Weather in Kalgoorlie in September

Prime time. If you get to pick your dates, September is the one. Highs average 24 °C, lows 7.8 °C, and rain falls on 3 days — nothing in the month is working against you.

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

Rain falls on only 3 days, so an itinerary with no wet-weather fallback is a reasonable risk. Nothing specialised needed — this is the month you pack for the trip rather than for the weather.

What the averages hide

Averages flatten a month, and this one hides a few things: the day swings 16.2 °C from low to high, which means one bag has to cover both. Across the twenty years measured, the hottest September day reached 35.9 °C and the coldest night fell to 0 °C.

September is moderately variable: 0 mm in the driest year against 28 mm in the wettest, around an average of 13 mm. Roughly two Septembers in three land near that average, and the third does something else entirely.

Wind is light at 12.5 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 51%.

How September sits in the year

The month is on the way up: 3.7 °C warmer than August, and October adds another 4.8 °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 0.9 hours across the month. That is between Kalgoorlie's extremes of 14.1 and 10.2 hours, so days are long enough not to constrain the plan.

An inland climate

With no coast nearby, the year swings a fair way — 31.4 °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 16.2 °C, so mornings and afternoons need different clothes.

How busy it gets

Peak season. Expect the highest prices of the year and to be booking well ahead.

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

September in Kalgoorlie versus nearby

If Kalgoorlie is one option among several, the nearby comparison is worth making. Perth is the weaker option in September — 6 °C cooler, 8 days more rain. Albany is the weaker option in September — 7.3 °C cooler, 11 days more rain.

So: September is effectively as good as it gets here — 0 points behind May, which is inside the margin where the weather stops being the deciding factor and price starts being it.

Every month in Kalgoorlie

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