September Weather in Herlen, Mongolia

Last updated: August 28, 2025

In Herlen, Mongolia, the average temperature in September hovers around 12°C (54°F), with a notable range from a chilly -7°C (20°F) to a balmy 31°C (88°F). Expect about 28 mm (1.1 in) of precipitation spread over 5 days, contributing to an average humidity level of 68%. Whether you're preparing for a brisk day or a warm afternoon, be ready for a mix of weather!

September Temperature in Herlen

In September in Herlen, the average temperature is 12°C (54°F). Maximums can reach 31°C (88°F), while lows can drop to -7°C (20°F). Travelers should be prepared for a wide range of temperatures, from warm days to chilly nights.

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

The chart illustrates September temperature patterns in Herlen, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Herlen, September typically has an average temperature of 12°C (54°F), with highs reaching up to 31°C (88°F) and lows dropping to around -7°C (20°F).

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

September Precipitation in Herlen

In Herlen in September, the precipitation amount is 28 mm (1.1 in) over a period of 5 days.

September Precipitation Trends in Herlen

The chart displays monthly precipitation patterns in Herlen, 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 Herlen, September typically receives around 28 mm (1.1 inches) of precipitation spread over approximately 5 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Herlen

In Herlen in September, humidity is 68%. With an average temperature of 12°C (54°F), this humidity feels like a damp chill that can make exploring the area a bit uncomfortable, often requiring warm layers to stay cozy while sightseeing.

September Average Humidity in Herlen

This chart illustrates the average monthly humidity levels in Herlen, 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 Herlen is approximately 68%, 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 Herlen

In Herlen in September, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Herlen, you can refer to this Hourly UV Index in Herlen.

Maximum UV Index Levels in Herlen for September

The chart shows the monthly maximum UV Index (UVI) for Herlen 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 Herlen typically reaches 6, which falls under the high exposure category.

Data source: Herlen 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 Herlen Compares to Other Months

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

This table compares monthly weather conditions in Herlen, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-21°C (-6°F)	2 mm (0.1 inches)	85%	low
February Weather	-17°C (2°F)	3 mm (0.1 inches)	75%	moderate
March Weather	-4°C (25°F)	4 mm (0.1 inches)	55%	moderate
April Weather	5°C (41°F)	8 mm (0.3 inches)	54%	high
May Weather	12°C (54°F)	19 mm (0.7 inches)	52%	very high
June Weather	19°C (66°F)	32 mm (1.2 inches)	51%	very high
July Weather	21°C (70°F)	66 mm (2.6 inches)	64%	very high
August Weather	17°C (64°F)	75 mm (2.9 inches)	67%	very high
September Weather	12°C (54°F)	28 mm (1.1 inches)	68%	high
October Weather	2°C (35°F)	14 mm (0.5 inches)	65%	moderate
November Weather	-9°C (15°F)	9 mm (0.3 inches)	63%	low
December Weather	-19°C (-2°F)	3 mm (0.1 inches)	80%	low