Viana do Castelo Sunshine Hours by Month

When exploring climate, sunlight hours tell an important story. This page shows the total number of hours of direct sunlight per month and the average hours per day in Viana do Castelo, Norte Region, Portugal. The figures are based on a 30-year period (1990–2020) to provide a reliable average.

Monthly hours of sunshine

Sunshine in Viana do Castelo varies greatly throughout the year. The sunniest month, July, reaches an impressive 307 hours, while January, the darkest month, offers only 122 hours. The total annual amount of sun is 2465 hours.

Daily hours of sunshine

Seasonal changes in sunshine hours are quite obvious in Viana do Castelo. While July receives considerable daily sunshine with up to 10.2 hours, January marks the darkest time of the year, where sunshine is scarce with only 4.1 hours of sunlight per day.

Average percent of sunshine

On average the sun shines 73% of the time during the day in August, the highest percentage of any month. December has the lowest percentage at 46%.

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, Juneau, Alaska, receives only about 1523 hours of sunshine per year and is known for its very short days in winter and frequently overcast conditions.

Osaka, Japan, experiences 2010 hours of sunshine annually, with bright, sunny weather in spring and autumn.

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

November, Viana do Castelo’s wettest month, receives 41 mm (1.6 in) of rainfall and has a maximum daytime temperature of 17°C (63°F). During the driest month July you can expect a temperature of 23°C (73°F).

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.