Weather in Buenos Aires in August

A good month. August works. It is not the peak, but nothing about it fights you. Highs sit at 15 °C and the day is short; this is an indoors-with-excursions month, not an outdoors-all-day one.

Buenos Aires barely has seasons. August scores 70 out of 100 against a best of 83 in April — a gap small enough that the month you choose matters far less here than the week you choose. Worth keeping in perspective: August is the weakest month of Buenos Aires's year and it is still a perfectly good one. The downside here is small.

Rain on 7 days, 2 of them heavy. Enough to need a plan B, not enough to need a plan around it. Layers, and a genuinely waterproof outer — at 15 °C the difference between a good day and a miserable one is entirely down to what you are wearing.

What the averages hide

Averages flatten a month, and this one hides a few things: the day barely swings — 5.2 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest August day reached 26 °C and the coldest night fell to 3.4 °C, and the wettest single day dropped 72 mm — roughly 101% of the month's rain in one day.

This is the volatile part. August rainfall has ranged from 10 mm to 201 mm across the twenty years measured — a 191 mm spread around an average of 71 mm. The average is real but almost no individual August looks like it, so treat the figure as the middle of a wide range rather than a forecast.

Wind sits around 16.8 km/h — a steady breeze rather than a nuisance, and welcome on the warmer days, and humidity runs at 80%, high enough to notice on the warm days without dominating them.

How August sits in the year

The month is on the way up: 1.8 °C warmer than July, and September adds another 1.9 °C. Late in the month feels noticeably different from the start of it, which is worth knowing if the trip is short.

Daylight in August

10.8 hours of daylight, gaining 0.9 hours across the month. That is between Buenos Aires's extremes of 14.5 and 9.8 hours, so days are long enough not to constrain the plan.

An inland climate

Despite being inland, the year stays fairly even: 18.9 °C between the year's warmest afternoons and coldest nights.

How busy it gets

Off season. The genuine off season: cheapest by a distance, with the caveat that some tours and restaurants close entirely.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

August in Buenos Aires versus nearby

If Buenos Aires is one option among several, the nearby comparison is worth making. Rosario is a better bet in August — 4 °C warmer, 3 days less rain. Mar del Plata is the weaker option in August — 2.8 °C cooler, 2 days more rain.

So: August works, with April the better month by 13 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Buenos Aires

See all twelve months in Buenos Aires, or where else to go in August.