Weather in Brisbane in September

Prime time. If you get to pick your dates, September is the one. Highs average 24.2 °C, lows 15.6 °C, and rain falls on 7 days — nothing in the month is working against you.

September ranks 2 of 12 in Brisbane. Only August scores clearly higher, and the difference is small enough to be settled by price rather than weather.

Rain on 7 days, 1 of them heavy. Enough to need a plan B, not enough to need a plan around it. 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 September day reached 34.1 °C and the coldest night fell to 9 °C, and the wettest single day dropped 39 mm — roughly 103% of the month's rain in one day.

September is moderately variable: 4 mm in the driest year against 99 mm in the wettest, around an average of 38 mm. Roughly two Septembers in three land near that average, and the third does something else entirely.

Wind is light at 12.1 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 68%.

How September sits in the year

The month is on the way up: 2.5 °C warmer than August, and October adds another 1.9 °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 0.8 hours across the month. That is between Brisbane's extremes of 13.9 and 10.4 hours, so days are long enough not to constrain the plan.

An inland climate

Despite being inland, the year stays fairly even: 16.7 °C between the year's warmest afternoons and coldest nights.

How busy it gets

Peak season. Expect the highest prices of the year and to be booking well ahead. If the dates are flexible, May is the trade worth considering — 9 points weaker on weather, and materially quieter.

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

September in Brisbane versus nearby

If Brisbane is one option among several, the nearby comparison is worth making. Toowoomba is close enough to be a coin toss — within a degree on temperature, 2 days less rain. Byron Bay is close enough to be a coin toss — 2.7 °C cooler, the same number of rain days.

So: September is effectively as good as it gets here — 2 points behind August, which is inside the margin where the weather stops being the deciding factor and price starts being it.

Every month in Brisbane

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