Santiago de Compostela Temperature by Month

Santiago de Compostela in Galicia, Spain sees significant seasonal temperature differences, with daytime highs between 13°C (55°F) in January and 25°C (77°F) in August, averaging 18°C (64°F) annually. Explore the full monthly breakdown below.

The climate in Santiago de Compostela is dynamic, ranging widely from moderate in winter to comfortable in summer. Nights are significantly colder, with lows dropping from 15°C (59°F) in August to 6°C (43°F) in January.

The chart below illustrates the average maximum day and minimum night temperatures in Santiago de Compostela by month:

From around 4 AM to 6 AM temperatures are at their lowest; by 3 PM they've climbed to their daily peak. August, the warmest month, averages 236 hours of sunshine.

The chart below shows the average temperature throughout the year:

Santiago de Compostela's average annual maximum temperature is 18°C (64°F). To put that in context, here's how it compares to a few well-known destinations:

Rome, Italy averages 20°C (68°F) annually, with reliably warm summers and comfortable winters.

Glasgow, Scotland averages 13°C (55°F) a year, mild but often grey, with cold winters and rarely hot summers.

Chicago, USA averages 15°C (59°F) annually, known for extreme seasonal swings, from bitterly cold winters to warm summers.

Brisbane, Australia averages 26°C (79°F) a year, with warm winters and hot, humid summers.

Temperature alone doesn't tell the whole story, humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.

In the cooler months, when temperatures drop below 10°C, high humidity makes the cold feel more cutting than it would in dry conditions.

In Santiago de Compostela, January is the coolest month, with average highs of 13°C (55°F) and humidity around 83%, considered very high. In August, the warmest month, temperatures average 25°C (77°F) with 74% humidity, conditions that feel high. For a full picture, see our humidity page.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

Seasonal temperature shifts influence more than just how warm it feels, they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.

Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Santiago de Compostela this rarely lasts long on the ground.

For more on Santiago de Compostela's weather, including monthly rainfall, sunshine hours, and humidity, visit our Santiago de Compostela climate page.