Indonesia in September: where is it warmest?
In September, Surabaya is the warmest place with 33 °C by day, Denpasar the coolest with 27 °C. 10 of 16 destinations have good holiday weather.
All destinations in September, warmest first
Long-term averages for the month: daytime high, sea, sunshine and rainy days.
| Place | Score | Air | Sea | Sun | Rain days |
|---|---|---|---|---|---|
| Surabaya | 62 | 33° | 29° | 9 h | 4 |
| Jakarta | 48 | 31° | – | 6 h | 11 |
| Senggigi, Lombok | 99 | 30° | 28° | 9 h | 4 |
| Yogyakarta | 74 | 30° | – | 7 h | 6 |
| Makassar | 71 | 30° | 28° | 8 h | 7 |
| Nusantara | 69 | 30° | 29° | 6 h | 20 |
| Banda Aceh | 39 | 30° | 29° | 5 h | 19 |
| Medan | 35 | 30° | – | 4 h | 28 |
| Jayapura | 45 | 29° | 29° | 6 h | 25 |
| Komodo Island | 100 | 28° | 27° | 10 h | 2 |
| Labuan Bajo | 89 | 28° | 28° | 9 h | 5 |
| Ubud, Bali | 80 | 28° | – | 9 h | 9 |
| Bandung | 55 | 28° | – | 5 h | 17 |
| Batam | 51 | 28° | 29° | 5 h | 24 |
| Kuta, Bali | 91 | 27° | 26° | 9 h | 9 |
| Denpasar | 87 | 27° | 26° | 9 h | 9 |
Indonesia in September: quick answers
Indonesia in September: where is it warmest?
The warmest places in September are Surabaya (33 °C), Jakarta (31 °C) and Senggigi, Lombok (30 °C).
Indonesia in September: where is the sea warmest?
The sea is warmest at Surabaya (29 °C), Nusantara (29 °C) and Banda Aceh (29 °C).
Indonesia in September: where is the weather best?
The best holiday weather in September – warm, sunny and dry – is in Komodo Island, Senggigi, Lombok and Kuta, Bali.
Indonesia month by month
Indonesia: weather & best time to visit
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences