Weather in Cairns in October

A good month. October is a solid month to be in Cairns. Highs average 31.1 °C, lows 22 °C, and rain falls on 8 days — nothing in the month is working against you.

October ranks 6 of 12 in Cairns: past the worst of the year but short of August, which is the month to book if the dates are open.

Rain on 8 days, 2 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 31.1 °C days and 22 °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: 20 days top 30 °C, making the heat continuous rather than occasional. Across the twenty years measured, the hottest October day reached 39.2 °C and the coldest night fell to 17.9 °C, and the wettest single day dropped 100 mm — roughly 161% of the month's rain in one day.

This is the volatile part. October rainfall has ranged from 1 mm to 267 mm across the twenty years measured — a 266 mm spread around an average of 62 mm. The average is real but almost no individual October looks like it, so treat the figure as the middle of a wide range rather than a forecast.

Wind is light at 6.6 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 73%.

How October sits in the year

Temperatures hold steady either side: 29 °C in September, 31.1 here, 32.1 in November. Nothing about the timing within the month matters much.

Daylight in October

October is at or near the longest days of Cairns's year: 12.5 hours of daylight, gaining 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 26 °C in October — warm enough to stay in as long as you like. The sea peaks at 29.2 °C in February and bottoms out at 24.7 °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

Shoulder. The value months — prices ease off and you get the place closer to itself.

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

October in Cairns versus nearby

If Cairns is one option among several, the nearby comparison is worth making. Port Douglas is a better bet in October — 2.7 °C cooler, the same number of rain days. Townsville is close enough to be a coin toss — within a degree on temperature, 3 days less rain.

So: October is a compromise. August is 24 points better and is what Cairns 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 Cairns

See all twelve months in Cairns, or where else to go in October.