Weather in Darwin in September

A good month. September is a solid month to be in Darwin. Highs average 32.4 °C, lows 25.6 °C, and rain falls on 4 days — nothing in the month is working against you.

September ranks 5 of 12 in Darwin: 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 4 days, so an itinerary with no wet-weather fallback is a reasonable risk. Pack for 32.4 °C days and 25.6 °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: 29 days top 30 °C, making the heat continuous rather than occasional. Across the twenty years measured, the hottest September day reached 35.5 °C and the coldest night fell to 18.5 °C.

This is the volatile part. September rainfall has ranged from 1 mm to 62 mm across the twenty years measured — a 61 mm spread around an average of 17 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 10.9 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 60%.

How September sits in the year

Temperatures hold steady either side: 30.8 °C in August, 32.4 here, 33.1 in October. Nothing about the timing within the month matters much. Rain is the thing that moves: October brings 9 days more of it, so the earlier half of a flexible trip is the safer half.

Daylight in September

Darwin sits close enough to the equator that daylight barely moves all year — 12 hours in September, against a range of just 1.4 hours across the whole calendar. Sunrise and sunset land at roughly the same time whenever you come.

An inland climate

Despite being inland, the year stays fairly even: 11.7 °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.

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

September in Darwin versus nearby

If Darwin is one option among several, the nearby comparison is worth making. Broome is the weaker option in September — 3.7 °C warmer, 4 days less rain. Labuan Bajo is close enough to be a coin toss — within a degree on temperature, 4 days more rain.

So: September works, with July the better month by 18 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Darwin

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