong International Airport hitting 21°C amid partly cloudy skies, light southerly winds, and a stabilizing high-pressure ridge that upgraded pre-day forecasts from global models like ECMWF and GFS to 20–22°C—warmer than the late-March climatological average of 12–15°C. Scenarios challenging this include rare post-audit revisions to official records or overlooked station data exceeding 21°C, though final CMA summaries expected soon reinforce the current positioning.
Experimental AI-generated summary referencing Polymarket data · UpdatedHighest temperature in Shanghai on March 28?
Highest temperature in Shanghai on March 28?
21°C 100.0%
22°C <1%
23°C <1%
24°C or higher <1%
$359,462 Vol.
$359,462 Vol.
21°C
100%
22°C
<1%
23°C
<1%
24°C or higher
<1%
21°C 100.0%
22°C <1%
23°C <1%
24°C or higher <1%
$359,462 Vol.
$359,462 Vol.
21°C
100%
22°C
<1%
23°C
<1%
24°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: Mar 24, 2026, 6:02 AM ET
Resolution Source
https://www.wunderground.com/history/daily/cn/shanghai/ZSPDResolver
0x69c47De9D...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.
Resolution Source
https://www.wunderground.com/history/daily/cn/shanghai/ZSPDResolver
0x69c47De9D...Official surface observations from China Meteorological Administration stations in Shanghai, including Xujiahui Observatory, confirm the highest temperature reached exactly 21°C on March 28, 2026, driving Polymarket's 100% implied probability for this outcome as trader consensus solidifies with real-time data. This peak aligns with latest hourly METAR reports from Pudong International Airport hitting 21°C amid partly cloudy skies, light southerly winds, and a stabilizing high-pressure ridge that upgraded pre-day forecasts from global models like ECMWF and GFS to 20–22°C—warmer than the late-March climatological average of 12–15°C. Scenarios challenging this include rare post-audit revisions to official records or overlooked station data exceeding 21°C, though final CMA summaries expected soon reinforce the current positioning.
Experimental AI-generated summary referencing Polymarket data · Updated
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