Pack or skip
Rain jacket for San Francisco in December
Verdict
Pack it
Around 11 rainy days — a shell keeps you moving between subway stops.
Why
San Francisco in December averages highs of 57°F, lows of 46°F, 11 rainy days.
That climate means a rain jacket earns its space in the bag. Around 11 rainy days — a shell keeps you moving between subway stops.