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September Weather in Siulak, Indonesia

Last updated: August 23, 2025

In September, the average temperature in Siulak, Indonesia is a comfortable 21°C (69°F). Expect a minimum of 14°C (57°F) and a pleasant maximum of 29°C (85°F). However, be prepared for some rain, as 473 mm (18.6 in) of precipitation can fall over 28 days, coupled with an average humidity of 84%.

September Temperature in Siulak

In September in Siulak, the average temperature is 21°C (69°F). Maximums can reach 29°C (85°F) and minimums can be as low as 14°C (57°F). This pleasant weather makes Siulak an ideal destination for travelers seeking a comfortable climate.

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

The chart illustrates September temperature patterns in Siulak, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Siulak, September typically has an average temperature of 21°C (69°F), with highs reaching up to 29°C (85°F) and lows dropping to around 14°C (57°F).
JanFebMarAprMayJunJulAugSepOctNovDec707070707170706969697070
Data source: Temperature data for Siulak 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 Siulak

In Siulak in September, the precipitation amount is 473 mm (18.6 in) spread over 28 days.

September Precipitation Trends in Siulak

The chart displays monthly precipitation patterns in Siulak, 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 Siulak, September typically receives around 473 mm (18.6 inches) of precipitation spread over approximately 28 days.
JanFebMarAprMayJunJulAugSepOctNovDec224321476381390389295362473493434357
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Siulak

In Siulak in September, humidity is 84%. With an average temperature of 21°C (69°F), this humidity feels like a thick blanket enveloping you, making even the simplest outdoor activities feel exhausting and sticky, which can be quite challenging for traveling.

September Average Humidity in Siulak

This chart illustrates the average monthly humidity levels in Siulak, 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 Siulak is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%81%79%80%78%78%79%82%84%85%84%83%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Siulak

In Siulak in September, the maximum UV index reaches an alarming 15, which falls into the extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take precautions. For detailed information, you can check the Hourly UV Index in Siulak.

Maximum UV Index Levels in Siulak for September

The chart shows the monthly maximum UV Index (UVI) for Siulak 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 Siulak typically reaches 15, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec161617161512131515161515
Data source: Siulak 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 Siulak Compares to Other Months

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

This table compares monthly weather conditions in Siulak, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather21°C (70°F)224 mm (8.8 inches)83%extreme
February Weather21°C (70°F)321 mm (12.6 inches)80%extreme
March Weather21°C (70°F)476 mm (18.7 inches)79%extreme
April Weather21°C (71°F)381 mm (15.0 inches)80%extreme
May Weather22°C (71°F)390 mm (15.3 inches)78%extreme
June Weather21°C (70°F)389 mm (15.3 inches)78%extreme
July Weather21°C (70°F)295 mm (11.6 inches)79%extreme
August Weather21°C (70°F)362 mm (14.2 inches)82%extreme
September Weather21°C (69°F)473 mm (18.6 inches)84%extreme
October Weather21°C (69°F)493 mm (19.4 inches)85%extreme
November Weather21°C (70°F)434 mm (17.1 inches)84%extreme
December Weather21°C (70°F)357 mm (14.1 inches)83%extreme

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