Seattle's September 20 maximum temperature market reflects tight trader consensus around 68–71°F amid stable late-summer conditions. National Weather Service and multiple forecast models indicate a typical marine-influenced pattern: morning patchy fog or low stratus under light northerly flow, followed by partial afternoon clearing with highs in the upper 60s to low 70s. North winds of 5–10 mph and the moderating effect of the Pacific Ocean limit diurnal warming, consistent with the 1991–2020 climatological average high of 69.2°F. No strong high-pressure ridge or offshore flow is expected to push temperatures into the mid-70s, while model agreement keeps lower 60s outcomes unlikely. Resolution hinges on the official NWS Seattle-Tacoma International Airport daily maximum.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedHighest temperature in Seattle on September 20?
Highest temperature in Seattle on September 20?
70-71°F 28%
68-69°F 23%
66-67°F 16%
72-73°F 13%
NEW
NEW
Sep 20, 2026
63°F or below
1%
64-65°F
13%
66-67°F
16%
68-69°F
23%
70-71°F
28%
72-73°F
13%
74-75°F
7%
76-77°F
2%
78-79°F
<1%
80-81°F
<1%
82°F or higher
<1%
70-71°F 28%
68-69°F 23%
66-67°F 16%
72-73°F 13%
NEW
NEW
Sep 20, 2026
63°F or below
$449 Vol.
1%
64-65°F
$590 Vol.
13%
66-67°F
$566 Vol.
16%
68-69°F
$398 Vol.
23%
70-71°F
$510 Vol.
28%
72-73°F
$267 Vol.
13%
74-75°F
$398 Vol.
7%
76-77°F
$196 Vol.
2%
78-79°F
$301 Vol.
<1%
80-81°F
$135 Vol.
<1%
82°F or higher
$125 Vol.
<1%
This market will resolve to the temperature range that contains the highest temperature recorded by NOAA at the Seattle-Tacoma International Airport Station in degrees Fahrenheit on 20 Sep '26.
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=ksea
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.Seattle's September 20 maximum temperature market reflects tight trader consensus around 68–71°F amid stable late-summer conditions. National Weather Service and multiple forecast models indicate a typical marine-influenced pattern: morning patchy fog or low stratus under light northerly flow, followed by partial afternoon clearing with highs in the upper 60s to low 70s. North winds of 5–10 mph and the moderating effect of the Pacific Ocean limit diurnal warming, consistent with the 1991–2020 climatological average high of 69.2°F. No strong high-pressure ridge or offshore flow is expected to push temperatures into the mid-70s, while model agreement keeps lower 60s outcomes unlikely. Resolution hinges on the official NWS Seattle-Tacoma International Airport daily maximum.
This market will resolve to the temperature range that contains the highest temperature recorded by NOAA at the Seattle-Tacoma International Airport Station in degrees Fahrenheit on 20 Sep '26.
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=ksea
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.
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=ksea
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 18, 2026, 7:55 AM ET
Volume
$3,936End Date
Sep 20, 2026Market Opened
Sep 18, 2026, 7:55 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=kseaResolver
0x69c47De9D...This market will resolve to the temperature range that contains the highest temperature recorded by NOAA at the Seattle-Tacoma International Airport Station in degrees Fahrenheit on 20 Sep '26.
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=ksea
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.Seattle's September 20 maximum temperature market reflects tight trader consensus around 68–71°F amid stable late-summer conditions. National Weather Service and multiple forecast models indicate a typical marine-influenced pattern: morning patchy fog or low stratus under light northerly flow, followed by partial afternoon clearing with highs in the upper 60s to low 70s. North winds of 5–10 mph and the moderating effect of the Pacific Ocean limit diurnal warming, consistent with the 1991–2020 climatological average high of 69.2°F. No strong high-pressure ridge or offshore flow is expected to push temperatures into the mid-70s, while model agreement keeps lower 60s outcomes unlikely. Resolution hinges on the official NWS Seattle-Tacoma International Airport daily maximum.
This market will resolve to the temperature range that contains the highest temperature recorded by NOAA at the Seattle-Tacoma International Airport Station in degrees Fahrenheit on 20 Sep '26.
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=ksea
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.
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=ksea
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.
Volume
$3,936End Date
Sep 20, 2026Market Opened
Sep 18, 2026, 7:55 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=kseaResolver
0x69c47De9D...Seattle's September 20 maximum temperature market reflects tight trader consensus around 68–71°F amid stable late-summer conditions. National Weather Service and multiple forecast models indicate a typical marine-influenced pattern: morning patchy fog or low stratus under light northerly flow, followed by partial afternoon clearing with highs in the upper 60s to low 70s. North winds of 5–10 mph and the moderating effect of the Pacific Ocean limit diurnal warming, consistent with the 1991–2020 climatological average high of 69.2°F. No strong high-pressure ridge or offshore flow is expected to push temperatures into the mid-70s, while model agreement keeps lower 60s outcomes unlikely. Resolution hinges on the official NWS Seattle-Tacoma International Airport daily maximum.
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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