Climate and monthly 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

The climate of Buenos Aires

Buenos Aires, the capital city of Argentina, sits within a climatic zone described as Humid subtropical with no dry season, also known as Cfa according to the Köppen climate classification. This vibrant city endures a wide range of weather conditions throughout the year.

Temperature fluctuations are relatively moderate across the year, with the highest average temperature peaking at 30.9°C (87.6°F) in January while July is the coolest month at 14°C (57.2°F). The annual swing between the highest and lowest temperatures is narrow, demonstrating the mildness of Buenos Aires's climate.

One of the characteristic features of Buenos Aires's climate is its relatively high humidity which fluctuates from around 56% in January to 76% in May. The level of rainfall is fairly constant throughout the year, varying slightly from 38mm (1.5") in June to 78mm (3.07") in November. It is also noteworthy that the average number of rainfall days in a month ranges from 7 to 10.

One unique aspect worth mentioning is the sea temperature, which can reach a high of 25°C (77°F) in January and dip to a low of 11.9°C (53.4°F) in July. Moreover, the average wind speed varies subtly from around 13.2km/h (8.2mph) to 15.8km/h (9.8mph) over the course of the year.

The best time to visit Buenos Aires

As a premier tourist destination, the best time to visit Buenos Aires largely depends on personal preferences. However, the climate data suggests that visiting during the months of March to May and October to December might present the most enjoyable weather conditions. During these periods, the city experiences mild temperatures from around 14°C (57.2°F) to 25°C (77°F). Additionally, these months typically witness lesser rainfall, averaging between 38mm (1.5") to 59mm (2.32"), further enhancing the pleasure of sightseeing in this architectural gem of a city.

The worst time to visit Buenos Aires

Given its subtropical climate, Buenos Aires can become quite humid especially during the months of January and February, making it less than ideal for tourists who are aversive to high humidity. The temperatures during this period could soar to an average high of around 30°C (86°F), which, when combined with 56% to 61% relative humidity, might feel rather uncomfortable to some. And while the sea temperature remains warm during this period, around 25°C (77°F), it might not be enough to offset the high humidity of the city streets.

Spring weather in Buenos Aires

Spring is a delightful period in Buenos Aires with temperatures regularly ranging from 14°C (57.2°F) to 25°C (77°F). While September experiences rainfall of around 44mm (1.73"), it reduces slightly to 42mm (1.65") in October and down to 38mm (1.5") in November. The average number of sunshine hours hovers around 8 hours per day, affording plenty of daylight for outdoor activities.

Summer weather in Buenos Aires

Summer brings heat to Buenos Aires, with average daily temperatures regularly climbing to the late twenties and early thirties. Over this period, average temperatures fluctuate from around 26°C (78.8°F) in December, peaking at 30.9°C (87.6°F) in January, to 29.5°C (85.1°F) in February. Rainfall during the summer months is relatively high, with January and February seeing an average of 42mm (1.65") and 59mm (2.32") respectively.

Autumn weather in Buenos Aires

Autumn in Buenos Aires welcomes cooler weather. March sees a noticeable decrease in temperature to an average of 26.2°C (79.2°F), which falls to around 22.8°C (73°F) in April and 18.7°C (65.7°F) in May. Rainfall during these months is relatively low compared to the rest of the year, fluctuating between 46mm (1.81") to 44mm (1.73").

Winter weather in Buenos Aires

Winter in Buenos Aires is mild with temperatures typically hovering from 14°C (57.2°F) to 18.2°C (64.8°F). Rainfall during the winter months is a bit higher compared to the rest of the year, varying from 38mm (1.5") in June up to 51mm (2.01") in July. Despite the increased precipitation, with an average of 10 hours of daylight per day, the wintry days remain relatively bright.

Weather in January

January offers the peak of Buenos Aires' summer, inviting visitors with sunny days and blue skies. The city contends with the year's highest temperature, hoisting average high and low temperatures to 30.9°C (87.6°F) and 20°C (68°F) respectively. Weather in January »

Weather in February

In February, the weather in Buenos Aires remains warm, but subtly cooler than January. There is a slight drop to 29.5°C (85.1°F) in the average high temperature, while the minimum temperature remains virtually unchanged at 19.9°C (67.8°F). Weather in February »

Weather in March

MarcIn March, Buenos Aires begins to welcome autumn. The month experiences a significant drop in temperature, with the average high and low temperature dropping to 26.2°C (79.2°F) and 17.2°C (63°F) respectively. Nonetheless, the climate remains warm enough for enjoyment of outdoor activities. Weather in March »

Weather in April

April in Buenos Aires witnesses further transition into Autumn. The city experiences a continued drop in temperature, now placing the average highs and lows at 22.8°C (73°F) and 14.5°C (58.1°F) respectively. Although temperatures decrease, the city remains comfortably warm. Weather in April »

Weather in May

May brings the true feel of autumn to Buenos Aires with significantly cooler weather. Temperatures fall to 18.7°C (65.7°F) for average highs and down to 12.2°C (54°F) for lows. Ample sunshine ensures that days are mild enough for outdoor activities. Weather in May »

