San Francisco, CA weather
Right now 81° · today 89° / 61°, partly cloudy · seven days from the National Weather Service
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Right now · 81° · 5° cooler than this time yesterday · at San Francisco, 5:30 PM
Today, in the Weather Service’s words
Partly sunny. High near 89, with temperatures falling to around 80 in the afternoon. West northwest wind 2 to 9 mph.
Seven days
Winter in San Francisco
San Francisco sees essentially no snow in an average year, according to NOAA’s 1991-2020 climate normals - a essentially snowless place. Measurable snow is close to unheard of. On the rare occasion it falls, everything stops.
That is why local snowfall thresholds differ so much from one town to the next: a district that plans for 0 inches a year is equipped differently from one that never sees any. Here, roughly 0.5 inches in a single storm is where a normal school day comes under threat.
Upper air over San Francisco
The nearest radiosonde launch is Oakland, about 11 miles away. A weather balloon goes up twice a day and measures temperature, humidity and wind all the way through the atmosphere - which is what forecasters actually read to judge whether storms will fire, and how a surface forecast was arrived at.
Sources: National Weather Service forecast and hourly grid for San Francisco (api.weather.gov), updated Sun, 8:26 PM UTC. Sunrise and sunset from NOAA’s solar position calculations. Snowfall normals from NOAA’s 1991-2020 US Climate Normals. County lines from the US Census Bureau.