September weather forecast and climate
Porto Alegre, Brazil

What is the temperature in September in Porto Alegre?

In Porto Alegre, Brazil, in September, the average high-temperature is 21.8°C (71.2°F), and the average low-temperature is 13.1°C (55.6°F).

How much does it rain in Porto Alegre in September?

In September, the rain falls for 10 days. Throughout September, 142.2mm (5.6") of precipitation is accumulated.

What is the wettest month in Porto Alegre?

The month with the most rainfall in Porto Alegre, Brazil, is September when the rain falls for 10 days and typically aggregates up to 142.2mm (5.6") of precipitation.

How cold is the water in September in Porto Alegre?

The average seawater temperature, in September, in Porto Alegre, is 16.3°C (61.3°F). For swimming, a surface water temperature of 16.3°C (61.3°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).
Average temperature in September - Porto Alegre, Brazil
  • Average high temperature in September: 21.8°C

The warmest month (with the highest average high temperature) is January (30.2°C).
The month with the lowest average high temperature is June (19.4°C).

  • Average low temperature in September: 13.1°C

The month with the highest average low temperature is February (20.8°C).
Coldest months (with the lowest average low temperature) are June and July (10.7°C).

Average humidity in September - Porto Alegre, Brazil
  • Average humidity in September: 78%

The month with the highest relative humidity is June (82%).
The month with the lowest relative humidity is December (69%).

Average rainfall in September - Porto Alegre, Brazil
  • Average rainfall in September: 142.2mm

The wettest month (with the highest rainfall) is September (142.2mm).
The driest month (with the lowest rainfall) is April (77.3mm).

Average rainfall days in September - Porto Alegre, Brazil
  • Average rainfall days in September: 10 days

The month with the highest number of rainy days is September (10 days).
Months with the lowest number of rainy days are April and December (7 days).

Average sea temperature in September - Porto Alegre, Brazil
  • Average sea temperature in September: 16.3°C

The best month for swimming (with the highest average sea temperature) is January (24.7°C).
The coldest month (with the lowest average sea temperature) is August (15.8°C).

Average daylight in September / Average sunshine in September - Porto Alegre, Brazil
  • Average daylight in September: 11.9h

The month with the longest days is December (Average daylight: 14.1h).
The month with shortest days is June (Average daylight: 10.2h).

  • Average sunshine in September: 5h

The month with most sunshine is December (Average sunshine: 7.9h).
The month with least sunshine is June (Average sunshine: 4.5h).

Average UV index in September - Porto Alegre, Brazil
  • Average UV index in September: 7

Months with the highest UV index are January, February, November and December (UV index 12).
Months with the lowest UV index are June and July (UV index 3).

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