Pack or skip
Winter coat for San Jose in September
Verdict
Skip it
Lows stay near 59°F — a coat is overkill.
Why
San Jose in September averages highs of 84°F, lows of 59°F, 1 rainy days.
That climate means a winter coat isn't pulling its weight. Lows stay near 59°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 Jose in September.