Ulaanbaatar in January

−20 to −30 °C (−4 to −22 °F), smog; Tsagaan Sar closures some years.−4 to −22 °F (−20 to −30 °C), smog; Tsagaan Sar closures some years.

All twelve months in one grid — weather, crowds and prices, with gaps left as unknown.

January is rated avoid. These months rate higher:

• JuneGreatWarm, long days; camps open.
• SeptemberGreatClear and cool; good month.
• MayGoodCool and dry; camps start to open.
• AugustGoodWarm; green countryside.

• UlaanbaatarHighs around -16 °C (3 °F), lows around -26 °C (−15 °F), rain on about 1 dayHighs around 3 °F (-16 °C), lows around −15 °F (-26 °C), rain on about 1 day
• Ulaanbaatar and the centre, Mongolia · Ulaanbaatar, Terelj, Kharkhorin, Orkhon valleysmoke haze

  Coldest capital in the world: January averages about −20 °C (−4 °F). Coal and ger-stove smoke make winter air among the worst anywhere Nov–Feb. Summer is 20–28 °C (68–82 °F) by day with afternoon showers in July–August.Coldest capital in the world: January averages about −4 °F (−20 °C). Coal and ger-stove smoke make winter air among the worst anywhere Nov–Feb. Summer is 68–82 °F (20–28 °C) by day with afternoon showers in July–August.

Dates as our data lists them. Moving holidays (lunar and Islamic calendars, Easter) shift every year: check the date for your year before you build a trip on it.

• New Year

  Dec 31–Jan 1

  Fireworks and lights on the square in deep cold; restaurants book out.

• Tsagaan Sar (Lunar New Year) big impact

  Feb 2027 (lunar, moves yearly — check) · Mongolia

  Three official days, but many shops and restaurants close for a week; families visit elders, transport out of the city is packed.

Crowds · Mongolia overall

Low

Prices · Mongolia overall

Low

Mongolia overall: −20 to −30 °C and the worst smog of the year in Ulaanbaatar; city museums only.

Weather, crowds and prices for any two months in Ulaanbaatar, side by side.

• A warm coat, hat and gloves for mornings and evenings

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