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September Weather in Grilly, France

Last updated: August 23, 2025

In Grilly, France, the average temperature in September hovers around 15°C (60°F), making it a mild time of year. During this month, temperatures can dip to a cool 3°C (38°F) at their lowest, while soaring to a comfortable 28°C (83°F) at their peak. Be prepared for some wet days, as precipitation averages 83 mm (3.3 in) over the course of 10 days. With an average humidity of 81%, the air can feel quite humid, adding to the overall atmosphere of the season.

September Temperature in Grilly

In September in Grilly, the average temperature is 15°C (60°F), with maximums reaching 28°C (83°F) and minimums dropping as low as 3°C (38°F). This weather offers a comfortable climate for traveling, making it an ideal time to explore and enjoy outdoor activities.

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

The chart illustrates September temperature patterns in Grilly, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grilly, September typically has an average temperature of 15°C (60°F), with highs reaching up to 28°C (83°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec353943505664676659514237
Data source: Temperature data for Grilly 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 Grilly

In Grilly in September, the total precipitation amount is 83 mm (3.3 in) over a span of 10 days.

September Precipitation Trends in Grilly

The chart displays monthly precipitation patterns in Grilly, 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 Grilly, September typically receives around 83 mm (3.3 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec1281011516417413011711983126121224
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Grilly

In Grilly in September, humidity is 81%. With an average temperature of 15°C (60°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities feel sluggish and draining, which can challenge even the best-prepared traveler.

September Average Humidity in Grilly

This chart illustrates the average monthly humidity levels in Grilly, 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 Grilly 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 Grilly

In Grilly in September, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Grilly, you can refer to this Hourly UV Index in Grilly.

Maximum UV Index Levels in Grilly for September

The chart shows the monthly maximum UV Index (UVI) for Grilly 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 Grilly typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2367810986532
Data source: Grilly 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 Grilly Compares to Other Months

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

This table compares monthly weather conditions in Grilly, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (35°F)128 mm (5.0 inches)91%low
February Weather4°C (40°F)101 mm (4.0 inches)89%moderate
March Weather6°C (44°F)151 mm (5.9 inches)87%high
April Weather10°C (50°F)64 mm (2.5 inches)84%high
May Weather13°C (56°F)174 mm (6.8 inches)80%very high
June Weather18°C (64°F)130 mm (5.1 inches)82%very high
July Weather19°C (67°F)117 mm (4.6 inches)82%very high
August Weather19°C (67°F)119 mm (4.7 inches)77%very high
September Weather15°C (60°F)83 mm (3.3 inches)81%high
October Weather11°C (51°F)126 mm (5.0 inches)89%moderate
November Weather5°C (42°F)121 mm (4.7 inches)89%moderate
December Weather3°C (37°F)224 mm (8.8 inches)91%low

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