Click on a day for an hourly weather forecast
The weather in Mongolia 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 Mongolia 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 Mongolia during September. It’s important to get out your snow boots and warm mittens to stay warm while you explore Mongolia.
Our weather forecast can give you a great sense of what weather to expect in Mongolia in September 2025.
If you’re planning to visit Mongolia in the near future, we highly recommend that you review the 14 day weather forecast for Mongolia before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -17° / -26° | 1 | 21 | 9 | 3 mm | Awful | Mongolia in January |
| February | -14° / -25° | 3 | 17 | 9 | 6 mm | Awful | Mongolia in February |
| March | -5° / -15° | 4 | 16 | 11 | 15 mm | Awful | Mongolia in March |
| April | 6° / -3° | 4 | 18 | 9 | 26 mm | Awful | Mongolia in April |
| May | 13° / 3° | 4 | 21 | 6 | 47 mm | Bad | Mongolia in May |
| June | 20° / 10° | 8 | 21 | 1 | 84 mm | Ok | Mongolia in June |
| July | 22° / 13° | 8 | 23 | 0 | 114 mm | Ok | Mongolia in July |
| August | 20° / 10° | 8 | 23 | 0 | 99 mm | Ok | Mongolia in August |
| September | 13° / 4° | 4 | 23 | 3 | 46 mm | Bad | Mongolia in September |
| October | 3° / -4° | 3 | 20 | 8 | 19 mm | Awful | Mongolia in October |
| November | -8° / -16° | 3 | 16 | 11 | 13 mm | Awful | Mongolia in November |
| December | -15° / -24° | 2 | 19 | 10 | 4 mm | Awful | Mongolia in December |