Bilbao Temperature by Month

Bilbao in Basque Country, Spain sees significant seasonal temperature differences, with daytime highs between 13°C (55°F) in January and 24°C (75°F) in August, averaging 18°C (64°F) annually. Explore the full monthly breakdown below.

Visitors to Bilbao will encounter a climate influenced by big temperature differences across the year. Nighttime temperatures range from 17°C (63°F) in August to 6°C (43°F) in January.

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

The minimum temperature is often recorded between 4 AM and 6 AM, while the highest temperature is usually reached at 3 PM, when the sun's heating effect is strongest. August, the warmest month, gets 179 hours of sunshine.

The chart below shows the average temperature throughout the year:

Bilbao'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.

Seoul, South Korea averages 18°C (64°F) a year, with four clear seasons, cold winters, and hot humid summers.

Perth, Australia averages 25°C (77°F) annually, with a classic Mediterranean climate, hot dry summers and mild wet winters.

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 Bilbao, January is the coolest month, with average highs of 13°C (55°F) and humidity around 72%, considered high. In August, the warmest month, temperatures average 24°C (75°F) with 72% 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.

Whether a city sits on the coast or deep inland makes a significant difference to its climate. Coastal areas tend to have more stable temperatures year-round, large bodies of water absorb heat slowly in summer and release it gradually in winter, keeping extremes in check. Cities far from the sea don't benefit from that buffer, which is why continental climates tend to have hotter summers and colder winters than their coastal counterparts at the same latitude.

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