September Weather in Sils, Spain

Last updated: August 27, 2025

In Sils, Spain, the average temperature in September hovers around 21°C (69°F), making it a pleasant time to visit. Expect temperatures to range from a minimum of 9°C (48°F) to a comfortable maximum of 31°C (89°F). During your stay, be prepared for 96 mm (3.8 in) of precipitation spread over 15 days, contributing to an average humidity level of 73%.

September Temperature in Sils

In September in Sils, the average temperature is 21°C (69°F). Maximums can reach 31°C (89°F) and minimums can be as low as 9°C (48°F). This makes it a perfect time for travelers to enjoy mild weather and a variety of outdoor activities.

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

The chart illustrates September temperature patterns in Sils, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sils, September typically has an average temperature of 21°C (69°F), with highs reaching up to 31°C (89°F) and lows dropping to around 9°C (48°F).

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

September Precipitation in Sils

In Sils in September, the precipitation amount is 96 mm (3.8 in) over the course of 15 days.

September Precipitation Trends in Sils

The chart displays monthly precipitation patterns in Sils, 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 Sils, September typically receives around 96 mm (3.8 inches) of precipitation spread over approximately 15 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Sils

In Sils in September, humidity is 73%. With an average temperature of 21°C (69°F), this humidity feels like a warm, sticky embrace, making outdoor activities somewhat stifling and travel a bit more challenging, as the air is dense and can leave you feeling fatigued more quickly.

September Average Humidity in Sils

This chart illustrates the average monthly humidity levels in Sils, 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 Sils is approximately 73%, 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 Sils

In Sils in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Sils.

Maximum UV Index Levels in Sils for September

The chart shows the monthly maximum UV Index (UVI) for Sils 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 Sils typically reaches 7, which falls under the high exposure category.

Data source: Sils 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 Sils Compares to Other Months

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

This table compares monthly weather conditions in Sils, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	7°C (45°F)	74 mm (2.9 inches)	77%	moderate
February Weather	10°C (50°F)	52 mm (2.1 inches)	73%	moderate
March Weather	11°C (52°F)	58 mm (2.3 inches)	75%	moderate
April Weather	13°C (56°F)	79 mm (3.1 inches)	77%	high
May Weather	17°C (63°F)	72 mm (2.8 inches)	78%	very high
June Weather	22°C (72°F)	48 mm (1.9 inches)	77%	very high
July Weather	24°C (76°F)	56 mm (2.2 inches)	78%	very high
August Weather	24°C (76°F)	54 mm (2.1 inches)	75%	very high
September Weather	21°C (69°F)	96 mm (3.8 inches)	73%	high
October Weather	17°C (62°F)	129 mm (5.1 inches)	77%	high
November Weather	11°C (53°F)	79 mm (3.1 inches)	77%	moderate
December Weather	9°C (48°F)	37 mm (1.5 inches)	74%	low