Weather in Melbourne in September

A good month. September is a solid month to be in Melbourne. Highs average 16 °C, lows 8.2 °C, and rain falls on 12 days — nothing in the month is working against you.

September ranks 9 of 12 in Melbourne: past the worst of the year but short of January, which is the month to book if the dates are open.

Rain on 12 days, 1 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 16 °C days and 8.2 °C nights; the spread matters more here than any single number.

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 25.6 °C and the coldest night fell to 3.2 °C, and the wettest single day dropped 25 mm — roughly 41% of the month's rain in one day.

September is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest September on record still delivered 104 mm against 26 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 61 mm average is a reasonable planning figure, not a promise.

Wind is light at 12.7 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 77%, high enough to notice on the warm days without dominating them.

How September sits in the year

The month is on the way up: 2.2 °C warmer than August, and October adds another 2.9 °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

11.8 hours of daylight, gaining 1.2 hours across the month. That is between Melbourne's extremes of 14.8 and 9.6 hours, so days are long enough not to constrain the plan.

An inland climate

Despite being inland, the year stays fairly even: 19.2 °C between the year's warmest afternoons and coldest nights.

How busy it gets

Quiet. Few other visitors, cheaper rooms, and a real chance some seasonal operators are shut.

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

September in Melbourne versus nearby

If Melbourne is one option among several, the nearby comparison is worth making. Ballarat is close enough to be a coin toss — within a degree on temperature, 1 day less rain. Bendigo is close enough to be a coin toss — within a degree on temperature, 3 days less rain.

So: September is a compromise. January is 20 points better and is what Melbourne is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in Melbourne

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