The National Weather Service's latest forecast for Chicago O'Hare International Airport projects a daytime high of 76-80°F on April 13, driving trader consensus to a 97.7% implied probability for 74°F or higher, well above the mid-April climatological normal of 58°F. This positioning reflects model consensus on a persistent upper-level ridge ushering unseasonably warm air masses from the south, with light winds and partial sunshine supporting peak heating in the afternoon. Official observations confirm morning temperatures already trending warmer than recent days. Realistic challenges include increased cloud cover or convective thunderstorms—forecast at 40% chance after 2 p.m.—potentially capping highs below 74°F if they develop early or intensify, though ensemble models show low odds of such suppression before evening resolution. Updated guidance expected by midday.
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 April 13?
Highest temperature in Chicago on April 13?
74°F or higher 95.3%
72-73°F 2.9%
66-67°F <1%
68-69°F <1%
$162,286 Vol.
$162,286 Vol.
66-67°F
<1%
68-69°F
<1%
70-71°F
<1%
72-73°F
3%
74°F or higher
95%
74°F or higher 95.3%
72-73°F 2.9%
66-67°F <1%
68-69°F <1%
$162,286 Vol.
$162,286 Vol.
66-67°F
<1%
68-69°F
<1%
70-71°F
<1%
72-73°F
3%
74°F or higher
95%
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: Apr 9, 2026, 12:09 AM ET
Resolution Source
https://www.wunderground.com/history/daily/us/il/chicago/KORDResolver
0x69c47De9D...Outcome proposed: No
Dispute window
Final
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.
Resolution Source
https://www.wunderground.com/history/daily/us/il/chicago/KORDResolver
0x69c47De9D...Outcome proposed: No
Dispute window
Final
The National Weather Service's latest forecast for Chicago O'Hare International Airport projects a daytime high of 76-80°F on April 13, driving trader consensus to a 97.7% implied probability for 74°F or higher, well above the mid-April climatological normal of 58°F. This positioning reflects model consensus on a persistent upper-level ridge ushering unseasonably warm air masses from the south, with light winds and partial sunshine supporting peak heating in the afternoon. Official observations confirm morning temperatures already trending warmer than recent days. Realistic challenges include increased cloud cover or convective thunderstorms—forecast at 40% chance after 2 p.m.—potentially capping highs below 74°F if they develop early or intensify, though ensemble models show low odds of such suppression before evening resolution. Updated guidance expected by midday.
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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