September 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
September is mild and ends the winter season with mostly dry weather. The humidity is bearable, while the average temperatures register in the range of 19.4°C (66.9°F) to 25.6°C (78.1°F). It is rare to have temperatures over 29.4°C (84.9°F), and the nights are mild at best.
September in Rio de Janeiro tends to be cloudy as the daily sunshine is at the lowest of the year at 4.9 hours during the 12-hour days. A light jacket is sufficient for the evenings or cold nights - even sweatshirts are enough for the majority of September in Rio.

What is the temperature in September in Rio de Janeiro?

In September, in Rio de Janeiro, the average high-temperature is 25.4°C (77.7°F), and the average low-temperature is 19.2°C (66.6°F).

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

In Rio de Janeiro, in September, it is raining for 7 days, with typically 53.6mm (2.1") of accumulated precipitation.

What month is the sea coldest in Rio de Janeiro?

With an average sea temperature of 21.6°C (70.9°F), September is the month with the coldest seawater in Rio de Janeiro, Brazil. For most, swimming in 21.6°C (70.9°F) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 21°C (69.8°F) to 15°C (59°F).

How cold is the water in September in Rio de Janeiro?

In Rio de Janeiro, Brazil, in September, the average water temperature is 21.6°C (70.9°F). For most, swimming in 21.6°C (70.9°F) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 21°C (69.8°F) to 15°C (59°F).
Average temperature in September - Rio de Janeiro, Brazil
  • Average high temperature in September: 25.4°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 September: 19.2°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 September - Rio de Janeiro, Brazil
  • Average humidity in September: 79%

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 September - Rio de Janeiro, Brazil
  • Average rainfall in September: 53.6mm

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 September - Rio de Janeiro, Brazil
  • Average rainfall days in September: 7 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 September - Rio de Janeiro, Brazil
  • Average sea temperature in September: 21.6°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 September / Average sunshine in September - Rio de Janeiro, Brazil
  • Average daylight in September: 12h

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 September: 4.9h

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 September - Rio de Janeiro, Brazil
  • Average UV index in September: 10

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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