Pack or skip
Packable down jacket for San Francisco in December
Verdict
Pack it
Lows around 46°F — the packable puffer covers 90% of layering needs.
Why
San Francisco in December averages highs of 57°F, lows of 46°F, 11 rainy days.
That climate means a packable down jacket earns its space in the bag. Lows around 46°F — the packable puffer covers 90% of layering needs.