Ulaanbaatar
Mongolia
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Ulaanbaatar, Mongolia

The valley city of Ulaanbaatar in Mongolia, viewed from above, with the distant view of the mountain ranges
The valley city of Ulaanbaatar in Mongolia, viewed from above, with the distant view of the mountain ranges
September, the first month of the autumn, in Ulaanbaatar, is still a comfortable month, with average temperature varying between 16.7°C (62.1°F) and 0°C (32°F).

Temperature

In September, the average high-temperature decreases, from an agreeable 22.3°C (72.1°F) in August, to an enjoyable 16.7°C (62.1°F). In September, the average low-temperature is 0°C (32°F).

Humidity

In Ulaanbaatar, the average relative humidity is 59%.

Rainfall

In Ulaanbaatar, in September, during 8 rainfall days, 27mm (1.06") of precipitation is typically accumulated. Throughout the year, in Ulaanbaatar, there are 62.7 rainfall days, and 267mm (10.51") of precipitation is accumulated.

Snowfall

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

Daylight

In September, the average length of the day in Ulaanbaatar is 12.6h.

Sunshine

In Ulaanbaatar, the average sunshine is 8.2h.

UV index

The average daily maximum UV index in Ulaanbaatar is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to the UV radiation for the average person.
Note: The average daily UV index of 5 in September transform into the following instructions:
Take precautions - Protection against the skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in September in Ulaanbaatar?

In September, the average high-temperature is 16.7°C (62.1°F), and the average low-temperature is 0°C (32°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 Ulaanbaatar, Mongolia, in September, during 8 rainfall days, 27mm (1.06") of precipitation is typically accumulated.

How many days does it snow in September in Ulaanbaatar?

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

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

In September, the average length of the day is 12.6h.

How long on average sun shines in September in Ulaanbaatar?

The average sunshine in September is 8.2h.

How high is the UV index in September in Ulaanbaatar?

The average daily maximum UV index in September in Ulaanbaatar, Mongolia, is 5. A UV Index of 3 to 5 symbolizes a medium health risk from the exposure to the Sun's UV rays.
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: 0°C

Months with the highest average low temperature are January, February, March, April, May, June, July, August, September, October, November and December (0°C).
Coldest months (with the lowest average low temperature) are January, February, March, April, May, June, July, August, September, October, November and December (0°C).

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

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: 27mm

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

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 lowest number of rainy days is February (0 days).

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 lowest number of snowfall days is July (0.2 days).

Average daylight in September / Average sunshine in September - Ulaanbaatar, Mongolia
  • Average daylight in September: 12.6h

The month with the longest days is June (Average daylight: 16h).
The month with shortest days is December (Average daylight: 8.5h).

  • Average sunshine in September: 8.2h

The month with most sunshine is May (Average sunshine: 9.7h).
The month with least sunshine is December (Average sunshine: 5h).

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

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