Persistent cloud cover, elevated dew points near 65°F, and light northeast winds are limiting radiative cooling overnight, keeping the September 17 minimum in Chicago anchored in the mid-to-upper 60s according to National Weather Service guidance. Recent model runs show only modest spread in the exact low, with the 66-67°F and 68-69°F bins capturing the tightest consensus amid ongoing humid air mass and scattered shower chances that further suppress temperature drops. Historical September averages near 58°F are being exceeded by several degrees due to the entrenched warm pattern, while any brief clearing or wind shift could nudge the reading a degree or two lower into the 64-65°F range. Updated NWS and high-resolution model outputs through the evening will refine the final resolution threshold.
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 17?
Lowest temperature in Chicago on September 17?
59°F or below 58%
66-67°F 40%
70-71°F 37%
68-69°F 29%
NEW
NEW
Sep 17, 2026
59°F or below
58%
60-61°F
14%
62-63°F
19%
64-65°F
23%
66-67°F
33%
68-69°F
29%
70-71°F
37%
72-73°F
14%
74-75°F
5%
76-77°F
1%
78°F or higher
1%
59°F or below 58%
66-67°F 40%
70-71°F 37%
68-69°F 29%
NEW
NEW
Sep 17, 2026
59°F or below
$0 Vol.
58%
60-61°F
$0 Vol.
14%
62-63°F
$0 Vol.
19%
64-65°F
$3 Vol.
23%
66-67°F
$5 Vol.
33%
68-69°F
$0 Vol.
29%
70-71°F
$0 Vol.
37%
72-73°F
$0 Vol.
14%
74-75°F
$0 Vol.
5%
76-77°F
$0 Vol.
1%
78°F or higher
$0 Vol.
1%
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 17 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.Persistent cloud cover, elevated dew points near 65°F, and light northeast winds are limiting radiative cooling overnight, keeping the September 17 minimum in Chicago anchored in the mid-to-upper 60s according to National Weather Service guidance. Recent model runs show only modest spread in the exact low, with the 66-67°F and 68-69°F bins capturing the tightest consensus amid ongoing humid air mass and scattered shower chances that further suppress temperature drops. Historical September averages near 58°F are being exceeded by several degrees due to the entrenched warm pattern, while any brief clearing or wind shift could nudge the reading a degree or two lower into the 64-65°F range. Updated NWS and high-resolution model outputs through the evening will refine the final resolution threshold.
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 17 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 15, 2026, 3:29 AM ET
Volume
$8End Date
Sep 17, 2026Market Opened
Sep 15, 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 17 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.Persistent cloud cover, elevated dew points near 65°F, and light northeast winds are limiting radiative cooling overnight, keeping the September 17 minimum in Chicago anchored in the mid-to-upper 60s according to National Weather Service guidance. Recent model runs show only modest spread in the exact low, with the 66-67°F and 68-69°F bins capturing the tightest consensus amid ongoing humid air mass and scattered shower chances that further suppress temperature drops. Historical September averages near 58°F are being exceeded by several degrees due to the entrenched warm pattern, while any brief clearing or wind shift could nudge the reading a degree or two lower into the 64-65°F range. Updated NWS and high-resolution model outputs through the evening will refine the final resolution threshold.
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 17 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
$8End Date
Sep 17, 2026Market Opened
Sep 15, 2026, 3:29 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=kordResolver
0x69c47De9D...Persistent cloud cover, elevated dew points near 65°F, and light northeast winds are limiting radiative cooling overnight, keeping the September 17 minimum in Chicago anchored in the mid-to-upper 60s according to National Weather Service guidance. Recent model runs show only modest spread in the exact low, with the 66-67°F and 68-69°F bins capturing the tightest consensus amid ongoing humid air mass and scattered shower chances that further suppress temperature drops. Historical September averages near 58°F are being exceeded by several degrees due to the entrenched warm pattern, while any brief clearing or wind shift could nudge the reading a degree or two lower into the 64-65°F range. Updated NWS and high-resolution model outputs through the evening will refine the final resolution threshold.
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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