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Warmest sea in Indonesia in September

594 coastal locations in Indonesia ranked by their typical September sea temperature. Region-wide average in September: 28.4°C. The top of the list is where to find the warmest swimming this month.

Warmest in September

Idi

30.1°C September mean in Indonesia

Regional September average

28.4°C

across all 594 coastal locations in Indonesia

Vs annual mean

-0.5°C

below the year-round regional average

What the Indonesia sea feels like in September

This water temperature is comparable to that of a swimming pool, but it might be higher than most open water swimmers prefer for serious swimming. Make sure to drink plenty of water before and after swimming and don't wear a wetsuit to avoid overheating.

Indonesia monthly average 28.2°C to 29.5°C
J
F
M
A
M
J
J
A
S
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N
D
  • Warmest month April 29.5°C
  • Coldest month August 28.2°C
  • Annual mean 28.9°C
  • Months above 20°C 12 of 12

Where September fits in the year

September sits inside the regional pattern shown on the left. Pick a different month to see how the ranking shifts.

All twelve Indonesia month rankings:

Indonesia sea temperature map (live)

The map shows today's latest reading at every Indonesia location. The list below is based on the typical September mean, useful for trip planning weeks or months ahead.

Zoom in to see individual locations. Click a pin for water temperatures. View list →
°C -2 0 1 3 5 7 9 11 13 15 17 19 21 24 27 30 35

Top 50 warmest Indonesia locations in September

Sorted by the typical September mean built from a decade of daily readings at each location. Click any place for its 30-day chart, monthly profile, and full 10-year history.

# Location September mean
1 Idi Aceh 30.1°C
2 Teluk Langsa Aceh 30.1°C
3 Kwatisore Papua 30.1°C
4 Medan 30.0°C
5 Percut 30.0°C
6 Nabire Papua 30.0°C
7 Pulau-Pulau Moor Papua 30.0°C
8 Pelabuhan Kualatanjung Sumatera Utara 30.0°C
9 Pulau Jemur Riau 30.0°C
10 Tanjungtiram Sumatra Utara 30.0°C
11 Teluk Nibung 30.0°C
12 Tanjung Sinaboi Kepulauan Riau 30.0°C
13 Belawan 30.0°C
14 Muara Kassei Kalimantan Timur 30.0°C
15 Tanjung Birai East Kalimantan 30.0°C
16 Tanjung Medang Riau 30.0°C
17 Seroei Papua 29.9°C
18 Dumai 29.9°C
19 Donggala Sulawesi Tengah 29.9°C
20 Palu 29.9°C
21 Barus Sumatra Utara 29.9°C
22 Singkel Aceh 29.9°C
23 Tanjung Parit Riau 29.9°C
24 Sungai Paloh Kalimantan Barat 29.9°C
25 Sulawesi 29.9°C
Show 25 more ▸
26 Tapaktuan Aceh 29.9°C
27 Lancang 29.8°C
28 Lhokseumawe 29.8°C
29 Wassior Papua Barat 29.8°C
30 Yende Papua Barat 29.8°C
31 Paloh 29.8°C
32 Teluk Togian Sulawesi Tengah 29.8°C
33 Tobelombangi Sulawesi Tengah 29.8°C
34 Poso Sulawesi Tengah 29.8°C
35 Pulau-Pulau Ayu Papua Barat 29.8°C
36 Pulau Unaginim Papua Barat 29.8°C
37 Pulau Yef Doif Papua Barat 29.8°C
38 Tanjung Sorong Papua Barat 29.8°C
39 Gunungsitoli Sumatera Utara 29.8°C
40 Sibolga 29.8°C
41 Sigli Aceh 29.8°C
42 Korim Papua 29.8°C
43 Bokat 29.8°C
44 Bwool Sulawesi Tengah 29.8°C
45 Maninili Sulawesi Tengah 29.8°C
46 Pimpi 29.8°C
47 Sarmi Papua 29.8°C
48 Malu Kepulauan Riau 29.7°C
49 Bosnik Papua 29.7°C
50 Mios Wundi Papua 29.7°C

Coldest 10 in Indonesia in September

Same data the other way. Helpful if you want to know which Indonesia coasts to avoid for swimming in September.

# Location September mean
1 Taman 17.9°C
2 Lantera 18.3°C
3 Tembol 18.3°C
4 Batawa 20.3°C
5 Karara 20.6°C
6 Pandan 22.1°C
7 Fontein 24.6°C
8 Bator 24.7°C
9 Prigi Jawa Timur 25.4°C
10 Tjilauteurem Jawa Barat 25.5°C

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