{"city":"San Francisco","region":"US-CA","country":"US","slug":"san-francisco-ca","updated":"2026-08-16T02:45Z","window":{"start":"2016-01-01","through":"2026-08-15"},"stations":[{"icao":"KSFO","name":"San Francisco International Airport","subCat1HoursPerYear":10,"forecast":"verifying"}],"primaryStation":"KSFO","forecast":{"covered":true,"public":false,"cycle":"2026-08-16T00:00:00Z","guidanceSignal":true,"wording":"NWS guidance shows a fog signal here in the next 48 hours. This station's calibrated percentages publish after live verification clears the accuracy bar. dense fog (visibility under a mile) is rare here in August."},"climatology":{"subCat1HoursPerYear":10,"fogSeasonPeakMonths":["December","January"],"medianEventHours":2,"season":{"summary":"Fog season runs December through January, peaking in January; fog is mostly a 3 AM\u20138 AM phenomenon; typically thinning out by 11 AM; a typical event lasts about 2 hours (local time, 10-year average).","months":["January","December"],"timeOfDay":"3 AM\u20138 AM","typicallyClearsBy":"11 AM"}},"links":{"page":"https://fogatlas.org/fog/city/san-francisco-ca/","stationPages":["https://fogatlas.org/fog/ksfo/"],"verification":"https://fogatlas.org/fog/scorecard/"}}