September weather forecast
Ulaanbaatar, Mongolia

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The valley city of Ulaanbaatar in Mongolia, with the distant view of the mountain ranges
The valley city of Ulaanbaatar in Mongolia, with the distant view of the mountain ranges

Weather in September

September ushers in autumn in Ulaanbaatar, manifesting a perceptible cooling trend. While the daily sunshine duration barely changes, the shorter daylight hours herald the incoming fall season. Settling between 3.6°C (38.5°F) and 16.7°C (62.1°F), temperatures begin to feel the chill of autumn. The rainfall drops drastically to 27mm (1.06"), marking the beginning of the dry season. As autumn unravels, participants in outdoor activities should carry a light jacket or a sweater.

Temperature

Stepping into September, Ulaanbaatar observes a temperature decline, with the average high falling from August's agreeable 22.3°C (72.1°F) to a comfortable 16.7°C (62.1°F). Ulaanbaatar logs a considerable temperature decrease from the daytime highs during the nights in September, with an average reading of 3.6°C (38.5°F).

Humidity

In Ulaanbaatar, the average relative humidity in September is 59%.

Rainfall

In Ulaanbaatar, Mongolia, in September, it is raining for 8 days, with typically 27mm (1.06") of accumulated precipitation. In Ulaanbaatar, during the entire year, the rain falls for 62.7 days and collects up to 267mm (10.51") of precipitation.

Snowfall

January through December are months with snowfall in Ulaanbaatar. In Ulaanbaatar, Mongolia, during September, snow falls for 2 days. Throughout the year, in Ulaanbaatar, Mongolia, there are 58.9 snowfall days.

Daylight

In Ulaanbaatar, the average length of the day in September is 12h and 35min.
On the first day of September, sunrise is at 06:10 and sunset at 19:33. On the last day of the month, sunrise is at 06:50 and sunset at 18:34 +08.

Sunshine

The average sunshine in September is 8.2h.

UV index

The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for average individuals.
Note: The maximum daily UV index of 5 in September interprets into the following recommendations:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Heed this! Snow reflection can almost augment the UV radiation of the sun by double.

Frequently asked questions

What are the temperatures in Ulaanbaatar in September?

During September, Ulaanbaatar experiences an average high-temperature of 16.7°C (62.1°F) and a low-temperature of 3.6°C (38.5°F).

What is the average humidity in September in Ulaanbaatar?

The average relative humidity in September is 59%.

How many days does it rain in September in Ulaanbaatar?

In September, the rain falls for 8 days. Throughout September, 27mm (1.06") of precipitation is accumulated.

How many days does it snow in September in Ulaanbaatar?

In Ulaanbaatar, during September, snow falls for 2 days.

What is the average length of the day in September in Ulaanbaatar?

The average day length in September in Ulaanbaatar, Mongolia, is 12h and 35min.

What time are sunrise and sunset in September in Ulaanbaatar?

In September, on the first day of the month, sunrise is at 06:10 and sunset at 19:33. On the last day of the month, sunrise is at 06:50 and sunset at 18:34 +08.

How many hours of sunshine does Ulaanbaatar have in September?

In Ulaanbaatar, the average sunshine duration in September is 8.2h.

What is the UV index reading in September in Ulaanbaatar?

The average daily maximum UV index in September in Ulaanbaatar is 5. A UV Index reading of 3 to 5 represents a medium hazard to health from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average UV index

Average temperature in September
Ulaanbaatar, Mongolia

Average temperature in September - Ulaanbaatar, Mongolia
  • Average high temperature in September: 16.7°C

The warmest month (with the highest average high temperature) is July (24.5°C).
The month with the lowest average high temperature is January (-15.6°C).

  • Average low temperature in September: 3.6°C

The month with the highest average low temperature is July (12.9°C).
The coldest month (with the lowest average low temperature) is January (-25.9°C).

Average humidity in September
Ulaanbaatar, Mongolia

Average humidity in September - Ulaanbaatar, Mongolia
  • Average humidity in September: 59%

The months with the highest relative humidity are January and December (78%).
The month with the lowest relative humidity is May (46%).

Average rainfall in September
Ulaanbaatar, Mongolia

Average rainfall in September - Ulaanbaatar, Mongolia
  • Average rainfall in September: 27mm

The wettest month (with the highest rainfall) is August (70mm).
The driest month (with the least rainfall) is January (2mm).

Average rainfall days in September
Ulaanbaatar, Mongolia

Average rainfall days in September - Ulaanbaatar, Mongolia
  • Average rainfall days in September: 8 days

The month with the highest number of rainy days is July (16 days).
The month with the least rainy days is February (0 days).

Average snowfall days in September
Ulaanbaatar, Mongolia

Average snowfall days in September - Ulaanbaatar, Mongolia
  • Average snowfall days in September: 2 days

The month with the highest number of snowfall days is December (10 days).
The month with the least snowfall days is July (0.2 days).

Average daylight in September /
Average sunshine in September
Ulaanbaatar, Mongolia

Average daylight in September / Average sunshine in September - Ulaanbaatar, Mongolia
  • Average daylight in September: 12h and 4min

The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 30min).

  • Average sunshine in September: 8h and 1min

The month with the most sunshine is May (Average sunshine: 9h and 42min).
The month with the least sunshine is December (Average sunshine: 5h and 0min).

Average UV index in September
Ulaanbaatar, Mongolia

Average UV index in September - Ulaanbaatar, Mongolia
  • Average UV index in September: 5

The months with the highest UV index are June and July (UV index 8).
The months with the lowest UV index are January, November and December (UV index 1).

Ulaanbaatar, Mongolia

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