Weather in Santiago in August

Prime time. If you get to pick your dates, August is the one. Highs average 21 °C, lows 8.1 °C, and rain falls on 5 days — nothing in the month is working against you.

August ranks 5 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 August day reached 35.8 °C and the coldest night fell to -2.3 °C, and the wettest single day dropped 49 mm — roughly 123% of the month's rain in one day.

This is the volatile part. August rainfall has ranged from 0 mm to 119 mm across the twenty years measured — a 119 mm spread around an average of 40 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 is light at 5.4 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 52%.

How August sits in the year

The month is on the way up: 1.6 °C warmer than July, and September adds another 2.3 °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 Santiago's extremes of 14.3 and 9.9 hours, so days are long enough not to constrain the plan.

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.

August 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 — 2.2 °C warmer, 4 days less rain. San Miguel de Tucumán is close enough to be a coin toss — 4.8 °C warmer, 4 days less rain.

So: August 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 August.