Opt for lightweight, breathable cotton or moisture-wicking synthetic clothes during the day as temperatures can rise to around 15-20°C. Layering is advisable because the weather can be variable.
Nights can be chilly, often dropping to near 5°C or lower. Pack warm layers such as fleece jackets, woollen sweaters, thermal inners, and a good insulated jacket.
Continue to use layered clothing, combining light innerwear with warm mid-layers and a waterproof outer-layer for possible afternoon showers or cold winds.
Pack extra socks, carry sun protection such as sunglasses and sunscreen because UV intensity can be high at altitude. Layers help adjust to temperature changes throughout the day.