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December Weather in Viseu, Portugal

Last updated: August 27, 2025

In December, the average temperature in Viseu, Portugal hovers around 8°C (47°F), with a chilly minimum of -2°C (28°F) and a pleasant maximum of 17°C (63°F). Expect rainy days, as 174 mm (6.8 in) of precipitation often falls over the course of 13 days. With an average humidity of 87%, it’s a month where cozy layers and an umbrella will be your best companions!

December Temperature in Viseu

In December in Viseu, the average temperature is 8°C (47°F). Maximum temperatures can reach 17°C (63°F), while minimums can drop as low as -2°C (28°F). Be prepared for a diverse range of weather conditions when traveling this month.

December Weather in Viseu: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Viseu, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Viseu, December typically has an average temperature of 8°C (47°F), with highs reaching up to 17°C (63°F) and lows dropping to around -2°C (28°F).
JanFebMarAprMayJunJulAugSepOctNovDec444850546064696966595047
Data source: Temperature data for Viseu generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Viseu

In Viseu in December, the total precipitation amount is 174 mm (6.8 in), which occurs over the course of 13 days.

December Precipitation Trends in Viseu

The chart displays monthly precipitation patterns in Viseu, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Viseu, December typically receives around 174 mm (6.8 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec851341521456849191947108149174
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Viseu

In Viseu in December, humidity is 87%. With an average temperature of 8°C (47°F), this humidity feels like a damp chill that clings to your skin, making outdoor exploration uncomfortably muggy despite the cool air.

December Average Humidity in Viseu

This chart illustrates the average monthly humidity levels in Viseu, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Viseu is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%81%78%79%78%71%63%64%71%79%86%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Viseu

In Viseu in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Viseu, you can visit Hourly UV Index in Viseu.

Maximum UV Index Levels in Viseu for December

The chart shows the monthly maximum UV Index (UVI) for Viseu in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Viseu typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec346910111098642
Data source: Viseu December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How December Weather in Viseu Compares to Other Months

Weather in Viseu varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Viseu, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Viseu, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (44°F)85 mm (3.3 inches)87%moderate
February Weather9°C (48°F)134 mm (5.3 inches)81%moderate
March Weather10°C (50°F)152 mm (6.0 inches)78%high
April Weather12°C (54°F)145 mm (5.7 inches)79%very high
May Weather16°C (60°F)68 mm (2.7 inches)78%very high
June Weather18°C (64°F)49 mm (1.9 inches)71%extreme
July Weather20°C (69°F)19 mm (0.7 inches)63%very high
August Weather21°C (69°F)19 mm (0.8 inches)64%very high
September Weather19°C (66°F)47 mm (1.8 inches)71%very high
October Weather15°C (59°F)108 mm (4.3 inches)79%high
November Weather10°C (50°F)149 mm (5.9 inches)86%moderate
December Weather8°C (47°F)174 mm (6.8 inches)87%low

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