Forecast models from the National Weather Service and private sources indicate a high near 70°F for San Francisco on August 18, driven by persistent marine layer influence and moderate westerly onshore flow that limits inland warming. This keeps coastal readings several degrees below typical summer peaks inland, with historical August averages around 67–70°F at official stations like KSFO. Trader consensus clustering on the 70–73°F brackets reflects these conditions while acknowledging model spread from subtle variations in wind strength or cloud cover that could push the daily maximum a degree or two higher or lower. Updated short-range guidance expected overnight will refine the exact threshold ahead of resolution.
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 18?
Highest temperature in San Francisco on August 18?
72-73°F 28%
70-71°F 20%
74-75°F 19%
68-69°F 15%
NEW
NEW
Aug 18, 2026
67°F or below
7%
68-69°F
15%
70-71°F
20%
72-73°F
28%
74-75°F
19%
76-77°F
2%
78-79°F
6%
80-81°F
1%
82-83°F
<1%
84-85°F
<1%
86°F or higher
<1%
72-73°F 28%
70-71°F 20%
74-75°F 19%
68-69°F 15%
NEW
NEW
Aug 18, 2026
67°F or below
$254 Vol.
7%
68-69°F
$88 Vol.
15%
70-71°F
$1,161 Vol.
20%
72-73°F
$161 Vol.
28%
74-75°F
$252 Vol.
19%
76-77°F
$734 Vol.
2%
78-79°F
$107 Vol.
6%
80-81°F
$136 Vol.
1%
82-83°F
$165 Vol.
<1%
84-85°F
$267 Vol.
<1%
86°F or higher
$110 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 18 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.Forecast models from the National Weather Service and private sources indicate a high near 70°F for San Francisco on August 18, driven by persistent marine layer influence and moderate westerly onshore flow that limits inland warming. This keeps coastal readings several degrees below typical summer peaks inland, with historical August averages around 67–70°F at official stations like KSFO. Trader consensus clustering on the 70–73°F brackets reflects these conditions while acknowledging model spread from subtle variations in wind strength or cloud cover that could push the daily maximum a degree or two higher or lower. Updated short-range guidance expected overnight will refine the exact threshold ahead of resolution.
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 18 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 18 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 16, 2026, 9:57 PM ET
Volume
$3,435End Date
Aug 18, 2026Market Opened
Aug 16, 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 18 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.Forecast models from the National Weather Service and private sources indicate a high near 70°F for San Francisco on August 18, driven by persistent marine layer influence and moderate westerly onshore flow that limits inland warming. This keeps coastal readings several degrees below typical summer peaks inland, with historical August averages around 67–70°F at official stations like KSFO. Trader consensus clustering on the 70–73°F brackets reflects these conditions while acknowledging model spread from subtle variations in wind strength or cloud cover that could push the daily maximum a degree or two higher or lower. Updated short-range guidance expected overnight will refine the exact threshold ahead of resolution.
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 18 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 18 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
$3,435End Date
Aug 18, 2026Market Opened
Aug 16, 2026, 9:57 PM ETResolution Source
https://www.wunderground.com/history/daily/us/ca/san-francisco/KSFOResolver
0x69c47De9D...Forecast models from the National Weather Service and private sources indicate a high near 70°F for San Francisco on August 18, driven by persistent marine layer influence and moderate westerly onshore flow that limits inland warming. This keeps coastal readings several degrees below typical summer peaks inland, with historical August averages around 67–70°F at official stations like KSFO. Trader consensus clustering on the 70–73°F brackets reflects these conditions while acknowledging model spread from subtle variations in wind strength or cloud cover that could push the daily maximum a degree or two higher or lower. Updated short-range guidance expected overnight will refine the exact threshold ahead of resolution.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · Updated
Beware of external links.
Beware of external links.
Frequently Asked Questions