Current National Weather Service forecasts and model runs position overnight lows for Seattle near 57–60°F on August 21, aligning with the market’s leading bins at 56–61°F. Marine air from Puget Sound and increasing cloud cover limit radiative cooling after a clearer preceding night, while light winds reduce mixing that could otherwise elevate minima. Historical climatology shows an average low of 56.4°F for the date, with recent years often recording 53–58°F under similar late-summer patterns. Traders appear to weigh these official guidance thresholds and the modest chance of showers against typical variability in urban heat-island effects, keeping probabilities concentrated in the narrow 56–61°F range as the day’s minimum is realized.
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 August 21?
Lowest temperature in Seattle on August 21?
58-59°F 53%
56-57°F 28%
62-63°F 28%
54-55°F 11%
NEW
NEW
Aug 21, 2026
49°F or below
<1%
50-51°F
6%
52-53°F
3%
54-55°F
11%
56-57°F
29%
58-59°F
41%
60-61°F
29%
62-63°F
28%
64-65°F
8%
66-67°F
1%
68°F or higher
<1%
58-59°F 53%
56-57°F 28%
62-63°F 28%
54-55°F 11%
NEW
NEW
Aug 21, 2026
49°F or below
$35 Vol.
<1%
50-51°F
$31 Vol.
6%
52-53°F
$94 Vol.
3%
54-55°F
$0 Vol.
11%
56-57°F
$6 Vol.
29%
58-59°F
$19 Vol.
41%
60-61°F
$7 Vol.
29%
62-63°F
$1 Vol.
28%
64-65°F
$15 Vol.
8%
66-67°F
$38 Vol.
1%
68°F or higher
$43 Vol.
<1%
This market will resolve based on the lowest temperature recorded in the 'Daily Observations' table on Weather Underground, not the figure displayed in the 'Day High & Low' summary section; in the event of any discrepancy between the two, the Daily Observations table shall be the primary resolution source not the Day High & Low section.
This market will resolve to the temperature range that contains the lowest temperature recorded at the Seattle-Tacoma International Airport Station in degrees Fahrenheit on 21 Aug '26.
The resolution source for this market will be information from Wunderground, specifically the lowest temperature recorded for all times on this day for the Seattle-Tacoma International Airport Station, available here: https://www.wunderground.com/history/daily/us/wa/seatac/KSEA.
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 until the first data point for the following date has been published on the resolution source.
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 National Weather Service forecasts and model runs position overnight lows for Seattle near 57–60°F on August 21, aligning with the market’s leading bins at 56–61°F. Marine air from Puget Sound and increasing cloud cover limit radiative cooling after a clearer preceding night, while light winds reduce mixing that could otherwise elevate minima. Historical climatology shows an average low of 56.4°F for the date, with recent years often recording 53–58°F under similar late-summer patterns. Traders appear to weigh these official guidance thresholds and the modest chance of showers against typical variability in urban heat-island effects, keeping probabilities concentrated in the narrow 56–61°F range as the day’s minimum is realized.
This market will resolve based on the lowest temperature recorded in the 'Daily Observations' table on Weather Underground, not the figure displayed in the 'Day High & Low' summary section; in the event of any discrepancy between the two, the Daily Observations table shall be the primary resolution source not the Day High & Low section.
This market will resolve to the temperature range that contains the lowest temperature recorded at the Seattle-Tacoma International Airport Station in degrees Fahrenheit on 21 Aug '26.
The resolution source for this market will be information from Wunderground, specifically the lowest temperature recorded for all times on this day for the Seattle-Tacoma International Airport Station, available here: https://www.wunderground.com/history/daily/us/wa/seatac/KSEA.
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 until the first data point for the following date has been published on the resolution source.
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.
This market will resolve to the temperature range that contains the lowest temperature recorded at the Seattle-Tacoma International Airport Station in degrees Fahrenheit on 21 Aug '26.
