**Official observations from Chicago O'Hare Airport confirm a daily minimum of 71°F on September 9, 2026, aligning with the market's dominant 70-71°F outcome at 99% implied probability.** National Weather Service data recorded the low at 7:06 AM local time under conditions that included light rain and fog, following a maximum of 80°F later that afternoon—well above the 1991-2020 normal low of 60°F for the date. This result sits near the upper end of typical early-September ranges and far above historical daily records near 47°F. The strong trader consensus reflects verified station data rather than forecasts, with resolution hinging on the official NWS climatological summary. Scenarios that could challenge the outcome include any post hoc revision to the preliminary reading or use of an alternate station, though such adjustments remain unlikely given the clear observational record.
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 9?
Lowest temperature in Chicago on September 9?
70-71°F 100.0%
68-69°F 4%
67°F or below 2%
72-73°F <1%
$2,043 Vol.
$2,043 Vol.
Sep 9, 2026
67°F or below
No
68-69°F
No
70-71°F
Yes
72-73°F
No
74-75°F
No
76-77°F
No
78-79°F
No
80-81°F
No
82-83°F
No
84-85°F
No
86°F or higher
No
70-71°F 100.0%
68-69°F 4%
67°F or below 2%
72-73°F <1%
$2,043 Vol.
$2,043 Vol.
Sep 9, 2026
67°F or below
$30 Vol.
No
68-69°F
$30 Vol.
No
70-71°F
$229 Vol.
Yes
72-73°F
$50 Vol.
No
74-75°F
$35 Vol.
No
76-77°F
$326 Vol.
No
78-79°F
$164 Vol.
No
80-81°F
$362 Vol.
No
82-83°F
$234 Vol.
No
84-85°F
$384 Vol.
No
86°F or higher
$200 Vol.
No
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 9 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.**Official observations from Chicago O'Hare Airport confirm a daily minimum of 71°F on September 9, 2026, aligning with the market's dominant 70-71°F outcome at 99% implied probability.** National Weather Service data recorded the low at 7:06 AM local time under conditions that included light rain and fog, following a maximum of 80°F later that afternoon—well above the 1991-2020 normal low of 60°F for the date. This result sits near the upper end of typical early-September ranges and far above historical daily records near 47°F. The strong trader consensus reflects verified station data rather than forecasts, with resolution hinging on the official NWS climatological summary. Scenarios that could challenge the outcome include any post hoc revision to the preliminary reading or use of an alternate station, though such adjustments remain unlikely given the clear observational record.
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 9 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 7, 2026, 3:29 AM ET
Volume
$2,043End Date
Sep 9, 2026Market Opened
Sep 7, 2026, 3:29 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=kordResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
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 9 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.**Official observations from Chicago O'Hare Airport confirm a daily minimum of 71°F on September 9, 2026, aligning with the market's dominant 70-71°F outcome at 99% implied probability.** National Weather Service data recorded the low at 7:06 AM local time under conditions that included light rain and fog, following a maximum of 80°F later that afternoon—well above the 1991-2020 normal low of 60°F for the date. This result sits near the upper end of typical early-September ranges and far above historical daily records near 47°F. The strong trader consensus reflects verified station data rather than forecasts, with resolution hinging on the official NWS climatological summary. Scenarios that could challenge the outcome include any post hoc revision to the preliminary reading or use of an alternate station, though such adjustments remain unlikely given the clear observational record.
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 9 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
$2,043End Date
Sep 9, 2026Market Opened
Sep 7, 2026, 3:29 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=kordResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
**Official observations from Chicago O'Hare Airport confirm a daily minimum of 71°F on September 9, 2026, aligning with the market's dominant 70-71°F outcome at 99% implied probability.** National Weather Service data recorded the low at 7:06 AM local time under conditions that included light rain and fog, following a maximum of 80°F later that afternoon—well above the 1991-2020 normal low of 60°F for the date. This result sits near the upper end of typical early-September ranges and far above historical daily records near 47°F. The strong trader consensus reflects verified station data rather than forecasts, with resolution hinging on the official NWS climatological summary. Scenarios that could challenge the outcome include any post hoc revision to the preliminary reading or use of an alternate station, though such adjustments remain unlikely given the clear observational record.
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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