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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Canada Edition Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
San Francisco’s weather today, as shown in the live forecast above, delivers the city’s signature blend of coastal fog, cool Pacific breezes, and sharp microclimate shifts — a far cry from anything you’d expect from a typical Canadian summer afternoon.
How does San Francisco’s microclimate system actually work?
The Golden Gate acts as a natural funnel for marine air, pushing fog and wind straight into the western neighbourhoods — Sunset and Richmond districts can sit under a grey blanket while the Mission and SoMa bake in full sun just a few kilometres inland. Temperature differences of 8–12°C between the coast and the eastern side of the city are routine, even in July. Unlike Vancouver’s more uniform coastal pattern, San Francisco’s topography creates dozens of distinct weather zones within a single postcode.
What should a visitor pack for a week in San Francisco?
The reliable rule is layers — a light jacket or fleece works year-round, even when the midday sun feels warm. Mornings and evenings almost always carry a chill, and the famous Karl the Fog can roll in within minutes. The city sees virtually no rain from May through October, making it a dependable West Coast destination compared to Canada’s more volatile spring and fall.
Does San Francisco ever get hot enough for shorts and T-shirts?
Yes, but only east of Twin Peaks. The Mission, SoMa, and parts of the Financial District can reach 27–30°C during heat events, while Ocean Beach stays at 15°C. Check the live forecast above for the specific neighbourhood you’re visiting.
Why is San Francisco colder than Los Angeles in summer?
The California Current brings cold water from Alaska down the coast, and the region’s upwelling keeps ocean temperatures around 12–14°C. That cold water chills the marine air, which then gets pulled inland through the Golden Gate gap. LA sits further south with warmer offshore currents.
Is the fog dangerous for driving?
It can be, especially on the Golden Gate Bridge and along Highway 1 near the coast. Visibility can drop below 200 metres in minutes. Drive with low beams, reduce speed, and be aware that fog typically thickens in late afternoon and lingers through the morning.