September Weather in Altan, Mongolia

Last updated: August 28, 2025

In Altan, Mongolia, the average temperature for September hovers around 10°C (50°F). Expect a range of temperatures, with minima plummeting to -8°C (17°F) and maxima soaring to 28°C (82°F). During this time, precipitation is modest, with 15 mm (0.6 in) spread over approximately 4 days. Additionally, the average humidity sits at a comfortable 59%, making for an interesting month of weather!

September Temperature in Altan

In September in Altan, the average temperature is 10°C (50°F). Maximum can reach 28°C (82°F) and minimum can be as low as -8°C (17°F). It's advisable to pack for a range of temperatures and be prepared for both warm days and chilly nights while traveling in this region.

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

The chart illustrates September temperature patterns in Altan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Altan, September typically has an average temperature of 10°C (50°F), with highs reaching up to 28°C (82°F) and lows dropping to around -8°C (17°F).

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

September Precipitation in Altan

In Altan in September, the precipitation amount is 15 mm (0.6 in) occurring over the course of 4 days.

September Precipitation Trends in Altan

The chart displays monthly precipitation patterns in Altan, 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 Altan, September typically receives around 15 mm (0.6 inches) of precipitation spread over approximately 4 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 Altan

In Altan in September humidity is 59%. With an average temperature of 10°C (50°F), this humidity feels like a cool, brisk embrace, making it refreshing for outdoor activities but also necessitating layers to stay comfortable while exploring.

September Average Humidity in Altan

This chart illustrates the average monthly humidity levels in Altan, 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 Altan is approximately 59%, 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 Altan

In Altan in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Altan.

Maximum UV Index Levels in Altan for September

The chart shows the monthly maximum UV Index (UVI) for Altan 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 Altan typically reaches 7, which falls under the high exposure category.

Data source: Altan 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 Altan Compares to Other Months

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

This table compares monthly weather conditions in Altan, 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)	98%	low
February Weather	-18°C (1°F)	5 mm (0.2 inches)	94%	moderate
March Weather	-7°C (20°F)	6 mm (0.2 inches)	88%	moderate
April Weather	4°C (40°F)	11 mm (0.4 inches)	74%	high
May Weather	11°C (52°F)	12 mm (0.5 inches)	50%	very high
June Weather	17°C (63°F)	21 mm (0.8 inches)	48%	very high
July Weather	19°C (66°F)	48 mm (1.9 inches)	49%	very high
August Weather	16°C (61°F)	43 mm (1.7 inches)	54%	very high
September Weather	10°C (50°F)	15 mm (0.6 inches)	59%	high
October Weather	0°C (32°F)	12 mm (0.5 inches)	67%	moderate
November Weather	-10°C (14°F)	6 mm (0.2 inches)	86%	low
December Weather	-20°C (-4°F)	4 mm (0.1 inches)	96%	low