San Francisco weekend weather
This weekend in San Francisco, CA, model by model. Weekend forecasts are far enough out that the models often split - so we show you where.
Weekend
The models centre on about 67° across the weekend. Agreement is high - unusually solid for this far out.
Tomorrow
2026-09-19 — every model, side by sideNWSNational Blend (NBM)
70°
Fog
AmericanNOAA GFS
70°
Fog
EuropeanECMWF
67°
Cloudy
All 3 models land within 3° of each other for this day — that is a forecast you can plan on.
Sun
2026-09-20 — every model, side by sideNWSNational Blend (NBM)
65°
Cloudy
AmericanNOAA GFS
67°
Cloudy
EuropeanECMWF
63°
Cloudy
All 3 models land within 4° of each other for this day — that is a forecast you can plan on.
Where the models disagree
temperature and rain, judged separatelyThe models often agree on temperature and still split on rain, and rain is usually what decides whether a plan survives. A wide rain range means the shower is genuinely uncertain, not that the forecast is wrong.
Common questions
Will it rain this weekend?
The models are not currently showing a high weekend rain risk, and they broadly agree with each other.
How reliable is a weekend forecast?
It depends how far away the weekend is. Forecast error grows steadily with lead time, so a Saturday forecast made on Friday is far stronger than one made the previous Monday. The honest signal is model agreement: when they converge the forecast is solid, and when they spread the weekend is genuinely uncertain.