Best Time to Visit Argentina: It Depends Which Argentina

Argentina runs 3,700 kilometres from the subtropical north to the edge of Antarctica. Asking for the best month to visit is like asking for the best month to visit Europe: the honest answer is that it depends entirely on which part.

If you want one answer anyway: October to November, or March to April. Those are the two windows where the whole country is workable at once, which matters if you are combining Buenos Aires with Patagonia and the falls.

The four Argentinas, and when each one works

Patagonia: November to March

Southern Patagonia is short-season country. In El Calafate the average high is 19 °C in January and 5 °C in July, when the average low is −4.4 °C. Rain is not the problem there, 161 mm in a whole year; the cold is. Argentina’s national parks service treats May to September as winter in Los Glaciares: trekking poles and crampons are mandatory on the trails, and chains or studded tyres on the park roads. December to February is the reliable core.

The Perito Moreno glacier is the exception. Its access road keeps published visiting hours in both seasons, 8:00 to 18:00 from September to April and 9:00 to 16:00 from May to August, so you can see it in any month. For the Chilean side as well, Torres del Paine and the penguin and whale seasons, see our month by month guide to the best time to visit Patagonia.

Best time to visit Iguazu Falls: any month, for different reasons

Iguazu is warm and wet all year, and what changes between months is comfort, not access. The average high at Iguazu airport is 32 °C in January and 22.5 °C in July, and no month is dry: October is the wettest, with 247 mm.

You will often read that the falls carry the most water in a particular season. The river does not keep to that. Brazil’s national water agency describes the Iguaçu as having little seasonality, partly because dams upstream regulate it, and its big floods arrive as events, not as a calendar. The last two show why it pays to check before you travel: the river destroyed the Devil’s Throat walkway in October 2023, and it reopened on 13 July 2024; from 3 August 2026 the park closed it again for around forty days as a flood precaution.

Best time to visit Buenos Aires: spring and autumn

October and November, or March and April. The average high in Buenos Aires is 30 °C in January, with 134 mm of rain, and 15.5 °C in July, when the nights drop to 7.5 °C. In April and October the average high is around 23 °C, which is walking weather for a city that is best seen on foot.

The northwest, Salta and Jujuy: April to June

The northwest has a wet summer and a dry winter, and the difference is extreme. Salta receives 197 mm of rain in January and 2.7 mm in July. By April the rain has mostly stopped, 42 mm for the month, the Quebrada de Humahuaca has colour and the mountain roads are dry. Winter nights are cold: the July average low in Salta is 2.9 °C.

Argentina weather by month, region by region

Four months tell you most of the year. These are the averages from the national weather service’s 1991–2020 climate normals.

Average high / low, °C

Place	Jan	Apr	Jul	Oct
Buenos Aires	30 / 20	23 / 14	16 / 8	23 / 13
Iguazu	32 / 21	28 / 17	23 / 11	29 / 17
Salta	28 / 17	23 / 12	20 / 3	27 / 12
Mendoza	33 / 19	23 / 11	15 / 2	26 / 12
Bariloche	23 / 7	15 / 2	7 / −2	15 / 2
El Calafate	19 / 7	13 / 1	5 / −4	14 / 1
Ushuaia	14 / –	9 / –	5 / –	10 / –

Rainfall, mm in the month

Place	Jan	Apr	Jul	Oct
Buenos Aires	134	130	74	123
Iguazu	180	161	107	247
Salta	197	42	3	24
Mendoza	47	19	5	11
Bariloche	24	57	126	49
El Calafate	7	20	14	14
Ushuaia	45	47	36	28

El Calafate’s averages cover 2001–2020 and Ushuaia’s 1997–2020, the years those stations have records for. The weather service publishes no average low for Ushuaia.

Two things the table shows that a month-by-month list hides. Bariloche is the odd one out: its rain falls in winter, with June the wettest month at 168 mm, just before the ski season opens. And Mendoza is dry country, 238 mm in a whole year, so the wine region stays dry whenever you go.

Argentina seasons: what each one is for

Argentina seasons run opposite to the northern hemisphere’s, and each one has something the others do not.

• Summer, December to February. Patagonia’s core season, and the long school holiday: Argentine classes end in the second half of December and restart at the end of February.
• Autumn, March to May. Buenos Aires and Mendoza at their most comfortable. The grape-harvest festival, the Fiesta Nacional de la Vendimia, holds its main night in Mendoza on the first Saturday of March: 6 March in 2027.
• Winter, June to August. The most comfortable walking weather at Iguazu, and ski season: Cerro Catedral, above Bariloche, opens in July and closes at the end of September, snow permitting. The winter school break also falls in July, staggered by province: in 2026 it ran from 6 to 31 July.
• Spring, September to November. Wildlife on the Atlantic coast. Southern right whales visit Península Valdés from June to December, and the Magellanic penguin colony at Punta Tombo is open from September to April, so October and November give you both.

The conflict, and how we usually resolve it

Look at the four regions together and the problem is obvious. Patagonia peaks in January. Buenos Aires and the northwest are at their worst in January: 30 °C in the city, and the month of the heaviest rain in Salta.

There is no month that is perfect everywhere, so the planning question becomes which region gets to decide the dates.

In practice:

• Patagonia is the anchor. It has the narrowest window and the least forgiving weather, so if it is on the list, it sets the month and everything else adapts.
• Without Patagonia, October and November or March and April win comfortably.
• Iguazu adapts to anything, so it never needs to drive the decision.

What the seasons cost you

Two practical points that rarely appear in month-by-month guides.

January and February are the Argentine summer holidays. Schools are out from late December to the end of February, and Patagonia’s short season falls in exactly those weeks. Book southern lodges and flights early for those months.

Domestic flights are the real constraint in Patagonia. The distances are enormous and the routes are seasonal. The month you choose changes which internal flights even exist, and that is usually a bigger factor in the shape of an itinerary than the temperature is. Our Argentina itinerary guide lays out which of those flights exist and what fits in 7, 10, 14 or 21 days.