Sumatra in september: average Weather, Temperature and Climate, Where to go?
Weather on the island of Sumatra in september 2025
Below, you have access to the weather forecast for the month of september for most popular cities in Sumatra. These predictions are statistics for the month of september from weather reports for many years. The percentage indicates the possibility of having the weather indicated.
Average weather in september in Medan
tolerable weather UV index: 7
Weather at 6am
77°F
Moderate rain at times
45% of time
29%
17%
7%
Weather at 12pm
94°F
Partly Cloudy
36% of time
35%
25%
5%
Weather at 6pm
81°F
Moderate rain at times
39% of time
33%
15%
11%
Weather at 3am
76°F
48%
25%
16%
7%
Where to go on the island of Sumatra in september?
Where to go on the island of Sumatra in september: destination map
perfect weather
good
tolerable
bad
very bad
Where to go in each region in september?
| Bangka-Belitung Islands (Pulau Bangka, Pulau Belitung...) | 86°F to 90°F | 7 à 11 days | 85°F | good weather |
| Central of Sumatra (Padang City, Dumai, Bukittinggi...) | 83°F to 94°F | 9 à 20 days | 85°F to 86°F | tolerable weather* |
| North of Sumatra (Medan, Banda Aceh, Pematangsiantar...) | 79°F to 94°F | 7 à 22 days | 86°F | tolerable weather* |
| Riau Islands (Batam, Tanjungpinang...) | 88°F | 6 à 11 days | 86°F | good weather |
| South of Sumatra (Palembang, Bengkulu, Bandar Lampung...) | 86°F to 95°F | 6 à 12 days | 83°F to 85°F | good weather* |
Where should you go on the island of Sumatra in september when it comes to the weather?
Remember:
The climate on the island of Sumatra in september ranges from good to tolerable depending on the region and city.
Good news: Although it is not perfect the weather in Sumatra in september is, on average, quite good in Palembang, Sibolga, Banda Aceh and Sigli. I allows to savor tour in these locations. And even why not take a little time to relax under the sun!
If you do not go for the sun or the beach, but, for example to go sightseeing, the cities of Langsa, Lac Maninjau, Tanjungpinang, Gunung Leuser National Park, Bandar Lampung, Simpang, Kisaran, Batam, Bukit Lawang, Metro, Jambi City, Bukittinggi, Padangsidempuan, Padang City, Lhokseumawe, Pekanbaru, Medan, Bengkulu, Gunungsitoli (Pulau Nias), Takengon and Pariaman have a OK but just acceptable weather for it in september. Finally, we advise you to avoid you get to Tebingtinggi, lake Toba, Berastagi, Dumai, Payakumbuh, Samosir, Pematangsiantar and Parapat that month because the climate is frankly unfavorable.
Climate on the island of Sumatra in september
Climate in Medan in september
In the month of september, maximum temperature is 94°F and minimum temperature is 77°F (for an average temperature of 85°F). The climate is very hot in this location in the month of september. With 9.4in over 16 days, you will experience some showers throughout your journey. But this is moderate and it will not be continuous.
With a correct climate, the month of september is okay (but not good month) for traveling in this city.
| September | |||
| Average temperature | 85°F | ||
| Highest temperature | 94°F | ||
| Lowest temperature | 77°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 |
Climate in Palembang in september
In the month of september, maximum temperature is 95°F and minimum temperature is 77°F (for an average temperature of 86°F). The climate is very warm in that locality in the month of september. With 4.4in over 7 days, rainfall can happen for your journey. But this is reasonably and you will not be too bothered by it.
With good weather conditions, september is a good month to go in this locality in Indonesia.
| September | |||
| Average temperature | 86°F | ||
| Highest temperature | 95°F | ||
| Lowest temperature | 77°F | ||
| Rainfall | 4.4in | ||
| Number of days with rainfall | 7 day(s) (25%) | ||
| Humidity | 90% | ||
| Daily sunshine hours | 12 | ||
| Cloud cover | 39% | ||
| Length of day | 12:05 | ||
| Our opinion at whereandwhen.net | good |
Climate in Banda Aceh in september
In the month of september, the mean temperature in Banda Aceh is 83°F (maximum temperature is 90°F and minimum temperature is 77°F). The climate is very hot there in this month. With 5.4in over 7 days, rain may occur for your trip. But this is rather reasonably and it is only of temporary showers.
