Ulaanbaatar weather in September
Temperature, rain and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Excellent
Best time to visit: May – September
What is the weather like in Ulaanbaatar in September?
In September, Ulaanbaatar is mild: daytime highs average 16 °C, and nights cool down to about 3 °C. The sun shines for around 8 hours a day. Rain falls on about 7 days, adding up to 36 mm. All in all, September is an excellent month for a holiday in Ulaanbaatar.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 84 | 83 | 44 |
| Day | 22° | 16° | 7° |
| Night | 10° | 3° | −4° |
| Sun | 9 h | 8 h | 7 h |
| Rain days | 11 | 7 | 4 |
More details for September
- Daylight
- 12 h 40 min06:28 – 19:08
- UV index
- 5 · moderateclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 16 km/haverage daily peakAll months
- Cloud cover
- 47 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 1 day1 cm or more of fresh snowAll months
- Time zone
- UTC+8Asia/Ulaanbaatar
How the score comes together
- Temperatureweight 50 %82 %
- Sunshineweight 20 %88 %
- Few rainy daysweight 30 %80 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Sunscreen
- Sunglasses & sun hat
- A jumper for the evenings
Ulaanbaatar in September: quick answers
Is Ulaanbaatar hot in September?
No. In September, Ulaanbaatar is mild: daytime highs average 16 °C and nights drop to about 3 °C.
Does it rain much in Ulaanbaatar in September?
Rain falls on about 7 days, adding up to 36 mm.
Ulaanbaatar month by month
The whole year in UlaanbaatarAll destinations: MongoliaWhere to go in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences