Weather in Nadi in September

A good month. September works. It is not the peak, but nothing about it fights you. Highs average 27.6 °C, lows 22.9 °C, and rain falls on 13 days — nothing in the month is working against you.

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

Rain on 13 days, 3 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: the day barely swings — 4.7 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest September day reached 31.2 °C and the coldest night fell to 19.3 °C, and the wettest single day dropped 79 mm — roughly 79% of the month's rain in one day.

September is moderately variable: 8 mm in the driest year against 261 mm in the wettest, around an average of 100 mm. Roughly two Septembers in three land near that average, and the third does something else entirely.

Wind sits around 17.3 km/h — a steady breeze rather than a nuisance, and welcome on the warmer days, and humidity runs at 77%, high enough to notice on the warm days without dominating them.

How September sits in the year

Temperatures hold steady either side: 26.7 °C in August, 27.6 here, 28.3 in October. Nothing about the timing within the month matters much.

Daylight in September

12 hours of daylight, gaining 0.5 hours across the month. That is between Nadi's extremes of 13.2 and 11.1 hours, so days are long enough not to constrain the plan.

Sea temperature

The sea sits at about 25.9 °C in September — warm enough to stay in as long as you like. The sea peaks at 29.1 °C in February and bottoms out at 25.9 °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.

September in Nadi versus nearby

If Nadi is one option among several, the nearby comparison is worth making. Labasa is close enough to be a coin toss — within a degree on temperature, 1 day more rain. Port-Vila is a better bet in September — 2.4 °C cooler, 2 days less rain.

So: September works, with July the better month by 8 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Nadi

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