Recent National Weather Service and local forecasts project a daily high in Denver near 81–83°F on September 18, with scattered afternoon thunderstorms likely after partly sunny conditions. Thunderstorm timing and coverage introduce key uncertainty, as early or widespread convection could suppress peak temperatures by limiting solar heating, while delayed activity might allow readings to reach the mid-80s. This aligns with the market’s closely bunched probabilities for 80–85°F outcomes. The setup occurs against a seasonal baseline where mid-September highs average near 78°F, and current model consensus shows modest warming ahead of the unsettled pattern. Updated NWS briefings and afternoon observations will provide the final resolution data.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedHighest temperature in Denver on September 18?
80-81°F 40%
82-83°F 40%
84-85°F 38%
78-79°F 10%
71°F or below
5%
72-73°F
5%
74-75°F
5%
76-77°F
7%
78-79°F
10%
80-81°F
40%
82-83°F
40%
84-85°F
38%
86-87°F
6%
88-89°F
8%
90°F or higher
6%
80-81°F 40%
82-83°F 40%
84-85°F 38%
78-79°F 10%
71°F or below
5%
72-73°F
5%
74-75°F
5%
76-77°F
7%
78-79°F
10%
80-81°F
40%
82-83°F
40%
84-85°F
38%
86-87°F
6%
88-89°F
8%
90°F or higher
6%
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=kbkf
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 16, 2026, 2:56 AM ET
Resolution Source
https://www.weather.gov/wrh/timeseries?site=kbkfResolver
0x69c47De9D...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=kbkf
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.
Resolution Source
https://www.weather.gov/wrh/timeseries?site=kbkfResolver
0x69c47De9D...Recent National Weather Service and local forecasts project a daily high in Denver near 81–83°F on September 18, with scattered afternoon thunderstorms likely after partly sunny conditions. Thunderstorm timing and coverage introduce key uncertainty, as early or widespread convection could suppress peak temperatures by limiting solar heating, while delayed activity might allow readings to reach the mid-80s. This aligns with the market’s closely bunched probabilities for 80–85°F outcomes. The setup occurs against a seasonal baseline where mid-September highs average near 78°F, and current model consensus shows modest warming ahead of the unsettled pattern. Updated NWS briefings and afternoon observations will provide the final resolution data.
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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