Will I be cold?
Will I be cold in Lima in December?
Verdict
No — No, comfortable.
Lows stay near 66°F — you won't be reaching for the puffer.
Day vs. night
Day
77°F
Warm
Breathable fabrics; sunscreen matters more than a jacket.
Night
66°F
Comfortable
Comfortable outside without an extra layer.
Why
Lima in December averages highs of 77°F, lows of 66°F, 0 rainy days.
You can pack for the daytime temps and not worry about the evening dip.