December weather forecast
Brazil

December brings the onset of summer in Brazil, with temperatures in the northern regions and the Amazon Basin hitting their peak. Daytime temperatures frequently reach over 30°C (86°F), making for hot and humid conditions. Evenings provide a slight respite with marginally cooler temperatures, although the overall warmth is still palpable.

Coastal cities like Rio de Janeiro experience a further increase in temperatures, with the average ranging from 22.8°C (73°F) to 27.2°C (81°F). As the north-central coast of Brazil enters the peak of its sea temperatures, marine activities flourish, and coastal tourism thrives.

In the south, the approach of summer is more pronounced. Regions south of the Tropic of Capricorn undergo a substantial rise in temperatures, indicating the definitive onset of summer. The highlands and mountains, now devoid of winter's frost and snow, exhibit a warm climate conducive to outdoor activities.

Rainfall in December is characteristic of the peak wet season. The Amazon region experiences some of its highest annual rainfall totals, while the northeastern regions continue to see substantial precipitation. Rainfall across Brazil reaches its zenith in December, contributing significantly to the annual rainfall totals. As such, December is the beginning of the rainiest quarter of the year in Brazil, setting the stage for lush landscapes and thriving flora and fauna.

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• São Paulo - December »
  January through March, November and December, with an average maximum UV index of 12, are months with the highest UV index in São Paulo, Brazil. With an average of 13h and 36min of daylight, December has the longest days of the year in São Paulo.
• Rio de Janeiro - December »
  With an average of 13h and 30min of daylight, December has the longest days of the year in Rio de Janeiro, Brazil. In Rio de Janeiro, during December, the rain falls for 21.9 days and regularly aggregates up to 98mm (3.86") of precipitation.
• Brasília - December »
  December has the longest days of the year in Brasília, Brazil, with an average of 13h and 6min of daylight. In Brasília in December, during 27.5 rainfall days, 181mm (7.13") of precipitation is typically accumulated.
• Salvador - December »
  In Salvador during December, the rain falls for 10 days and regularly aggregates up to 143mm (5.63") of precipitation. The month with the longest days in Salvador is December, with an average of 12h and 54min of daylight.
• Fortaleza - December »
  On the first day of December in Fortaleza sunrise is at 05:13 and sunset at 17:33. With an average of 12h and 18min of daylight, December has the longest days of the year in Fortaleza.
• Belo Horizonte - December »
  The month with the most rainfall in Belo Horizonte is December, when the rain falls for 20 days and typically aggregates up to 319mm (12.56") of precipitation. On the first day of December in Belo Horizonte sunrise is at 05:07 and sunset at 18:22.
• Manaus - December »
  On the first day of December in Manaus sunrise is at 05:40 and sunset at 17:58. The month with the longest days in Manaus is December, with an average of 12h and 18min of daylight.
• Curitiba - December »
  The month with the longest days in Curitiba is December, with an average of 13h and 42min of daylight. In Curitiba, during December, the rain falls for 13 days and regularly aggregates up to 152mm (5.98") of precipitation.
• Recife - December »
  The months with the highest UV index in Recife are January through April, September through December, with an average maximum UV index of 12. December has the longest days of the year in Recife, Brazil, with an average of 12h and 36min of daylight.
• Porto Alegre - December »
  The month with the longest days in Porto Alegre, Brazil, is December, with an average of 14h and 0min of daylight. The least humid month in Porto Alegre is December, with an average relative humidity of 71%.
• Goiânia - December »
  The month with the most rainfall in Goiânia is December, when the rain falls for 19 days and typically aggregates up to 268mm (10.55") of precipitation. February and December, with an average relative humidity of 76%, are the most humid months in Goiânia, Brazil.
• Guarulhos - December »
  December in Guarulhos culminates in the height of summer, with the year's highest temperature and rainfall parameters coming into play. In December, in Guarulhos, the rain falls for 13 days.