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December Weather in Castelo, Brazil

Last updated: August 22, 2025

In December, the average temperature in Castelo, Brazil hovers around 23°C (74°F), with a minimum of 13°C (55°F) and a maximum reaching 32°C (91°F). Be prepared for some rain, as 175 mm (6.9 in) of precipitation typically falls over 18 days. The air carries a notable average humidity of 72%, promising a warm and tropical feel throughout the month.

December Temperature in Castelo

In December, in Castelo, the average temperature is 23°C (74°F). Maximums can reach 32°C (91°F), while minimums can drop as low as 13°C (55°F). This pleasant weather makes it an ideal time for travelers to explore and enjoy outdoor activities.

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

The chart illustrates December temperature patterns in Castelo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Castelo, December typically has an average temperature of 23°C (74°F), with highs reaching up to 32°C (91°F) and lows dropping to around 13°C (55°F).
JanFebMarAprMayJunJulAugSepOctNovDec767574716766646570727173
Data source: Temperature data for Castelo 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 Castelo

In Castelo in December, the precipitation amount is 175 mm (6.9 in) spread over 18 days.

December Precipitation Trends in Castelo

The chart displays monthly precipitation patterns in Castelo, 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 Castelo, December typically receives around 175 mm (6.9 inches) of precipitation spread over approximately 18 days.
JanFebMarAprMayJunJulAugSepOctNovDec86176131764624183350114167175
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Castelo

In Castelo in December humidity is 72%. With an average temperature of 23°C (74°F), this humidity feels like a warm, enveloping blanket that clings to the skin, making outdoor activities a challenge but offering a refreshing atmosphere for leisurely strolls in the shade.

December Average Humidity in Castelo

This chart illustrates the average monthly humidity levels in Castelo, 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 Castelo is approximately 72%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%85%86%85%82%81%79%75%72%67%69%72%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Castelo

In Castelo in December, the maximum UV index is 16, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, making it crucial to take protective measures. For detailed information, you can refer to the Hourly UV Index in Castelo.

Maximum UV Index Levels in Castelo for December

The chart shows the monthly maximum UV Index (UVI) for Castelo 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 Castelo typically reaches 16, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec161514129781012141516
Data source: Castelo 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 Castelo Compares to Other Months

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

This table compares monthly weather conditions in Castelo, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather25°C (77°F)86 mm (3.4 inches)80%extreme
February Weather24°C (75°F)176 mm (6.9 inches)85%extreme
March Weather23°C (74°F)131 mm (5.1 inches)86%extreme
April Weather22°C (71°F)76 mm (3.0 inches)85%extreme
May Weather20°C (68°F)46 mm (1.8 inches)82%very high
June Weather19°C (67°F)24 mm (1.0 inches)81%high
July Weather18°C (64°F)18 mm (0.7 inches)79%very high
August Weather18°C (65°F)33 mm (1.3 inches)75%very high
September Weather21°C (70°F)50 mm (2.0 inches)72%extreme
October Weather22°C (72°F)114 mm (4.5 inches)66%extreme
November Weather22°C (71°F)167 mm (6.6 inches)69%extreme
December Weather23°C (74°F)175 mm (6.9 inches)72%extreme

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