Pack or skip
Winter coat for Seoul in September
Verdict
Skip it
Lows stay near 63°F — a coat is overkill.
Why
Seoul in September averages highs of 79°F, lows of 63°F, 10 rainy days.
That climate means a winter coat isn't pulling its weight. Lows stay near 63°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 Seoul in September.