Last updated: August 21, 2025
September in Batam, Indonesia offers a warm tropical climate, with maximum temperatures reaching up to 29°C (85°F) and an average of 27°C (82°F), ensuring balmy days for visitors. However, the month is characterized by notable precipitation, accumulating 186 mm (7.3 in) across approximately 22 days, contributing to a high humidity level of 84%. This combination of warmth and moisture creates a lush environment, perfect for exploring the island’s natural beauty, though it’s advisable to pack an umbrella for those frequent rain showers.
In September, Batam, Indonesia, continues to bask in warm tropical temperatures, with minimums holding steady at 25°C (77°F) and an average of 27°C (82°F). The maximum temperatures reach a pleasant 29°C (85°F), mirroring the climate experienced in the preceding months. This slight dip from the peak summer heat in August—where averages were consistently around the same range—indicates a gentle transition into the wetter season. With mild temperatures and occasional showers starting to appear, September offers a comfortable balance, making it an inviting time for visitors to enjoy all that Batam has to offer while still embracing the tropical allure of its sun-drenched days.
In September, Batam experiences a notable shift in its weather patterns, as precipitation reaches 186 mm (7.3 in), continuing the trend of significant rainfall seen since the start of the wet season. This month sees rain on 22 days, aligning with the heightened precipitation typical of the transition from the dry months to the wetter season ahead. As the region moves into October, which averages 212 mm (8.4 in) over 25 days, the cumulative effect of September's rainfall sets the stage for what will soon become the most water-laden months of the year, particularly November with its peak of 352 mm (13.9 in). Overall, September marks a pivotal moment, bridging the drier summer with the forthcoming deluge, highlighting the region's lush, tropical climate.
In September, Batam, Indonesia, experiences a slight dip in humidity, averaging at 84%. This month continues the trend of relatively high humidity levels characteristic of the region, which peaks earlier in the year around January with an impressive 88%. After this peak, humidity gradually decreases until May, when it levels off at an average of 83% for several months. As the year progresses into the latter part, humidity levels stabilize around 84%, emphasizing Batam's tropical climate. The return to higher humidity in December, reaching 87%, hints at the onset of the rainy season, creating a rhythmic pattern in Batam's atmospheric conditions throughout the year.
In September, Batam, Indonesia, experiences a UV Index of 14, maintaining its status in the extreme exposure category, with a burn time of just 10 minutes. This consistency in high UV levels, echoed from previous months, highlights the region's relentless sun, particularly from January through October, where figures rarely dip below 12. Interestingly, the UV Index has seen a slight fluctuation, peaking at 16 in March before settling into the 14 range for both August and September. For locals and visitors alike, this data emphasizes the need for vigilant sun protection during these intensely sunny months. Stay informed and safe by checking the current levels at Batam UV Index.
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As the calendar turns to September, Batam, Indonesia, enjoys a delightful average of 299 hours of sunshine, marking a subtle dip compared to the lively August with its 321 hours. This slight reduction doesn't diminish the island’s charm; rather, it reflects the transitional nature of the month, as the dry season edges closer to its finale. Throughout the year, Batam typically bathes in abundant sunlight, peaking in March with an impressive 330 hours. From both the warm glow of early summer to the gentle embrace of the wet season, September's soothing rays invite visitors to indulge in the island's natural beauty and vibrant culture.
As September rolls into Batam, Indonesia, the likelihood of enjoying sunny weather peaks at 26%, making it one of the sunniest months of the year. This upward trend is notable when compared to the preceding months, particularly August's 11%, which reveals just how much more favorable September is for outdoor activities and exploration. Following a relatively dry snapshot from mid-year, visitors can expect a refreshing boost in sunshine, signaling the approach of the more vibrant and inviting days of early fall. Whether you're planning beach excursions or cultural outings, September stands out as a promising time to bask in Batam's warm tropical embrace.
In Batam, Indonesia, September maintains the city’s characteristic 12 hours of daylight, a trend that continues consistently throughout the year. This consistent daylight duration, from January to December, creates a rhythmic pattern that signifies the equatorial climate, where the sun rises and sets with remarkable regularity. As the equinox approaches, Batam residents and visitors can enjoy the reliable blend of daylight and evening, perfect for outdoor activities and exploring the vibrant culture of this beautiful island without the frustration of fluctuating day lengths.
As September arrives in Batam, Indonesia, the wind whispers at an average speed of 3.9 m/s (9 mph), reflecting a slight decrease from the bustling breezes of earlier months. This trend marks a transition from the moderate winds of July and August, which hovered around 4.5 m/s and 4.1 m/s respectively, hinting at a gradual shift towards calmer conditions as the year progresses. While September's winds are milder compared to the peak months, they still offer a refreshing touch, perfect for leisurely outdoor activities. As we move into October, we can anticipate even gentler breezes, with average speeds expected to drop further to 3.5 m/s (8 mph), continuing the trend of softening winds as the dry season approaches its end.
Weather in Batam varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Batam, focusing on differences in temperature, rainfall, humidity, and UV levels.
In comparing the weather between September and January, both months experience similar temperature ranges, with minimums of 25°C (77°F) in September and 24°C (76°F) in January, while daily averages hover around 27°C (80°F). However, January sees slightly higher precipitation, with 200 mm (7.9 in) over 18 days compared to September's 186 mm (7.3 in) over 22 days. Additionally, humidity levels are higher in January at 88%, compared to 84% in September. For a closer look at the specific conditions in January, you can visit Batam weather in January.
