Pack or skip
Packable down jacket for Osaka in September
Verdict
Skip it
Lows around 69°F — you'll never reach for it.
Why
Osaka in September averages highs of 82°F, lows of 69°F, 11 rainy days.
That climate means a packable down jacket isn't pulling its weight. Lows around 69°F — you'll never reach for it.