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Viana do Castelo Climate by Month

Temperatures see a moderate degree of fluctuation, transitioning from warm conditions to mild. It also has a relatively rainy climate with high levels of precipitation. Let’s explore the climate details in depth to provide you with a complete overview.

Average day and night temperature

The climate in Viana do Castelo experiences moderate temperature changes, with mild shifts between seasons. On average, daytime temperatures range from a comfortable 24°C in August to a moderate 14°C in January. Nighttime temperatures can drop, with averages reaching 8°C in January.

The mean minimum and maximum temperatures throughout the year

Precipitation and rainy days

Viana do Castelo is known for its substantial rainfall, with annual precipitation reaching 1649 mm. The seasons in Viana do Castelo, bring significant changes in precipitation. The wettest month, November, receives heavy rainfall, with an average of 225 mm of precipitation. This rainfall is distributed across 17 rainy days. In contrast, the driest month, July, experiences much less rainfall, totaling 29 mm over 7 rainy days. These distinct seasonal differences provide diverse experiences throughout the year.

The mean monthly precipitation over the year, including rain, hail and snow

Sunshine over the year

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.

Monthly hours of sunshine

Data from: Porto, Portugal (52 KM, 32 Miles).

Daily hours of sunshine

Data from: Porto, Portugal (52 KM, 32 Miles).

The best time of year to visit Viana do Castelo in Portugal

During the months of June, July, August and September you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.

Other facts from our historical weather data:
  • When is the rainy season in Viana do Castelo?
    Rainy season in Viana do Castelo occurs in the months of January, February, March, October, November and December.
  • Which is the warmest month in Viana do Castelo?
    August has an average maximum temperature of 24°C and is the warmest month of the year.
  • Which is the coldest month in Viana do Castelo?
    The coldest month is January with an average maximum temperature of 14°C.
  • Which is the wettest month in Viana do Castelo?
    November tops the wettest month list with 225 mm of rainfall.
  • Which is the driest month in Viana do Castelo?
    July is the driest month with 29 mm of precipitation.
  • Which is the sunniest month in Viana do Castelo?
    July is the sunniest month with an average of 307 hours of sunshine.

  • No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.

    Forecast for Viana do Castelo

    Thu   Nov 21
    17°C | 13°C
    W 14 km/h
    5 mm
    broken clouds and rain

    broken clouds and rain

    Fri   Nov 22
    16°C | 11°C
    N 7 km/h
    1.2 mm
    partly cloudy and  chance of slight rain

    partly cloudy and chance of slight rain

    Sat   Nov 23
    20°C | 14°C
    SE 14 km/h
    broken clouds and no rain

    broken clouds and no rain