August 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
August is a balmy winter month in Rio de Janeiro as the average temperatures remain in the 18.9°C (66°F) to 25.6°C (78.1°F) range, and the humidity drops to the lowest of the year at 77%. The scarce rainfall means mostly clear days in August with beautiful sunshine and fogless view of the mountains.
The city offers plenty of entertainment and places to explore, although the visitors prefer the beaches with seawater temperatures at the lowest of the year at 22.2°C (72°F). August is one of the best times to visit Rio due to mild weather conditions.

What is the temperature in August in Rio de Janeiro?

The average high-temperature, in August, in Rio de Janeiro, is 25.5°C (77.9°F), while the average low-temperature is 18.9°C (66°F).

How much does it rain in Rio de Janeiro in August?

In Rio de Janeiro, Brazil, in August, during 5 rainfall days, typically, 44.5mm (1.8") of precipitation is accumulated.

How warm is the water in August in Rio de Janeiro?

In August, in Rio de Janeiro, the average sea temperature is 22.3°C (72.1°F). A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 22.3°C (72.1°F) water. The Olympic swimming competition requires a water temperature between 25°C (77°F) and 28°C (82.4°F).
Average temperature in August - Rio de Janeiro, Brazil
  • Average high temperature in August: 25.5°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 August: 18.9°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 August - Rio de Janeiro, Brazil
  • Average humidity in August: 77%

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 August - Rio de Janeiro, Brazil
  • Average rainfall in August: 44.5mm

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 August - Rio de Janeiro, Brazil
  • Average rainfall days in August: 5 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 August - Rio de Janeiro, Brazil
  • Average sea temperature in August: 22.3°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 August / Average sunshine in August - Rio de Janeiro, Brazil
  • Average daylight in August: 11.4h

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 August: 6h

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 August - Rio de Janeiro, Brazil
  • Average UV index in August: 7

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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