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September Weather in Sleman, Indonesia

Last updated: August 23, 2025

In September, the average temperature in Sleman, Indonesia hovers around 25°C (76°F). Expect comfortable days with a minimum temperature of 18°C (64°F) and a maximum reaching up to 33°C (91°F). However, stay prepared for occasional rain, with an average precipitation of 84 mm (3.3 in) spread over 13 days and a humidity level of about 70%.

September Temperature in Sleman

In September in Sleman, the average temperature is 25°C (76°F), with maximums reaching 33°C (91°F) and minimums dropping as low as 18°C (64°F). This pleasant climate makes it an ideal destination for travelers seeking warm weather and enjoyable outdoor activities.

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

The chart illustrates September temperature patterns in Sleman, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sleman, September typically has an average temperature of 25°C (76°F), with highs reaching up to 33°C (91°F) and lows dropping to around 18°C (64°F).
JanFebMarAprMayJunJulAugSepOctNovDec797979807978757576777879
Data source: Temperature data for Sleman 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 Sleman

In Sleman in September, the precipitation amount is 84 mm (3.3 in) during 13 days, indicating a relatively wet period for that time of year.

September Precipitation Trends in Sleman

The chart displays monthly precipitation patterns in Sleman, 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 Sleman, September typically receives around 84 mm (3.3 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec32035833026311299252584162382364
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Sleman

In Sleman in September humidity is 70%. With an average temperature of 25°C (76°F), this humidity feels like a warm blanket wrapping around you, making outdoor activities a bit sticky but still enjoyable for exploring local attractions and savoring the vibrant culture.

September Average Humidity in Sleman

This chart illustrates the average monthly humidity levels in Sleman, 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 Sleman is approximately 70%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%86%84%80%81%81%78%74%70%72%73%75%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Sleman

In Sleman 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 Sleman.

Maximum UV Index Levels in Sleman for September

The chart shows the monthly maximum UV Index (UVI) for Sleman 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 Sleman typically reaches 15, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec151616141310111315161514
Data source: Sleman 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 Sleman Compares to Other Months

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

This table compares monthly weather conditions in Sleman, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather26°C (79°F)320 mm (12.6 inches)82%extreme
February Weather26°C (79°F)358 mm (14.1 inches)86%extreme
March Weather26°C (79°F)330 mm (13.0 inches)84%extreme
April Weather26°C (80°F)263 mm (10.4 inches)80%extreme
May Weather26°C (80°F)112 mm (4.4 inches)81%extreme
June Weather25°C (78°F)99 mm (3.9 inches)81%very high
July Weather24°C (76°F)25 mm (1.0 inches)78%extreme
August Weather24°C (75°F)25 mm (1.0 inches)74%extreme
September Weather25°C (76°F)84 mm (3.3 inches)70%extreme
October Weather25°C (78°F)162 mm (6.4 inches)72%extreme
November Weather26°C (79°F)382 mm (15.1 inches)73%extreme
December Weather26°C (79°F)364 mm (14.3 inches)75%extreme

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