Weather in Buenos Aires in May

A good month. May works. It is not the peak, but nothing about it fights you. Highs average 17.2 °C, lows 13 °C, and rain falls on 7 days — nothing in the month is working against you.

Buenos Aires barely has seasons. May scores 77 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.

Rain on 7 days, 2 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 17.2 °C days and 13 °C nights; the spread matters more here than any single number.

What the averages hide

Averages flatten a month, and this one hides a few things: the day barely swings — 4.3 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest May day reached 24.7 °C and the coldest night fell to 5.2 °C, and the wettest single day dropped 58 mm — roughly 78% of the month's rain in one day.

May is moderately variable: 8 mm in the driest year against 193 mm in the wettest, around an average of 74 mm. Roughly two Mays 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 80%, high enough to notice on the warm days without dominating them.

How May sits in the year

The month is on the way down: 3.9 °C cooler than April, with June dropping another 2.8 °C. The first week and the last are not the same trip.

Daylight in May

May sits at the dark end of Buenos Aires's year — 10.3 hours of daylight against 14.5 at midsummer, losing 0.7 hours across the month. Sightseeing days are genuinely shorter, and an itinerary built for summer will not fit.

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

Shoulder. The value months — prices ease off and you get the place closer to itself. May is the value pick for Buenos Aires: it scores within 6 points of April without carrying April's prices.

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

May 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 May — 2.5 °C warmer, 1 day less rain. Mar del Plata is the weaker option in May — within a degree on temperature, 2 days more rain.

So: May is effectively as good as it gets here — 6 points behind April, which is inside the margin where the weather stops being the deciding factor and price starts being it.

Every month in Buenos Aires

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