Weather in June

June marks the onset of winter in Buenos Aires. However, with average high and low temperatures at 14.9°C (58.8°F) and 9.1°C (48.4°F) respectively, winters here remain relatively mild. Despite shorter days, the city enjoys moderate sunshine for pleasant daytime conditions. Weather in June »

Weather in July

July is the chilliest month in Buenos Aires, with the lowest average temperatures for the year, setting at 14°C (57.2°F) for highs and 8.1°C (46.6°F) for lows. However, characterised by light to moderate winds, the winter chill remains bearable for most. Weather in July »

Weather in August

In August, Buenos Aires starts transition from winter to spring. The average high begins to rise slightly to 16.7°C (62.1°F), while the average low temperature remains relatively steady at 9.3°C (48.7°F). The weather is marked by clear skies, moderate sunshine and less humidity. Weather in August »

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 (64.8°F) and 10.4°C (50.7°F) respectively. It is marked by increasing daylight hours and rising sea temperatures, signaling the end of winter. Weather in September »

Weather in October

In October, the Buenos Aires' weather becomes more spring-like, with average temperatures further increasing to 21.1°C (70°F) for highs and 12.4°C (54.3°F) for lows. Outdoor pursuits become more inviting as the weather continues to warm. Weather in October »

Weather in November

November brings the verge of summer to Buenos Aires. The city records an average high and low temperature of 25.3°C (77.5°F) and 14.9°C (58.8°F) respectively. Despite increased rainfall levels, there's an upswing in the number of sunny days and overall daylight, painting a vibrant cityscape. Weather in November »

Weather in December

December marks the beginning of summer in Buenos Aires, completing the cycle of seasons with warmth and sunshine. Average high and low temperatures rise to 29.2°C (84.6°F) and 17.8°C (64°F) respectively. It endorses plenty of sunshine, maximizing outdoor enjoyment during longer daylight hours. Weather in December »
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Frequently asked questions

What is the hottest time of year in Buenos Aires?

The highest temperatures are recorded in January, with averages reaching a high of 30.9°C (87.6°F) and a low of 20°C (68°F).

What is the least humid month in Buenos Aires?

January is the least humid month, with an average relative humidity of 56%.

How many days does it rain in Buenos Aires?

In Buenos Aires, Argentina, during the entire year, the rain falls for 108.2 days and collects up to 629mm (24.76") of precipitation.

What month is the sea warmest in Buenos Aires?

January is the month with the warmest seawater, with an average sea temperature of 25°C (77°F).

When is the highest UV index in Buenos Aires?

January is the month with the highest UV index in Buenos Aires, with an average maximum UV index of 7.

What is the most humid month in Buenos Aires?

With an average relative humidity of 76%, May is the most humid month.

What is the driest month in Buenos Aires?

The month with the least rainfall in Buenos Aires, Argentina, is June, when the rain falls for 7.3 days and typically collects 38mm (1.5") of precipitation.

What is the month with the shortest days in Buenos Aires?

With an average of 9h and 54min of daylight, June has the shortest days of the year in Buenos Aires.

What is the month with the least sunshine in Buenos Aires?

With an average of 5.8h of sunshine, June has the least sunshine of the year in Buenos Aires, Argentina.

When is the lowest UV index in Buenos Aires?

The months with the lowest UV index are June and July, with an average maximum UV index of 3.

What time of the year is the coldest in Buenos Aires?

Buenos Aires's July weather, with an average high temperature of 14°C (57.2°F) and an average low temperature of 8.1°C (46.6°F), tends to be the coldest of the year.

When is the sea coldest in Buenos Aires?

July is the month with the coldest seawater in Buenos Aires, Argentina, with an average sea temperature of 11.9°C (53.4°F).

What is the rainiest month in Buenos Aires?

November is the month with the most rainfall. Rain falls for 10.1 days and accumulates 78mm (3.07") of precipitation.

When are the longest days in Buenos Aires?

December has the longest days of the year in Buenos Aires, with an average of 14h and 24min of daylight.

Is there Daylight Saving Time (DST) in Buenos Aires?

Buenos Aires does not utilize Daylight Saving Time (DST). -03 timezone is used over the entire year.

What month has the most sunshine in Buenos Aires?

December has the most sunshine of the year, with an average of 11.2h of sunshine.

Average temperature
Buenos Aires, Argentina

Average temperature - Buenos Aires, Argentina

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).

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
Buenos Aires, Argentina

Average pressure - Buenos Aires, Argentina

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
Buenos Aires, Argentina

Average wind speed - Buenos Aires, Argentina

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
Buenos Aires, Argentina

Average humidity - Buenos Aires, Argentina

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
Buenos Aires, Argentina

Average rainfall - Buenos Aires, Argentina

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
Buenos Aires, Argentina

Average rainfall days - Buenos Aires, Argentina

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
Buenos Aires, Argentina

Average sea temperature - Buenos Aires, Argentina

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 / Average sunshine
Buenos Aires, Argentina

Average daylight / Average sunshine - Buenos Aires, Argentina

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).

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
Buenos Aires, Argentina

Average sunshine days - Buenos Aires, Argentina

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
Buenos Aires, Argentina

Average UV index - Buenos Aires, Argentina

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 visibility
Buenos Aires, Argentina

Average visibility - Buenos Aires, Argentina

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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