Ulaanbaatar weather in September
September is one of the best months to visit Ulaanbaatar: highs of 15°C (58°F) and about 25 mm (1.0 in) of rain on average. Nights average 1°C (34°F) and cloud cover 46% (NASA POWER, 2001–2025 averages). It is the 5th wettest month of the year and the 5th warmest. Compared with August, it is cooler and drier; October brings highs of 4°C (40°F) and 11 mm (0.4 in) of rain.
Figures are long-term averages for Ulan Bator, the largest city in Ulaanbaatar. See below for other places.
Is September a good time to visit Ulaanbaatar?
best month Weather score 71/100.
Yes. September is one of the best months for weather in Ulaanbaatar.
Does it rain a lot in Ulaanbaatar in September?
No, it is usually dry: about 25 mm (1.0 in) falls in an average September. It is the 5th wettest month of the year.
How warm is Ulaanbaatar in September?
Days average 15°C (58°F) and nights 1°C (34°F).
Ulaanbaatar weather by month
| Month | High | Low | Rain | Cloud | Weather |
|---|---|---|---|---|---|
| January | -16°C (3°F) | -26°C (-14°F) | 3 mm | 43% | least pleasant |
| February | -12°C (10°F) | -24°C (-11°F) | 4 mm | 47% | least pleasant |
| March | -3°C (27°F) | -15°C (5°F) | 6 mm | 49% | least pleasant |
| April | 7°C (44°F) | -6°C (21°F) | 10 mm | 52% | least pleasant |
| May | 15°C (59°F) | 0°C (32°F) | 29 mm | 54% | fair |
| June | 22°C (72°F) | 8°C (46°F) | 48 mm | 61% | best |
| July | 24°C (75°F) | 11°C (51°F) | 68 mm | 61% | best |
| August | 21°C (71°F) | 8°C (47°F) | 61 mm | 55% | best |
| September | 15°C (58°F) | 1°C (34°F) | 25 mm | 46% | best |
| October | 4°C (40°F) | -7°C (20°F) | 11 mm | 45% | least pleasant |
| November | -7°C (20°F) | -16°C (3°F) | 8 mm | 51% | least pleasant |
| December | -15°C (6°F) | -23°C (-10°F) | 4 mm | 50% | least pleasant |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis). Page updated . How we rate months
Weather across Ulaanbaatar in September
Weather can differ a lot within Ulaanbaatar: coasts, hills and mountains each have their own climate.
| Place | High | Low | Rain | Weather |
|---|---|---|---|---|
| Ulan Bator | 15°C (58°F) | 1°C (34°F) | 25 mm | best |
| Nalayh | 14°C (56°F) | 0°C (32°F) | 26 mm | fair |