Climate in Viana do Castelo (Norte Region), Portugal

The graphs below show the monthly weather averages over the year.
* Climate data from: Porto, Portugal (52 KM, 32 Miles).

Average day and night temperature

The mean minimum and maximum temperatures over the year. Show in Fahrenheit

Average min and max temperatures in Porto, Portugal   Copyright © 2022  weather-and-climate.com

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Monthly hours of sunshine

The average monthly total hours of sunshine over the year

Average monthly sunhours in Porto, Portugal   Copyright © 2022  weather-and-climate.com

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Daily percent of sunshine

The mean percent of sunhours during the day over the year

Average percent of sunshine in Porto, Portugal   Copyright © 2022  weather-and-climate.com

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Average water temperature

The mean water temperature over the year. Show in Fahrenheit

Average water temperatures in Porto, Portugal   Copyright © 2022  weather-and-climate.com

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Monthly precipitation

The mean monthly precipitation over the year, including rain, snow, hail etc. Show in Inches

Average precipitation (rain/snow) in Porto, Portugal   Copyright © 2022  weather-and-climate.com

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Monthly rainy days

The average number of days each month with rain, snow, hail etc.

Average rainy days (rain/snow) in Porto, Portugal   Copyright © 2022  weather-and-climate.com

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Average humidity

The mean monthly relative humidity over the year

Average relative humidity in Porto, Portugal   Copyright © 2022  weather-and-climate.com

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Average wind speed

The mean monthly wind speed over the year (in meters per second)

Average wind speed in Porto, Portugal   Copyright © 2022  weather-and-climate.com

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Weather Forecasts for Viana do Castelo (Norte Region)

TUE Aug 09
27°C | 15°C
Sunny

Sunny

WED Aug 10
25°C | 17°C
Moderate rain

Moderate rain

THU Aug 11
26°C | 15°C
Patchy rain possible

Patchy rain possible

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

During the month of May, June, July, August, September and October you are most likely to experience good weather with pleasant average temperatures that fall between 20 degrees Celsius (68°F) and 26 degrees Celsius (79°F).

Other facts from our historical climate data:

  • Which months have the greatest rainfall in Viana do Castelo?
    Most rainfall (rainy season) is seen in October, November and December.
  • Which is the warmest month in Viana do Castelo?
    August has an average maximum temperature of 26°C (78°F) 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 (57°F).
  • Which is the wettest month in Viana do Castelo?
    December tops the wettest month list with 180mm (7.1in) of rainfall.
  • Which is the driest month in Viana do Castelo?
    July is the driest month with 20mm (0.8in) 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 now have a tool which suggests which destination suits your ideal climate conditions. Find out where to go with our weather planner.