Weather in Port Douglas in August

Prime time. August is about as good as Port Douglas gets. Highs average 25.5 °C, lows 20.6 °C, and rain falls on 6 days — nothing in the month is working against you.

August is the highest-scoring month of the twelve. The nearest rival is September, and the month at the other end of the year is February.

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 August reaches 30 °C; the day barely swings — 4.9 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest August day reached 32 °C and the coldest night fell to 15.8 °C, and the wettest single day dropped 33 mm — roughly 127% of the month's rain in one day.

This is the volatile part. August rainfall has ranged from 0 mm to 96 mm across the twenty years measured — a 96 mm spread around an average of 26 mm. The average is real but almost no individual August looks like it, so treat the figure as the middle of a wide range rather than a forecast.

Wind is light at 10.2 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 74%.

How August sits in the year

Temperatures hold steady either side: 24.7 °C in July, 25.5 here, 27 in September. Nothing about the timing within the month matters much.

Daylight in August

Port Douglas sits close enough to the equator that daylight barely moves all year — 11.5 hours in August, against a range of just 1.9 hours across the whole calendar. Sunrise and sunset land at roughly the same time whenever you come.

Sea temperature

The sea sits at about 24.7 °C in August — 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.

August in Port Douglas versus nearby

If Port Douglas is one option among several, the nearby comparison is worth making. Cairns is close enough to be a coin toss — within a degree on temperature, the same number of rain days. Townsville is close enough to be a coin toss — within a degree on temperature, 4 days less rain.

So: August is the answer for Port Douglas. If it is booked out or priced out, September is the next best thing at 1 points behind, and February is the month to keep off the shortlist.

Every month in Port Douglas

See all twelve months in Port Douglas, or where else to go in August.