National Weather Service observations at San Francisco International Airport recorded a maximum of 68°F on August 20, aligning precisely with the 68-69°F bin that now holds full market-implied probability. Persistent onshore westerly flow and a compressed marine layer kept daytime warming limited despite regional inland heat, consistent with typical August climatology where coastal highs average near 67°F. Ensemble model guidance showed minimal day-to-day variability and no significant offshore flow or marine-layer deepening capable of shifting readings outside the narrow 66–70°F window. Only an unverified station anomaly or revision to official data could realistically alter resolution, though such adjustments remain rare given NWS verification protocols.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedHighest temperature in San Francisco on August 20?
Highest temperature in San Francisco on August 20?
68-69°F 100.0%
59°F or below <1%
60-61°F <1%
62-63°F <1%
$38,991 Vol.
$38,991 Vol.
Aug 20, 2026
59°F or below
<1%
60-61°F
<1%
62-63°F
<1%
64-65°F
<1%
66-67°F
<1%
68-69°F
100%
70-71°F
<1%
72-73°F
<1%
74-75°F
<1%
76-77°F
<1%
78°F or higher
<1%
68-69°F 100.0%
59°F or below <1%
60-61°F <1%
62-63°F <1%
$38,991 Vol.
$38,991 Vol.
Aug 20, 2026
59°F or below
$1,258 Vol.
<1%
60-61°F
$2,311 Vol.
<1%
62-63°F
$3,587 Vol.
<1%
64-65°F
$3,527 Vol.
<1%
66-67°F
$6,525 Vol.
<1%
68-69°F
$7,384 Vol.
100%
70-71°F
$6,548 Vol.
<1%
72-73°F
$3,176 Vol.
<1%
74-75°F
$3,591 Vol.
<1%
76-77°F
$661 Vol.
<1%
78°F or higher
$425 Vol.
<1%
This market will resolve based on the highest 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 highest temperature recorded at the San Francisco International Airport Station in degrees Fahrenheit on 20 Aug '26.
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day for the San Francisco International Airport Station, available here: https://www.wunderground.com/history/daily/us/ca/san-francisco/KSFO.
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.National Weather Service observations at San Francisco International Airport recorded a maximum of 68°F on August 20, aligning precisely with the 68-69°F bin that now holds full market-implied probability. Persistent onshore westerly flow and a compressed marine layer kept daytime warming limited despite regional inland heat, consistent with typical August climatology where coastal highs average near 67°F. Ensemble model guidance showed minimal day-to-day variability and no significant offshore flow or marine-layer deepening capable of shifting readings outside the narrow 66–70°F window. Only an unverified station anomaly or revision to official data could realistically alter resolution, though such adjustments remain rare given NWS verification protocols.
This market will resolve based on the highest 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 highest temperature recorded at the San Francisco International Airport Station in degrees Fahrenheit on 20 Aug '26.
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day for the San Francisco International Airport Station, available here: https://www.wunderground.com/history/daily/us/ca/san-francisco/KSFO.
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 highest temperature recorded at the San Francisco International Airport Station in degrees Fahrenheit on 20 Aug '26.
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day for the San Francisco International Airport Station, available here: https://www.wunderground.com/history/daily/us/ca/san-francisco/KSFO.
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 18, 2026, 9:57 PM ET
Volume
$38,991End Date
Aug 20, 2026Market Opened
Aug 18, 2026, 9:57 PM ETResolution Source
https://www.wunderground.com/history/daily/us/ca/san-francisco/KSFOResolver
0x69c47De9D...This market will resolve based on the highest 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 highest temperature recorded at the San Francisco International Airport Station in degrees Fahrenheit on 20 Aug '26.
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day for the San Francisco International Airport Station, available here: https://www.wunderground.com/history/daily/us/ca/san-francisco/KSFO.
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.National Weather Service observations at San Francisco International Airport recorded a maximum of 68°F on August 20, aligning precisely with the 68-69°F bin that now holds full market-implied probability. Persistent onshore westerly flow and a compressed marine layer kept daytime warming limited despite regional inland heat, consistent with typical August climatology where coastal highs average near 67°F. Ensemble model guidance showed minimal day-to-day variability and no significant offshore flow or marine-layer deepening capable of shifting readings outside the narrow 66–70°F window. Only an unverified station anomaly or revision to official data could realistically alter resolution, though such adjustments remain rare given NWS verification protocols.
This market will resolve based on the highest 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 highest temperature recorded at the San Francisco International Airport Station in degrees Fahrenheit on 20 Aug '26.
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day for the San Francisco International Airport Station, available here: https://www.wunderground.com/history/daily/us/ca/san-francisco/KSFO.
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 highest temperature recorded at the San Francisco International Airport Station in degrees Fahrenheit on 20 Aug '26.
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day for the San Francisco International Airport Station, available here: https://www.wunderground.com/history/daily/us/ca/san-francisco/KSFO.
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
$38,991End Date
Aug 20, 2026Market Opened
Aug 18, 2026, 9:57 PM ETResolution Source
https://www.wunderground.com/history/daily/us/ca/san-francisco/KSFOResolver
0x69c47De9D...National Weather Service observations at San Francisco International Airport recorded a maximum of 68°F on August 20, aligning precisely with the 68-69°F bin that now holds full market-implied probability. Persistent onshore westerly flow and a compressed marine layer kept daytime warming limited despite regional inland heat, consistent with typical August climatology where coastal highs average near 67°F. Ensemble model guidance showed minimal day-to-day variability and no significant offshore flow or marine-layer deepening capable of shifting readings outside the narrow 66–70°F window. Only an unverified station anomaly or revision to official data could realistically alter resolution, though such adjustments remain rare given NWS verification protocols.
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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