Current National Weather Service forecasts and real-time observations confirm Chicago will reach a daytime high well above 64°F on May 17, driven by a stable high-pressure ridge and southerly flow transporting milder air from the Gulf region. This setup favors clear skies and reduced cloud cover, allowing maximum solar heating consistent with climatological norms of 70–71°F for mid-May. Model consensus from NOAA shows minimal variability in the expected peak, with no significant cold fronts or precipitation expected to suppress temperatures. Trader consensus at 100% implied probability for the 64°F or higher outcome reflects this strong agreement, though an unexpected northerly shift in steering winds could introduce cooler air and lower the high by a few degrees before sunset.
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 May 17?
64°F or higher 100.0%
45°F or below <1%
46-47°F <1%
48-49°F <1%
$56,727 Vol.
$56,727 Vol.
45°F or below
<1%
46-47°F
<1%
48-49°F
<1%
50-51°F
<1%
52-53°F
<1%
54-55°F
<1%
56-57°F
<1%
58-59°F
<1%
60-61°F
<1%
62-63°F
<1%
64°F or higher
100%
64°F or higher 100.0%
45°F or below <1%
46-47°F <1%
48-49°F <1%
$56,727 Vol.
$56,727 Vol.
45°F or below
<1%
46-47°F
<1%
48-49°F
<1%
50-51°F
<1%
52-53°F
<1%
54-55°F
<1%
56-57°F
<1%
58-59°F
<1%
60-61°F
<1%
62-63°F
<1%
64°F or higher
100%
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day by the Forecast for the Chicago O'Hare Intl Airport Station once information is finalized, available here: https://www.wunderground.com/history/daily/us/il/chicago/KORD.
To toggle between Fahrenheit and Celsius, click the gear icon next to the search bar and switch the Temperature setting between °F and °C.
This market can not resolve to "Yes" until all data for this date has been finalized.
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.
Any revisions to temperatures recorded after data is finalized for this market's timeframe will not be considered for this market's resolution.
Market Opened: May 15, 2026, 12:04 AM ET
Resolution Source
https://www.wunderground.com/history/daily/us/il/chicago/KORDThe resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day by the Forecast for the Chicago O'Hare Intl Airport Station once information is finalized, available here: https://www.wunderground.com/history/daily/us/il/chicago/KORD.
To toggle between Fahrenheit and Celsius, click the gear icon next to the search bar and switch the Temperature setting between °F and °C.
This market can not resolve to "Yes" until all data for this date has been finalized.
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.
Any revisions to temperatures recorded after data is finalized for this market's timeframe will not be considered for this market's resolution.
Resolution Source
https://www.wunderground.com/history/daily/us/il/chicago/KORDCurrent National Weather Service forecasts and real-time observations confirm Chicago will reach a daytime high well above 64°F on May 17, driven by a stable high-pressure ridge and southerly flow transporting milder air from the Gulf region. This setup favors clear skies and reduced cloud cover, allowing maximum solar heating consistent with climatological norms of 70–71°F for mid-May. Model consensus from NOAA shows minimal variability in the expected peak, with no significant cold fronts or precipitation expected to suppress temperatures. Trader consensus at 100% implied probability for the 64°F or higher outcome reflects this strong agreement, though an unexpected northerly shift in steering winds could introduce cooler air and lower the high by a few degrees before sunset.
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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