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Monthly climate in Si'an, China

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Si'an features a humid subtropical climate (Cfa). Temperatures typically range between 5 °C (41 °F) and 28 °C (84 °F) through the year, but rarely can drop to -8 °C (17 °F) or can rise to as high as 39 °C (103 °F). The average annual precipitation amounts to about 1189 mm (46.8 inches) and receives 116 rainy days on the 1 mm (0.04 inches) threshold annually. Si'an enjoys an average of 3031 hours of sunshine throughout the year, and daylight varies from 10 hours 4 minutes to 14 hours 12 minutes per day.

Monthly average temperatures in Si'an, China

The warmest months in Si'an are July, August and September, with daily mean temperatures ranging from 24 to 28 °C (76 - 84 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 5 to 7 °C (41 - 45 °F) throughout the day. On average each year, Si'an experiences 121 days above 25 °C (77.0 °F) and 21 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Si'an. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum18°C
(64°F)		24°C
(75°F)		27°C
(81°F)		30°C
(87°F)		35°C
(95°F)		37°C
(99°F)		39°C
(103°F)		37°C
(99°F)		34°C
(94°F)		32°C
(90°F)		27°C
(81°F)		20°C
(68°F)
Mean maximum14°C
(58°F)		19°C
(66°F)		24°C
(76°F)		28°C
(82°F)		32°C
(90°F)		33°C
(92°F)		36°C
(97°F)		35°C
(95°F)		32°C
(91°F)		28°C
(84°F)		24°C
(75°F)		17°C
(64°F)
Average high8°C
(47°F)		10°C
(50°F)		15°C
(59°F)		20°C
(68°F)		25°C
(77°F)		28°C
(83°F)		31°C
(88°F)		32°C
(89°F)		28°C
(82°F)		22°C
(72°F)		17°C
(64°F)		11°C
(52°F)
Daily mean5°C
(41°F)		6°C
(43°F)		11°C
(51°F)		15°C
(59°F)		21°C
(69°F)		24°C
(76°F)		28°C
(82°F)		28°C
(84°F)		24°C
(76°F)		19°C
(66°F)		13°C
(56°F)		7°C
(45°F)
Average low2°C
(36°F)		2°C
(36°F)		7°C
(45°F)		11°C
(52°F)		16°C
(62°F)		21°C
(70°F)		25°C
(78°F)		26°C
(79°F)		22°C
(71°F)		15°C
(60°F)		10°C
(50°F)		3°C
(38°F)
Mean minimum-5°C
(23°F)		-3°C
(27°F)		2°C
(35°F)		5°C
(41°F)		11°C
(53°F)		18°C
(64°F)		22°C
(71°F)		23°C
(73°F)		17°C
(64°F)		9°C
(49°F)		3°C
(38°F)		-4°C
(25°F)
Minimum-8°C
(17°F)		-5°C
(23°F)		0°C
(33°F)		4°C
(39°F)		9°C
(49°F)		16°C
(61°F)		18°C
(65°F)		21°C
(71°F)		16°C
(61°F)		8°C
(47°F)		1°C
(34°F)		-7°C
(20°F)

Compare climate in Si'an with other places

Compare temperature, precipitation, sunshine, UV index in Si'an, China with other places around the world.

Monthly average precipitation in Si'an, China

Si'an usually has the most precipitation in July, August and September, with an average of 14 rainy days and 188 mm (7.4 inches) of precipitation per month. The driest months in Si'an are January, February and December. On average, 48 mm (1.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Si'an. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)47 (1.8)52 (2.0)56 (2.2)70 (2.8)112 (4.4)131 (5.2)231 (9.1)192 (7.6)142 (5.6)58 (2.3)53 (2.1)44 (1.7)
Average precipitation days (≥ 1 mm)8898910171411778

Monthly sunshine hours in Si'an, China

The sunniest months in Si'an are May, June and August, when the sun shines an average of 9 hours 35 minutes a day. Least sunny months in Si'an: January, February and December receive an average of 6 hours 38 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Si'an. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours166217254264288286286307268246225219
Mean daily daylight hours10h 17m11h 1m11h 59m12h 57m13h 47m14h 12m13h 59m13h 16m12h 20m11h 21m10h 30m10h 4m

Solar UV radiation in Si'an, China

Si'an experiences the highest level of ultraviolet (UV) radiation in April, July and August, when the maximum UV index can reach values of 10 - 11, which corresponds to the Very High / Extreme category of sun exposure. January, February and December are in the Moderate / High exposure category. In these months, the maximum values of the UV index do not exceed 6. For more detailed information, check out our hourly Si'an UV Index data.

Average daily maximum UV levels by month for Si'an. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)468101010111110864