The weather in Ulaanbaatar in September is very cold with temperatures between 4°C and 13°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Ulaanbaatar during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
You can expect a few days of snow in Ulaanbaatar during September. It’s important to get out your snow boots and warm mittens to stay warm while you explore Ulaanbaatar.
Our weather forecast can give you a great sense of what weather to expect in Ulaanbaatar in September 2025.
If you’re planning to visit Ulaanbaatar in the near future, we highly recommend that you review the 14 day weather forecast for Ulaanbaatar before you arrive.
Temperatures
13° / 4°
Rainy Days
4
Snowy Days
3
Dry Days
23
Rainfall
46
mm
Sun Hours
11.4
Hrs
