Ulaanbaatar, Mongolia Climate & Monthly Averages

The climate of Ulaanbaatar

Cold is the baseline in Ulaanbaatar, not the exception. Night-time lows sit at or below freezing in 7 months of the year, and the warmest month, July, still only averages 76°F (25°C) by day. January runs to -10°F (-24°C) after dark.

Climate quick facts

• Hottest month: July - highs near 76°F (25°C)
• Coldest month: January - highs near 10°F (-12°C)
• Decade extremes (2015-2024): 100°F (38°C) high · -42°F (-41°C) low
• Wettest month: August (12 rainy days) · Sunniest: June (12.1 h sun/day)
• Climate type: humid continental
• Annual swing: 37°C between the average warmest and coolest month · day to night: 12°C
• Snow: about 15 days a year
• Months with freezing average lows: 7
• Average humidity: 58%

Temperatures through the year

January sits at the other end of the year: 10°F (-12°C) by day, -10°F (-24°C) at night. At its warmest, in July, Ulaanbaatar runs to 76°F (25°C) in the afternoon and back to 56°F (13°C) by dawn. Relative humidity averages 58% across the year, drier than about 88% of the cities we track.

Rain, sun and snow

Days and nights are about 12°C apart on average - wider than roughly 87% of the cities we track. 7 months average under 20 mm of rain, the longest unbroken stretch running October through April. The wettest month is August (3.5 inches (90 mm) across 12 days) and the driest January. The gridded 2015-2024 daily record for this location tops out at 100°F (38°C) and bottoms at -42°F (-41°C) - decade extremes, not all-time station records.

How Ulaanbaatar compares

• Ulaanbaatar averages 34°F (1°C) across the year - cooler than almost every other city we track.
• Its warmest and coolest months are 37°C apart - a wider seasonal swing than any other city in our 3496-city dataset.
• 64% of the year's precipitation falls in its wettest three months - more seasonal than 94% of the 3496 cities we track.

Ranked against every city in our dataset, each measured on the same ten-year window.

Best time to visit Ulaanbaatar

May to June and August to September is the sweet spot for Ulaanbaatar - these are the warmest and brightest weeks of the year. Expect 67°F (19°C) in the afternoon and around 9 days of rain in a typical month of it. For the same question asked the other way round, see where else is warm in May.

Pack for Ulaanbaatar with a heavy insulated coat, hat and gloves for winter and rain gear if you travel around August. Note the gap between afternoon and night: July pairs 76°F (25°C) with 56°F (13°C).