Weather in Bunbury in January

A good month. January is a solid month to be in Bunbury. Highs average 31 °C, lows 16.3 °C, and rain falls on 2 days — nothing in the month is working against you.

January ranks 7 of 12 in Bunbury: past the worst of the year but short of November, 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. Pack for 31 °C days and 16.3 °C nights; the spread matters more here than any single number.

What the averages hide

Averages flatten a month, and this one hides a few things: 5 days clear 35 °C, so a serious heatwave is normal rather than notable. Across the twenty years measured, the hottest January day reached 40.4 °C and the coldest night fell to 9 °C, and the wettest single day dropped 56 mm — roughly 350% of the month's rain in one day.

This is the volatile part. January rainfall has ranged from 1 mm to 81 mm across the twenty years measured — a 80 mm spread around an average of 16 mm. The average is real but almost no individual January looks like it, so treat the figure as the middle of a wide range rather than a forecast.

Wind is light at 15.6 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 54%.

How January sits in the year

Temperatures hold steady either side: 28.4 °C in December, 31 here, 31 in February. Nothing about the timing within the month matters much.

Daylight in January

January is at or near the longest days of Bunbury's year: 14.1 hours of daylight, losing 0.5 hours across the month. Evenings are the real gain — dinner outdoors still happens in full light.

Sea temperature

The sea sits at about 21.5 °C in January — comfortable for a proper swim. The sea peaks at 22.7 °C in March and bottoms out at 18.7 °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

Busy. Popular without being frantic; book the things you care about, improvise the rest.

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

January in Bunbury versus nearby

If Bunbury is one option among several, the nearby comparison is worth making. Perth is a better bet in January — 4.6 °C cooler, the same number of rain days. Albany is a better bet in January — 8.8 °C cooler, 3 days more rain.

So: January works, with November the better month by 12 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Bunbury

See all twelve months in Bunbury, or where else to go in January.