Climate in Peru by Month
Peru can deliver beach heat, crisp highland air, and tropical humidity all in a single day of travel. The coast, Andes, and Amazon follow their own rules.
Peru can offer beach warmth, crisp highland air, and tropical humidity all in a single travel day because three major natural regions stack up against each other: the coast, the Andes, and the Amazon. Planning by month works well if the regional logic is clear.
Plan Your Trip Directly
At a Glance
Coast
Summer usually December to April. Garúa, fog and high humidity often characterize May to November.
Andes
Rain mostly November to March. Dry season mostly April to October, with clear days and cool nights.
Amazon
Warm and humid year-round. The drier phase is often between May and October.
Planning rule: Your route determines the best time to travel. Highlands and trekking usually benefit from the Andean dry season, while beach plans are better suited for the coastal summer months.
Why the climate in Peru is so varied
A combination of tropical location, the cold Humboldt Current, the Andean barrier, and the Amazon lowlands creates many climate types in a small area of Peru. The national weather service describes a particularly great diversity because the Andes block air masses and create altitude zones.
On the Pacific coast, cold ocean water often causes a temperature inversion, fog, and drizzle. Behind the ridge of the Andes, the picture changes: moist air from the east brings frequent, sometimes heavy rainfall to the Amazon region.
Seasons and Rainy Seasons Overview
Coast
A classic coastal summer usually runs between December and April, with more sun and pleasantly warm temperatures. Between May and November, fog, garúa, and high humidity often characterize the conditions.
Andes
A rainy season occurs in many highland regions roughly between November and March. A dry season follows in many areas roughly between April and October, with clear air and more stable days.
Amazon
A rather wet phase in many parts of the Peruvian Amazon is often between November and April. A rather drier phase frequently follows between May and October.
Peru Weather Month by Month
January
Coastal towns are often in summer mode with warm days. In the highlands, the rainy season frequently shows with showers and clouds. The Amazon remains humid and rainy.
February
Coastal holidays often continue to work well, while the highlands in many places can reach their wettest period. Maintenance of the classic Inca Trail often falls in this month.
March
Coastal weather often remains warm. In the highlands, the rainy season in many regions is slowly coming to an end. In the Amazon, humid and warm weather continues.
April
On the coast, temperatures drop slightly. In many regions of the Andes, the drier season begins. In the Amazon, rain often decreases somewhat.
May
Coastal winter and garúa can establish themselves. In the highlands, stability for excursions and mountain regions increases. In the Amazon, the drier phase often begins.
June
Coastal cities often appear cool and grey. In the Andes, the dry season is often in full swing, with clear days and cold nights.
July
Coastal winter remains present. Highland nights often reach the coldest values of the year. In the Amazon, July is often one of the drier months.
August
Coastal areas often remain cool, fog is typical. In the Andes, the dry season usually continues. In the Amazon, it remains warm.
September
On the coast, the weather can slowly move towards spring. In many parts of the Andes, the dry season is still present. In the Amazon, a transition to more rain often begins.
October
Coastal spring often brings a bit more sun. In many regions of the Andes, the chance of precipitation increases again. In the Amazon, rain usually increases.
November
Coastal weather often becomes friendlier and warmer. In many areas of the Andes, the rainy season begins more noticeably. In the Amazon, the wet phase often begins.
December
Coastal summer begins in many regions. In the Andes, rain increases. In the Amazon, it remains warm and rainy.
Reference Values: Lima, Cusco, Iquitos
The values serve as a rough guide for typical conditions in three reference locations. Microclimate, altitude, north-south location, and current weather patterns can vary significantly.
Lima
Coastal climate with mild temperatures. Rain is rare, garúa and cloudiness characterize the winter particularly.
Cusco
Highland climate with cool nights. Most rain typically falls in the warmer half of the year.
Iquitos
Amazon climate with warmth and high humidity year-round. Rain remains a theme throughout the year.
