Pack or skip
Winter coat for San Francisco in September
Verdict
Skip it
Lows stay near 57°F — a coat is overkill.
Why
San Francisco in September averages highs of 70°F, lows of 57°F, 2 rainy days.
That climate means a winter coat isn't pulling its weight. Lows stay near 57°F — a coat is overkill.
What to bring instead
Consider packable down jacket instead →
See the pack-or-skip verdict for packable down jacket in San Francisco in September.