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Monthly climate in Sion, Peru

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Sion features a tropical rainforest climate (Af). Temperatures typically range between 22 °C (72 °F) and 24 °C (76 °F) through the year, but rarely can drop to 13 °C (56 °F) or can rise to as high as 35 °C (96 °F). The average annual precipitation amounts to about 2224 mm (87.6 inches) and receives 246 rainy days on the 1 mm (0.04 inches) threshold annually. Sion enjoys an average of 3390 hours of sunshine throughout the year, and daylight varies from 11 hours 40 minutes to 12 hours 32 minutes per day.

Monthly average temperatures in Sion, Peru

The warmest months in Sion are September, October and November, with daily mean temperatures ranging from 24 to 24 °C (75 - 76 °F) throughout the day. The coldest temperatures usually occur in May, June and July, when daily mean temperatures range from 22 to 23 °C (72 - 73 °F) throughout the day. On average each year, Sion experiences 304 days above 25 °C (77.0 °F) and 0 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Sion. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum33°C
(92°F)		32°C
(90°F)		33°C
(91°F)		32°C
(89°F)		32°C
(90°F)		32°C
(90°F)		31°C
(88°F)		34°C
(94°F)		35°C
(95°F)		35°C
(96°F)		34°C
(93°F)		32°C
(90°F)
Mean maximum32°C
(89°F)		31°C
(89°F)		32°C
(90°F)		31°C
(88°F)		31°C
(88°F)		30°C
(87°F)		31°C
(87°F)		33°C
(92°F)		34°C
(93°F)		34°C
(93°F)		32°C
(90°F)		31°C
(89°F)
Average high28°C
(82°F)		28°C
(83°F)		28°C
(83°F)		28°C
(84°F)		28°C
(84°F)		28°C
(83°F)		28°C
(83°F)		30°C
(85°F)		31°C
(88°F)		30°C
(86°F)		29°C
(84°F)		28°C
(83°F)
Daily mean23°C
(74°F)		23°C
(74°F)		23°C
(73°F)		23°C
(74°F)		23°C
(73°F)		23°C
(73°F)		22°C
(72°F)		23°C
(74°F)		24°C
(76°F)		24°C
(76°F)		24°C
(75°F)		23°C
(74°F)
Average low19°C
(67°F)		20°C
(68°F)		19°C
(67°F)		19°C
(67°F)		19°C
(66°F)		18°C
(65°F)		17°C
(64°F)		18°C
(64°F)		19°C
(66°F)		19°C
(67°F)		20°C
(67°F)		20°C
(68°F)
Mean minimum18°C
(64°F)		18°C
(65°F)		18°C
(64°F)		17°C
(63°F)		16°C
(62°F)		16°C
(62°F)		15°C
(59°F)		15°C
(59°F)		17°C
(62°F)		17°C
(64°F)		18°C
(65°F)		18°C
(65°F)
Minimum17°C
(63°F)		17°C
(64°F)		16°C
(62°F)		15°C
(60°F)		16°C
(61°F)		15°C
(59°F)		14°C
(57°F)		13°C
(56°F)		16°C
(61°F)		16°C
(61°F)		18°C
(64°F)		17°C
(63°F)

Compare climate in Sion with other places

Compare temperature, precipitation, sunshine, UV index in Sion, Peru with other places around the world.

Monthly average precipitation in Sion, Peru

Sion usually has the most precipitation in January, March and December, with an average of 26 rainy days and 292 mm (11.5 inches) of precipitation per month. The driest months in Sion are July, August and September. On average, 59 mm (2.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Sion. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)284 (11.2)246 (9.7)296 (11.7)202 (7.9)186 (7.3)112 (4.4)74 (2.9)56 (2.2)48 (1.9)170 (6.7)254 (10.0)296 (11.7)
Average precipitation days (≥ 1 mm)23252824241510912212629

Monthly sunshine hours in Sion, Peru

The sunniest months in Sion are May, July and August, when the sun shines an average of 10 hours 12 minutes a day. Least sunny months in Sion: January, February and March receive an average of 7 hours 53 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Sion. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours213252252270308293320321304295261297
Mean daily daylight hours12h 29m12h 19m12h 7m11h 54m11h 44m11h 40m11h 42m11h 51m12h 3m12h 15m12h 27m12h 32m

Solar UV radiation in Sion, Peru

Sion experiences the highest level of ultraviolet (UV) radiation in January, March and April, when the maximum UV index can reach values of 16 - 17, which corresponds to the Extreme category of sun exposure. June, July and August are in the Extreme exposure category. In these months, the maximum values of the UV index do not exceed 12. For more detailed information, check out our hourly Sion UV Index data.

Average daily maximum UV levels by month for Sion. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)161617161412121214151515