September Weather in Sion, Peru

Last updated: August 27, 2025

In September, the average temperature in Sion, Peru is a pleasant 24°C (76°F). Temperatures can vary significantly, with minimums dropping to 16°C (61°F) and maximums soaring to 35°C (95°F). During this month, expect about 48 mm (1.9 in) of precipitation spread over 12 days, along with an average humidity of 42%.

September Temperature in Sion

In September in Sion, the average temperature is 24°C (76°F). Maximums can reach 35°C (95°F), and minimums can be as low as 16°C (61°F). This makes Sion an ideal destination for travelers seeking mild weather with warm days and cool evenings.

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

The chart illustrates September 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, September typically has an average temperature of 24°C (76°F), with highs reaching up to 35°C (95°F) and lows dropping to around 16°C (61°F).

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

September Precipitation in Sion

In Sion in September, the precipitation amount is 48 mm (1.9 in) over a span of 12 days.

September Precipitation Trends in Sion

The chart displays monthly precipitation patterns in Sion, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Sion, September typically receives around 48 mm (1.9 inches) of precipitation spread over approximately 12 days.

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

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Millimeters (mm) Inches (in)

September Humidity in Sion

In Sion in September humidity is 42%. With an average temperature of 24°C (76°F), this humidity feels like a pleasant embrace, making it ideal for exploring the local sights without feeling overly sticky or uncomfortable.

September Average Humidity in Sion

This chart illustrates the average monthly humidity levels in Sion, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Sion is approximately 42%, offering insight into how humid the weather typically is during this month.

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

September UV Index in Sion

In Sion in September, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in Sion, you can check here.

Maximum UV Index Levels in Sion for September

The chart shows the monthly maximum UV Index (UVI) for Sion in September, 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 September, the maximum UV index in Sion typically reaches 14, which falls under the extreme exposure category.

Data source: Sion September 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 September 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 September’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 September’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