Weather in Denpasar in September

A good month. September works. It is not the peak, but nothing about it fights you. Highs average 30.1 °C, lows 23.8 °C, and rain falls on 5 days — nothing in the month is working against you.

September ranks 3 of 12 in Denpasar. Only August scores clearly higher, and the difference is small enough to be settled by price rather than weather.

Rain falls on only 5 days, so an itinerary with no wet-weather fallback is a reasonable risk. Pack for 30.1 °C days and 23.8 °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: 15 days top 30 °C — hot spells arrive, but they break. Across the twenty years measured, the hottest September day reached 33 °C and the coldest night fell to 20.8 °C, and the wettest single day dropped 38 mm — roughly 100% of the month's rain in one day.

This is the volatile part. September rainfall has ranged from 0 mm to 224 mm across the twenty years measured — a 224 mm spread around an average of 38 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 5.6 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 80%, high enough to notice on the warm days without dominating them.

How September sits in the year

Temperatures hold steady either side: 28.7 °C in August, 30.1 here, 31.5 in October. Nothing about the timing within the month matters much.

Daylight in September

Denpasar 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 26.1 °C in September — warm enough to stay in as long as you like. The sea peaks at 29.2 °C in March and bottoms out at 25.7 °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

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 Denpasar versus nearby

If Denpasar is one option among several, the nearby comparison is worth making. Surabaya is the weaker option in September — 3.7 °C warmer, 1 day less rain. Labuan Bajo is the weaker option in September — within a degree on temperature, 3 days more rain.

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

Every month in Denpasar

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