National Weather Service and NOAA point forecasts for Chicago on August 27 show overnight lows in the mid-60s Fahrenheit under mostly clear skies and light northeast winds following any early showers, consistent with seasonal normals near 65°F. This places the expected minimum near 64–67°F, yet the closely matched market probabilities across wide bins reflect remaining uncertainty from short-range model spread on cloud cover, dew point trends, and urban heat island effects that could alter radiative cooling rates. Historical August extremes range from the upper 40s to mid-70s, underscoring how small forecast shifts in wind or humidity can move the realized low across multiple resolution thresholds before official observations finalize.
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 37%
62-63°F 32%
58-59°F 24%
60-61°F 24%
NEW
NEW
Aug 27, 2026
55°F or below
10%
56-57°F
15%
58-59°F
24%
60-61°F
24%
62-63°F
32%
64-65°F
37%
66-67°F
24%
68-69°F
24%
70-71°F
24%
72-73°F
2%
74°F or higher
20%
64-65°F 37%
62-63°F 32%
58-59°F 24%
60-61°F 24%
NEW
NEW
Aug 27, 2026
55°F or below
$32 Vol.
10%
56-57°F
$22 Vol.
15%
58-59°F
$0 Vol.
24%
60-61°F
$0 Vol.
24%
62-63°F
$0 Vol.
32%
64-65°F
$0 Vol.
37%
66-67°F
$0 Vol.
24%
68-69°F
$0 Vol.
24%
70-71°F
$0 Vol.
24%
72-73°F
$0 Vol.
2%
74°F or higher
$17 Vol.
20%
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.National Weather Service and NOAA point forecasts for Chicago on August 27 show overnight lows in the mid-60s Fahrenheit under mostly clear skies and light northeast winds following any early showers, consistent with seasonal normals near 65°F. This places the expected minimum near 64–67°F, yet the closely matched market probabilities across wide bins reflect remaining uncertainty from short-range model spread on cloud cover, dew point trends, and urban heat island effects that could alter radiative cooling rates. Historical August extremes range from the upper 40s to mid-70s, underscoring how small forecast shifts in wind or humidity can move the realized low across multiple resolution thresholds before official observations finalize.
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
$20End 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.National Weather Service and NOAA point forecasts for Chicago on August 27 show overnight lows in the mid-60s Fahrenheit under mostly clear skies and light northeast winds following any early showers, consistent with seasonal normals near 65°F. This places the expected minimum near 64–67°F, yet the closely matched market probabilities across wide bins reflect remaining uncertainty from short-range model spread on cloud cover, dew point trends, and urban heat island effects that could alter radiative cooling rates. Historical August extremes range from the upper 40s to mid-70s, underscoring how small forecast shifts in wind or humidity can move the realized low across multiple resolution thresholds before official observations finalize.
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
$20End Date
Aug 27, 2026Market Opened
Aug 25, 2026, 9:29 PM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=kordResolver
0x69c47De9D...National Weather Service and NOAA point forecasts for Chicago on August 27 show overnight lows in the mid-60s Fahrenheit under mostly clear skies and light northeast winds following any early showers, consistent with seasonal normals near 65°F. This places the expected minimum near 64–67°F, yet the closely matched market probabilities across wide bins reflect remaining uncertainty from short-range model spread on cloud cover, dew point trends, and urban heat island effects that could alter radiative cooling rates. Historical August extremes range from the upper 40s to mid-70s, underscoring how small forecast shifts in wind or humidity can move the realized low across multiple resolution thresholds before official observations finalize.
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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