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September Weather in Guillestre, France

Last updated: August 23, 2025

In September, the average temperature in Guillestre, France hovers around 9°C (48°F), with extremes ranging from a chilly -6°C (22°F) to a mild 22°C (72°F). Expect about 44 mm (1.7 in) of precipitation spread across 7 days, contributing to a relatively high average humidity of 73%. Stay prepared for a mix of weather as you enjoy the season!

September Temperature in Guillestre

In September in Guillestre, the average temperature is 9°C (48°F). Maximums can reach 22°C (72°F), while minimums can drop as low as -6°C (22°F). This varied climate makes it essential for travelers to pack layers to ensure comfort during their stay.

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

The chart illustrates September temperature patterns in Guillestre, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Guillestre, September typically has an average temperature of 9°C (48°F), with highs reaching up to 22°C (72°F) and lows dropping to around -6°C (22°F).
JanFebMarAprMayJunJulAugSepOctNovDec172326323950555548402719
Data source: Temperature data for Guillestre 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 Guillestre

In Guillestre in September, the precipitation amount is 44 mm (1.7 in) spread over a duration of 7 days.

September Precipitation Trends in Guillestre

The chart displays monthly precipitation patterns in Guillestre, 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 Guillestre, September typically receives around 44 mm (1.7 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec6557938513010061414495114122
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Guillestre

In Guillestre in September, humidity is 73%. With an average temperature of 9°C (48°F), this humidity feels like a chilly dampness that settles into your bones, making outdoor exploration feel invigorating yet a bit uncomfortable, urging travelers to bundle up while still enjoying the fresh air and vibrant scenery.

September Average Humidity in Guillestre

This chart illustrates the average monthly humidity levels in Guillestre, 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 Guillestre is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%87%84%83%78%75%72%63%73%89%91%90%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Guillestre

In Guillestre in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Guillestre.

Maximum UV Index Levels in Guillestre for September

The chart shows the monthly maximum UV Index (UVI) for Guillestre 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 Guillestre typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101110108632
Data source: Guillestre 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 Guillestre Compares to Other Months

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

This table compares monthly weather conditions in Guillestre, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-8°C (17°F)65 mm (2.6 inches)91%moderate
February Weather-5°C (23°F)57 mm (2.3 inches)87%moderate
March Weather-3°C (26°F)93 mm (3.7 inches)84%high
April Weather0°C (32°F)85 mm (3.3 inches)83%very high
May Weather4°C (40°F)130 mm (5.1 inches)78%very high
June Weather10°C (50°F)100 mm (3.9 inches)75%extreme
July Weather13°C (55°F)61 mm (2.4 inches)72%very high
August Weather13°C (56°F)41 mm (1.6 inches)63%very high
September Weather9°C (48°F)44 mm (1.7 inches)73%very high
October Weather4°C (40°F)95 mm (3.7 inches)89%high
November Weather-3°C (27°F)114 mm (4.5 inches)90%moderate
December Weather-7°C (20°F)122 mm (4.8 inches)90%low

Compare Guillestre's Climate with Cities Worldwide