Weather in Avarua in September

A good month. September is a solid month to be in Avarua. Highs average 23.8 °C, lows 22.9 °C, and rain falls on 14 days — nothing in the month is working against you.

September ranks 4 of 12 in Avarua: past the worst of the year but short of June, which is the month to book if the dates are open.

This is persistent light rain rather than storms: 14 wet days but only 2 heavy ones. It rarely cancels anything outright, and it rarely fully clears either. A jacket beats an umbrella. 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 September reaches 30 °C; the day barely swings — 0.9 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest September day reached 26.8 °C and the coldest night fell to 19.7 °C, and the wettest single day dropped 41 mm — roughly 49% of the month's rain in one day.

September is moderately variable: 23 mm in the driest year against 188 mm in the wettest, around an average of 83 mm. Roughly two Septembers in three land near that average, and the third does something else entirely.

Wind sits around 21 km/h — a steady breeze rather than a nuisance, and welcome on the warmer days, and humidity runs at 79%, high enough to notice on the warm days without dominating them.

How September sits in the year

Temperatures hold steady either side: 23.5 °C in August, 23.8 here, 24.2 in October. Nothing about the timing within the month matters much.

Daylight in September

11.9 hours of daylight, gaining 0.6 hours across the month. That is between Avarua's extremes of 13.4 and 10.8 hours, so days are long enough not to constrain the plan.

Sea temperature

The sea sits at about 25 °C in September — warm enough to stay in as long as you like. The sea peaks at 28.1 °C in March and bottoms out at 24.8 °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. September is the value pick for Avarua: it scores within 6 points of June without carrying June's prices.

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

September in Avarua versus nearby

If Avarua is one option among several, the nearby comparison is worth making. Vaitape is a better bet in September — 2.6 °C warmer, 5 days less rain. Faaa is a better bet in September — 2.2 °C warmer, 4 days less rain.

So: September is effectively as good as it gets here — 6 points behind June, which is inside the margin where the weather stops being the deciding factor and price starts being it.

Every month in Avarua

See all twelve months in Avarua, or where else to go in September.