Official forecasts from the National Weather Service and models project Chicago's overnight low on August 27 near 66–70°F under mostly clear skies and light northeast winds, aligning with the tightly clustered market odds around 60–69°F. Mid-summer radiative cooling is moderated by Lake Michigan's thermal inertia and residual humidity, preventing deeper drops despite calm conditions favoring surface heat loss. Historical averages near 65°F and recent stable high-pressure patterns support this range, while slight model spreads in boundary-layer mixing and lake-breeze timing create the narrow uncertainty bands traders are pricing. Updated NWS guidance and hourly observations will refine resolution criteria as the minimum is recorded.
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 August 27?
Lowest temperature in Chicago on August 27?
64-65°F 40%
60-61°F 39%
62-63°F 12%
55°F or below <1%
NEW
NEW
Aug 27, 2026
55°F or below
<1%
56-57°F
<1%
58-59°F
<1%
60-61°F
39%
62-63°F
12%
64-65°F
40%
66-67°F
39%
68-69°F
39%
70-71°F
<1%
72-73°F
<1%
74°F or higher
<1%
64-65°F 40%
60-61°F 39%
62-63°F 12%
55°F or below <1%
NEW
NEW
Aug 27, 2026
55°F or below
$57 Vol.
<1%
56-57°F
$162 Vol.
<1%
58-59°F
$85 Vol.
<1%
60-61°F
$0 Vol.
39%
62-63°F
$0 Vol.
12%
64-65°F
$0 Vol.
40%
66-67°F
$35 Vol.
39%
68-69°F
$12 Vol.
39%
70-71°F
$112 Vol.
<1%
72-73°F
$55 Vol.
<1%
74°F or higher
$585 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 27 Aug '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 is unavailable or missing for the observation period, Weather Underground will be used as the secondary resolution source.
To toggle between Fahrenheit and Celsius, click the "Switch to US Units w/ kts" button until the relevant table displays °F.
This market can not resolve until the first data point for the following date has been published on the resolution source.
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 forecasts from the National Weather Service and models project Chicago's overnight low on August 27 near 66–70°F under mostly clear skies and light northeast winds, aligning with the tightly clustered market odds around 60–69°F. Mid-summer radiative cooling is moderated by Lake Michigan's thermal inertia and residual humidity, preventing deeper drops despite calm conditions favoring surface heat loss. Historical averages near 65°F and recent stable high-pressure patterns support this range, while slight model spreads in boundary-layer mixing and lake-breeze timing create the narrow uncertainty bands traders are pricing. Updated NWS guidance and hourly observations will refine resolution criteria as the minimum is recorded.
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 27 Aug '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 is unavailable or missing for the observation period, Weather Underground will be used as the secondary resolution source.
To toggle between Fahrenheit and Celsius, click the "Switch to US Units w/ kts" button until the relevant table displays °F.
This market can not resolve until the first data point for the following date has been published on the resolution source.
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 is unavailable or missing for the observation period, Weather Underground will be used as the secondary resolution source.
To toggle between Fahrenheit and Celsius, click the "Switch to US Units w/ kts" button until the relevant table displays °F.
This market can not resolve until the first data point for the following date has been published on the resolution source.
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: Aug 25, 2026, 9:29 PM ET
Volume
$1,103End Date
Aug 27, 2026Market Opened
Aug 25, 2026, 9:29 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 27 Aug '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 is unavailable or missing for the observation period, Weather Underground will be used as the secondary resolution source.
To toggle between Fahrenheit and Celsius, click the "Switch to US Units w/ kts" button until the relevant table displays °F.
This market can not resolve until the first data point for the following date has been published on the resolution source.
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 forecasts from the National Weather Service and models project Chicago's overnight low on August 27 near 66–70°F under mostly clear skies and light northeast winds, aligning with the tightly clustered market odds around 60–69°F. Mid-summer radiative cooling is moderated by Lake Michigan's thermal inertia and residual humidity, preventing deeper drops despite calm conditions favoring surface heat loss. Historical averages near 65°F and recent stable high-pressure patterns support this range, while slight model spreads in boundary-layer mixing and lake-breeze timing create the narrow uncertainty bands traders are pricing. Updated NWS guidance and hourly observations will refine resolution criteria as the minimum is recorded.
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 27 Aug '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 is unavailable or missing for the observation period, Weather Underground will be used as the secondary resolution source.
To toggle between Fahrenheit and Celsius, click the "Switch to US Units w/ kts" button until the relevant table displays °F.
This market can not resolve until the first data point for the following date has been published on the resolution source.
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 is unavailable or missing for the observation period, Weather Underground will be used as the secondary resolution source.
To toggle between Fahrenheit and Celsius, click the "Switch to US Units w/ kts" button until the relevant table displays °F.
This market can not resolve until the first data point for the following date has been published on the resolution source.
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
$1,103End Date
Aug 27, 2026Market Opened
Aug 25, 2026, 9:29 PM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=kordResolver
0x69c47De9D...Official forecasts from the National Weather Service and models project Chicago's overnight low on August 27 near 66–70°F under mostly clear skies and light northeast winds, aligning with the tightly clustered market odds around 60–69°F. Mid-summer radiative cooling is moderated by Lake Michigan's thermal inertia and residual humidity, preventing deeper drops despite calm conditions favoring surface heat loss. Historical averages near 65°F and recent stable high-pressure patterns support this range, while slight model spreads in boundary-layer mixing and lake-breeze timing create the narrow uncertainty bands traders are pricing. Updated NWS guidance and hourly observations will refine resolution criteria as the minimum is recorded.
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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