**Current forecasts from the National Weather Service and other models indicate a minimum temperature of 58°F in San Francisco on September 20, 2026, under mostly cloudy to overcast skies with light west-southwest winds.** This aligns closely with the market's leading 58-59°F bin (51.5% implied probability) and reflects the typical influence of the marine layer, which moderates overnight cooling in coastal areas during mid-September. Supporting context includes consistent model runs projecting lows near 58°F, slightly above the long-term average of about 55.8°F for the date, with no significant cold-air advection or clear-sky radiative cooling expected to push readings lower. Nearby bins (56-57°F at 20% and 60-61°F at 22.5%) capture residual model spread and minor timing uncertainties in the overnight minimum. Traders are weighting official guidance heavily, as fresh forecast updates from agencies like NWS remain the primary near-term catalyst before resolution.
Eksperimental na AI-generated summary na nire-reference ang Polymarket data. Hindi ito trading advice at wala itong papel sa kung paano nire-resolve ang market na ito. · Na-updateLowest temperature in San Francisco on September 20?
58-59°F 59%
56-57°F 39%
62-63°F 39%
54-55°F 18%
51°F or below
7%
52-53°F
11%
54-55°F
18%
56-57°F
39%
58-59°F
52%
60-61°F
23%
62-63°F
39%
64-65°F
11%
66-67°F
3%
68-69°F
2%
70°F or higher
2%
58-59°F 59%
56-57°F 39%
62-63°F 39%
54-55°F 18%
51°F or below
7%
52-53°F
11%
54-55°F
18%
56-57°F
39%
58-59°F
52%
60-61°F
23%
62-63°F
39%
64-65°F
11%
66-67°F
3%
68-69°F
2%
70°F or higher
2%
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.
Binuksan ang Market: Sep 18, 2026, 7:29 AM ET
Resolution Source
https://www.weather.gov/wrh/timeseries?site=ksfoResolver
0x69c47De9D...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.
Resolution Source
https://www.weather.gov/wrh/timeseries?site=ksfoResolver
0x69c47De9D...**Current forecasts from the National Weather Service and other models indicate a minimum temperature of 58°F in San Francisco on September 20, 2026, under mostly cloudy to overcast skies with light west-southwest winds.** This aligns closely with the market's leading 58-59°F bin (51.5% implied probability) and reflects the typical influence of the marine layer, which moderates overnight cooling in coastal areas during mid-September. Supporting context includes consistent model runs projecting lows near 58°F, slightly above the long-term average of about 55.8°F for the date, with no significant cold-air advection or clear-sky radiative cooling expected to push readings lower. Nearby bins (56-57°F at 20% and 60-61°F at 22.5%) capture residual model spread and minor timing uncertainties in the overnight minimum. Traders are weighting official guidance heavily, as fresh forecast updates from agencies like NWS remain the primary near-term catalyst before resolution.
Eksperimental na AI-generated summary na nire-reference ang Polymarket data. Hindi ito trading advice at wala itong papel sa kung paano nire-resolve ang market na ito. · Na-update
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