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September Weather in Grandvillard, Switzerland

Last updated: August 27, 2025

In September, the average temperature in Grandvillard, Switzerland hovers around 13°C (56°F). Expect a minimum chill of 1°C (34°F) and a comfortable maximum of 26°C (78°F). Be prepared for some rain, as 100 mm (3.9 in) of precipitation can fall over 13 days. Additionally, the air feels quite humid with an average humidity of 81%.

September Temperature in Grandvillard

In September in Grandvillard, the average temperature is 13°C (56°F). The maximum can reach 26°C (78°F), while the minimum can drop to as low as 1°C (34°F). This makes it a great time for travelers to enjoy a mix of mild and warm weather, perfect for outdoor activities and sightseeing.

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

The chart illustrates September temperature patterns in Grandvillard, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grandvillard, September typically has an average temperature of 13°C (56°F), with highs reaching up to 26°C (78°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec293438445160636256483931
Data source: Temperature data for Grandvillard generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Grandvillard

In Grandvillard in September, the total precipitation amount is 100 mm (3.9 in), occurring over a span of 13 days.

September Precipitation Trends in Grandvillard

The chart displays monthly precipitation patterns in Grandvillard, 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 Grandvillard, September typically receives around 100 mm (3.9 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec13210613576182159165152100120106208
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Grandvillard

In Grandvillard in September, humidity is 81%. With an average temperature of 13°C (56°F), this humidity feels like a blanket of damp air that clings to your skin, making it essential to pack breathable clothing and stay hydrated while exploring.

September Average Humidity in Grandvillard

This chart illustrates the average monthly humidity levels in Grandvillard, 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 Grandvillard is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%87%84%80%82%82%77%81%89%89%91%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Grandvillard

In Grandvillard 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 Grandvillard.

Maximum UV Index Levels in Grandvillard for September

The chart shows the monthly maximum UV Index (UVI) for Grandvillard 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 Grandvillard typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2467810997532
Data source: Grandvillard 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 Grandvillard Compares to Other Months

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

This table compares monthly weather conditions in Grandvillard, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)132 mm (5.2 inches)91%low
February Weather1°C (34°F)106 mm (4.2 inches)89%moderate
March Weather3°C (38°F)135 mm (5.3 inches)87%high
April Weather7°C (45°F)76 mm (3.0 inches)84%high
May Weather11°C (51°F)182 mm (7.2 inches)80%very high
June Weather16°C (60°F)159 mm (6.3 inches)82%very high
July Weather17°C (63°F)165 mm (6.5 inches)82%very high
August Weather17°C (62°F)152 mm (6.0 inches)77%very high
September Weather13°C (56°F)100 mm (3.9 inches)81%high
October Weather9°C (48°F)120 mm (4.7 inches)89%moderate
November Weather4°C (39°F)106 mm (4.2 inches)89%moderate
December Weather0°C (32°F)208 mm (8.2 inches)91%low

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