Last updated: August 21, 2025
September in Sepang, Indonesia offers a warm tropical climate characterized by a maximum temperature of 31°C (88°F) and an average temperature of 24°C (75°F). Visitors can expect a minimum temperature of 18°C (64°F) during the cooler nights. Rainfall is prevalent, with an average precipitation amount of 63 mm (2.5 in) spread over approximately 8 days, resulting in a humidity level of around 77%. This combination creates a lush and vibrant atmosphere, perfect for experiencing the rich natural beauty of the region, albeit with the occasional rain shower.
In September, Sepang, Indonesia experiences notably warm and pleasant weather, with temperatures typically ranging from a minimum of 18°C (64°F) to a maximum of 31°C (88°F). The average temperature hovers around 24°C (75°F), reflecting a mild climate ideal for outdoor activities. As the month unfolds, the temperatures slightly rise, akin to the preceding months of August and July, which show a gradual increase in warmth. This trend marks a return to the high humidity and warmth characteristic of the region after the cooler mid-year months. With a blend of warm days and mild nights, September serves as a delightful transition towards the end of the year, making it an attractive time for visitors to enjoy the tropical charm of Sepang.
In September, Sepang, Indonesia experiences a noticeable uptick in rainfall compared to the drier months of July and August. With 63 mm (2.5 in) of precipitation spread over 8 days, this month marks a shift back towards the wetter season that characterizes the region. The overall trend reveals a striking contrast to the preceding months, where rainfall dipped to its lowest with just 29 mm (1.2 in) in August. As the heaviest rains loom in the final months of the year, September acts as a gentle reminder of the imminent return of the tropical downpours that define the wet season, paving the way for November's average of 443 mm (17.5 in) and December's peak at 494 mm (19.4 in).
In September, Sepang, Indonesia**'s humidity dips to 77%, continuing the trend set in the previous months of July and August. This decline marks the tail end of the wetter season, where humidity levels had generally hovered above 80% earlier in the year, peaking at 83% in February. As the region transitions into the drier months, with October's levels expected to drop further to 76%, residents and visitors can look forward to slightly more comfortable conditions as the year progresses. The gradual decrease from the summer's peak humidity underscores the predictable rhythm of Sepang’s tropical climate, providing a brief respite until the cycle begins anew.
In September, the UV Index in Sepang, Indonesia, soars to a striking 15, categorizing it as extreme and resulting in a burn time of just 10 minutes. This trend of high UV exposure is consistent throughout the year, with January to March and October also reporting the same extreme levels. Notably, while it dips slightly in April and May, the UV Index remains very high, emphasizing the importance of sun protection year-round. As you soak up the sun in this beautiful coastal city, make sure to stay vigilant and take precautions against UV exposure. For more details, check out the full Sepang UV Index.
UV Risk Categories
As September sweeps in, Sepang, Indonesia basks in an impressive 303 hours of sunshine, solidifying its reputation as a sun-soaked paradise. This month’s sunshine hours are a slight dip from the peak of 312 hours in August but still reflect a remarkable consistency, continuing a trend of luminous days seen throughout the dry season. From 220 hours in January to a stark increase of 306 hours in July, the pattern reveals a gradual intensification of sunlight, reaching its zenith in October with 317 hours. With such abundant sunshine, September stands as a charming bridge, inviting outdoor adventures and beach escapades while hinting at the vibrant days that lie ahead.
In Sepang, Indonesia, the likelihood of sunny weather in September offers a moderate opportunity for sunshine, with a 25% chance of clear skies. This marks a notable decline from the sunnier months of April through July, where chances ranged from 29% to 36%. Conversely, this September likelihood is a slight improvement compared to the gloomier months of November and December, which experience just 4% to 8% sunny days. As the year transitions into the final quarter, September stands as a pivotal month, balancing between the brighter days of mid-year and the cloudier tendencies that follow.
