Indonesia in september: average Weather, Temperature and Climate, Where to go?
Weather in Indonesia in september 2025
Below, you have access to the weather forecast for september for most popular cities in Indonesia. These datas are statistics for the month of september from weather reports for over 10 years. The percentage indicates the probability of having the weather mentioned.
Average weather in september in Java (Jakarta)
good weather UV index: 8
Weather at 6am
83°F
Clear/Sunny
61% of time
23%
13%
4%
Weather at 12pm
92°F
Clear/Sunny
58% of time
18%
18%
5%
Weather at 6pm
83°F
Clear/Sunny
35% of time
28%
24%
14%
Weather at 3am
79°F
53%
25%
19%
4%
More information about the weather in Java (Jakarta) in september
Where to go in Indonesia in september?
Where to go in Indonesia in september: destination map
Where to go in each region in september?
| Bali (Denpasar, Ubud, Amed...) | 83°F to 86°F | 2 à 4 days | 81°F to 83°F | good weather* |
| Borneo (Kalimantan) (Pontianak (Borneo), Samarinda, Palangkaraya...) | 86°F to 94°F | 6 à 19 days | 85°F to 86°F | good weather* |
| Indonesian Papua (Jayapura, Raja Ampat Islands, Merauke...) | 65°F to 88°F | 5 à 29 days | 85°F to 86°F | tolerable weather* |
| Java (Jakarta, Bandung, Surabaya...) | 81°F to 97°F | 1 à 12 days | 79°F to 85°F | good weather* |
| Lesser Sunda Islands (Sumba (Waingapu), Flores, Komodo island...) | 85°F to 88°F | 1 à 3 days | 83°F | perfect weather |
| Lombok (Mataram, Gili Air, Selong Blanak...) | 85°F | 3 days | 81°F to 83°F | perfect weather |
| Maluku Islands (Ambon, Banda Islands, Ternate...) | 81°F to 86°F | 1 à 16 days | 81°F to 85°F | good weather* |
| Sulawesi (Makassar, Manado, Kendari...) | 81°F to 92°F | 2 à 22 days | 83°F to 86°F | good weather* |
| Sumatra (Medan, Palembang, Padang City...) | 79°F to 95°F | 6 à 22 days | 83°F to 86°F | tolerable weather* |
| Sumbawa (Sumbawa Besar, Bima, Taliwang...) | 88°F to 92°F | 1 à 3 days | 83°F | good weather* |
| West Timor (Kupang, Atambua, Kefamenanu...) | 83°F to 85°F | 1 à 2 days | 83°F | perfect weather |
Where should you go in Indonesia in september when it comes to the weather?
Remember:
The climate in Indonesia in september ranges from perfect to tolerable depending on the region and city.
In September, humidity and heat determine climatic conditions throughout Indonesia. Due to the influence of the geographical situation, the climate throughout September in Indonesia can be pleasant as in the case of the southern islands, or just suitable as in the rest of the country. Either way, September is a good time to come and re-energize in Indonesia before the arrival of the monsoon season.
Sumatra and Northwestern Indonesia in September
With a slight decrease of precipitation, the northwestern part of the country is experiencing an improvement in climatic conditions. Thus, the sunny days are more numerous. However, as the heat is still high especially in the middle of the day, choose the right times for outings.
Borneo and Central Indonesia in September
The climatic conditions in Borneo remain identical to those of the previous month. Temperatures are warm and the rains that can occur at any time affect the quality of the weather in Indonesia throughout September. However, as the time span between rainy episodes is relatively long, one can still enjoy the beautiful sun.
The Small islands of Southern Indonesia in September
The whole of the southern islands will allow to benefit from superb climatic conditions, favorable to the outings in the open air and visiting the beach. Not only is the heat comfortable, but the withdrawal of the rains gives way to more sunny days.
Climate in Indonesia in september
Climate in Java (Jakarta) in september
In the month of september, maximum temperature is 92°F and minimum temperature is 83°F (for an average temperature of 86°F). The climate is very warm around this city in the month of september. With 5.2in over 7 days, rain may occur during your stay. But this is moderate and you will not be too bothered by it.
