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

March weather forecast and climate
Rio de Janeiro, Brazil

The first month of the autumn, March, is still a warm month in Rio de Janeiro, Brazil, with average temperature fluctuating between 28.3°C (82.9°F) and 22.9°C (73.2°F).

Temperature

In March, the average high-temperature is almost the same as in February - a still warm 28.3°C (82.9°F). In Rio de Janeiro, in March, the average low-temperature is 22.9°C (73.2°F).

Heat index

In March, the average heat index is evaluated at a hot 33°C (91.4°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Note that heat index values are valued for light wind and location in the shade. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'apparent temperature', 'felt air temperature', or 'real feel', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (metabolic differences, wind, clothing). Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

In Rio de Janeiro, the average relative humidity is 81%.

Rainfall

In Rio de Janeiro, in March, during 22.7 rainfall days, 85mm (3.35") of precipitation is typically accumulated. In Rio de Janeiro, during the entire year, the rain falls for 192.5 days and collects up to 812mm (31.97") of precipitation.

Sea temperature

With an average sea temperature of 25.8°C (78.4°F), March is the month with the warmest seawater in Rio de Janeiro.
Note: For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

In Rio de Janeiro, Brazil, the average length of the day is 12.2h.

Sunshine

In Rio de Janeiro, the average sunshine is 8.3h.

UV index

In March, the average daily maximum UV index in Rio de Janeiro, Brazil, is 6. A UV Index of 6 to 7 symbolizes a high threat to health from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 6 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.

What is the temperature in March in Rio de Janeiro?

The average high-temperature, in March, in Rio de Janeiro, Brazil, is 28.3°C (82.9°F), while the average low-temperature is 22.9°C (73.2°F). The average heat index (a.k.a. 'real feel', 'feels like'), that combines relative humidity and air temperature, in March is estimated at 33°C (91.4°F).

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

In March, the average relative humidity in Rio de Janeiro, Brazil, is 81%.

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

In Rio de Janeiro, in March, it is raining for 22.7 days, with typically 85mm (3.35") of accumulated precipitation.

What month is the sea warmest in Rio de Janeiro?

The month with the warmest seawater in Rio de Janeiro, Brazil, is March, with an average sea temperature of 25.8°C (78.4°F).

What is the sea water temperature in March in Rio de Janeiro?

In Rio de Janeiro, Brazil, the average seawater temperature in March is 25.8°C (78.4°F). For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

How many hours of daylight does Rio de Janeiro have in March?

The average length of the day in March in Rio de Janeiro, Brazil, is 12.2h.

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

The average sunshine in March in Rio de Janeiro is 8.3h.

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

In March, the average daily maximum UV index in Rio de Janeiro is 6. A UV Index reading of 6 to 7 represents a high health threat from unsafe exposure to the Sun's UV rays.
Average temperature in March - Rio de Janeiro, Brazil
  • Average high temperature in March: 28.3°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 March: 22.9°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 March - Rio de Janeiro, Brazil
  • Average humidity in March: 81%

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

Average rainfall in March - Rio de Janeiro, Brazil
  • Average rainfall in March: 85mm

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

Average rainfall days in March - Rio de Janeiro, Brazil
  • Average rainfall days in March: 22.7 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 March - Rio de Janeiro, Brazil
  • Average sea temperature in March: 25.8°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 March / Average sunshine in March - Rio de Janeiro, Brazil
  • Average daylight in March: 12.2h

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 March: 8.3h

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