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September Weather in Pematangsiantar, Indonesia

Last updated: August 23, 2025

In September, the average temperature in Pematangsiantar, Indonesia hovers around 24°C (76°F), creating a warm and inviting atmosphere. Expect a minimum temperature of 20°C (68°F) and a maximum reaching 31°C (88°F). However, don’t forget your umbrella, as precipitation can amount to 379 mm (14.9 in) over 29 days, contributing to an average humidity level of 89%.

September Temperature in Pematangsiantar

In September in Pematangsiantar, the average temperature is 24°C (76°F). The maximum can reach 31°C (88°F) and the minimum can be as low as 20°C (68°F). This pleasant weather makes it an ideal time for outdoor activities and exploration.

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

The chart illustrates September temperature patterns in Pematangsiantar, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Pematangsiantar, September typically has an average temperature of 24°C (76°F), with highs reaching up to 31°C (88°F) and lows dropping to around 20°C (68°F).
JanFebMarAprMayJunJulAugSepOctNovDec757676777777777676767675
Data source: Temperature data for Pematangsiantar 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 Pematangsiantar

In Pematangsiantar in September, the precipitation amount is 379 mm (14.9 in) that falls over a duration of 29 days.

September Precipitation Trends in Pematangsiantar

The chart displays monthly precipitation patterns in Pematangsiantar, 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 Pematangsiantar, September typically receives around 379 mm (14.9 inches) of precipitation spread over approximately 29 days.
JanFebMarAprMayJunJulAugSepOctNovDec210176185230344281224251379339407322
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Pematangsiantar

In Pematangsiantar in September, humidity is 89%. With an average temperature of 24°C (76°F), this humidity feels like a heavy, warm blanket wrapping around you, making outdoor activities challenging and requiring frequent hydration.

September Average Humidity in Pematangsiantar

This chart illustrates the average monthly humidity levels in Pematangsiantar, 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 Pematangsiantar is approximately 89%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%74%74%77%83%85%84%87%89%89%88%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Pematangsiantar

In Pematangsiantar 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 Pematangsiantar.

Maximum UV Index Levels in Pematangsiantar for September

The chart shows the monthly maximum UV Index (UVI) for Pematangsiantar 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 Pematangsiantar typically reaches 15, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec131516151512131415151412
Data source: Pematangsiantar 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 Pematangsiantar Compares to Other Months

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

This table compares monthly weather conditions in Pematangsiantar, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather24°C (76°F)210 mm (8.3 inches)83%extreme
February Weather24°C (76°F)176 mm (6.9 inches)74%extreme
March Weather25°C (77°F)185 mm (7.3 inches)74%extreme
April Weather25°C (77°F)230 mm (9.0 inches)77%extreme
May Weather25°C (78°F)344 mm (13.6 inches)82%extreme
June Weather25°C (77°F)281 mm (11.1 inches)85%extreme
July Weather25°C (77°F)224 mm (8.8 inches)84%extreme
August Weather25°C (77°F)251 mm (9.9 inches)87%extreme
September Weather24°C (76°F)379 mm (14.9 inches)89%extreme
October Weather24°C (76°F)339 mm (13.3 inches)89%extreme
November Weather24°C (76°F)407 mm (16.0 inches)88%extreme
December Weather24°C (76°F)322 mm (12.7 inches)88%extreme

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