Average Monthly Sunshine in Viana do Castelo

The graphs on this page shows the average number of hours per month and per day that Viana do Castelo receives direct sunlight. The numbers are calculated over a 30-year period to provide a reliable average.

Monthly hours of sunshine

Seasonal sunshine in Viana do Castelo varies. It peaks at 307 hours in July and drops to 122 hours in January. The total annual amount of sun is 2465 hours.

Daily hours of sunshine

In Viana do Castelo, summer days are longer and more sunny, with daily sunshine hours peaking at 10.2 hours in July. As the darker season arrives, the brightness of the sun becomes less. January sees a soft sun for only 4.1 hours per day.

Viana do Castelo’s total hours of sunshine compared to other major cities

Viana do Castelo enjoys an average of 2465 hours of sunshine annually. Let’s compare this with some popular tourist destinations:

Athens, Greece, enjoys 2769 hours of sunshine each year, making it one of the sunniest destinations in the Mediterranean region.

In contrast, Reykjavík, Iceland, receives only about 1330 hours of sunshine per year, known for its frequently overcast and rainy skies.

Boston, USA, enjoys 2629 hours of sunshine annually, with distinct seasons and many bright, sunny days.

In Tokyo, Japan, the average annual sunshine is 1930 hours, with sunny periods between rainy seasons.

Other climate information

November, Viana do Castelo’s wettest month, receives 41 mm of rainfall and has a maximum daytime temperature of 17°C. During the driest month July you can expect a temperature of 23°C.

For more detailed insights into the city’s temperatures, check out our Temperature page. To explore more about precipitation patterns, visit our Viana do Castelo Precipitation page.