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September Weather in Serang, Indonesia

Last updated: August 23, 2025

In September, the average temperature in Serang, Indonesia hovers around 28°C (82°F), making it a warm escape. Expect a minimum of 23°C (74°F) and a peak of 32°C (90°F) on hotter days. With 82 mm (3.2 in) of precipitation spread over 16 days, you might want to pack an umbrella. The average humidity is a balmy 77%, creating a tropical atmosphere perfect for exploring!

September Temperature in Serang

In September in Serang, the average temperature is 28°C (82°F). Maximum temperatures can reach up to 32°C (90°F), while minimums can drop to as low as 23°C (74°F). This mild and warm climate makes it an ideal time for travelers to explore and enjoy outdoor activities in Serang.

September Weather in Serang: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Serang, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Serang, September typically has an average temperature of 28°C (82°F), with highs reaching up to 32°C (90°F) and lows dropping to around 23°C (74°F).
JanFebMarAprMayJunJulAugSepOctNovDec828182838382828282838282
Data source: Temperature data for Serang generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Serang

In Serang in September, the total precipitation amount is 82 mm (3.2 in) distributed over 16 days.

September Precipitation Trends in Serang

The chart displays monthly precipitation patterns in Serang, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Serang, September typically receives around 82 mm (3.2 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec222274247216144103605682117182242
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Serang

In Serang in September humidity is 77%. With an average temperature of 28°C (82°F), this humidity feels like a warm, enveloping blanket that can make outdoor activities sticky and exhausting, but also offers a lush vibrancy to the landscape, perfect for enjoying leisurely strolls in the early morning or late afternoon.

September Average Humidity in Serang

This chart illustrates the average monthly humidity levels in Serang, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Serang is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%86%84%81%80%80%79%77%77%78%80%79%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Serang

In Serang in September, the maximum UV index reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the Hourly UV Index in Serang.

Maximum UV Index Levels in Serang for September

The chart shows the monthly maximum UV Index (UVI) for Serang in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Serang typically reaches 13, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec141616151211101013151514
Data source: Serang September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Serang Compares to Other Months

Weather in Serang varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Serang, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Serang, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather28°C (82°F)222 mm (8.7 inches)84%extreme
February Weather27°C (82°F)274 mm (10.8 inches)86%extreme
March Weather28°C (82°F)247 mm (9.7 inches)84%extreme
April Weather28°C (83°F)216 mm (8.5 inches)81%extreme
May Weather28°C (84°F)144 mm (5.7 inches)80%extreme
June Weather28°C (83°F)103 mm (4.1 inches)80%extreme
July Weather28°C (82°F)60 mm (2.4 inches)79%very high
August Weather28°C (82°F)56 mm (2.2 inches)77%very high
September Weather28°C (82°F)82 mm (3.2 inches)77%extreme
October Weather28°C (83°F)117 mm (4.6 inches)78%extreme
November Weather28°C (83°F)182 mm (7.2 inches)80%extreme
December Weather28°C (82°F)242 mm (9.5 inches)79%extreme

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