Rio de Janeiro
Brazil
Long-term weather forecast
Long-term weather forecast

August weather forecast and climate
Rio de Janeiro, Brazil

The last month of the winter, August, is also a moderately hot month in Rio de Janeiro, Brazil, with average temperature varying between 18.5°C (65.3°F) and 24.3°C (75.7°F).

Temperature

In August, the average high-temperature is essentially the same as in July - a still moderately hot 24.3°C (75.7°F). In August, in Rio de Janeiro, the average low-temperature is 18.5°C (65.3°F).

Humidity

The least humid month is August, with an average relative humidity of 76%.

Rainfall

In August, in Rio de Janeiro, the rain falls for 10.4 days. Throughout August, 35mm (1.38") of precipitation is accumulated. Throughout the year, there are 192.5 rainfall days, and 812mm (31.97") of precipitation is accumulated.

Sea temperature

In August, the average sea temperature is 22.3°C (72.1°F).
Note: For individuals prone to feeling cold, swimming in 23°C (73.4°F) is still regarded as intolerable. A wetsuit is not a necessity, but sunshine, wind, and air temperature are essential factors for relishing swimming at 22.3°C (72.1°F).

Daylight

In Rio de Janeiro, the average length of the day is 11.4h.

Sunshine

In Rio de Janeiro, the average sunshine is 7.8h.

UV index

In Rio de Janeiro, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high health hazard from unsafe exposure to the UV radiation for the ordinary person.
Note: The average daily UV index of 6 in August transform into the following instructions:
Take precautions against overexposure. Protection against sun damage is needed. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.

What is the temperature in August in Rio de Janeiro?

In Rio de Janeiro, in August, the average high-temperature is 24.3°C (75.7°F), and the average low-temperature is 18.5°C (65.3°F).

What is the least humid month in Rio de Janeiro?

August is the least humid month in Rio de Janeiro, with an average relative humidity of 76%.

What is the average humidity in August in Rio de Janeiro?

In August, the average relative humidity in Rio de Janeiro, Brazil, is 76%.

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

In Rio de Janeiro, Brazil, in August, during 10.4 rainfall days, 35mm (1.38") of precipitation is typically accumulated.

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

In August, the average sea temperature in Rio de Janeiro, Brazil, is 22.3°C (72.1°F). For individuals prone to feeling cold, swimming in 23°C (73.4°F) is still regarded as intolerable. A wetsuit is not a necessity, but sunshine, wind, and air temperature are essential factors for relishing swimming at 22.3°C (72.1°F).

What is the average length of the day in August in Rio de Janeiro?

The average length of the day in August in Rio de Janeiro is 11.4h.

How many hours of sunshine does Rio de Janeiro have in August?

In Rio de Janeiro, the average sunshine in August is 7.8h.

What is the UV index reading in August in Rio de Janeiro?

In Rio de Janeiro, the average daily maximum UV index in August is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to the Sun's UV rays.
Average temperature in August - Rio de Janeiro, Brazil
  • Average high temperature in August: 24.3°C

The warmest month (with the highest average high temperature) is February (29.7°C).
The month with the lowest average high temperature is July (24°C).

  • Average low temperature in August: 18.5°C

The month with the highest average low temperature is January (23.7°C).
The coldest month (with the lowest average low temperature) is August (18.5°C).

Average humidity in August - Rio de Janeiro, Brazil
  • Average humidity in August: 76%

The month with the highest relative humidity is November (82%).
The month with the lowest relative humidity is August (76%).

Average rainfall in August - Rio de Janeiro, Brazil
  • Average rainfall in August: 35mm

The wettest month (with the highest rainfall) is November (119mm).
The driest month (with the least rainfall) is June (29mm).

Average rainfall days in August - Rio de Janeiro, Brazil
  • Average rainfall days in August: 10.4 days

The month with the highest number of rainy days is March (22.7 days).
The month with the least rainy days is July (9.3 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 the shortest days is June (Average daylight: 10.7h).

  • Average sunshine in August: 7.8h

The month with the most sunshine is February (Average sunshine: 8.8h).
The month with the least sunshine is October (Average sunshine: 7.5h).

Average UV index in August - Rio de Janeiro, Brazil
  • Average UV index in August: 6

The month with the highest UV index is January (UV index 7).
The month with the lowest UV index is September (UV index 5).