Pack or skip
Sunscreen for Osaka in September
Verdict
Pack it
Sun still finds you at 82°F — UV doesn't care about temperature.
Why
Osaka in September averages highs of 82°F, lows of 69°F, 11 rainy days.
That climate means sunscreen earns its space in the bag. Sun still finds you at 82°F — UV doesn't care about temperature.