September Weather in Semalang, Indonesia

Last updated: August 23, 2025

In Semalang, Indonesia, the average temperature in September reaches a pleasant 23°C (74°F). Expect a minimum of 17°C (62°F) and a maximum of 30°C (86°F), providing a comfortable climate for various activities. With precipitation averaging 49 mm (1.9 in) over 13 days, and an average humidity of 77%, it's advisable to pack an umbrella alongside your sunblock for this vibrant season!

September Temperature in Semalang

In September in Semalang, the average temperature is 23°C (74°F), with maximums reaching 30°C (86°F) and minimums dropping to as low as 17°C (62°F). This pleasant climate makes Semalang an ideal destination for travelers seeking mild weather and enjoyable outdoor activities.

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

The chart illustrates September temperature patterns in Semalang, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Semalang, September typically has an average temperature of 23°C (74°F), with highs reaching up to 30°C (86°F) and lows dropping to around 17°C (62°F).

Data source: Temperature data for Semalang generated using information from the Copernicus Climate Change Service.

September Precipitation in Semalang

In Semalang in September, the precipitation amount is 49 mm (1.9 in) over the course of 13 days.

September Precipitation Trends in Semalang

The chart displays monthly precipitation patterns in Semalang, 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 Semalang, September typically receives around 49 mm (1.9 inches) of precipitation spread over approximately 13 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Semalang

In Semalang in September, humidity is 77%. With an average temperature of 23°C (74°F), this humidity feels like being enveloped in a warm, sticky blanket, making travel somewhat uncomfortable and requiring frequent hydration breaks to enjoy the sights without feeling overheated.

September Average Humidity in Semalang

This chart illustrates the average monthly humidity levels in Semalang, 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 Semalang is approximately 77%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Semalang

In Semalang 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 Semalang.

Maximum UV Index Levels in Semalang for September

The chart shows the monthly maximum UV Index (UVI) for Semalang 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 Semalang typically reaches 15, which falls under the extreme exposure category.

Data source: Semalang 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 Semalang Compares to Other Months

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

This table compares monthly weather conditions in Semalang, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	25°C (77°F)	418 mm (16.5 inches)	79%	extreme
February Weather	25°C (77°F)	472 mm (18.6 inches)	83%	extreme
March Weather	25°C (77°F)	371 mm (14.6 inches)	82%	extreme
April Weather	25°C (78°F)	204 mm (8.0 inches)	80%	extreme
May Weather	25°C (76°F)	74 mm (2.9 inches)	81%	extreme
June Weather	24°C (75°F)	74 mm (2.9 inches)	79%	very high
July Weather	22°C (73°F)	55 mm (2.1 inches)	77%	extreme
August Weather	22°C (73°F)	57 mm (2.2 inches)	77%	extreme
September Weather	23°C (74°F)	49 mm (1.9 inches)	77%	extreme
October Weather	24°C (76°F)	70 mm (2.7 inches)	76%	extreme
November Weather	25°C (77°F)	291 mm (11.4 inches)	76%	extreme
December Weather	25°C (78°F)	320 mm (12.6 inches)	76%	extreme