Pack or skip
Sunscreen for Osaka in May
Verdict
Pack it
Sun still finds you at 74°F — UV doesn't care about temperature.
Why
Osaka in May averages highs of 74°F, lows of 59°F, 10 rainy days.
That climate means sunscreen earns its space in the bag. Sun still finds you at 74°F — UV doesn't care about temperature.