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

May weather forecast and climate
Rio de Janeiro, Brazil

The last month of the autumn, May, is another warm month in Rio de Janeiro, Brazil, with average temperature ranging between min 19.7°C (67.5°F) and max 25.2°C (77.4°F).

Temperature

In May, the average high-temperature is relatively the same as in April - a still warm 25.2°C (77.4°F). The average low-temperature, in Rio de Janeiro, is 19.7°C (67.5°F).

Humidity

The average relative humidity in Rio de Janeiro is 80%.

Rainfall

In Rio de Janeiro, Brazil, during 12.8 rainfall days, 51mm (2.01") of precipitation is typically accumulated. Throughout the year, in Rio de Janeiro, there are 192.5 rainfall days, and 812mm (31.97") of precipitation is accumulated.

Sea temperature

In Rio de Janeiro, the average water temperature is 24.3°C (75.7°F).
Note: Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 24.3°C (75.7°F) water may be enjoyable. (FYI: The official water temperature required for the Olympic swimming competition is 25°C (77°F) to 28°C (82.4°F).)

Daylight

In Rio de Janeiro, the average length of the day is 11h.

Sunshine

The average sunshine in May is 8.4h.

UV index

The average daily maximum UV index in May is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from the exposure to the Sun's UV radiation for the ordinary person.
Note: In May, the average maximum UV index of 6 translate into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. 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. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.

What is the temperature in May in Rio de Janeiro?

In Rio de Janeiro, in May, the average high-temperature is 25.2°C (77.4°F), and the average low-temperature is 19.7°C (67.5°F).

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

The average relative humidity in May in Rio de Janeiro, Brazil, is 80%.

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

In Rio de Janeiro, in May, during 12.8 rainfall days, 51mm (2.01") of precipitation is typically accumulated.

What is the sea temperature in May in Rio de Janeiro?

In May, the average sea temperature in Rio de Janeiro, Brazil, is 24.3°C (75.7°F). A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 24.3°C (75.7°F) water.

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

In May, the average length of the day in Rio de Janeiro is 11h.

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

In Rio de Janeiro, Brazil, the average sunshine in May is 8.4h.

What is the UV index intensity in May in Rio de Janeiro?

The average daily maximum UV index in May in Rio de Janeiro, Brazil, is 6. A UV Index of 6 to 7 symbolizes a high hazard to health from unprotected exposure to the UV radiation.
Average temperature in May - Rio de Janeiro, Brazil
  • Average high temperature in May: 25.2°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 May: 19.7°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 May - Rio de Janeiro, Brazil
  • Average humidity in May: 80%

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

Average rainfall in May - Rio de Janeiro, Brazil
  • Average rainfall in May: 51mm

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

Average rainfall days in May - Rio de Janeiro, Brazil
  • Average rainfall days in May: 12.8 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 May - Rio de Janeiro, Brazil
  • Average sea temperature in May: 24.3°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 May / Average sunshine in May - Rio de Janeiro, Brazil
  • Average daylight in May: 11h

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 May: 8.4h

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 May - Rio de Janeiro, Brazil
  • Average UV index in May: 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).