Show monthly values
| Month | Lima Max/Min | Cusco Max/Min | Cusco Precipitation | Iquitos Max/Min | Iquitos Precipitation |
|---|---|---|---|---|---|
| January | 26/20 °C | 17/7 °C | 107 mm | 31/23 °C | 241 mm |
| February | 27/21 °C | 17/7 °C | 97 mm | 31/23 °C | 231 mm |
| March | 27/20 °C | 17/7 °C | 66 mm | 31/23 °C | 257 mm |
| April | 24/18 °C | 18/5 °C | 28 mm | 31/23 °C | 257 mm |
| May | 22/17 °C | 18/2 °C | 5 mm | 31/23 °C | 213 mm |
| June | 21/16 °C | 18/1 °C | 3 mm | 30/22 °C | 152 mm |
| July | 19/16 °C | 18/0 °C | 3 mm | 30/22 °C | 122 mm |
| August | 19/15 °C | 18/2 °C | 3 mm | 31/22 °C | 127 mm |
| September | 19/16 °C | 18/4 °C | 13 mm | 32/22 °C | 147 mm |
| October | 21/16 °C | 18/6 °C | 33 mm | 32/23 °C | 193 mm |
| November | 22/17 °C | 18/6 °C | 48 mm | 32/23 °C | 206 mm |
| December | 24/18 °C | 18/7 °C | 81 mm | 31/23 °C | 224 mm |
Coastal rain remains rare in Lima, while garúa and cloudiness can characterize winter. In the highlands, most rain typically falls in the warmer half of the year. In the Amazon, it remains warm year-round.
Best Travel Time by Interest and Region
Highlands & Round Trip
The Andean dry season, roughly between April and October, often provides more stable days, clearer views, and better conditions for passes, excursions, and longer routes.
Beach & Coast
Coastal summer is often between December and April. Beach plans particularly benefit from January to March.
Amazon
A drier period between roughly May and October often facilitates activities on land routes. A wetter period can make boat tours more attractive.
Quieter Travel Time
April, May, and also September and October are often described as a balance of usable conditions and less crowding.
Clothing and Equipment by Region
Coast
- Light outfit for warm summer days from December to April.
- Windproof layer for the garúa season.
- Quick-drying fabrics for high humidity.
Andes
- Layering system due to large differences between sun and shade.
- Warm layer for evenings and early mornings.
- Rain protection during the rainy season and non-slip shoes.
Amazon
- Light, airy clothing in long cuts.
- Reliable rain protection year-round.
- Waterproof bags for electronics and documents.
Weather Risks:
Rain, Cold, Heat, and El Niño
Rain
Rain and Landslides
During the Andean rainy season, heavy downpours can soften paths, temporarily affect roads, and make some routes impractical for a time.
Garúa
Garúa on the Coast
Garúa can significantly reduce sunlight, even though almost no measurable rain falls. This often feels colder and wetter than the readings suggest.
Heat
Humidity in the Amazon
High humidity is the norm there. Breaks, sufficient water, and a daily structure with less activity during the hottest part of the day are often advisable.
El Niño
El Niño and El Niño Costero
An El Niño can warm coastal waters, thereby changing weather and precipitation. Therefore, travel planning also requires looking at seasonal forecasts and warnings.
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Follow PeruMagazinFAQ
When is the rainy season in Peru?
In many Andean regions, the rainy season is roughly between November and March. In the Amazon region, a wet phase often occurs between November and April.
Which months are good for Machu Picchu and Cusco?
Many plans work well during the Andean dry season, approximately between April and October. Transition months like April, May, and September can offer a good balance.
What role does altitude play in how temperature feels?
A big difference between day and night is normal in the Andes. Sunny middays often feel pleasant, while evenings and nights can get cold.
Why does Lima feel cool in winter, even though there's hardly any rain?
Fog, high humidity, and Garúa reduce sunlight and make the air feel colder. Measurable precipitation often remains low.
Which months are good for the Amazon?
A drier period, approximately between May and October, often facilitates activities on solid paths. A wetter period supports boat tours and trips into flooded forest areas.
Sources
- SENAMHI: Mapa Climático del Perú, reference to 38 climate types
- Wikipedia: Climate of Peru, Garúa and Humboldt Current
- WeatherSpark: Average Weather in Lima, Cusco, Iquitos
- Amazon River Expeditions: Information on rainy and dry seasons in the Peruvian Amazon
- U.S. Embassy Lima: Weather advisory regarding Inca Trail closure in February
- Journal of Climate: Study on precipitation on the coast of Peru during strong El Niño events
- Academic article: Analysis of the extreme coastal El Niño 2023
