Weather in Buenos Aires - 7-day forecast, rain, wind

Weather in Buenos Aires today and 7-day forecast

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Climate in Buenos Aires

Buenos Aires has a humid subtropical climate, with hot, humid summers from December to March (average highs of 30 degrees Celsius) and mild winters from June to August (average lows of 8 degrees). Remember that the seasons are reversed compared to the northern hemisphere.

Annual rainfall is around 1,200 mm, spread across the year but peaking in summer. Convective thunderstorms, sometimes with hail, are frequent and can be intense. The Rio de la Plata channels breezes that soften afternoons.

The sudestada, a persistent south-easterly wind, can cause river surges and flooding in low-lying parts of the city. The pampero, a southerly wind, brings cold, dry air after fronts.

Best time to visit is the austral spring (October-November) and autumn (March-May). Use the hourly forecast, storm alerts and Rio de la Plata level before planning La Boca, San Telmo or Puerto Madero.

The climate of Buenos Aires, with thirty years of data

Buenos Aires is in the southern hemisphere, so its summer falls in January and its winter in July: worth bearing in mind when reading the monthly table. The Río de la Plata and the Pampas plain give it a humid climate with no barriers, exposed both to warm air from the north and to cold incursions from the south — the pamperos, which cut heatwaves short with violent storms.

The year at a glance

The warmest month is January, with a mean maximum of 28.1 °C, and the coldest July, with minima averaging 7.9 °C. Being in the southern hemisphere, its warmest month falls in the middle of the European winter. About 997 mm fall a year, spread over 92 days of appreciable rain, peaking in March and at its lowest in June. There are 0 days of frost a year and 20 with the maximum above 30 °C.

Month by month

Monthly means over 30 years at Buenos Aires. ERA5-Land reanalysis, 1995 to 2024.
Monthly mean	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Maximum (°C)	28.1	26.8	24.7	21.2	17.2	14.5	13.8	15.8	17.6	20.6	24.0	26.7
Minimum (°C)	20.8	20.0	18.4	15.0	11.6	8.8	7.9	9.1	10.8	13.7	16.5	18.9
Rain (mm)	82	104	108	95	66	53	67	68	73	104	95	84
Rain days	7.3	8.6	8.3	8.2	6.4	6.5	7.0	6.5	7.3	9.5	8.2	7.9

The extremes of the series

Across these 30 years the highest temperature was 38.3 °C, on 14 January 2022, and the lowest -0.7 °C, on 11 July 2007. These are reanalysis values, not those of an observatory: they are useful for placing the magnitude, not as an official record.

Where these numbers come from

From ERA5-Land, the reanalysis produced by the European Centre for Medium-Range Weather Forecasts, downloaded from the Copernicus Climate Data Store under a CC-BY licence: hourly temperature and precipitation between 1995-01-01 and 2024-12-06, 30 complete years, in the -34.60°, -58.40° cell. It is a grid of about 9 km covering land only.

The Spanish cities on this site use AEMET’s official normals; there is no single equivalent for ten different countries, so the same global series is used for all of them. That has an advantage: the figures are comparable with one another, computed by the same method over the same period. And a limitation: a reanalysis cannot see the urban heat island, so in the centre of a large city the real minima are usually somewhat higher than those in the table.