Weather in Mar del Plata in April

A good month. April is a solid month to be in Mar del Plata. Highs average 18.8 °C, lows 12.9 °C, and rain falls on 10 days — nothing in the month is working against you.

April ranks 3 of 12 in Mar del Plata. Only November scores clearly higher, and the difference is small enough to be settled by price rather than weather.

Rain on 10 days, 3 of them heavy. Enough to need a plan B, not enough to need a plan around it. Nothing specialised needed — this is the month you pack for the trip rather than for the weather.

What the averages hide

Averages flatten a month, and this one hides a few things: it never really gets hot: not one day in an average April reaches 30 °C; the day barely swings — 6 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest April day reached 27.7 °C and the coldest night fell to 7 °C, and the wettest single day dropped 94 mm — roughly 90% of the month's rain in one day.

April is moderately variable: 25 mm in the driest year against 201 mm in the wettest, around an average of 105 mm. Roughly two Aprils in three land near that average, and the third does something else entirely.

Wind sits around 16.5 km/h — a steady breeze rather than a nuisance, and welcome on the warmer days, and humidity runs at 78%, high enough to notice on the warm days without dominating them.

How April sits in the year

The month is on the way down: 3.3 °C cooler than March, with May dropping another 3.5 °C. The first week and the last are not the same trip.

Daylight in April

11.1 hours of daylight, losing 1.1 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 16.8 °C in April — cold — a quick dip rather than a swim, and a wetsuit if you are in for longer. 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

Peak season. Expect the highest prices of the year and to be booking well ahead. If the dates are flexible, May is the trade worth considering — 9 points weaker on weather, and materially quieter.

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

April in Mar del Plata versus nearby

If Mar del Plata is one option among several, the nearby comparison is worth making. Buenos Aires is close enough to be a coin toss — 2.3 °C warmer, 2 days less rain. Rosario is close enough to be a coin toss — 5.3 °C warmer, 1 day less rain.

So: April is effectively as good as it gets here — 1 points behind November, which is inside the margin where the weather stops being the deciding factor and price starts being it.

Every month in Mar del Plata

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