San Francisco woke up today to a cool, mostly cloudy start in the low 50s, with a light southeast breeze and the kind of sky that hints something bigger is on the way. While the city should see some breaks of sun later today, the steadiest and most disruptive rain is lining up for the middle of the week.
Today and Sunday Afternoon
There is a slight chance of light rain before 8 AM, followed by partly sunny conditions, with a high near 64°F and south winds around 8 mph. By tonight, temperatures slip back into the upper 40s, and those breezes ease off. A light rain jacket will serve you well for any damp early hours, and drivers should watch for slick spots on city streets as the day unfolds.
Tuesday Into Wednesday: Heaviest Rain Expected
A stronger system is set to move in tomorrow night, with the most significant rain expected on Tuesday. Forecasts call for an 80% or greater chance of rain through the day, including pockets of locally heavy downpours. The National Weather Service notes that tropical moisture feeding into the system could bring the highest totals to the North Bay, where urban flooding and shallow landslides are possible. If you are planning to be out and about midweek, prepare for wet roads, slower commutes, and brief flooding in low-lying areas.
Winds, Surf, and Marine Advisories
Southerly winds are expected to ramp up along exposed shorelines, with gusts up to around 40 mph possible over coastal areas and higher terrain. Small-craft advisories remain in effect in parts of the northern waters. High surf and sneaker waves will keep beaches hazardous through midweek and may disrupt ferry or small-boat schedules.
Plan Ahead
For Tuesday, plan on rain gear, slower trips, and extra time to get where you are going. Avoid driving through standing water, and give buses and ferries some leeway to run behind schedule. Before heading out, check service alerts from SFMTA, BART, and ferry operators, and keep an eye on National Weather Service updates, especially if you live in the North Bay lowlands or near steep hillsides where flooding or slides could develop.
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