Weather in Santiago in May

Prime time. If you get to pick your dates, May is the one. Highs average 23.7 °C, lows 11.4 °C, and rain falls on 5 days — nothing in the month is working against you.

May ranks 4 of 12 in Santiago: past the worst of the year but short of September, which is the month to book if the dates are open.

Rain falls on only 5 days, so an itinerary with no wet-weather fallback is a reasonable risk. Nothing specialised needed — this is the month you pack for the trip rather than for the weather.

What the averages hide

The averages here are honest — no hidden extremes worth planning around. Across the twenty years measured, the hottest May day reached 35.7 °C and the coldest night fell to -0.2 °C, and the wettest single day dropped 72 mm — roughly 164% of the month's rain in one day.

This is the volatile part. May rainfall has ranged from 0 mm to 175 mm across the twenty years measured — a 175 mm spread around an average of 44 mm. The average is real but almost no individual May looks like it, so treat the figure as the middle of a wide range rather than a forecast.

Wind is light at 5.5 km/h, so the temperature on the page is close to the temperature on your skin, and the air is dry at 40% humidity, which makes the heat far more bearable than the same figure somewhere humid — and dehydrates you faster than you expect.

How May sits in the year

The month is on the way down: 4.3 °C cooler than April, with June dropping another 3.5 °C. The first week and the last are not the same trip.

Daylight in May

May sits at the dark end of Santiago's year — 10.4 hours of daylight against 14.3 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

With no coast nearby, the year swings a fair way — 26.3 °C between the warmest afternoons and the coldest nights, wider than any coastal city at this latitude would manage.

How busy it gets

Busy. Popular without being frantic; book the things you care about, improvise the rest.

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

May in Santiago versus nearby

If Santiago is one option among several, the nearby comparison is worth making. Córdoba is close enough to be a coin toss — within a degree on temperature, 1 day less rain. San Miguel de Tucumán is close enough to be a coin toss — within a degree on temperature, 1 day less rain.

So: May is effectively as good as it gets here — 4 points behind September, which is inside the margin where the weather stops being the deciding factor and price starts being it.

Every month in Santiago

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