In Sepang, Indonesia, September marks a transition back to longer daylight hours, with the day extending to 12 hours. This aligns with the trend observed at the beginning of the year, where daylight also consistently spans 12 hours from January through March. Following this bright start, daylight gradually shortens during the mid-year months of April to August, dropping to 11 hours. However, as September arrives, the cycle renews, bringing a delightful balance of light that persists into the later months of October and November. This natural rhythm of daylight offers residents and visitors alike an opportunity to embrace the vibrant experiences of this tropical region as the days grow longer once more.
As September graces Sepang, Indonesia, the gentle caress of the wind becomes a notable companion, with an average speed of 1.7 m/s (4 mph). This month marks a slight increase compared to the preceding months, aligning with a late summer trend where breezy conditions often refresh the tropical atmosphere. Following the steadiness of August's 1.8 m/s, September maintains this rhythm, suggesting a consistency in wind patterns as the region transitions towards the final quarter of the year. Interestingly, after a few months of lower speeds during the mid-year, September reflects an upswing in wind activity, hinting at the gradual culmination of seasonal changes that enhance the island’s vibrant outdoor experiences.
Weather in Sepang varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Sepang, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, the weather features a warm and pleasant climate with temperatures ranging from a minimum of 18°C (64°F) to a maximum of 31°C (88°F). With an average temperature of 24°C (75°F), September sees about 63 mm (2.5 in) of rain over approximately 8 days and humidity levels at 77%.
In contrast, January tends to be slightly warmer with temperatures starting at a minimum of 20°C (69°F) and still peaking at 31°C (88°F), maintaining a similar average of 24°C (76°F). However, January is significantly wetter, experiencing about 449 mm (17.7 in) of precipitation spread over 25 days, along with a slight increase in humidity at 79%. For more details, you can visit Sepang weather in January.
In September, the weather typically features a comfortable range with minimum temperatures around 18°C (64°F) and maximums reaching up to 31°C (88°F), alongside an average of 24°C (75°F). The month experiences moderate precipitation, totaling 63 mm (2.5 in) over approximately 8 rainy days and a humidity level of 77%. In contrast, February tends to be more humid, with temperatures ranging from a minimum of 21°C (70°F) to a maximum of 30°C (87°F) and an average of 24°C (76°F). This month is notably wetter, receiving 463 mm (18.2 in) of rainfall spread over 28 days, resulting in higher humidity at 83%. For a more detailed comparison of weather patterns, you can visit Sepang weather in February.
September and March present distinct weather patterns, despite sharing similar average temperatures. In September, temperatures range from a minimum of 18°C (64°F) to a maximum of 31°C (88°F), with an average of 24°C (75°F), and the month sees 63 mm (2.5 in) of precipitation over 8 days with a humidity level of 77%. In contrast, March experiences slightly warmer minimum temperatures at 21°C (70°F) and maintains the same maximum of 31°C (87°F), but features significantly higher rainfall at 488 mm (19.2 in) over 30 days, resulting in increased humidity at 82%. For more details, check Sepang weather in March.
In comparing the weather of September and April, both months present warm temperatures, but April tends to be slightly warmer overall. September's temperatures range from a minimum of 18°C to a maximum of 31°C, averaging around 24°C. In contrast, April has temperatures that begin at 20°C and peak at 30°C, with an average of 25°C. However, April is also characterized by significantly higher precipitation, with 331 mm falling over 25 days, compared to September's 63 mm over just 8 days. Humidity levels are similar, with April at 80% and September at 77%, contributing to a muggy atmosphere in both months. For more details on April weather in this region, visit Sepang weather in April.
In comparing September and May weather, both months experience fairly warm temperatures, with September showcasing a minimum of 18°C and a maximum of 31°C, while May's temperatures range slightly higher from a minimum of 19°C to a maximum of 30°C. The average temperature for both months hovers around 24°C. However, May is notably wetter, with 134 mm of precipitation spread across 16 days compared to September's 63 mm over 8 days, resulting in a more humid environment, with humidity levels peaking at 81% in May versus 77% in September. For more information, you can check Sepang weather in May.
