Indonesia weather in September
In September, popular resorts in Indonesia (Surabaya, Semarang, Makassar, Batam, Jepara) average 29°C by day and 25°C at night, and the sea is about 28°C. On average 92 mm of rain falls during the month.
That is the same as in August, and in October days average 29°C.
It is hot: ideal beach and swimming weather. The sea is warm and pleasant for swimming.
Warmest resorts in Indonesia in September
| Place | Day | Night | Sea | Rain |
|---|---|---|---|---|
| Semarang | 34°C | 23°C | 30°C | 68 mm |
| Surabaya | 33°C | 25°C | 29°C | 18 mm |
| Kupang | 33°C | 22°C | 28°C | 7 mm |
| Pasuruan | 32°C | 25°C | 30°C | 14 mm |
| Makassar | 31°C | 25°C | 28°C | 26 mm |
| Situbondo | 31°C | 26°C | 29°C | 15 mm |
| Probolinggo | 31°C | 21°C | 26°C | 17 mm |
| Labuan Bajo | 31°C | 23°C | 27°C | 72 mm |
| Pekalongan | 31°C | 21°C | 29°C | 65 mm |
| Tegal | 31°C | 21°C | 29°C | 65 mm |
| Pemalang | 31°C | 21°C | 29°C | 65 mm |
| Cilegon | 30°C | 25°C | 29°C | 72 mm |
Indonesia weather in other months
See also
FAQ
Is it warm in Indonesia in September?
In September, popular resorts in Indonesia (Surabaya, Semarang, Makassar, Batam, Jepara) average 29°C by day and 25°C at night, and the sea is about 28°C. On average 92 mm of rain falls during the month. It is hot: ideal beach and swimming weather.
What is the sea temperature in Indonesia in September?
About 28°C on average. The warmest water is in Semarang (30°C).
Where is it warmest in Indonesia in September?
The warmest place is Semarang (34°C by day), followed by Surabaya (33°C) and Kupang (33°C).
Does it rain in Indonesia in September?
On average 92 mm of rain falls in the month. It is a fairly wet month, so pack a jacket.
Long-term averages from NASA POWER data (MERRA-2, 2001-2020 reanalysis, CC BY 4.0). Sea temperature is the average water surface temperature at the nearest grid point over the sea. This is climate, not a forecast for a specific day.