An archipelago wide enough that the islands do not share a wet season — Bali and Sumatra do not run on the same calendar.
May and September give dry-season weather with fewer people than the middle of it. If diving is the point, follow the dry season of the specific island you are heading to — the eastern ones keep their own calendar.
Indonesia sits on the equator with two main seasons, dry and wet, but their timing differs island to island. Bali and Java are dry roughly May to September, which is when most visitors come, while the eastern islands and parts of Sumatra run to a different rhythm. Temperature barely moves across the year; what changes is rainfall and the state of the sea.
May and September give dry-season weather with fewer people than the middle of it. If diving is the point, follow the dry season of the specific island you are heading to — the eastern ones keep their own calendar.
New-year week prices run high against the wet season, and national holidays fill domestic flights. If your trip involves several connecting flights, avoid those weeks or book further ahead than usual.
Coverage is good in the cities and the main visitor areas of Bali and Java, and in the larger towns on other islands; on small and remote islands it can be limited to the village area. The wet season affects power and hotel Wi-Fi more than the mobile network. Download maps before every boat crossing.
Smartfren / Telkomsel / XL
La validesa comença amb la primera connexió a la destinació
Smartfren / Telkomsel / XL
5G
La validesa comença amb la primera connexió a la destinació
Smartfren / Telkomsel / XL
5G
La validesa comença amb la primera connexió a la destinació
Smartfren / Telkomsel / XL
5G
La validesa comença amb la primera connexió a la destinació
Smartfren / Telkomsel / XL
4G
La validesa comença amb la primera connexió a la destinació
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La validesa comença amb la primera connexió a la destinació
No — it mostly comes down hard for a spell in the afternoon or overnight, leaving the daytime usable. What is affected more is the fast boats between islands, which can be cancelled when the swell is up.
It works country-wide, since the plan is tied to Indonesia as a whole — but actual coverage depends on whether that island has masts at all, and some very small ones only have service in places.
It depends on the site. Visibility is usually best in that area's own dry season, which is not the same everywhere — follow the calendar of the dive destination rather than Bali's.