When comparing the weather in September and June, both months share similar minimum and average temperatures, with September reaching a maximum of 31°C (88°F) compared to June’s 29°C (85°F). However, September is relatively drier, receiving 63 mm (2.5 in) of precipitation over 8 days, while June experiences more rainfall with 103 mm (4.0 in) across 13 days. Humidity levels are quite comparable, with September at 77% and June slightly higher at 79%. For more detailed information about June weather, check out Sepang weather in June.
When comparing the weather in September and July, both months exhibit fairly similar conditions, yet some notable differences emerge. In September, temperatures range from a minimum of 18°C (64°F) to a maximum of 31°C (88°F), with an average of 24°C (75°F). In contrast, July has slightly cooler temperatures, with a minimum of 17°C (64°F) and a maximum of 29°C (84°F), averaging 23°C (73°F). Additionally, September experiences more precipitation, averaging 63 mm (2.5 in) over 8 days, compared to July's 47 mm (1.8 in) with the same number of rainy days. Both months maintain a consistent humidity level of 77%. For more details on the weather patterns, you can visit Sepang weather in July.
In comparing the weather of September to that of August, we observe a slight increase in temperatures, with September averaging 24°C (75°F) compared to August's 23°C (74°F). The maximum temperature in September reaches 31°C (88°F), slightly higher than August's max of 30°C (86°F). Both months experience consistent humidity levels at 77%, but September sees significantly more precipitation at 63 mm (2.5 in) over 8 days, compared to August's 29 mm (1.2 in) over 7 days. For more detailed insights, you can visit Sepang weather in August.
In September, temperatures in the region experienced a range from a minimum of 18°C (64°F) to a maximum of 31°C (88°F), with an average of 24°C (75°F). The month saw 63 mm (2.5 in) of precipitation over 8 days, accompanied by a humidity level of 77%. In contrast, October tends to be slightly warmer, with minimum temperatures of 19°C (67°F) and a maximum reaching 32°C (91°F), yielding an average of 25°C (77°F). However, October also brings increased rainfall, with precipitation of 110 mm (4.3 in) over 12 days and a similar humidity level of 76%. For more detailed information about the weather patterns, you can visit Sepang weather in October.
In September, the weather features a minimum temperature of 18°C (64°F) and an average of 24°C (75°F), with maximum temperatures reaching up to 31°C (88°F). The month experiences moderate rainfall, totaling 63 mm (2.5 in) over about 8 days, and humidity levels are relatively high at 77%. In contrast, November sees a slight increase in temperatures, with minimums of 21°C (69°F) and averages of 25°C (77°F), while the maximum can peak at 33°C (92°F). However, November is significantly wetter, receiving 443 mm (17.5 in) of rain over 23 days, resulting in only a marginally lower humidity of 76%. For a more detailed comparison, you can check Sepang weather in November.
In September, the weather features a warm average temperature of 24°C (75°F), with daytime highs reaching up to 31°C (88°F) and relatively low precipitation of 63 mm (2.5 in) over 8 days. In contrast, December sees a slight increase in average temperature to 25°C (77°F), but it also experiences significantly higher rainfall at 494 mm (19.4 in) across 29 days. Despite a slightly cooler average humidity of 76% in December compared to September’s 77%, the overall climate feels much wetter, making it a more challenging time for outdoor activities. For more details about the weather in December, you can check Sepang weather in December.
As September unfolds in Sepang, the weather presents a delightful blend of warmth and humidity. With average temperatures hovering around 24°C, it feels pleasantly mild compared to the sweltering heat of the summer months. The occasional rainfall—spanning about eight days and totaling 63 mm—adds a refreshing touch, making this month feel more dynamic than others. Even though humidity remains high at 77%, the cooler nights provide a welcome relief, creating an inviting atmosphere for visitors. Discover more about the delightful nuances of this month by exploring the full details at Sepang Climate.