Weather in Alice Springs in September

Prime time. If you get to pick your dates, September is the one. Highs average 30 °C, lows 12.9 °C, and rain falls on 1 days — nothing in the month is working against you.

September ranks 5 of 12 in Alice Springs: past the worst of the year but short of August, which is the month to book if the dates are open.

Rain falls on only 1 days, so an itinerary with no wet-weather fallback is a reasonable risk. Pack for 30 °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: 17 days top 30 °C — hot spells arrive, but they break; the day swings 17.1 °C from low to high, which means one bag has to cover both. Across the twenty years measured, the hottest September day reached 38.9 °C and the coldest night fell to 3.1 °C.

This is the volatile part. September rainfall has ranged from 0 mm to 77 mm across the twenty years measured — a 77 mm spread around an average of 8 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 12 km/h, so the temperature on the page is close to the temperature on your skin, and the air is dry at 29% humidity, which makes the heat far more bearable than the same figure somewhere humid — and dehydrates you faster than you expect.

How September sits in the year

The month is on the way up: 5.4 °C warmer than August, and October adds another 3.9 °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 0.7 hours across the month. That is between Alice Springs's extremes of 13.6 and 10.7 hours, so days are long enough not to constrain the plan.

An inland climate

With no coast nearby, the year swings a fair way — 31.7 °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 17.1 °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 Alice Springs versus nearby

If Alice Springs is one option among several, the nearby comparison is worth making. Mount Isa is the weaker option in September — 3.1 °C warmer, the same number of rain days. Whyalla is close enough to be a coin toss — 8.8 °C cooler, 4 days more rain.

So: September works, with August the better month by 13 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Alice Springs

See all twelve months in Alice Springs, or where else to go in September.