December weather forecast and climate
Rio de Janeiro, Brazil

Christ the Redeemer statue atop Mount Corcovado, overlooking the seaside city of Rio de Janeiro, Brazil
Christ the Redeemer statue atop Mount Corcovado, overlooking the seaside city of Rio de Janeiro, Brazil
December starts the hot summer with humid conditions in Rio de Janeiro. The average temperatures are in the range of 22.2°C (72°F) to 28.3°C (82.9°F), but the mugginess increases the heat quotient more than the temperature.
Summer brings heavy rainfall, and December registers an average of 134.6mm (5.3") with a chance of thunderstorms. Floods and landslides are a possibility as the tropical monsoon type of rainfall lashes the city heavily. The mountains provide a barrier to the rain, while the Atlantic Ocean serves as a thermal regulator to keep the temperatures mostly below 37.8°C (100°F).
Pack raincoats and umbrellas for Christmas trips to Rio.

What is the temperature in December in Rio de Janeiro?

In Rio de Janeiro, in December, the average high-temperature is 28.6°C (83.5°F), and the average low-temperature is 22.4°C (72.3°F).

How many days does it rain in December in Rio de Janeiro?

In Rio de Janeiro, during December, the rain falls for 11 days and regularly aggregates up to 134.2mm (5.3") of precipitation.
Average temperature in December - Rio de Janeiro, Brazil
  • Average high temperature in December: 28.6°C

Warmest months (with the highest average high temperature) are January and February (30.2°C).
The month with the lowest average high temperature is July (25°C).

  • Average low temperature in December: 22.4°C

The month with the highest average low temperature is February (23.5°C).
The coldest month (with the lowest average low temperature) is July (18.4°C).

Average humidity in December - Rio de Janeiro, Brazil
  • Average humidity in December: 80%

Months with the highest relative humidity are March, April, May, October and December (80%).
Months with the lowest relative humidity are July and August (77%).

Average rainfall in December - Rio de Janeiro, Brazil
  • Average rainfall in December: 134.2mm

The wettest month (with the highest rainfall) is January (137.1mm).
The driest month (with the lowest rainfall) is July (41.9mm).

Average rainfall days in December - Rio de Janeiro, Brazil
  • Average rainfall days in December: 11 days

Months with the highest number of rainy days are January and December (11 days).
The month with the lowest number of rainy days is July (4 days).

Average sea temperature in December - Rio de Janeiro, Brazil
  • Average sea temperature in December: 24°C

The best month for swimming (with the highest average sea temperature) is March (25.8°C).
The coldest month (with the lowest average sea temperature) is September (21.6°C).

Average daylight in December / Average sunshine in December - Rio de Janeiro, Brazil
  • Average daylight in December: 13.5h

The month with the longest days is December (Average daylight: 13.5h).
The month with shortest days is June (Average daylight: 10.7h).

  • Average sunshine in December: 5.8h

The month with most sunshine is February (Average sunshine: 7.2h).
Months with least sunshine are September and October (Average sunshine: 4.9).

Average UV index in December - Rio de Janeiro, Brazil
  • Average UV index in December: 12

Months with the highest UV index are January, February, March, November and December (UV index 12).
Months with the lowest UV index are June and July (UV index 5).

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