Official National Weather Service observations recorded a minimum of 66°F at San Francisco International Airport on September 9, 2026, aligning precisely with the 66-67°F bin that commands over 95% implied probability. This value occurred amid a pronounced warm anomaly, with the daily maximum reaching 94°F—19°F above the 1991-2020 normal—driven by clear skies, light southwest winds, and elevated dew points that limited nocturnal cooling. Historical September lows average near 56°F, making this reading a significant outlier consistent with the ongoing heat event. Market consensus reflects high confidence in the verified station data, though minor discrepancies could arise from alternative microclimate stations or rounding conventions in final climatological summaries.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedLowest temperature in San Francisco on September 9?
Lowest temperature in San Francisco on September 9?
66-67°F 99.5%
55°F or below 1.0%
60-61°F 1.0%
62-63°F 1.0%
$1,835 Vol.
$1,835 Vol.
Sep 9, 2026
55°F or below
No
56-57°F
No
58-59°F
No
60-61°F
No
62-63°F
No
64-65°F
No
66-67°F
Yes
68-69°F
No
70-71°F
No
72-73°F
No
74°F or higher
No
66-67°F 99.5%
55°F or below 1.0%
60-61°F 1.0%
62-63°F 1.0%
$1,835 Vol.
$1,835 Vol.
Sep 9, 2026
55°F or below
$57 Vol.
No
56-57°F
$138 Vol.
No
58-59°F
$65 Vol.
No
60-61°F
$26 Vol.
No
62-63°F
$25 Vol.
No
64-65°F
$190 Vol.
No
66-67°F
$760 Vol.
Yes
68-69°F
$70 Vol.
No
70-71°F
$308 Vol.
No
72-73°F
$130 Vol.
No
74°F or higher
$67 Vol.
No
This market will resolve to the temperature range that contains the lowest temperature recorded by NOAA at the San Francisco International Airport Station in degrees Fahrenheit on 9 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=ksfo
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.Official National Weather Service observations recorded a minimum of 66°F at San Francisco International Airport on September 9, 2026, aligning precisely with the 66-67°F bin that commands over 95% implied probability. This value occurred amid a pronounced warm anomaly, with the daily maximum reaching 94°F—19°F above the 1991-2020 normal—driven by clear skies, light southwest winds, and elevated dew points that limited nocturnal cooling. Historical September lows average near 56°F, making this reading a significant outlier consistent with the ongoing heat event. Market consensus reflects high confidence in the verified station data, though minor discrepancies could arise from alternative microclimate stations or rounding conventions in final climatological summaries.
This market will resolve to the temperature range that contains the lowest temperature recorded by NOAA at the San Francisco International Airport Station in degrees Fahrenheit on 9 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=ksfo
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=ksfo
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 7, 2026, 7:29 AM ET
Volume
$1,835End Date
Sep 9, 2026Market Opened
Sep 7, 2026, 7:29 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=ksfoResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
This market will resolve to the temperature range that contains the lowest temperature recorded by NOAA at the San Francisco International Airport Station in degrees Fahrenheit on 9 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=ksfo
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.Official National Weather Service observations recorded a minimum of 66°F at San Francisco International Airport on September 9, 2026, aligning precisely with the 66-67°F bin that commands over 95% implied probability. This value occurred amid a pronounced warm anomaly, with the daily maximum reaching 94°F—19°F above the 1991-2020 normal—driven by clear skies, light southwest winds, and elevated dew points that limited nocturnal cooling. Historical September lows average near 56°F, making this reading a significant outlier consistent with the ongoing heat event. Market consensus reflects high confidence in the verified station data, though minor discrepancies could arise from alternative microclimate stations or rounding conventions in final climatological summaries.
This market will resolve to the temperature range that contains the lowest temperature recorded by NOAA at the San Francisco International Airport Station in degrees Fahrenheit on 9 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=ksfo
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=ksfo
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
$1,835End Date
Sep 9, 2026Market Opened
Sep 7, 2026, 7:29 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=ksfoResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
Official National Weather Service observations recorded a minimum of 66°F at San Francisco International Airport on September 9, 2026, aligning precisely with the 66-67°F bin that commands over 95% implied probability. This value occurred amid a pronounced warm anomaly, with the daily maximum reaching 94°F—19°F above the 1991-2020 normal—driven by clear skies, light southwest winds, and elevated dew points that limited nocturnal cooling. Historical September lows average near 56°F, making this reading a significant outlier consistent with the ongoing heat event. Market consensus reflects high confidence in the verified station data, though minor discrepancies could arise from alternative microclimate stations or rounding conventions in final climatological summaries.
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