September weather forecast
Buenos Aires, Argentina

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The Congress Square monument in Buenos Aires, Argentina
The Congress Square monument in Buenos Aires, Argentina

Weather in September

September brings the onset of spring to Buenos Aires. The temperatures continue to warm up, showing average highs and lows of 18.2°C and 10.4°C respectively. It is marked by increasing daylight hours and rising sea temperatures, signaling the end of winter. Rainfall is moderate, keeping the humidity at bay. Winds remain gentle, giving rise to comfortable and mild spring weather in the city.

Temperature

The arrival of September sees a recorded average high-temperature of a still enjoyable 18.2°C, showing little divergence from the previous month's conditions. In September, the nighttime temperature lowers to an average of 10.4°C.

Humidity

In Buenos Aires, the average relative humidity in September is 74%.

Rainfall

In Buenos Aires, in September, during 9 rainfall days, 44mm of precipitation is typically accumulated. Throughout the year, in Buenos Aires, there are 108.2 rainfall days, and 629mm of precipitation is accumulated.

Sea temperature

In Buenos Aires, Argentina, the average seawater temperature in September is 14.2°C.
Note: Taking a dip in 14.2°C can be perilous. Submersion in temperatures under 10°C triggers severe cold shock accompanied by hyperventilation.

Daylight

In September, the average length of the day in Buenos Aires is 11h and 53min.
On the first day of the month, sunrise is at 07:12 and sunset at 18:34. On the last day of September, sunrise is at 06:31 and sunset at 18:55 -03.

Sunshine

In September, the average sunshine in Buenos Aires is 7.8h.

UV index

The average daily maximum UV index in September in Buenos Aires is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 4 in September transforms into the following instructions:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
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FAQ

What is the temperature in September in Buenos Aires?

In Buenos Aires, in September, the average high-temperature is 18.2°C, and the average low-temperature is 10.4°C. In February, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which factors the actual air temperature with the relative humidity, is computed to be 32°C.

What is the average humidity in September in Buenos Aires?

The average relative humidity in September in Buenos Aires, Argentina, is 74%.

How much does it rain in Buenos Aires in September?

In September, in Buenos Aires, the rain falls for 9 days. Throughout September, 44mm of precipitation is accumulated.

What is the sea water temperature in September in Buenos Aires?

In September, the average sea temperature in Buenos Aires, Argentina, is 14.2°C. Swimming in 14.2°C is considered life-threatening. Even a few minutes in 13°C water is uncomfortable, and swimming below 10°C may cause total loss of breathing control and cold shock, depending on a person's physique.

How many hours of daylight does Buenos Aires have in September?

In September, the average day length is 11h and 53min.

When are sunrise and sunset in September in Buenos Aires?

On the first day of September, sunrise is at 07:12 and sunset at 18:34. On the last day of the month, sunrise is at 06:31 and sunset at 18:55 -03.

How many hours of sunshine does Buenos Aires have in September?

The average sunshine duration in September in Buenos Aires, Argentina, is 7.8h.

How high is the UV index in September in Buenos Aires?

In Buenos Aires, Argentina, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate health threat from exposure to Sun's UV rays.
Average high temperature
Average low temperature
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
Average rainfall days
Average sea temperature
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Buenos Aires, Argentina

Average temperature in September - Buenos Aires, Argentina
  • Average high temperature in September: 18.2°C

The warmest month (with the highest average high temperature) is January (30.9°C).
The month with the lowest average high temperature is July (14°C).

  • Average low temperature in September: 10.4°C

The month with the highest average low temperature is January (20°C).
The coldest month (with the lowest average low temperature) is July (8.1°C).

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Average pressure in September
Buenos Aires, Argentina

Average pressure in September - Buenos Aires, Argentina
  • Average pressure in September: 1017.9mbar

The month with the highest atmospheric pressure is July (1019.2mbar).
The month with the lowest atmospheric pressure is December (1011mbar).

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Average wind speed in September
Buenos Aires, Argentina

Average wind speed in September - Buenos Aires, Argentina
  • Average wind speed in September: 15.8km/h

The windiest month (with the highest average wind speed) is September (15.8km/h).
The calmest month (with the lowest average wind speed) is March (13.2km/h).

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Average humidity in September
Buenos Aires, Argentina

Average humidity in September - Buenos Aires, Argentina
  • Average humidity in September: 74%

The month with the highest relative humidity is May (76%).
The month with the lowest relative humidity is January (56%).

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Average rainfall in September
Buenos Aires, Argentina

Average rainfall in September - Buenos Aires, Argentina
  • Average rainfall in September: 44mm

The wettest month (with the highest rainfall) is November (78mm).
The driest month (with the least rainfall) is June (38mm).

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Average rainfall days in September
Buenos Aires, Argentina

Average rainfall days in September - Buenos Aires, Argentina
  • Average rainfall days in September: 9 days

The month with the highest number of rainy days is October (10.8 days).
The month with the least rainy days is August (7 days).

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Average sea temperature in September
Buenos Aires, Argentina

Average sea temperature in September - Buenos Aires, Argentina
  • Average sea temperature in September: 14.2°C

The best month for swimming (with the highest average sea temperature) is January (25°C).
The coldest month (with the lowest average sea temperature) is July (11.9°C).

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Average daylight in September /
Average sunshine in September
Buenos Aires, Argentina

Average daylight in September / Average sunshine in September - Buenos Aires, Argentina
  • Average daylight in September: 11h and 5min

The month with the longest days is December (Average daylight: 14h and 24min).
The month with the shortest days is June (Average daylight: 9h and 54min).

  • Average sunshine in September: 7h and 5min

The month with the most sunshine is December (Average sunshine: 11h and 12min).
The month with the least sunshine is June (Average sunshine: 5h and 48min).

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Average sunshine days in September
Buenos Aires, Argentina

Average sunshine days in September - Buenos Aires, Argentina
  • Average sunshine days in September: 18.4 days

The month with the most sunshine days is January (21.6 days).
The month with the least sunshine days is October (17.4 days).

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Average UV index in September
Buenos Aires, Argentina

Average UV index in September - Buenos Aires, Argentina
  • Average UV index in September: 4

The month with the highest UV index is January (UV index 7).
The months with the lowest UV index are June and July (UV index 3).

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Average cloud cover in September
Buenos Aires, Argentina

Average cloud cover in September - Buenos Aires, Argentina
  • Average cloud cover in September: 33

The month with the most cloud cover is July (Cloud cover 37).
The month with the least cloud cover is January (Cloud cover 17).

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Average visibility in September
Buenos Aires, Argentina

Average visibility in September - Buenos Aires, Argentina
  • Average visibility in September: 10km

The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (10km).
The month with the lowest visibility is July (9km).

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Buenos Aires, Argentina

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