Swimming on the island of Sumatra in september 2025 Sea temperature by city in september
Do you want to go to the beach on the island of Sumatra in september 2025? Is it the right month to go for pleasant temperatures and staying in the water for a long time? The answer is on this page with the sea temperatures in september on the island of Sumatra by city and our opinion on the chances of enjoying pleasant sea conditions.
Sea temperature on the island of Sumatra in september 2025
Here, find the average sea temperature on the island of Sumatra in september in several coastal cities.
North in september
85°F
min: 83°F / max: 86°F
85°F
min: 83°F / max: 87°F
Calang
86°F
min: 83°F / max: 88°F
Langsa
85°F
min: 83°F / max: 88°F
Lhokseumawe
85°F
min: 83°F / max: 87°F
Sibolga
85°F
min: 83°F / max: 88°F
South in september
84°F
min: 81°F / max: 86°F
83°F
min: 78°F / max: 88°F
Way Kambas National Park
83°F
min: 78°F / max: 87°F
Way Kambas National Park
83°F
min: 81°F / max: 86°F
Central in september
86°F
min: 83°F / max: 87°F
85°F
min: 81°F / max: 88°F
Pulau Rupat
85°F
min: 84°F / max: 87°F
Pulau Siberut
85°F
min: 82°F / max: 88°F
Pariaman
85°F
min: 81°F / max: 88°F
Riau Islands in september
86°F
min: 84°F / max: 87°F
Tanjungpinang
85°F
min: 83°F / max: 87°F
Bangka-Belitung Islands in september
Pulau Belitung
84°F
min: 82°F / max: 86°F
Where should you go swimming on the island of Sumatra in the month of september?
Swimming on the island of Sumatra in september is ideal
In september on the island of Sumatra swimming conditions are generally the same everywhere.
In september in Banda Aceh, Bandar Lampung, Bengkulu, Dumai, Gunungsitoli (Pulau Nias), Padang City, Batam, Way Kambas National Park, Calang, Pulau Belitung, Pulau Rupat, Pulau Siberut, Way Kambas National Park, Langsa, Lhokseumawe, Pariaman, Sibolga, Sigli and Tanjungpinang, swimming conditions are perfect! With water reaching a maximum of 86°F and an average of 85°F, going in the water (and staying there!) feels great.
Where to go swimming on the island of Sumatra in september: the map of sea temperatures
ideal swimming 
pleasant swimming 
cool swimming 
cold swimming 
freezing swimmingWater temperature and seasonal norms in september
Banda Aceh
| September | |||
| Average sea temperature | 85°F | ||
| Minimum sea temperature | 83°F | ||
| Maximum sea temperature | 86°F | ||
| Average outside temperature | 83°F | ||
| Maximum outside temperature | 90°F | ||
| Minimum outside temperature | 77°F | ||
| Precipitation | 5.4in | ||
| Number of days of precipitation | 7 jour(s) (23%) | ||
| Cloud cover | 37% | ||
| Our opinion | ideal swimming |
More information on swimming in Banda Aceh in september
Bandar Lampung
| September | |||
| Average sea temperature | 84°F | ||
| Minimum sea temperature | 81°F | ||
| Maximum sea temperature | 86°F | ||
| Average outside temperature | 85°F | ||
| Maximum outside temperature | 90°F | ||
| Minimum outside temperature | 77°F | ||
| Precipitation | 5.5in | ||
| Number of days of precipitation | 8 jour(s) (27%) | ||
| Cloud cover | 35% | ||
| Our opinion | ideal swimming |
More information on swimming in Bandar Lampung in september
Bengkulu
| September | |||
| Average sea temperature | 83°F | ||
| Minimum sea temperature | 78°F | ||
| Maximum sea temperature | 88°F | ||
| Average outside temperature | 83°F | ||
| Maximum outside temperature | 86°F | ||
| Minimum outside temperature | 77°F | ||
| Precipitation | 8.5in | ||
| Number of days of precipitation | 12 jour(s) (41%) | ||
| Cloud cover | 37% | ||
| Our opinion | ideal swimming |
More information on swimming in Bengkulu in september
Dumai
| September | |||
| Average sea temperature | 86°F | ||
| Minimum sea temperature | 83°F | ||
| Maximum sea temperature | 87°F | ||
| Average outside temperature | 85°F | ||
| Maximum outside temperature | 92°F | ||
| Minimum outside temperature | 77°F | ||
| Precipitation | 8.8in | ||
| Number of days of precipitation | 16 jour(s) (52%) | ||
| Cloud cover | 43% | ||
| Our opinion | ideal swimming |
More information on swimming in Dumai in september
Gunungsitoli (Pulau Nias)
| September | |||
| Average sea temperature | 85°F | ||
| Minimum sea temperature | 83°F | ||
| Maximum sea temperature | 87°F | ||
| Average outside temperature | 83°F | ||
| Maximum outside temperature | 85°F | ||
| Minimum outside temperature | 81°F | ||
| Precipitation | 13.6in | ||
| Number of days of precipitation | 15 jour(s) (49%) | ||
| Cloud cover | 47% | ||
| Our opinion | ideal swimming |
More information on swimming in Gunungsitoli (Pulau Nias) in september
List of coastal cities on the island of Sumatra
| Banda Aceh in september | ideal swimming |
| Bandar Lampung in september | ideal swimming |
| Bengkulu in september | ideal swimming |
| Dumai in september | ideal swimming |
| Gunungsitoli (Pulau Nias) in september | ideal swimming |
| Padang City in september | ideal swimming |
| Batam in september | ideal swimming |
| Way Kambas National Park in september | ideal swimming |
| Calang in september | ideal swimming |
| Pulau Belitung in september | ideal swimming |
| Pulau Rupat in september | ideal swimming |
| Pulau Siberut in september | ideal swimming |
| Way Kambas National Park in september | ideal swimming |
| Langsa in september | ideal swimming |
| Lhokseumawe in september | ideal swimming |
| Pariaman in september | ideal swimming |
| Sibolga in september | ideal swimming |
| Sigli in september | ideal swimming |
| Tanjungpinang in september | ideal swimming |