Weather in Geraldton in September

Prime time. September is about as good as Geraldton gets. Highs average 19.4 °C, lows 16.4 °C, and rain falls on 6 days — nothing in the month is working against you.

September ranks 8 of 12 in Geraldton: past the worst of the year but short of January, which is the month to book if the dates are open.

Rain falls on only 6 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: it never really gets hot: not one day in an average September reaches 30 °C; the day barely swings — 3 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest September day reached 27.8 °C and the coldest night fell to 11.8 °C, and the wettest single day dropped 37 mm — roughly 109% of the month's rain in one day.

September is moderately variable: 5 mm in the driest year against 79 mm in the wettest, around an average of 34 mm. Roughly two Septembers in three land near that average, and the third does something else entirely.

Wind sits around 20.7 km/h — a steady breeze rather than a nuisance, and welcome on the warmer days, and humidity is unremarkable at 71%.

How September sits in the year

Temperatures hold steady either side: 19.2 °C in August, 19.4 here, 20.4 in October. Nothing about the timing within the month matters much.

Daylight in September

11.9 hours of daylight, gaining 0.8 hours across the month. That is between Geraldton's extremes of 14 and 10.3 hours, so days are long enough not to constrain the plan.

Sea temperature

The sea sits at about 19.9 °C in September — swimmable, but it takes a moment to commit. The sea peaks at 23.7 °C in March and bottoms out at 19.9 °C — water lags the air by a month or two, which is why the best swimming often comes after the best weather.

How busy it gets

Shoulder. The value months — prices ease off and you get the place closer to itself. September is the value pick for Geraldton: it scores within 10 points of January without carrying January's prices.

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

September in Geraldton versus nearby

If Geraldton is one option among several, the nearby comparison is worth making. Perth is the weaker option in September — within a degree on temperature, 5 days more rain. Bunbury is the weaker option in September — within a degree on temperature, 8 days more rain.

So: September works, with January the better month by 10 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Geraldton

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