Weather guides

How to Read a Weather Radar

Learn what radar colors mean, how radar differs from satellite, what it cannot show, and how to combine radar with the forecast to plan the next few hours.

The garúa and Lima's climate: why it is so grey

What the garúa is, why Lima spends months under grey skies and drizzle without real rain, and what the Peruvian coast's climate is like through the year.

The coastal El Niño and huaicos in Peru

What the coastal El Niño is, why it causes intense rain, flooding and huaicos on Peru's coast and sierra, and how to prepare.

Altitude sickness (soroche) in Peru: Cusco, Puno and Arequipa

What soroche or altitude sickness is, why it strikes in Cusco, Puno, Arequipa and Machu Picchu, and how to acclimatise and prevent it.

The friaje in the Peruvian rainforest: when cold reaches the tropics

What the friaje is, why the Peruvian Amazon suffers sharp temperature drops, and how it affects regions such as Madre de Dios and Loreto.

Extreme UV index in the Peruvian sierra

Why the UV index in the Peruvian sierra (Cusco, Puno, Arequipa) reaches extreme levels, what each level means, and how to protect your skin and eyes.

How a Weather Forecast Is Made

Find out how a weather forecast is built: the observations, numerical models such as ECMWF, GFS and ICON, why forecasts carry uncertainty, and how often the data is updated.

Feels-like temperature: why it differs from the thermometer

What feels-like temperature is, how it differs from air temperature, how wind and humidity change what you sense, and why it matters for your health and clothing.

Humidity and Comfort: How It Affects Your Body

The difference between relative and absolute humidity, what dew point is, why high humidity feels hotter and low humidity dries you out, and the comfortable ranges.

Air Quality and the AQI Index

What the air quality index (AQI) means, the main pollutants such as PM2.5, PM10, O₃ and NO₂, the health categories, and how to reduce your exposure.