nomadseason

Monthly climate in Sion, Netherlands

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Sion features a oceanic climate (Cfb). Temperatures typically range between 5 °C (41 °F) and 19 °C (66 °F) through the year, but rarely can drop to -8 °C (18 °F) or can rise to as high as 37 °C (98 °F). The average annual precipitation amounts to about 857 mm (33.7 inches) and receives 158 rainy days on the 1 mm (0.04 inches) threshold annually. Sion enjoys an average of 3528 hours of sunshine throughout the year, and daylight varies from 7 hours 49 minutes to 16 hours 37 minutes per day.

Monthly average temperatures in Sion, Netherlands

The warmest months in Sion are June, July and August, with daily mean temperatures ranging from 17 to 19 °C (63 - 66 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 5 to 6 °C (41 - 44 °F) throughout the day. On average each year, Sion experiences 11 days above 25 °C (77.0 °F) and 14 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
Maximum13°C
(56°F)		17°C
(63°F)		21°C
(69°F)		26°C
(79°F)		29°C
(85°F)		30°C
(87°F)		37°C
(98°F)		32°C
(90°F)		29°C
(85°F)		25°C
(77°F)		18°C
(65°F)		13°C
(56°F)
Mean maximum12°C
(53°F)		14°C
(57°F)		17°C
(62°F)		21°C
(71°F)		24°C
(75°F)		26°C
(79°F)		29°C
(85°F)		28°C
(83°F)		26°C
(78°F)		21°C
(71°F)		16°C
(60°F)		13°C
(55°F)
Average high7°C
(45°F)		8°C
(46°F)		10°C
(50°F)		13°C
(56°F)		16°C
(61°F)		20°C
(69°F)		21°C
(70°F)		22°C
(71°F)		19°C
(66°F)		15°C
(60°F)		10°C
(51°F)		8°C
(46°F)
Daily mean5°C
(41°F)		5°C
(42°F)		7°C
(45°F)		9°C
(49°F)		13°C
(55°F)		17°C
(63°F)		18°C
(65°F)		19°C
(66°F)		16°C
(60°F)		13°C
(55°F)		8°C
(47°F)		6°C
(44°F)
Average low3°C
(38°F)		3°C
(38°F)		4°C
(39°F)		6°C
(43°F)		9°C
(49°F)		14°C
(57°F)		15°C
(59°F)		15°C
(60°F)		13°C
(55°F)		10°C
(51°F)		6°C
(43°F)		4°C
(40°F)
Mean minimum-2°C
(29°F)		-3°C
(28°F)		-1°C
(30°F)		0°C
(33°F)		4°C
(39°F)		9°C
(49°F)		11°C
(52°F)		11°C
(53°F)		7°C
(45°F)		5°C
(42°F)		1°C
(34°F)		-1°C
(30°F)
Minimum-5°C
(23°F)		-8°C
(18°F)		-7°C
(19°F)		-1°C
(31°F)		3°C
(38°F)		7°C
(45°F)		10°C
(50°F)		10°C
(50°F)		6°C
(42°F)		3°C
(38°F)		-0°C
(32°F)		-3°C
(27°F)

Compare climate in Sion with other places

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

Monthly average precipitation in Sion, Netherlands

Sion usually has the most precipitation in August, October and December, with an average of 16 rainy days and 97 mm (3.8 inches) of precipitation per month. The driest months in Sion are January, April and May. On average, 53 mm (2.1 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)60 (2.3)64 (2.5)67 (2.6)41 (1.6)59 (2.3)66 (2.6)67 (2.6)88 (3.5)80 (3.1)102 (4.0)62 (2.4)100 (3.9)
Average precipitation days (≥ 1 mm)13121491210131512161418

Monthly sunshine hours in Sion, Netherlands

The sunniest months in Sion are May, June and July, when the sun shines an average of 13 hours 38 minutes a day. Least sunny months in Sion: January, November and December receive an average of 4 hours 57 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 hours117200281363411418424397329243195143
Mean daily daylight hours8h 20m9h 56m11h 54m13h 56m15h 42m16h 37m16h 7m14h 32m12h 35m10h 35m8h 47m7h 49m

Solar UV radiation in Sion, Netherlands

Sion experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 7 - 8, which corresponds to the High / Very High category of sun exposure. January, February 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 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)124578875321