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Monthly climate in Ulan Bator, Mongolia

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Ulan Bator features a cold semi-arid climate (BSk). Temperatures typically range between -22 °C (-8 °F) and 17 °C (64 °F) through the year, but rarely can drop to -42 °C (-44 °F) or can rise to as high as 32 °C (91 °F). The average annual precipitation amounts to about 339 mm (13.4 inches) and receives 58 rainy days on the 1 mm (0.04 inches) threshold annually. Ulan Bator enjoys an average of 3709 hours of sunshine throughout the year, and daylight varies from 8 hours 26 minutes to 15 hours 56 minutes per day.

Monthly average temperatures in Ulan Bator, Mongolia

The warmest months in Ulan Bator are June, July and August, with daily mean temperatures ranging from 14 to 17 °C (58 - 64 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -22 to -18 °C (-8 - 0 °F) throughout the day. On average each year, Ulan Bator experiences 17 days above 25 °C (77.0 °F) and 210 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Ulan Bator. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum-5°C
(23°F)		4°C
(39°F)		16°C
(61°F)		25°C
(77°F)		30°C
(87°F)		32°C
(90°F)		32°C
(91°F)		28°C
(82°F)		27°C
(81°F)		22°C
(72°F)		9°C
(49°F)		-3°C
(28°F)
Mean maximum-8°C
(18°F)		-1°C
(30°F)		11°C
(52°F)		20°C
(69°F)		27°C
(81°F)		28°C
(83°F)		30°C
(86°F)		26°C
(79°F)		23°C
(74°F)		15°C
(60°F)		7°C
(45°F)		-7°C
(20°F)
Average high-16°C
(4°F)		-11°C
(12°F)		0°C
(33°F)		9°C
(48°F)		15°C
(60°F)		21°C
(70°F)		23°C
(73°F)		20°C
(67°F)		15°C
(60°F)		5°C
(42°F)		-6°C
(22°F)		-15°C
(5°F)
Daily mean-22°C
(-8°F)		-18°C
(-0°F)		-7°C
(20°F)		2°C
(36°F)		9°C
(48°F)		15°C
(59°F)		17°C
(64°F)		14°C
(58°F)		9°C
(48°F)		-1°C
(30°F)		-12°C
(11°F)		-21°C
(-5°F)
Average low-28°C
(-18°F)		-25°C
(-12°F)		-14°C
(7°F)		-4°C
(25°F)		1°C
(35°F)		8°C
(47°F)		12°C
(54°F)		10°C
(50°F)		3°C
(38°F)		-7°C
(20°F)		-17°C
(2°F)		-26°C
(-14°F)
Mean minimum-36°C
(-33°F)		-33°C
(-27°F)		-24°C
(-12°F)		-13°C
(9°F)		-6°C
(21°F)		1°C
(34°F)		7°C
(45°F)		4°C
(39°F)		-5°C
(23°F)		-13°C
(8°F)		-28°C
(-19°F)		-36°C
(-32°F)
Minimum-42°C
(-44°F)		-38°C
(-36°F)		-29°C
(-20°F)		-16°C
(4°F)		-8°C
(18°F)		-3°C
(28°F)		5°C
(41°F)		0°C
(33°F)		-9°C
(16°F)		-16°C
(4°F)		-35°C
(-32°F)		-39°C
(-38°F)

Compare climate in Ulan Bator with other places

Compare temperature, precipitation, sunshine, UV index in Ulan Bator, Mongolia with other places around the world.

Monthly average precipitation in Ulan Bator, Mongolia

Ulan Bator usually has the most precipitation in July, August and September, with an average of 11 rainy days and 69 mm (2.7 inches) of precipitation per month. The driest months in Ulan Bator are January, February and December. On average, 3 mm (0.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Ulan Bator. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)2 (0.1)5 (0.2)7 (0.3)15 (0.6)26 (1.0)44 (1.7)72 (2.9)83 (3.3)51 (2.0)21 (0.8)10 (0.4)3 (0.1)
Average precipitation days (≥ 1 mm)01245712138420

Monthly sunshine hours in Ulan Bator, Mongolia

The sunniest months in Ulan Bator are May, June and July, when the sun shines an average of 12 hours 8 minutes a day. Least sunny months in Ulan Bator: January, November and December receive an average of 7 hours 47 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Ulan Bator. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours202265327333375368372345310294262250
Mean daily daylight hours8h 51m10h 12m11h 54m13h 39m15h 9m15h 56m15h 32m14h 12m12h 32m10h 48m9h 15m8h 26m

Solar UV radiation in Ulan Bator, Mongolia

Ulan Bator experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 9 - 9, which corresponds to the Very High category of sun exposure. January, February and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 3. For more detailed information, check out our hourly Ulan Bator UV Index data.

Average daily maximum UV levels by month for Ulan Bator. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)235799996431