September and February share similar temperature ranges, with both months featuring minimum temperatures of 25°C (77°F), average temperatures around 27°C (82°F), and maximum temperatures peaking at 29°C (85°F) in September and 29°C (84°F) in February. However, September is considerably wetter, receiving 186 mm (7.3 in) of rain over 22 days, compared to February's milder 74 mm (2.9 in) spread over 12 days. The humidity levels are comparable, with September at 84% and February slightly higher at 85%. For more detailed information on the weather in February, you can check Batam weather in February.
In comparing September and March weather, both months exhibit similar temperature patterns, with minimums around 25°C (77°F), averages near 27°C (82°F), and maximums reaching up to 29°C (85°F). However, September tends to be wetter, receiving 186 mm (7.3 in) of precipitation over 22 days, compared to March's 137 mm (5.4 in) over 17 days. Interestingly, March experiences slightly higher humidity at 86% compared to September's 84%. For more detailed insights, you can check Batam weather in March.
When comparing the weather in September and April, both months exhibit warm temperatures, with April being slightly hotter on average. In September, the minimum temperature is 25°C, with an average of 27°C and a maximum of 29°C, while April sees a minimum of 25°C, an average of 28°C, and a maximum of 30°C. Precipitation is higher in April, totaling 222 mm over 25 days, compared to September's 186 mm across 22 days. Despite the differences in rainfall, both months maintain a consistent humidity level of 84%. For more detailed information, check Batam weather in April.
In comparing the weather of September and May, both months exhibit warm temperatures with similar minimums around 25°C (77°F). However, May tends to be slightly warmer overall, with an average temperature of 28°C (83°F) and a maximum of 30°C (86°F), compared to September's average of 27°C (82°F) and a maximum of 29°C (85°F). Precipitation levels are higher in May, with 256 mm (10.1 in) falling over 28 days, compared to September's 186 mm (7.3 in) over 22 days, resulting in a wetter month. Interestingly, both months share high humidity levels, with May at 83% and September at 84%. For more detailed insights about May weather, visit Batam weather in May.
In comparing the weather between September and June, both months experience high temperatures, with September recording a minimum of 25°C (77°F), an average of 27°C (82°F), and a maximum of 29°C (85°F), while June is slightly warmer with a minimum of 25°C (77°F), an average of 28°C (82°F), and a maximum of 30°C (86°F). However, June tends to be wetter, with precipitation averaging 262 mm (10.3 in) over 26 days compared to September's 186 mm (7.3 in) across 22 days. The humidity level remains quite similar, with September at 84% and June at 83%. For more detailed insights about June weather, you can check Batam weather in June.
In comparing the weather between September and July, we find that both months exhibit fairly similar temperature ranges, with September having a minimum temperature of 25°C (77°F) and a maximum of 29°C (85°F), while July shows a slightly higher maximum of 30°C (86°F). July's average temperature at 28°C (82°F) is marginally warmer than September's average of 27°C (82°F). Precipitation levels indicate that July is slightly wetter, with 210 mm (8.3 in) of rainfall over 21 days compared to September's 186 mm (7.3 in) across 22 days. Humidity remains consistently high in both months, with September at 84% and July at 83%. For more detailed insights on July weather patterns, you can refer to Batam weather in July.
In September, the weather remains similar to August, with both months experiencing a minimum temperature of 25°C (77°F) and a maximum of 29°C (85°F). However, September sees a slight decrease in the average temperature, dropping to 27°C (82°F) compared to August's 28°C (82°F). Precipitation levels are slightly higher in September, with 186 mm (7.3 in) of rain over 22 days, compared to 181 mm (7.1 in) during the same number of days in August. Humidity levels are also similar, with September at 84% and August at 85%. For more detailed information on August weather patterns, you can check Batam weather in August.
September and October share similar average temperatures, with September having a minimum of 25°C (77°F), an average of 27°C (82°F), and a maximum of 29°C (85°F). In comparison, October sees a slight increase, reaching a maximum of 30°C (86°F). Both months experience high humidity levels at 84%, but October tends to be wetter, with precipitation increasing from 186 mm (7.3 in) over 22 days in September to 212 mm (8.4 in) across 25 days in October. This shift suggests that October might feel a bit more oppressive due to the added rainfall. For more details, you can check Batam weather in October.
In comparing the weather between September and November, both months feature similar temperature ranges, with minimums around 25°C (77°F), averages close to 27°C (81°F), and maximums reaching up to 29°C (85°F). However, November is characterized by significantly higher precipitation, totaling 352 mm (13.9 in) over 27 days, compared to September's 186 mm (7.3 in) over 22 days. Despite the unchanging humidity level of 84% in both months, the increased rainfall in November makes it markedly wetter. For more detailed information, you can explore Batam weather in November.
In September, temperatures in Batam typically range from a minimum of 25°C (77°F) to a maximum of 29°C (85°F), with an average temperature around 27°C (82°F). The month experiences considerable rainfall, totaling 186 mm (7.3 in) over 22 days and humidity levels averaging 84%. In contrast, December maintains a similar temperature profile with a minimum of 25°C (77°F), an average of 27°C (81°F), and a maximum of 29°C (85°F). However, it experiences higher precipitation, reaching 246 mm (9.7 in) over 24 days, coupled with increased humidity of 87%. For more detailed information on Batam's December weather, you can check Batam weather in December.
As September rolls in, Batam experiences a tropical embrace, characterized by warm temperatures and significant humidity. With average highs around 27°C (82°F) and frequent rainfall—spanning nearly three-quarters of the month—this period stands out from other months with its lush greenery and vibrant landscapes. The island's air feels particularly moist, as humidity levels hover around 84%, making it essential for visitors to stay hydrated and prepared for sudden downpours. Despite the rain, September's allure remains, offering a unique charm for those seeking an invigorating escape. For a deeper dive into what Batam has to offer throughout the year, check out Batam Climate.