Pack or skip
Packable down jacket for San Diego in January
Verdict
Pack it
Lows around 49°F — the packable puffer covers 90% of layering needs.
Why
San Diego in January averages highs of 66°F, lows of 49°F, 6 rainy days.
That climate means a packable down jacket earns its space in the bag. Lows around 49°F — the packable puffer covers 90% of layering needs.