Weather in Geraldton in December

Prime time. December is about as good as Geraldton gets. Highs average 23.6 °C, lows 20.2 °C, and rain falls on 2 days — nothing in the month is working against you.

December ranks 5 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 2 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 barely swings — 3.4 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest December day reached 33.7 °C and the coldest night fell to 16.3 °C.

December is dependably dry, and that reliability is the point: across the twenty years measured, the wettest December on record still only managed 33 mm, and the driest managed 0 mm. There is no meaningful variability to plan around, which makes this one of the few months anywhere that you can build a fixed outdoor itinerary against without a fallback. The wettest single day in twenty years of Decembers brought 14 mm. Rain simply is not the variable that decides this trip — heat, crowds and cost are.

Wind sits around 24.5 km/h — a steady breeze rather than a nuisance, and welcome on the warmer days, and humidity is unremarkable at 74%.

How December sits in the year

Temperatures hold steady either side: 22.1 °C in November, 23.6 here, 24.7 in January. Nothing about the timing within the month matters much.

Daylight in December

December is at or near the longest days of Geraldton's year: 14 hours of daylight, holding steady all month. Evenings are the real gain — dinner outdoors still happens in full light.

Sea temperature

The sea sits at about 21.5 °C in December — comfortable for a proper swim. 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

Peak season. Expect the highest prices of the year and to be booking well ahead. If the dates are flexible, September is the trade worth considering — 10 points weaker on weather, and materially quieter.

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

December in Geraldton versus nearby

If Geraldton is one option among several, the nearby comparison is worth making. Perth is close enough to be a coin toss — within a degree on temperature, 1 day more rain. Bunbury is close enough to be a coin toss — 4.8 °C warmer, 1 day more rain.

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

Every month in Geraldton

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