The green islands are the highland interiors that stay coolest by day — and coolest by night. Each town below sits inside one of them.
The Pyrenees
Aragón & Val d'AranSpain's highest mountains. In these alpine valleys the night barely registers a tropical night all summer — you will want a blanket even in August.
Sierra de Gúdar
TeruelTeruel's high plateau is the poster child of the Spanish coolcation, with the sharpest day-to-night contrast in the country: scorching noons, genuinely cold nights.
Gredos & Guadarrama
The Central SystemThe granite sierras within easy reach of Madrid, where the mountain air drops like a stone the moment the sun goes down.
The Cantabrian Mountains
Cantabria & PalenciaGreen, Atlantic-facing highlands where summer nights stay reliably, dependably cool.
Sanabria
ZamoraA glacial-lake highland in the north-west — and, by the numbers, one of the very coolest places to sleep in all of Spain.
The Soria Highlands
Iberian SystemThe pine-forested sierras of Urbión and the upper Duero: continental, dry and high.
Search any town in the calculator, or watch the heatwave move across Spain in real time.
Frequently asked questions
Where can you sleep with a blanket in Spain in summer?
In the highland interior between roughly 600 and 1,700 m: the Pyrenees, the Sierra de Gúdar in Teruel, Gredos and Guadarrama, the Cantabrian Mountains, Sanabria and the Soria highlands. These towns record almost no tropical nights.
What is the coolest town in Spain to sleep in summer?
By average summer overnight low, Puerto del Pico (Ávila, 1.285 m) is among the coolest, at about 6.6 °C — and effectively zero tropical nights a year.
Are these good places for a coolcation?
Yes — they are the natural cool-climate destinations of Spain. Many sit inside national parks (Ordesa, Aigüestortes, Picos de Europa) or ski areas that reinvent themselves in summer as an escape from the heat. Cool days, cold nights, no crowds.
Is a town's climate the same as a hotel's temperature?
No — and we are careful about that. The data describe the outdoor climate of the town from AEMET stations: if the night cools down outside, sleeping is easier. It does not measure any individual building's interior.