Weather in San Miguel de Tucumán in September

Prime time. September is about as good as San Miguel de Tucumán gets. Highs average 29.3 °C, lows 12.9 °C, and rain falls on 2 days — nothing in the month is working against you.

September ranks 5 of 12 in San Miguel de Tucumán: past the worst of the year but short of July, which is the month to book if the dates are open.

Rain falls on only 2 days, so an itinerary with no wet-weather fallback is a reasonable risk. Pack for 29.3 °C days and 12.9 °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: 5 days clear 35 °C, so a serious heatwave is normal rather than notable; the day swings 16.3 °C from low to high, which means one bag has to cover both. Across the twenty years measured, the hottest September day reached 42.8 °C and the coldest night fell to 1.2 °C, and the wettest single day dropped 37 mm — roughly 264% of the month's rain in one day.

This is the volatile part. September rainfall has ranged from 0 mm to 56 mm across the twenty years measured — a 56 mm spread around an average of 14 mm. The average is real but almost no individual September looks like it, so treat the figure as the middle of a wide range rather than a forecast.

Wind is light at 9.9 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 41%.

How September sits in the year

The month is on the way up: 3.5 °C warmer than August, and October adds another 3.5 °C. Late in the month feels noticeably different from the start of it, which is worth knowing if the trip is short.

Daylight in September

11.9 hours of daylight, gaining 0.8 hours across the month. That is between San Miguel de Tucumán's extremes of 13.8 and 10.5 hours, so days are long enough not to constrain the plan.

An inland climate

With no coast nearby, the year swings a fair way — 26.5 °C between the warmest afternoons and the coldest nights, wider than any coastal city at this latitude would manage. Within September itself the daily swing is 16.3 °C, so mornings and afternoons need different clothes.

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.

September in San Miguel de Tucumán versus nearby

If San Miguel de Tucumán is one option among several, the nearby comparison is worth making. Salta is close enough to be a coin toss — within a degree on temperature, 1 day less rain. Córdoba is close enough to be a coin toss — 3.6 °C cooler, 2 days more rain.

So: September works, with July the better month by 12 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in San Miguel de Tucumán

See all twelve months in San Miguel de Tucumán, or where else to go in September.