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Highest temperature in San Francisco on September 18?
Foretrace AI research
Understand the odds. Examine the reasoning.
Polymarket shows market prices. Foretrace adds AI probability estimates, opposing evidence and a price-dependent outcome or pass decision for each open market.
View a sample AI report No open markets in this event. Closed markets retain historical data.
24h volumeUnavailable
Total volume$44K
LiquidityUnavailable
Event end date · UTCSep 18, 2026
Price history
Market probabilityLoading price history…
Polymarket · UTC
Sampled market observations, not AI forecasts. Lines connect available observations. Legend values are current provider quotes; chart points may be older.
Outcomes & resolution rules
11 marketsThese are market-implied probabilities, not AI forecasts. A displayed quote may differ from the price available for your order.
63°F or belowClosedMarket odds0%
Will the highest temperature in San Francisco be 63°F or below on September 18?
Yes0%Polymarket estimate
No100%Polymarket estimate
- Liquidity
- Unavailable
- Deadline · UTC
- Sep 18, 2026
- Yes bid / ask
- — / 0.1¢
- Trading fees
- Enabled · verify on Polymarket
Closed market · historical data
This market is closed. Its historical data remains available.
How research worksResolution rules
This market will resolve to the temperature range that contains the highest temperature recorded by NOAA at the San Francisco International Airport Station in degrees Fahrenheit on 18 Sep '26. The resolution source for this market will be information from NOAA, specifically the highest 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.