The resolution source for this market will be information from Wunderground, specifically the lowest temperature recorded for all times on this day for the Seattle-Tacoma International Airport Station, available here: https://www.wunderground.com/history/daily/us/wa/seatac/KSEA.
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 until the first data point for the following date has been published on the resolution source.
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: Aug 20, 2026, 1:28 PM ET
Volume
$289End Date
Aug 21, 2026Market Opened
Aug 20, 2026, 1:28 PM ETResolution Source
https://www.wunderground.com/history/daily/us/wa/seatac/KSEAResolver
0x69c47De9D...This market will resolve based on the lowest temperature recorded in the 'Daily Observations' table on Weather Underground, not the figure displayed in the 'Day High & Low' summary section; in the event of any discrepancy between the two, the Daily Observations table shall be the primary resolution source not the Day High & Low section.
This market will resolve to the temperature range that contains the lowest temperature recorded at the Seattle-Tacoma International Airport Station in degrees Fahrenheit on 21 Aug '26.
The resolution source for this market will be information from Wunderground, specifically the lowest temperature recorded for all times on this day for the Seattle-Tacoma International Airport Station, available here: https://www.wunderground.com/history/daily/us/wa/seatac/KSEA.
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 until the first data point for the following date has been published on the resolution source.
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 National Weather Service forecasts and model runs position overnight lows for Seattle near 57–60°F on August 21, aligning with the market’s leading bins at 56–61°F. Marine air from Puget Sound and increasing cloud cover limit radiative cooling after a clearer preceding night, while light winds reduce mixing that could otherwise elevate minima. Historical climatology shows an average low of 56.4°F for the date, with recent years often recording 53–58°F under similar late-summer patterns. Traders appear to weigh these official guidance thresholds and the modest chance of showers against typical variability in urban heat-island effects, keeping probabilities concentrated in the narrow 56–61°F range as the day’s minimum is realized.
This market will resolve based on the lowest temperature recorded in the 'Daily Observations' table on Weather Underground, not the figure displayed in the 'Day High & Low' summary section; in the event of any discrepancy between the two, the Daily Observations table shall be the primary resolution source not the Day High & Low section.
This market will resolve to the temperature range that contains the lowest temperature recorded at the Seattle-Tacoma International Airport Station in degrees Fahrenheit on 21 Aug '26.
The resolution source for this market will be information from Wunderground, specifically the lowest temperature recorded for all times on this day for the Seattle-Tacoma International Airport Station, available here: https://www.wunderground.com/history/daily/us/wa/seatac/KSEA.
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 until the first data point for the following date has been published on the resolution source.
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.
This market will resolve to the temperature range that contains the lowest temperature recorded at the Seattle-Tacoma International Airport Station in degrees Fahrenheit on 21 Aug '26.
The resolution source for this market will be information from Wunderground, specifically the lowest temperature recorded for all times on this day for the Seattle-Tacoma International Airport Station, available here: https://www.wunderground.com/history/daily/us/wa/seatac/KSEA.
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 until the first data point for the following date has been published on the resolution source.
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
$289End Date
Aug 21, 2026Market Opened
Aug 20, 2026, 1:28 PM ETResolution Source
https://www.wunderground.com/history/daily/us/wa/seatac/KSEAResolver
0x69c47De9D...Current National Weather Service forecasts and model runs position overnight lows for Seattle near 57–60°F on August 21, aligning with the market’s leading bins at 56–61°F. Marine air from Puget Sound and increasing cloud cover limit radiative cooling after a clearer preceding night, while light winds reduce mixing that could otherwise elevate minima. Historical climatology shows an average low of 56.4°F for the date, with recent years often recording 53–58°F under similar late-summer patterns. Traders appear to weigh these official guidance thresholds and the modest chance of showers against typical variability in urban heat-island effects, keeping probabilities concentrated in the narrow 56–61°F range as the day’s minimum is realized.
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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