December Weather in Sion, Peru

Last updated: August 27, 2025

In December, the average temperature in Sion, Peru reaches a pleasant 23°C (74°F). Expect a minimum of 17°C (63°F) and a maximum of 32°C (90°F). However, be prepared for frequent showers, as precipitation averages 296 mm (11.7 in) over 29 days, contributing to a high average humidity of 89%.

December Temperature in Sion

In December in Sion, the average temperature is 23°C (74°F). Maximum can reach 32°C (90°F) and minimum can be as low as 17°C (63°F). This mild climate makes Sion an ideal destination for travelers seeking enjoyable outdoor experiences.

December Weather in Sion: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Sion, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sion, December typically has an average temperature of 23°C (74°F), with highs reaching up to 32°C (90°F) and lows dropping to around 17°C (63°F).

Data source: Temperature data for Sion generated using information from the Copernicus Climate Change Service.

December Precipitation in Sion

In Sion, in December, the precipitation amount is 296 mm (11.7 in) over the course of 29 days.

December Precipitation Trends in Sion

The chart displays monthly precipitation patterns in Sion, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Sion, December typically receives around 296 mm (11.7 inches) of precipitation spread over approximately 29 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

December Humidity in Sion

In Sion in December humidity is 89%. With an average temperature of 23°C (74°F), this humidity feels like a warm, heavy blanket enveloping you, making traveling feel stifling and exhausting as you navigate the thick air.

December Average Humidity in Sion

This chart illustrates the average monthly humidity levels in Sion, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Sion is approximately 89%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Sion

In Sion in December, the maximum UV index reaches an alarming 15, which falls into the extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take precautions. For detailed information, you can check the Hourly UV Index in Sion.

Maximum UV Index Levels in Sion for December

The chart shows the monthly maximum UV Index (UVI) for Sion in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Sion typically reaches 15, which falls under the extreme exposure category.

Data source: Sion December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How December Weather in Sion Compares to Other Months

Weather in Sion varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Sion, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Sion, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	23°C (74°F)	284 mm (11.2 inches)	80%	extreme
February Weather	23°C (74°F)	246 mm (9.7 inches)	76%	extreme
March Weather	23°C (73°F)	296 mm (11.7 inches)	81%	extreme
April Weather	23°C (74°F)	202 mm (7.9 inches)	86%	extreme
May Weather	23°C (73°F)	186 mm (7.3 inches)	86%	extreme
June Weather	23°C (73°F)	112 mm (4.4 inches)	70%	extreme
July Weather	22°C (72°F)	74 mm (2.9 inches)	47%	extreme
August Weather	23°C (74°F)	56 mm (2.2 inches)	37%	extreme
September Weather	24°C (76°F)	48 mm (1.9 inches)	42%	extreme
October Weather	24°C (76°F)	170 mm (6.7 inches)	62%	extreme
November Weather	24°C (75°F)	254 mm (10.0 inches)	76%	extreme
December Weather	23°C (74°F)	296 mm (11.7 inches)	89%	extreme