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December Weather in Viseu, Brazil

Last updated: August 22, 2025

In December, the average temperature in Viseu, Brazil hovers around 27°C (81°F), making it a warm destination to visit. Temperatures can range from a comfortable 22°C (72°F) to a sizzling 33°C (92°F). However, be prepared for some rain, as the region experiences 130 mm (5.1 in) of precipitation over approximately 21 days. With an average humidity of 84%, it's the perfect time to enjoy the warmth while staying refreshed!

December Temperature in Viseu

In December in Viseu, the average temperature is 27°C (81°F). The maximum can reach 33°C (92°F), while the minimum can be as low as 22°C (72°F). This mild and warm climate makes it an ideal destination for outdoor activities and sightseeing.

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 27°C (81°F), with highs reaching up to 33°C (92°F) and lows dropping to around 22°C (72°F).
JanFebMarAprMayJunJulAugSepOctNovDec797978797980798081828281
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 precipitation amount reaches 130 mm (5.1 in) over the course of 21 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 130 mm (5.1 inches) of precipitation spread over approximately 21 days.
JanFebMarAprMayJunJulAugSepOctNovDec24161660253836619713166433955130
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 84%. With an average temperature of 27°C (81°F), this humidity feels like walking through a warm, moist blanket, making travel uncomfortable and sticky, as every step seems to weigh you down with the heavy 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 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%84%84%87%87%83%81%79%78%77%78%84%
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 reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the 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 13, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec141516161412111313131313
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 Weather26°C (79°F)241 mm (9.5 inches)87%extreme
February Weather26°C (79°F)616 mm (24.3 inches)84%extreme
March Weather26°C (79°F)602 mm (23.7 inches)84%extreme
April Weather26°C (79°F)537 mm (21.2 inches)87%extreme
May Weather26°C (80°F)366 mm (14.4 inches)87%extreme
June Weather26°C (80°F)197 mm (7.8 inches)83%extreme
July Weather26°C (80°F)131 mm (5.2 inches)81%extreme
August Weather27°C (80°F)66 mm (2.6 inches)79%extreme
September Weather27°C (81°F)43 mm (1.7 inches)78%extreme
October Weather28°C (82°F)39 mm (1.5 inches)77%extreme
November Weather28°C (82°F)55 mm (2.2 inches)78%extreme
December Weather27°C (81°F)130 mm (5.1 inches)84%extreme

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