Weather in Indonesia for September 2025
In general, the average temperature in Indonesia at the beginning of September is 28.3 °C. As the month progressed, temperatures tended to slightly increase, reaching an average of 28.7 °C by the end of September.
Indonesia in September brings notable rainfall, with an average of 19 rainy days and a total precipitation of 79.2 mm.
Is September a good time to visit Indonesia? check out the best time to travel to Indonesia page.
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Indonesia in September average weather
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  28° | 2  29° | 3 29° | 4 28° | 5 28° | 6 28° | 7 28° |
| 8  28° | 9 28° | 10 28° | 11  28° | 12  29° | 13 28° | 14 29° |
| 15 28° | 16 29° | 17 29° | 18 29° | 19 29° | 20 29° | 21 28° |
| 22 29° | 23 29° | 24 28° | 25 28° | 26 29° | 27 29° | 28 29° |
| 29 29° | 30 29° |
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Temperatures trend during September in Indonesia
September weather day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Overcast | 28° /21° | 0.2 mm | 8 | |
| 2 Sept. | Patchy rain possible | 29° /21° | 0.2 mm | 8 | |
| 3 Sept. | Patchy rain possible | 29° /21° | 0.4 mm | 8 | |
| 4 Sept. | Patchy rain possible | 28° /21° | 0.8 mm | 7 | |
| 5 Sept. | Patchy rain possible | 28° /22° | 0.3 mm | 7 | |
| 6 Sept. | Patchy rain possible | 28° /22° | 1.1 mm | 7 | |
| 7 Sept. | Patchy rain possible | 28° /22° | 1.7 mm | 7 | |
| 8 Sept. | Cloudy | 28° /22° | 0.6 mm | 7 | |
| 9 Sept. | Patchy rain possible | 28° /22° | 7.8 mm | 7 | |
| 10 Sept. | Patchy rain possible | 28° /22° | 4.2 mm | 7 | |
| 11 Sept. | Moderate or heavy rain shower | 28° /22° | 13.1 mm | 7 | |
| 12 Sept. | Partly cloudy | 29° /22° | 4.4 mm | 8 | |
| 13 Sept. | Moderate or heavy rain shower | 28° /22° | 7.1 mm | 7 | |
| 14 Sept. | Moderate or heavy rain shower | 29° /22° | 8.7 mm | 7 | |
| 15 Sept. | Moderate or heavy rain shower | 28° /22° | 1.9 mm | 7 | |
| 16 Sept. | Patchy rain possible | 29° /22° | 1.1 mm | 7 | |
| 17 Sept. | Patchy rain possible | 29° /22° | 0.3 mm | 8 | |
| 18 Sept. | Patchy rain possible | 29° /22° | 0.7 mm | 7 | |
| 19 Sept. | Patchy rain possible | 29° /21° | 0.5 mm | 8 | |
| 20 Sept. | Patchy rain possible | 29° /22° | 3.8 mm | 7 | |
| 21 Sept. | Patchy rain possible | 28° /21° | 4.3 mm | 7 | |
| 22 Sept. | Patchy rain possible | 29° /21° | 2.2 mm | 7 | |
| 23 Sept. | Moderate rain at times | 29° /22° | 2.1 mm | 7 | |
| 24 Sept. | Patchy rain possible | 28° /22° | 2.7 mm | 7 | |
| 25 Sept. | Moderate rain at times | 28° /22° | 1.6 mm | 7 | |
| 26 Sept. | Patchy rain possible | 29° /22° | 1.3 mm | 7 | |
| 27 Sept. | Partly cloudy | 29° /22° | 1.1 mm | 7 | |
| 28 Sept. | Patchy rain possible | 29° /22° | 0.6 mm | 7 | |
| 29 Sept. | Patchy rain possible | 29° /22° | 0.7 mm | 8 | |
| 30 Sept. | Patchy rain possible | 29° /22° | 3.7 mm | 8 | |
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Guide for Indonesia in September
In September, Indonesia experiences varying weather conditions across its diverse regions. At the beginning of the month, the weather in Indonesia is generally warm and humid, with temperatures ranging from 25° to 32° in popular tourist destinations like Bali and Jakarta.
The coastal areas may experience occasional rain showers, while the central and eastern regions might encounter more frequent rainfall.
By the end of September, the weather in Indonesia begins to transition towards the wet season, especially in the western parts of the country. Bali and Jakarta may experience increased precipitation, with temperatures remaining relatively constant around 26° to 31°.
In contrast, the eastern regions, such as Lombok and Komodo, may still enjoy drier and warmer conditions, with temperatures ranging from 27° to 34°.
Overall, September marks the beginning of the transition from the dry to the wet season in Indonesia, offering a mix of weather patterns across the archipelago.
Travelers should be prepared for potential rain showers, especially in the western regions, while still being able to enjoy warm temperatures and outdoor activities in the eastern parts of the country.
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Indonesia in September - FAQ
What to pack to Indonesia in September?
As you prepare for your trip to Indonesia in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Indonesia, during September, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Lightweight Clothing: T-shirts, blouses, shorts, skirts
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Accessories
- Sunglasses: For sun protection
- Sun Hats: Wide-brimmed hats for sun protection in warm weather
- Umbrellas/Raincoats: For rainy days
- Personal Items
- Sunscreen: High SPF for sunny destinations
- Lip Balm with SPF: To protect against chapped lips
September rainfall patterns in Indonesia
UV exposure in Indonesia during September
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Where is Indonesia?Get accurate weather forecasts for Indonesia, located at latitude -8.333 and longitude 115. Stay updated with localized weather information tailored for Indonesia.