Latest forecasts from the Shanghai Meteorological Bureau and global models show a minimum temperature near 24°C on September 18, supported by northeasterly winds, persistent cloud cover, and light rain that limits overnight radiative cooling. This positions the 24°C outcome as the market leader at 40% implied probability. Historical September minima in Shanghai average 21–24°C, with recent days holding lows around 23°C amid similar patterns. Model consensus remains tight on the daily range of 24–30°C, though slight variations in rain timing or wind strength could shift the exact low by 1°C. Updated guidance ahead of the date will refine trader positioning on nearby thresholds like 23°C or 25°C.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedLowest temperature in Shanghai on September 18?
19°C or below 45%
25°C 39%
24°C 29%
22°C 27%
19°C or below
45%
20°C
20%
21°C
22%
22°C
27%
23°C
22%
24°C
40%
25°C
39%
26°C
27%
27°C
22%
28°C
20%
29°C or higher
25%
19°C or below 45%
25°C 39%
24°C 29%
22°C 27%
19°C or below
45%
20°C
20%
21°C
22%
22°C
27%
23°C
22%
24°C
40%
25°C
39%
26°C
27%
27°C
22%
28°C
20%
29°C or higher
25%
The resolution source for this market will be information from NOAA, specifically the lowest reading under the "Temp" column for all times on this day, available here: https://www.weather.gov/wrh/timeseries?site=zspd
If NOAA data for the observation date is unavailable by 11:59 PM ET on the day following the observation date, the Weather Underground Daily Observations table will be used as the resolution source.
In the event that there is no data for the observation date by 11:59 PM ET on the day following the observation date, this market will resolve to the lowest bracket.
To toggle between Fahrenheit and Celsius, click the "Switch to Metric Units" button until the relevant table displays °C.
This market will resolve once the first data point for the following date has been published on the resolution source, or by 11:59 PM ET on the day following the observation date, whichever comes first.
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.
Revisions to temperatures recorded within this market's timeframe will be considered until the first datapoint for the following date has been published, after which any alterations will not be considered.
Market Opened: Sep 16, 2026, 12:30 AM ET
Resolution Source
https://www.weather.gov/wrh/timeseries?site=zspdResolver
0x69c47De9D...The resolution source for this market will be information from NOAA, specifically the lowest reading under the "Temp" column for all times on this day, available here: https://www.weather.gov/wrh/timeseries?site=zspd
If NOAA data for the observation date is unavailable by 11:59 PM ET on the day following the observation date, the Weather Underground Daily Observations table will be used as the resolution source.
In the event that there is no data for the observation date by 11:59 PM ET on the day following the observation date, this market will resolve to the lowest bracket.
To toggle between Fahrenheit and Celsius, click the "Switch to Metric Units" button until the relevant table displays °C.
This market will resolve once the first data point for the following date has been published on the resolution source, or by 11:59 PM ET on the day following the observation date, whichever comes first.
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.
Revisions to temperatures recorded within this market's timeframe will be considered until the first datapoint for the following date has been published, after which any alterations will not be considered.
Resolution Source
https://www.weather.gov/wrh/timeseries?site=zspdResolver
0x69c47De9D...Latest forecasts from the Shanghai Meteorological Bureau and global models show a minimum temperature near 24°C on September 18, supported by northeasterly winds, persistent cloud cover, and light rain that limits overnight radiative cooling. This positions the 24°C outcome as the market leader at 40% implied probability. Historical September minima in Shanghai average 21–24°C, with recent days holding lows around 23°C amid similar patterns. Model consensus remains tight on the daily range of 24–30°C, though slight variations in rain timing or wind strength could shift the exact low by 1°C. Updated guidance ahead of the date will refine trader positioning on nearby thresholds like 23°C or 25°C.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · Updated
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Frequently Asked Questions