Highest temperature in San Francisco on August 18?
- Will the highest temperature in San Francisco be between 70-71°F on August 18?32¢
- Will the highest temperature in San Francisco be between 74-75°F on August 18?10¢
- Will the highest temperature in San Francisco be between 82-83°F on August 18?<1¢
- Will the highest temperature in San Francisco be between 76-77°F on August 18?2¢
- Will the highest temperature in San Francisco be between 78-79°F on August 18?<1¢
- Will the highest temperature in San Francisco be between 72-73°F on August 18?30¢
- Will the highest temperature in San Francisco be between 84-85°F on August 18?<1¢
- Will the highest temperature in San Francisco be 86°F or higher on August 18?<1¢
- Will the highest temperature in San Francisco be 67°F or below on August 18?8¢
- Will the highest temperature in San Francisco be between 80-81°F on August 18?<1¢
- Will the highest temperature in San Francisco be between 68-69°F on August 18?20¢
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.
Marine layer depth and onshore flow from the cool California Current are the dominant controls on San Francisco’s peak temperature for August 18, with National Weather Service and model guidance clustering highs in the upper 60s to low 70s °F. A persistent temperature inversion and moderate westerly winds limit daytime heating, keeping outcomes near the historical August mean of 67–70 °F most probable. Recent model runs show slight warming potential if the marine layer thins overnight, which explains why the 70–71 °F and 72–73 °F bins hold the highest implied probabilities at 32 % and 29.5 % respectively; stronger onshore flow or deeper stratus would favor the 68–69 °F range instead.