Will I be cold?
Will I be cold in Lima in September?
Verdict
No — No, comfortable.
Lows stay near 59°F — you won't be reaching for the puffer.
Day vs. night
Day
66°F
Comfortable
A T-shirt and a light overshirt is enough.
Night
59°F
Comfortable
Comfortable outside without an extra layer.
Why
Lima in September averages highs of 66°F, lows of 59°F, 2 rainy days.
You can pack for the daytime temps and not worry about the evening dip.