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Monthly climate in Bayan, Mongolia

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Bayan features a cold semi-arid climate (BSk). Temperatures typically range between -19 °C (-3 °F) and 21 °C (71 °F) through the year, but rarely can drop to -36 °C (-32 °F) or can rise to as high as 37 °C (98 °F). The average annual precipitation amounts to about 316 mm (12.4 inches) and receives 53 rainy days on the 1 mm (0.04 inches) threshold annually. Bayan enjoys an average of 3601 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 Bayan, Mongolia

The warmest months in Bayan are June, July and August, with daily mean temperatures ranging from 18 to 21 °C (64 - 71 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -19 to -16 °C (-3 - 3 °F) throughout the day. On average each year, Bayan experiences 48 days above 25 °C (77.0 °F) and 187 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Bayan. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum1°C
(34°F)		5°C
(41°F)		22°C
(71°F)		31°C
(87°F)		35°C
(95°F)		36°C
(98°F)		37°C
(98°F)		34°C
(93°F)		32°C
(90°F)		25°C
(77°F)		12°C
(53°F)		3°C
(37°F)
Mean maximum-5°C
(23°F)		1°C
(33°F)		16°C
(60°F)		26°C
(79°F)		32°C
(90°F)		32°C
(90°F)		34°C
(94°F)		30°C
(87°F)		27°C
(81°F)		20°C
(68°F)		10°C
(51°F)		-2°C
(28°F)
Average high-14°C
(8°F)		-9°C
(16°F)		2°C
(37°F)		12°C
(54°F)		19°C
(67°F)		25°C
(77°F)		27°C
(81°F)		23°C
(73°F)		19°C
(67°F)		9°C
(49°F)		-3°C
(28°F)		-12°C
(11°F)
Daily mean-19°C
(-3°F)		-16°C
(3°F)		-5°C
(24°F)		5°C
(41°F)		13°C
(55°F)		19°C
(66°F)		21°C
(71°F)		18°C
(64°F)		13°C
(55°F)		2°C
(37°F)		-8°C
(17°F)		-17°C
(2°F)
Average low-24°C
(-11°F)		-22°C
(-7°F)		-11°C
(12°F)		-2°C
(28°F)		5°C
(42°F)		12°C
(54°F)		16°C
(60°F)		13°C
(55°F)		6°C
(44°F)		-3°C
(27°F)		-13°C
(9°F)		-21°C
(-5°F)
Mean minimum-31°C
(-24°F)		-32°C
(-25°F)		-20°C
(-4°F)		-9°C
(16°F)		-3°C
(27°F)		5°C
(42°F)		10°C
(51°F)		6°C
(43°F)		-1°C
(31°F)		-9°C
(16°F)		-23°C
(-10°F)		-30°C
(-21°F)
Minimum-35°C
(-31°F)		-35°C
(-31°F)		-24°C
(-11°F)		-11°C
(13°F)		-5°C
(24°F)		3°C
(37°F)		8°C
(47°F)		-1°C
(30°F)		-5°C
(24°F)		-11°C
(12°F)		-31°C
(-23°F)		-36°C
(-32°F)

Compare climate in Bayan with other places

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

Monthly average precipitation in Bayan, Mongolia

Bayan usually has the most precipitation in June, July and August, with an average of 10 rainy days and 65 mm (2.6 inches) of precipitation per month. The driest months in Bayan are January, February and December. On average, 4 mm (0.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Bayan. 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)6 (0.2)11 (0.4)25 (1.0)41 (1.6)74 (2.9)80 (3.1)39 (1.6)21 (0.8)8 (0.3)4 (0.1)
Average precipitation days (≥ 1 mm)01126612127321

Monthly sunshine hours in Bayan, Mongolia

The sunniest months in Bayan are May, June and July, when the sun shines an average of 11 hours 45 minutes a day. Least sunny months in Bayan: January, November and December receive an average of 7 hours 40 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Bayan. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours203263316324354360366324301283253249
Mean daily daylight hours8h 51m10h 12m11h 54m13h 39m15h 9m15h 56m15h 32m14h 12m12h 32m10h 48m9h 15m8h 26m

Solar UV radiation in Bayan, Mongolia

Bayan experiences the highest level of ultraviolet (UV) radiation in June, 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, November and December are in the Low exposure category. In these months, the maximum values of the UV index do not exceed 2. For more detailed information, check out our hourly Bayan UV Index data.

Average daily maximum UV levels by month for Bayan. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)235689996422