Pack or skip
Sunscreen for Lisbon in September
Verdict
Pack it
Sun still finds you at 79°F — UV doesn't care about temperature.
Why
Lisbon in September averages highs of 79°F, lows of 63°F, 4 rainy days.
That climate means sunscreen earns its space in the bag. Sun still finds you at 79°F — UV doesn't care about temperature.