San Jose weekend weather
This weekend in San Jose, 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 80° across the weekend. Agreement is medium - plausible, but worth re-checking closer to the day.
Tomorrow
2026-09-19 — every model, side by sideNWSNational Blend (NBM)
82°
Fog
AmericanNOAA GFS
78°
Fog
EuropeanECMWF
85°
Cloudy
The models range from 78° to 85°. Treat the middle of that range as the likely outcome and keep a backup plan.
Sun
2026-09-20 — every model, side by sideNWSNational Blend (NBM)
76°
Cloudy
AmericanNOAA GFS
81°
Fog
EuropeanECMWF
75°
Cloudy
The models range from 75° to 81°. Treat the middle of that range as the likely outcome and keep a backup plan.
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.