September Weather in Medan, Indonesia

Last updated: August 23, 2025

In Medan, Indonesia, the average temperature in September hovers around 27°C (80°F), creating a warm and inviting atmosphere. Expect temperatures to range from a minimum of 22°C (71°F) to a maximum of 34°C (93°F), offering a pleasant climate for outdoor activities. However, be prepared for frequent rain, with a significant precipitation amount of 354 mm (14.0 in) over 27 days. With an average humidity level of 89%, it's advisable to stay hydrated and embrace the lush environment!

September Temperature in Medan

In September in Medan, the average temperature is 27°C (80°F). Maximum temperatures can reach 34°C (93°F), while minimums can dip to as low as 22°C (71°F). This warm climate makes Medan an ideal destination for travelers seeking summer adventures.

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

The chart illustrates September temperature patterns in Medan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Medan, September typically has an average temperature of 27°C (80°F), with highs reaching up to 34°C (93°F) and lows dropping to around 22°C (71°F).

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

September Precipitation in Medan

In Medan in September, the precipitation amount reaches 354 mm (14.0 in) over the course of 27 days.

September Precipitation Trends in Medan

The chart displays monthly precipitation patterns in Medan, 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 Medan, September typically receives around 354 mm (14.0 inches) of precipitation spread over approximately 27 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 Medan

In Medan in September humidity is 89%. With an average temperature of 27°C (80°F), this humidity feels like a warm, sticky embrace, making travel feel heavy and reminiscent of a sauna, where even the slightest exertion can leave you feeling drenched and yearning for a cool breeze.

September Average Humidity in Medan

This chart illustrates the average monthly humidity levels in Medan, 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 Medan is approximately 89%, 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 Medan

In Medan in September, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in Medan, you can check here.

Maximum UV Index Levels in Medan for September

The chart shows the monthly maximum UV Index (UVI) for Medan 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 Medan typically reaches 14, which falls under the extreme exposure category.

Data source: Medan 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 Medan Compares to Other Months

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

This table compares monthly weather conditions in Medan, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	26°C (80°F)	177 mm (7.0 inches)	83%	extreme
February Weather	27°C (81°F)	113 mm (4.4 inches)	74%	extreme
March Weather	27°C (81°F)	146 mm (5.8 inches)	74%	extreme
April Weather	27°C (82°F)	241 mm (9.5 inches)	77%	extreme
May Weather	27°C (82°F)	335 mm (13.2 inches)	82%	extreme
June Weather	27°C (81°F)	204 mm (8.0 inches)	85%	extreme
July Weather	27°C (81°F)	227 mm (9.0 inches)	84%	extreme
August Weather	27°C (81°F)	239 mm (9.4 inches)	87%	extreme
September Weather	27°C (80°F)	354 mm (14.0 inches)	89%	extreme
October Weather	27°C (80°F)	344 mm (13.5 inches)	89%	extreme
November Weather	26°C (80°F)	384 mm (15.1 inches)	88%	extreme
December Weather	26°C (80°F)	320 mm (12.6 inches)	88%	extreme