Recent forecasts from the National Weather Service and models indicate a frontal system approaching Chicago on September 9, bringing increased cloud cover, morning showers, and an 80% precipitation chance that limits daytime heating. Southwest winds of 10-15 mph and high humidity support highs in the low-to-mid 80s, aligning with the market's leading 80-81°F (35%) and 82-83°F (25.5%) bins. Early September heat, with multiple days above 90°F, has given way to this moderating pattern, while historical September 9 averages near 79°F provide context. Updated NWS guidance and model runs over the next 48 hours will refine steering and intensity details 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. · UpdatedHighest temperature in Chicago on September 9?
Highest temperature in Chicago on September 9?
80-81°F 35%
82-83°F 26%
78-79°F 22%
76-77°F 11%
NEW
NEW
Sep 9, 2026
75°F or below
5%
76-77°F
11%
78-79°F
22%
80-81°F
35%
82-83°F
26%
84-85°F
9%
86-87°F
7%
88-89°F
3%
90-91°F
3%
92-93°F
3%
94°F or higher
3%
80-81°F 35%
82-83°F 26%
78-79°F 22%
76-77°F 11%
NEW
NEW
Sep 9, 2026
75°F or below
$0 Vol.
5%
76-77°F
$6 Vol.
11%
78-79°F
$0 Vol.
22%
80-81°F
$39 Vol.
35%
82-83°F
$42 Vol.
26%
84-85°F
$37 Vol.
9%
86-87°F
$0 Vol.
7%
88-89°F
$0 Vol.
3%
90-91°F
$0 Vol.
3%
92-93°F
$0 Vol.
3%
94°F or higher
$0 Vol.
3%
This market will resolve to the temperature range that contains the highest 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 highest 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 forecasts from the National Weather Service and models indicate a frontal system approaching Chicago on September 9, bringing increased cloud cover, morning showers, and an 80% precipitation chance that limits daytime heating. Southwest winds of 10-15 mph and high humidity support highs in the low-to-mid 80s, aligning with the market's leading 80-81°F (35%) and 82-83°F (25.5%) bins. Early September heat, with multiple days above 90°F, has given way to this moderating pattern, while historical September 9 averages near 79°F provide context. Updated NWS guidance and model runs over the next 48 hours will refine steering and intensity details ahead of market resolution.
This market will resolve to the temperature range that contains the highest 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 highest 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 highest 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, 3:56 AM ET
Volume
$124End Date
Sep 9, 2026Market Opened
Sep 7, 2026, 3:56 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=kordResolver
0x69c47De9D...This market will resolve to the temperature range that contains the highest 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 highest 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 forecasts from the National Weather Service and models indicate a frontal system approaching Chicago on September 9, bringing increased cloud cover, morning showers, and an 80% precipitation chance that limits daytime heating. Southwest winds of 10-15 mph and high humidity support highs in the low-to-mid 80s, aligning with the market's leading 80-81°F (35%) and 82-83°F (25.5%) bins. Early September heat, with multiple days above 90°F, has given way to this moderating pattern, while historical September 9 averages near 79°F provide context. Updated NWS guidance and model runs over the next 48 hours will refine steering and intensity details ahead of market resolution.
This market will resolve to the temperature range that contains the highest 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 highest 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 highest 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
$124End Date
Sep 9, 2026Market Opened
Sep 7, 2026, 3:56 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=kordResolver
0x69c47De9D...Recent forecasts from the National Weather Service and models indicate a frontal system approaching Chicago on September 9, bringing increased cloud cover, morning showers, and an 80% precipitation chance that limits daytime heating. Southwest winds of 10-15 mph and high humidity support highs in the low-to-mid 80s, aligning with the market's leading 80-81°F (35%) and 82-83°F (25.5%) bins. Early September heat, with multiple days above 90°F, has given way to this moderating pattern, while historical September 9 averages near 79°F provide context. Updated NWS guidance and model runs over the next 48 hours will refine steering and intensity details 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
Beware of external links.
Beware of external links.
Frequently Asked Questions