With a correct climate, the month of september is okay (but not good month) for traveling in this city in Indonesia.
| September | |||
| Average temperature | 86°F | ||
| Highest temperature | 92°F | ||
| Lowest temperature | 83°F | ||
| Sea temperature | 85°F | ||
| Rainfall | 5.2in | ||
| Number of days with rainfall | 7 day(s) (22%) | ||
| Humidity | 74% | ||
| Daily sunshine hours | 12 | ||
| Cloud cover | 26% | ||
| Length of day | 12:04 | ||
| Our opinion at whereandwhen.net | good |
Climate in Bali in september
In the month of september, maximum temperature is 83°F and minimum temperature is 79°F (for an average temperature of 81°F). The climate quite pleasant in this city in september. With 1.9in over 3 days, rainfall can happen during your vacations. But this is pretty reasonably and it will not be continuous.
With a good climate, september is an advisable month to go there in Indonesia.
| September | |||
| Average temperature | 81°F | ||
| Highest temperature | 83°F | ||
| Lowest temperature | 79°F | ||
| Sea temperature | 80°F | ||
| Rainfall | 1.9in | ||
| Number of days with rainfall | 3 day(s) (9%) | ||
| Humidity | 82% | ||
| Daily sunshine hours | 12 | ||
| Cloud cover | 35% | ||
| Length of day | 12:03 | ||
| Our opinion at whereandwhen.net | perfect |
Climate in Lombok in september
In the month of september, the mean temperature in Lombok is 81°F (maximum temperature is 85°F and minimum temperature is 79°F). The climate is very warm in that locality in this month. With about 2.8in over 3 days, rain may be scarce during your vacations.
With good weather conditions, september is a recommended month to go in this locality in Indonesia.
| September | |||
| Average temperature | 81°F | ||
| Highest temperature | 85°F | ||
| Lowest temperature | 79°F | ||
| Sea temperature | 81°F | ||
| Rainfall | 2.8in | ||
| Number of days with rainfall | 3 day(s) (11%) | ||
| Humidity | 80% | ||
| Daily sunshine hours | 12 | ||
| Cloud cover | 25% | ||
| Length of day | 12:03 | ||
| Our opinion at whereandwhen.net | perfect |
Climate in Sulawesi (Makassar) in september
In september, the mean temperature in Sulawesi (Makassar) is 86°F (maximum temperature is 92°F and minimum temperature is 83°F). The climate is very warm in that locality in september. With just 1.2in over 2 days,
it rains very little during your holidays.
With good weather conditions, the month of september is a good month to go in this locality.
| September | |||
| Average temperature | 86°F | ||
| Highest temperature | 92°F | ||
| Lowest temperature | 83°F | ||
| Rainfall | 1.2in | ||
| Number of days with rainfall | 2 day(s) (6%) | ||
| Humidity | 68% | ||
| Daily sunshine hours | 12 | ||
| Cloud cover | 17% | ||
| Length of day | 12:05 | ||
| Our opinion at whereandwhen.net | good |
Climate in Sumatra (Medan) in september
In the month of september, the mean temperature in Sumatra (Medan) is 85°F (maximum temperature is 94°F and minimum temperature is 77°F). The climate is very hot around this city in this month. With 9.4in over 16 days, you will experience some showers for your trip. But this is pretty reasonably and you will not be too bothered by it.
With a correct climate, the month of september is okay (but not the best month) for traveling in Sumatra (Medan) in Indonesia.
| September | |||
| Average temperature | 85°F | ||
| Highest temperature | 94°F | ||
| Lowest temperature | 77°F | ||
| Sea temperature | 86°F | ||
| Rainfall | 9.4in | ||
| Number of days with rainfall | 16 day(s) (54%) | ||
| Humidity | 87% | ||
| Daily sunshine hours | 11 | ||
| Cloud cover | 39% | ||
| Length of day | 12:08 | ||
| Our opinion at whereandwhen.net | tolerable |
All cities in Indonesia in september
| Java (Jakarta) in september | good weather |
| Bali in september | perfect weather |
| Lombok in september | perfect weather |
| Sulawesi (Makassar) in september | good weather |
| Sumatra (Medan) in september | tolerable weather |
| Flores in september | perfect weather |
| Kalimantan (Borneo) in september | tolerable weather |
| Komodo island in september | perfect weather |
| Moluques in september | good weather |
| Indonesian Papua in september | tolerable weather |
| Sumba (Waingapu) in september | perfect weather |
| Sumbawa in september | perfect weather |
| Timor in september | perfect weather |
| Rote Island in september | perfect weather |
Weather data for Indonesia in september:
Weather data for Indonesia in september is derived from an average of the weather forecast since 2009 in Indonesia. There is a margin of error and these forecasts are to be considered as general information only. The weather in Indonesia can vary slightly from year to year, but these predictions should limit surprises. So you can pack your bags and check when is the best time to go to Indonesia.