Temperatures in December
It's cool to moderate in December in Viana do Castelo with an average temperature of 15°C. Temperatures this month range from a low of 14°C to a high of 16°C. At night, you can expect temperatures between 7°C and 10°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Viana do Castelo in December. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of December
The month of December starts in Viana do Castelo with cool temperatures, averaging around 16°C during the day and nights close to 8°C. You can expect regular precipitation, but there’s also a chance for some sunny days in the first days of the month.
Mid-December
By mid-December, the average daytime temperature drops to around 15°C, with nights close to 9°C. The chance of precipitation is high during this period.
End of December
By the end of December, the average daytime temperature in Viana do Castelo will be around 15°C, with nights close to 9°C. There’s a significant chance of many days with precipitation.
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Water temperature
The water temperature at Viana do Castelo is 17°C this month. You can swim, but it's a bit on the chilly side.
Precipitation in December
In December, there is an average of 185 mm of precipitation, spread over 14 days. The wind speed is around 4 Bft, mostly coming from the South.
The average precipitation chance is 47% per day this month. Though it seems average, the weather’s variable. Some days have higher, others lower precipitation chances.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in December for Viana do Castelo. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
Viana do Castelo in December |
London | ||
|---|---|---|---|
 Average Temperature |
15°C | 9°C | |
 High Temp |
16°C | 11°C | |
| Low Temp |
14°C | 8°C | |
 Total Precipitation |
185 mm | 67 mm | |
| Rainy Days |
14 days | 10 days | |
November
UV index
The UV index is a maximum of 3 this month. That's a moderate value on the intensity scale of 1 to 11. Unprotected skin can burn in about 30 minutes.
Is December a good time to visit Viana do Castelo?
Looking for sun and warm weather? Then December isn’t the best time to be in Viana do Castelo. The temperature is too low this month for a warm stay.
Temperature records for Viana do Castelo in December
With 22°C, Viana do Castelo hit the highest temperature in the last 10 years in December 2019. The lowest daytime temperature in this month was 8°C in 2022. The extreme night temperatures ranged from a low of 1°C to a high of 16°C.
Check out the climate of Viana do Castelo for all months and discover the best travel time
Curious about the climate in other parts of Portugal? Check out the weather and climate in places like Algarve, Lisbon, Albufeira, or have a look at other destinations in Portugal.
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Daily Temperature in December in Viana do Castelo
This chart shows the average daily temperatures, both day and night, for each day in December in Viana do Castelo, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in December in Viana do Castelo
The chart below shows the average daily precipitation in December for Viana do Castelo, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for December, you can expect around 14 days of rain in Viana do Castelo.
Daily UV Index in December in Viana do Castelo
This chart shows the average daily UV index in December in Viana do Castelo, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in December in Viana do Castelo Over the Years
This chart shows the average temperature in December in Viana do Castelo, measured in degrees Celsius, over the past years.
Total Precipitation in December in Viana do Castelo Over the Years
This chart shows the average precipitation in December in Viana do Castelo, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in December for Viana do Castelo
Click on a specific day in December for detailed info on the typical weather on that day in Viana do Castelo. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in December in Viana do Castelo
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Average Weather in Viana do Castelo by Month
Click on a month below to see detailed weather info for Viana do Castelo. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
Or check out the climate of Viana do Castelo for all months at once
