Recent National Weather Service and model guidance points to a mild overnight low in Chicago on September 15 driven by southerly flow ahead of a frontal system, with forecast lows clustered in the mid-60s °F. Persistent cloud cover and scattered showers or thunderstorms are expected to limit radiational cooling, while warm advection from the south maintains elevated minimum temperatures compared with the 1991–2020 climatological average low near 59 °F. Ensemble spreads reflect modest uncertainty in exact cloud timing and precipitation coverage, which accounts for the tight clustering of market-implied probabilities across the 64–69 °F bins. Updated model runs and National Weather Service briefings over the next 48 hours will likely refine these thresholds ahead of market resolution.
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 15?
Lowest temperature in Chicago on September 15?
59°F or below 64%
78°F or higher 62%
60-61°F 39%
62-63°F 39%
NEW
NEW
Sep 15, 2026
59°F or below
64%
60-61°F
39%
62-63°F
39%
64-65°F
21%
66-67°F
27%
68-69°F
34%
70-71°F
39%
72-73°F
39%
74-75°F
39%
76-77°F
39%
78°F or higher
62%
59°F or below 64%
78°F or higher 62%
60-61°F 39%
62-63°F 39%
NEW
NEW
Sep 15, 2026
59°F or below
$0 Vol.
64%
60-61°F
$0 Vol.
39%
62-63°F
$0 Vol.
39%
64-65°F
$0 Vol.
21%
66-67°F
$0 Vol.
27%
68-69°F
$0 Vol.
34%
70-71°F
$0 Vol.
39%
72-73°F
$0 Vol.
39%
74-75°F
$0 Vol.
39%
76-77°F
$0 Vol.
39%
78°F or higher
$0 Vol.
62%
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 15 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.Recent National Weather Service and model guidance points to a mild overnight low in Chicago on September 15 driven by southerly flow ahead of a frontal system, with forecast lows clustered in the mid-60s °F. Persistent cloud cover and scattered showers or thunderstorms are expected to limit radiational cooling, while warm advection from the south maintains elevated minimum temperatures compared with the 1991–2020 climatological average low near 59 °F. Ensemble spreads reflect modest uncertainty in exact cloud timing and precipitation coverage, which accounts for the tight clustering of market-implied probabilities across the 64–69 °F bins. Updated model runs and National Weather Service briefings over the next 48 hours will likely refine these thresholds ahead of market resolution.
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 15 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 13, 2026, 1:29 PM ET
Volume
$0End Date
Sep 15, 2026Market Opened
Sep 13, 2026, 1:29 PM 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 15 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.Recent National Weather Service and model guidance points to a mild overnight low in Chicago on September 15 driven by southerly flow ahead of a frontal system, with forecast lows clustered in the mid-60s °F. Persistent cloud cover and scattered showers or thunderstorms are expected to limit radiational cooling, while warm advection from the south maintains elevated minimum temperatures compared with the 1991–2020 climatological average low near 59 °F. Ensemble spreads reflect modest uncertainty in exact cloud timing and precipitation coverage, which accounts for the tight clustering of market-implied probabilities across the 64–69 °F bins. Updated model runs and National Weather Service briefings over the next 48 hours will likely refine these thresholds ahead of market resolution.
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 15 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 15, 2026Market Opened
Sep 13, 2026, 1:29 PM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=kordResolver
0x69c47De9D...Recent National Weather Service and model guidance points to a mild overnight low in Chicago on September 15 driven by southerly flow ahead of a frontal system, with forecast lows clustered in the mid-60s °F. Persistent cloud cover and scattered showers or thunderstorms are expected to limit radiational cooling, while warm advection from the south maintains elevated minimum temperatures compared with the 1991–2020 climatological average low near 59 °F. Ensemble spreads reflect modest uncertainty in exact cloud timing and precipitation coverage, which accounts for the tight clustering of market-implied probabilities across the 64–69 °F bins. Updated model runs and National Weather Service briefings over the next 48 hours will likely refine these thresholds ahead of market resolution.
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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