Pack or skip
Beanie for San Jose in January
Verdict
Pack it
Lows around 41°F — a beanie doubles the perceived warmth for zero grams.
Why
San Jose in January averages highs of 58°F, lows of 41°F, 8 rainy days.
That climate means a beanie earns its space in the bag. Lows around 41°F — a beanie doubles the perceived warmth for zero grams.