Trader consensus on Polymarket heavily favors a Shanghai high of 13°C (36.5%) or 14°C (29.0%) for March 20, driven by the latest ECMWF and GFS ensemble forecasts converging on afternoon peaks in that narrow range amid mild southerly flows. Differentiating these close outcomes hinges on subtle model variations: ECMWF leans slightly cooler at 13°C due to anticipated marine layer persistence from the East China Sea, while GFS implies a touch warmer 14°C with stronger boundary layer mixing under partly cloudy skies. Historical March 20 averages hover at 13.5°C, but recent cold air intrusions have trimmed expectations from earlier 15°C+ projections, with low-confidence outliers like 16°C+ at just 2.1% reflecting ensemble spread. Traders eye final CMA updates for resolution cues.
Experimental AI-generated summary referencing Polymarket data · UpdatedHighest temperature in Shanghai on March 20?
Highest temperature in Shanghai on March 20?
13°C 37%
14°C 29%
15°C 15%
12°C 10%
$35,269 Vol.
$35,269 Vol.
6°C or below
<1%
7°C
<1%
8°C
<1%
9°C
<1%
10°C
1%
11°C
4%
12°C
10%
13°C
37%
14°C
29%
15°C
15%
16°C or higher
2%
13°C 37%
14°C 29%
15°C 15%
12°C 10%
$35,269 Vol.
$35,269 Vol.
6°C or below
<1%
7°C
<1%
8°C
<1%
9°C
<1%
10°C
1%
11°C
4%
12°C
10%
13°C
37%
14°C
29%
15°C
15%
16°C or higher
2%
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 16, 2026, 6:02 AM ET
Resolution Source
https://www.wunderground.com/history/daily/cn/shanghai/ZSPDResolver
0x69c47De9D...Resolution Source
https://www.wunderground.com/history/daily/cn/shanghai/ZSPDResolver
0x69c47De9D...Trader consensus on Polymarket heavily favors a Shanghai high of 13°C (36.5%) or 14°C (29.0%) for March 20, driven by the latest ECMWF and GFS ensemble forecasts converging on afternoon peaks in that narrow range amid mild southerly flows. Differentiating these close outcomes hinges on subtle model variations: ECMWF leans slightly cooler at 13°C due to anticipated marine layer persistence from the East China Sea, while GFS implies a touch warmer 14°C with stronger boundary layer mixing under partly cloudy skies. Historical March 20 averages hover at 13.5°C, but recent cold air intrusions have trimmed expectations from earlier 15°C+ projections, with low-confidence outliers like 16°C+ at just 2.1% reflecting ensemble spread. Traders eye final CMA updates for resolution cues.
Experimental AI-generated summary referencing Polymarket data · Updated
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