Will I be cold?
Will I be cold in San Jose in January?
Verdict
Maybe — Chilly at times.
Lows near 41°F — cool mornings and evenings, comfortable afternoons.
Day vs. night
Day
58°F
Cool
Sweater weather with the option to add a light shell.
Night
41°F
Cold
Cold enough that a hat and gloves become mandatory.
Why
San Jose in January averages highs of 58°F, lows of 41°F, 8 rainy days.
Layering wins here. A packable puffer plus a base layer handles the cool end without overheating in the middle of the day.
See a full outfit plan for chilly evenings →
San Jose in January outfit ideas from ForecastStyle.