With good weather conditions, the month of september is an advisable month to go in this locality in Indonesia.
| September | |||
| Average temperature | 83°F | ||
| Highest temperature | 90°F | ||
| Lowest temperature | 77°F | ||
| Sea temperature | 85°F | ||
| Rainfall | 5.4in | ||
| Number of days with rainfall | 7 day(s) (23%) | ||
| Humidity | 82% | ||
| Daily sunshine hours | 11 | ||
| Cloud cover | 37% | ||
| Length of day | 12:09 | ||
| Our opinion at whereandwhen.net | good |
Climate in Bandar Lampung in september
In september, the mean temperature in Bandar Lampung is 85°F (maximum temperature is 90°F and minimum temperature is 77°F). The climate is burning in that area in september. With 5.5in over 8 days, rain may occur for your trip. But this is moderate and you will not be too bothered by it.
With a correct climate, september is okay (but not the best time) for traveling there in Sumatra.
| September | |||
| Average temperature | 85°F | ||
| Highest temperature | 90°F | ||
| Lowest temperature | 77°F | ||
| Sea temperature | 84°F | ||
| Rainfall | 5.5in | ||
| Number of days with rainfall | 8 day(s) (27%) | ||
| Humidity | 87% | ||
| Daily sunshine hours | 11 | ||
| Cloud cover | 35% | ||
| Length of day | 12:04 | ||
| Our opinion at whereandwhen.net | good |
Climate in Bengkulu in september
In september, the mean temperature in Bengkulu is 83°F (maximum temperature is 86°F and minimum temperature is 77°F). The climate is burning here in this month. With 8.5in over 12 days, you risk getting wet slightly for your stay. But this is reasonably and it is only of temporary showers.
With a correct climate, the month of september is okay (but not the best time) for traveling in Bengkulu.
| September | |||
| Average temperature | 83°F | ||
| Highest temperature | 86°F | ||
| Lowest temperature | 77°F | ||
| Sea temperature | 83°F | ||
| Rainfall | 8.5in | ||
| Number of days with rainfall | 12 day(s) (41%) | ||
| Humidity | 86% | ||
| Daily sunshine hours | 12 | ||
| Cloud cover | 37% | ||
| Length of day | 12:05 | ||
| Our opinion at whereandwhen.net | tolerable |
All cities on the island of Sumatra in september
| Medan in september | tolerable weather |
| Palembang in september | good weather |
| Banda Aceh in september | good weather |
| Bandar Lampung in september | good weather |
| Bengkulu in september | tolerable weather |
| Bukittinggi in september | tolerable weather |
| Dumai in september | tolerable weather |
| Gunungsitoli (Pulau Nias) in september | tolerable weather |
| Jambi City in september | good weather |
| Padang City in september | bad weather |
| Pematangsiantar in september | tolerable weather |
| Batam in september | good weather |
| Berastagi in september | very bad weather |
| Way Kambas National Park in september | good weather |
| Bukit Lawang in september | tolerable weather |
| Bukit Tigapuluh National Park in september | tolerable weather |
| Calang in september | tolerable weather |
| Kerinci Seblat National Park in september | tolerable weather |
| Lac Maninjau in september | tolerable weather |
| Lake Toba (Danau Toba) in september | very bad weather |
| Parapat in september | tolerable weather |
| Gunung Leuser National Park in september | tolerable weather |
| Payakumbuh in september | tolerable weather |
| Pulau Bangka in september | good weather |
| Pulau Belitung in september | good weather |
| Pulau Rupat in september | tolerable weather |
| Pulau Siberut in september | bad weather |
Weather data for Sumatra in september:
Weather data for Sumatra in september is derived from an average of the weather forecast since 2009 on the island of Sumatra. There is a margin of error and these forecasts are to be considered as general information only. The weather on the island of Sumatra 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 Sumatra.