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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 -18 °C (-1 °F) and 23 °C (73 °F) through the year, but rarely can drop to -36 °C (-33 °F) or can rise to as high as 37 °C (100 °F). The average annual precipitation amounts to about 161 mm (6.3 inches) and receives 31 rainy days on the 1 mm (0.04 inches) threshold annually. Bayan enjoys an average of 3675 hours of sunshine throughout the year, and daylight varies from 8 hours 39 minutes to 15 hours 42 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 19 to 23 °C (67 - 73 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -18 to -14 °C (-1 - 7 °F) throughout the day. On average each year, Bayan experiences 60 days above 25 °C (77.0 °F) and 181 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
Maximum-1°C
(31°F)		6°C
(43°F)		20°C
(68°F)		30°C
(86°F)		35°C
(96°F)		36°C
(97°F)		37°C
(100°F)		34°C
(94°F)		31°C
(89°F)		29°C
(84°F)		11°C
(53°F)		3°C
(38°F)
Mean maximum-5°C
(23°F)		2°C
(37°F)		15°C
(60°F)		25°C
(77°F)		32°C
(89°F)		32°C
(90°F)		35°C
(95°F)		32°C
(90°F)		28°C
(82°F)		21°C
(70°F)		9°C
(49°F)		-2°C
(29°F)
Average high-13°C
(9°F)		-7°C
(19°F)		4°C
(40°F)		13°C
(56°F)		20°C
(69°F)		26°C
(79°F)		28°C
(83°F)		24°C
(76°F)		20°C
(69°F)		10°C
(50°F)		-2°C
(29°F)		-11°C
(12°F)
Daily mean-18°C
(-1°F)		-14°C
(7°F)		-3°C
(27°F)		6°C
(43°F)		14°C
(57°F)		20°C
(69°F)		23°C
(73°F)		19°C
(67°F)		14°C
(57°F)		3°C
(37°F)		-8°C
(18°F)		-17°C
(2°F)
Average low-23°C
(-9°F)		-20°C
(-3°F)		-9°C
(16°F)		-1°C
(31°F)		6°C
(43°F)		13°C
(56°F)		17°C
(63°F)		14°C
(57°F)		8°C
(46°F)		-3°C
(28°F)		-12°C
(10°F)		-21°C
(-5°F)
Mean minimum-30°C
(-22°F)		-28°C
(-17°F)		-18°C
(0°F)		-8°C
(17°F)		-2°C
(28°F)		6°C
(43°F)		10°C
(51°F)		8°C
(47°F)		-1°C
(31°F)		-10°C
(15°F)		-22°C
(-6°F)		-29°C
(-19°F)
Minimum-36°C
(-33°F)		-33°C
(-26°F)		-22°C
(-8°F)		-11°C
(13°F)		-5°C
(22°F)		3°C
(37°F)		9°C
(49°F)		4°C
(39°F)		-5°C
(23°F)		-11°C
(12°F)		-24°C
(-10°F)		-32°C
(-25°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 6 rainy days and 35 mm (1.4 inches) of precipitation per month. The driest months in Bayan are January, February and December. On average, 2 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)2 (0.1)3 (0.1)6 (0.3)13 (0.5)18 (0.7)36 (1.4)51 (2.0)16 (0.6)7 (0.3)5 (0.2)2 (0.1)
Average precipitation days (≥ 1 mm)000234884110

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 51 minutes a day. Least sunny months in Bayan: January, November and December receive an average of 7 hours 54 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 hours211269319325359362369343309289259256
Mean daily daylight hours9h 3m10h 19m11h 55m13h 34m14h 58m15h 42m15h 20m14h 5m12h 30m10h 52m9h 25m8h 39m

Solar UV radiation in Bayan, Mongolia

Bayan experiences the highest level of ultraviolet (UV) radiation in May, June and August, when the maximum UV index can reach values of 9 - 10, 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)2357910997522