Ulaanbaatar Weather in September

September is the beginning of autumn season in Ulaanbaatar, characterized by lowering temperature, enlarged daily temperature difference and decreasing precipitation. But it is not too cold yet and enjoys plenty of sunshine and ample daytime. In other words, Ulaanbaatar weather in September is moderately cool and predominantly sunny. Besides, stunning autumn scenery can be seen during this time.

Getting Cool with Enlarged Day-Night Temperature Difference

High Temperature: mostly ranging from 9 to 22 degrees Celsius (48 - 72 degrees Fahrenheit)
Low Temperature: -1 to 8℃ (30 - 46℉)

Throughout the whole September, the temperature shows a declining trend, so the climate of Ulaanbaatar in September turns cool gradually. In the first half, there remains lingering heat from summer when the high temperature might go over 22℃ (72℉); while entering into late September, it keeps around 15℃ (59℉) or lower.

The day-night temperature difference is enlarged, normally no less than 10℃ (50℉), even reaching 16℃ (61℉) sometimes.

Also, sudden and large temperature drop occurs when it rains, snows or blows heavily. It feels like the season has changed from autumn to winter only in a few days.

Low Precipitation

With the end of rainy season, the precipitation in September sees a significant drop to 42mm (1.65 in) distributed over 9 days on average. Light and short-time rainfall is the main form and heavy rain is rarely seen. 1-2 snowy days are possible in late September. However, it snows so lightly that there leaves almost no snow cover on the ground.

Though the average humidity of 67% is not low, the perceived air remains pretty dry especially when the heating system starts to function on September 15. Therefore, it is suggested to pack facial and body cream to keep your skin moisturized.

Plenty of Sunshine

The sun doesn’t rise until 06:22 - 07:00 and sets early at 18:49 - 19:46, so there are enough daylight hours for visitors to travel around. But the daytime in early September and late September is largely different, shortening from 13h24m to 11h48m. You had better make reasonable travel plans accordingly to make full use of the daylight hours.

What’s more, sunny and cloudy days dominate Ulaanbaatar in September, even reaching about 20 days. That means it receives plenty of sunshine, with the average sunny hours of 8 per day. In other words, Ulaanbaatar weather in September is predominantly sunny. The sunlight becomes less strong with a moderate UV index of 5, but still warm and bright enough for beautiful photos.

Averages for Ulaanbaatar Weather in September

High Temperature

17°C (62.6°F)

Low Temperature

1°C (33.8°F)

Rainfall

42 mm

Sunrise

06:22 ~ 07:00

Sunset

18:49 ~ 19:46

Jan.Feb.Mar.Apr.May.Jun.Jul.Aug.Sep.Oct.Nov.Dec.

The times for sunrise and sunset are based on Ulaanbaatar.

Is September a Good Time to Visit Ulaanbaatar?

Surely yes! September is certainly one of the best months for an Ulaanbaatar trip for the following reasons.

The climate of Ulaanbaatar in September is pleasantly cool most of the time, suitable for outdoor explorations. Low rainfall, bright sunshine together with abundant daytime also create a favorable weather condition for traveling to Ulaanbaatar. Meanwhile, you can enjoy colorful autumn scenery in September when the trees and grasslands start to turn yellow. Besides, it is the low tourist season in Ulaanbaatar, so the hotel is more easily available and in lower prices. The same is true for the tickets of flights and attractions.

Best Places to Appreciate Autumn Scenery in Ulaanbaatar

Terelj National Park

Terelj National Park is the most recommended attraction for visitors to enjoy gorgeous autumn scenery. About 80km (49 mi) away from the downtown, it takes one or two hours by car to arrive there. Under the bule sky dotted with white clouds, the forests transit from green to yellow and red bushes are scattered on the mountains, presenting a colorful picture to feast visitors’ eyes.

Tuul River

Tuul River is also a good destination if your time is limited. Known as the “Mother River” of Ulaanbaatar, it lies in the urban area and goes across the whole city. In September, trees on both banks are tinged with different levels of green and yellow. Wandering along the riverside accompanied by gurgling water, you can clearly see the inverted reflections of the sky, golden trees as well as distant mountains.

What to Wear in Ulaanbaatar in September?

Upper body: It is suggested to wear long-sleeve T-shirts and jackets in early September and then put on hoodies and sweaters in middle September. Entering into the last week, shirts with cotton coats or woolen coats are good matches.

Lower body: Normal long trousers like jeans and sweatpants alone are able to deal with the temperature in the first half of the month. For the second half, you had better put on long johns beneath or change them into fleece-lined ones.

Shoes: Comfortable casual shoes like sneakers work well to keep warm, but remember to prepare thick socks to prevent sudden temperature drops.

Others: Though the UV index is not high, you are still suggested to take some sunscreen measures, for example wearing hats and sunglasses to prevent the bright sunshine. You should also prepare scarves and masks in case the temperature drops significantly.

Tips for Visiting Ulaanbaatar in September

1. Since September 15, majority of attractions get closed at 17:00, 3 hours earlier than before since they start to follow the winter time schedule. Further check the opening time and arrange your visit plan accordingly to ensure enough visit time at these scenic spots.
2. The grassland and forest turn almost totally yellow and golden with only a hint of green in late September. If you prefer the autumn view mingled with yellow and green, visit Ulaanbaatar during the first half of the month.
3. The heating system starts to work on September 15. At the initial stage the indoor temperature might be not high enough and you still need to wear thick clothes indoors. By late September when the heating system works more efficiently while the outdoor temperature keeps dropping, which means indoor-outdoor temperature difference is so significant, you had better wear relatively thin inner layer and thicker outer coats and adjust the clothing timely in case of catching a cold.

7-Day Ulaanbaatar Weather Forecast