What to pack for Cusco in December

27 rain days a month finds every seam. A real shell, not a windbreaker.

Wear one, dry one. Cotton stays wet all week here.

UV index of 8.5 at 3347 meters burns skin in minutes.

Glare off mountain surfaces at this altitude strains unprotected eyes.

December rains bring insects that thrive in 75 percent humidity.

Altitude sickness, contaminated water, and insect bites need quick treatment.

Tap water isn't safe here. A filter bottle beats buying plastic twice a day.

One outlet at the guesthouse. This charges three devices at once.

Set it up before you land. Signal drops for long stretches outside cities.

Day hikes on mountain trails need hands free and water close.

Fits the overhead on every airline that matters. Skip the checked-bag line entirely.

For the passport, the chargers, and the one dry pair of socks.

UV hits 8.5 here. Long sleeves beat reapplying sunscreen every hour.

Twelve hours of daylight at high altitude means intense sun exposure.

Thin air at 3347 meters dehydrates faster than lowland travel.

Treat the clothes once and it lasts weeks.

Tap water here causes diarrhea; salts replace lost electrolytes fast.

Unsafe tap water leads to stomach trouble within days of arrival.

Above 2,500 m most people feel it. Go slow the first two days.

One brick charges the laptop, phone, and camera.

Hotel and cafe wifi is shared with everyone else in the building. A VPN keeps your banking and email to yourself.

International travel and crowded markets make theft a real risk.

Mountain terrain and crowded stations make bags easy to lose.

Damp clothes mildew in 75 percent humidity without separation.

Wet conditions and humidity mean clothes need washing every few days.

Twenty-seven rain days a month means long stretches indoors on crowded buses.

Mountain terrain and altitude make steep paths harder on joints.

Twenty-seven rain days in December soak through regular boots.

Lips crack and blister from both altitude and UV radiation.

High altitude and winding mountain roads trigger motion sickness.

Contaminated water means hands need sanitizing before eating.

Sunburned skin and bug bites both need relief simultaneously.

Altitude and humidity corrode connections; short cables fail first.

A few phrases go a long way. Ten minutes a day before you leave is plenty.

Border crossings require documents kept dry and organized.

Luggage passes through multiple hands between arrival and lodging.

Hanging storage keeps toiletries dry in a humid guesthouse.

Altitude at 3347 meters and thin air make sleep harder the first nights.