December in Lima marks the beginning of summer in the Southern Hemisphere, transforming the coastal capital of Peru into a city of vibrant energy and warm coastal breezes. While the world often associates Peru with the high-altitude chill of the Andes, Lima’s weather during this month is defined by its Pacific Ocean proximity, offering a reprieve from the heat inland.
Temperature and Climate Overview
The temperature in Lima during December sits in a comfortable range, rarely becoming oppressively hot. Daytime highs typically hover between 24°C and 28°C (75°F to 82°F), providing ideal conditions for outdoor activities without the intense humidity found to the north or south. Evenings cool down significantly, with temperatures often dropping to a pleasant 16°C to 19°C (61°F to 66°F), making a light jacket or cardigan a necessary accessory for nighttime strolls along the waterfront.
Oceanic Influence and Humidity
Lima’s climate is heavily moderated by the cold Humboldt Current, which flows northward along the coast. This current keeps the sea temperature cool year-round and prevents the air from becoming too muggy, despite the summer season. In December, the average humidity levels remain relatively high, often sitting around 70% to 80%, but the consistent sea breeze ensures the heat feels dry rather than sticky.
The Coastal Weather Phenomenon
December is the heart of "Verano Limeño," but the weather pattern is distinct from inland summer experiences. The city frequently experiences the "garúa," a coastal fog that rolls in from the ocean during the early morning and late afternoon. This mist creates a unique atmospheric condition where it might be sunny in one district and misty in another just a few kilometers away, adding a layer of visual drama to the skyline.
Rainfall and Sunshine
Although December is technically within the summer season, actual rainfall in Lima is minimal. The city is located in a desert climate, and precipitation is scarce. However, the skies are rarely completely overcast; December offers a mix of clear, sunny days perfect for beach visits and the occasional overcast morning that burns off by midday. This balance ensures ample sunshine for sightseeing without the constant glare of a cloudless sky.
What to Pack and Wear
Packing for Lima in December requires a strategy that layers light, breathable clothing with pieces for cooler moments. Lightweight fabrics like linen and cotton are essential for the daytime heat, while long pants and a sweater are necessary for the evening chill. Swimwear is a must for the coastal resorts, but remember that public beaches in Lima are often rocky, so water shoes are highly recommended.
Sun Protection is Essential
Even with the ocean breeze, the UV index in Lima remains high during the Southern Hemisphere summer. Sunscreen with a high SPF, sunglasses, and a wide-brimmed hat are non-negotiable items for any outdoor excursion. The reflection off the Pacific Ocean and the pale-colored streets can intensify the sun’s rays, making protection vital even on days that feel mild.
