Pack or skip
Beanie for Lisbon in September
Verdict
Skip it
Lows near 63°F — no scenario where you'll want one.
Why
Lisbon in September averages highs of 79°F, lows of 63°F, 4 rainy days.
That climate means a beanie isn't pulling its weight. Lows near 63°F — no scenario where you'll want one.