Weather in Mar del Plata in August

Shoulder season. August sits in between. You will get good days and you will lose some. Highs sit at 12.2 °C and the day is short; this is an indoors-with-excursions month, not an outdoors-all-day one.

August ranks 11 of 12 — near the bottom of Mar del Plata's year. November is the month that works, and the swing between the two is 24 points, which is a different holiday rather than a slightly better one.

Rain on 9 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 12.2 °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 — 5.6 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest August day reached 21.9 °C and the coldest night fell to 0.9 °C, and the wettest single day dropped 80 mm — roughly 103% of the month's rain in one day.

August is moderately variable: 14 mm in the driest year against 226 mm in the wettest, around an average of 78 mm. Roughly two Augusts in three land near that average, and the third does something else entirely.

Wind sits around 16.4 km/h — a steady breeze rather than a nuisance, and welcome on the warmer days, and humidity runs at 84%, which at 12.2 °C means damp rather than muggy — the kind of cold that gets into a coat and stays there.

How August sits in the year

Temperatures hold steady either side: 11.1 °C in July, 12.2 here, 13.5 in September. Nothing about the timing within the month matters much.

Daylight in August

10.6 hours of daylight, gaining 1 hours across the month. That is between Mar del Plata's extremes of 14.8 and 9.5 hours, so days are long enough not to constrain the plan.

Sea temperature

The sea sits at about 9.7 °C in August — too cold to swim without a wetsuit. The sea peaks at 19.9 °C in February and bottoms out at 9.7 °C — water lags the air by a month or two, which is why the best swimming often comes after the best weather.

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 Mar del Plata versus nearby

If Mar del Plata is one option among several, the nearby comparison is worth making. Buenos Aires is a better bet in August — 2.8 °C warmer, 2 days less rain. Rosario is a better bet in August — 6.8 °C warmer, 5 days less rain.

So: August is a compromise. November is 19 points better and is what Mar del Plata is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in Mar del Plata

See all twelve months in Mar del Plata, or where else to go in August.