Current forecasts from NOAA-aligned models and regional analyses point to an overnight low in Seattle on September 18 around 52–54°F, driven by clear to partly cloudy skies, light southerly winds, and radiative cooling under stable high pressure as the region transitions toward autumn. Marine air influence from the Puget Sound moderates extremes, while dew point trends near 50–52°F limit further drops. The tight market split between 52–53°F and 54–55°F bins (each at 20%) reflects model spread in minimum temperature resolution, with minor differences in cloud timing or boundary-layer mixing able to shift the exact low by 1–2°F. Historical September 18 averages near 52.6°F provide climatological context for these probabilities.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedLowest temperature in Seattle on September 18?
Lowest temperature in Seattle on September 18?
52-53°F 40%
54-55°F 40%
50-51°F 19%
56-57°F 19%
NEW
NEW
Sep 18, 2026
45°F or below
5%
46-47°F
7%
48-49°F
11%
50-51°F
19%
52-53°F
40%
54-55°F
40%
56-57°F
19%
58-59°F
11%
60-61°F
7%
62-63°F
5%
64°F or higher
5%
52-53°F 40%
54-55°F 40%
50-51°F 19%
56-57°F 19%
NEW
NEW
Sep 18, 2026
45°F or below
$0 Vol.
5%
46-47°F
$0 Vol.
7%
48-49°F
$0 Vol.
11%
50-51°F
$0 Vol.
19%
52-53°F
$0 Vol.
40%
54-55°F
$0 Vol.
40%
56-57°F
$0 Vol.
19%
58-59°F
$0 Vol.
11%
60-61°F
$0 Vol.
7%
62-63°F
$0 Vol.
5%
64°F or higher
$0 Vol.
5%
This market will resolve to the temperature range that contains the lowest temperature recorded by NOAA at the Seattle-Tacoma International Airport Station in degrees Fahrenheit on 18 Sep '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=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.Current forecasts from NOAA-aligned models and regional analyses point to an overnight low in Seattle on September 18 around 52–54°F, driven by clear to partly cloudy skies, light southerly winds, and radiative cooling under stable high pressure as the region transitions toward autumn. Marine air influence from the Puget Sound moderates extremes, while dew point trends near 50–52°F limit further drops. The tight market split between 52–53°F and 54–55°F bins (each at 20%) reflects model spread in minimum temperature resolution, with minor differences in cloud timing or boundary-layer mixing able to shift the exact low by 1–2°F. Historical September 18 averages near 52.6°F provide climatological context for these probabilities.
This market will resolve to the temperature range that contains the lowest temperature recorded by NOAA at the Seattle-Tacoma International Airport Station in degrees Fahrenheit on 18 Sep '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=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 lowest 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 16, 2026, 7:29 AM ET
Volume
$0End Date
Sep 18, 2026Market Opened
Sep 16, 2026, 7:29 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=kseaResolver
0x69c47De9D...This market will resolve to the temperature range that contains the lowest temperature recorded by NOAA at the Seattle-Tacoma International Airport Station in degrees Fahrenheit on 18 Sep '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=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.Current forecasts from NOAA-aligned models and regional analyses point to an overnight low in Seattle on September 18 around 52–54°F, driven by clear to partly cloudy skies, light southerly winds, and radiative cooling under stable high pressure as the region transitions toward autumn. Marine air influence from the Puget Sound moderates extremes, while dew point trends near 50–52°F limit further drops. The tight market split between 52–53°F and 54–55°F bins (each at 20%) reflects model spread in minimum temperature resolution, with minor differences in cloud timing or boundary-layer mixing able to shift the exact low by 1–2°F. Historical September 18 averages near 52.6°F provide climatological context for these probabilities.
This market will resolve to the temperature range that contains the lowest temperature recorded by NOAA at the Seattle-Tacoma International Airport Station in degrees Fahrenheit on 18 Sep '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=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 lowest 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
$0End Date
Sep 18, 2026Market Opened
Sep 16, 2026, 7:29 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=kseaResolver
0x69c47De9D...Current forecasts from NOAA-aligned models and regional analyses point to an overnight low in Seattle on September 18 around 52–54°F, driven by clear to partly cloudy skies, light southerly winds, and radiative cooling under stable high pressure as the region transitions toward autumn. Marine air influence from the Puget Sound moderates extremes, while dew point trends near 50–52°F limit further drops. The tight market split between 52–53°F and 54–55°F bins (each at 20%) reflects model spread in minimum temperature resolution, with minor differences in cloud timing or boundary-layer mixing able to shift the exact low by 1–2°F. Historical September 18 averages near 52.6°F provide climatological context for these probabilities.
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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