September
Best time
15.8°C / 4°C
14 rain days
cool, rainy
Best time to visit Ulaanbaatar
Ulaanbaatar, Mongolia — ranked month by month from data: temperature, rainfall, snow, and peak hazard seasons. The standouts: September, May.
Best · September & May
About Ulaanbaatar
Ulaanbaatar is the capital and largest city of Mongolia. It has a population of 1.79 million, and is the coldest capital city in the world by average yearly temperature. The municipality is located in north central Mongolia at an elevation of about 1,300 metres (4,300 ft) in a valley on the Tuul River.
— condensed from Wikipedia
Best months to visit
May
Best time
16.1°C / 2°C
14 rain days
mild, rainy
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OK — shoulder months
June
OK
22.3°C / 9.4°C
17 rain days
warm, very wet
- comfortable temperatures (avg high 22.3°C / 72°F)
April
OK
10.2°C / -2.7°C
11 rain days
cool, freezing nights, rainy
October
OK
6.7°C / -3.8°C
8 rain days
chilly, freezing nights
- manageable rain (8 days)
Months to skip
July
Skip
24.3°C / 12.8°C
19 rain days
warm, very wet
- extremely wet (19 rain days)
August
Skip
21.4°C / 10.2°C
19 rain days
mild, very wet
- extremely wet (19 rain days)
March
Skip
2.8°C / -9.6°C
7 rain days
cold, freezing nights
- bitterly cold (overnight -9.6°C)
November
Skip
-4.8°C / -14.3°C
8 rain days
cold, freezing nights
- bitterly cold (overnight -14.3°C)
February
Skip
-7.5°C / -19.7°C
3 rain days
cold, freezing nights, dry
- bitterly cold (overnight -19.7°C)
December
Skip
-11.6°C / -20.9°C
4 rain days
cold, freezing nights, dry
- bitterly cold (overnight -20.9°C)
January
Skip
-12.3°C / -23.6°C
2 rain days
cold, freezing nights, dry
- bitterly cold (overnight -23.6°C)
How we ranked these
Each month is scored on temperature comfort (18–27°C avg high is the sweet spot), rainfall (more rain days = lower score), snow days, and peak hazard seasons (hurricanes, monsoons, etc.). Green-tier months are within ideal range with no major issues. Yellow are workable but with trade-offs. Red has at least one significant problem — extreme heat or cold, heavy rain, or peak storm season.