Weather in Cairns in July

Prime time. July is about as good as Cairns gets. Highs average 25.3 °C, lows 18.3 °C, and rain falls on 10 days — nothing in the month is working against you.

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

Rain on 10 days, 1 of them heavy. Enough to need a plan B, not enough to need a plan around it. 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 July reaches 30 °C. Across the twenty years measured, the hottest July day reached 30.2 °C and the coldest night fell to 10.7 °C, and the wettest single day dropped 32 mm — roughly 60% of the month's rain in one day.

July is moderately variable: 13 mm in the driest year against 159 mm in the wettest, around an average of 53 mm. Roughly two Julys in three land near that average, and the third does something else entirely.

Wind is light at 6.4 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 81%, high enough to notice on the warm days without dominating them.

How July sits in the year

Temperatures hold steady either side: 25.5 °C in June, 25.3 here, 26.6 in August. Nothing about the timing within the month matters much.

Daylight in July

July sits at the dark end of Cairns's year — 11.2 hours of daylight against 13.1 at midsummer, holding steady all month. Sightseeing days are genuinely shorter, and an itinerary built for summer will not fit.

Sea temperature

The sea sits at about 24.9 °C in July — 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

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.

July in Cairns versus nearby

If Cairns is one option among several, the nearby comparison is worth making. Port Douglas is close enough to be a coin toss — within a degree on temperature, 1 day less rain. Townsville is a better bet in July — within a degree on temperature, 7 days less rain.

So: July works, with August the better month by 7 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Cairns

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