Pack or skip
Winter coat for Osaka in January
Verdict
Pack it
Average lows dip to 35°F — a real winter coat, not a jacket.
Why
Osaka in January averages highs of 48°F, lows of 35°F, 6 rainy days.
That climate means a winter coat earns its space in the bag. Average lows dip to 35°F — a real winter coat, not a jacket.