Weather in Labuan Bajo in September

Shoulder season. September is shoulder season in Labuan Bajo — cheaper, quieter, and a genuine gamble. Highs average 31.9 °C, lows 24.4 °C, and rain falls on 8 days — nothing in the month is working against you.

September ranks 4 of 12 in Labuan Bajo: past the worst of the year but short of July, 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 31.9 °C days and 24.4 °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: 29 days top 30 °C, making the heat continuous rather than occasional. Across the twenty years measured, the hottest September day reached 34.4 °C and the coldest night fell to 21.9 °C, and the wettest single day dropped 47 mm — roughly 66% of the month's rain in one day.

This is the volatile part. September rainfall has ranged from 1 mm to 322 mm across the twenty years measured — a 321 mm spread around an average of 71 mm. The average is real but almost no individual September looks like it, so treat the figure as the middle of a wide range rather than a forecast.

Wind is light at 3.8 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 70%.

How September sits in the year

Temperatures hold steady either side: 30.5 °C in August, 31.9 here, 32.6 in October. Nothing about the timing within the month matters much. Rain is the thing that moves: October brings 7 days more of it, so the earlier half of a flexible trip is the safer half.

Daylight in September

Labuan Bajo sits close enough to the equator that daylight barely moves all year — 12 hours in September, against a range of just 1 hour across the whole calendar. Sunrise and sunset land at roughly the same time whenever you come.

Sea temperature

The sea sits at about 27.8 °C in September — warm enough that the water offers no relief from the heat. The sea peaks at 29.8 °C in April and bottoms out at 27.5 °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.

September in Labuan Bajo versus nearby

If Labuan Bajo is one option among several, the nearby comparison is worth making. Makassar is close enough to be a coin toss — within a degree on temperature, 4 days less rain. Denpasar is a better bet in September — within a degree on temperature, 3 days less rain.

So: September works, with July the better month by 16 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Labuan Bajo

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