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September Weather in Grand, France

Last updated: August 23, 2025

In September, the average temperature in Grand, France hovers around a mild 16°C (60°F). However, be prepared for some variability, as temperatures can dip to a chilly 4°C (39°F) or soar to a warm 32°C (89°F). With precipitation averaging 64 mm (2.5 in) across about 10 days, and the air usually feeling quite humid at 83%, it's wise to pack accordingly!

September Temperature in Grand

In September in Grand, the average temperature is 16°C (60°F), with maximums reaching up to 32°C (89°F) and minimums dropping as low as 4°C (39°F). This diverse temperature range makes it an ideal time for travelers to enjoy both warm days and cooler evenings.

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

The chart illustrates September temperature patterns in Grand, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grand, September typically has an average temperature of 16°C (60°F), with highs reaching up to 32°C (89°F) and lows dropping to around 4°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec364144505665686760534340
Data source: Temperature data for Grand 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 Grand

In Grand in September, the precipitation amount is 64 mm (2.5 in) over a span of 10 days.

September Precipitation Trends in Grand

The chart displays monthly precipitation patterns in Grand, 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 Grand, September typically receives around 64 mm (2.5 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec10187954386846248647983142
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Grand

In Grand in September humidity is 83%. With an average temperature of 16°C (60°F), this humidity feels like a warm, heavy blanket wrapping around you, making outdoor activities a bit uncomfortable for traveling.

September Average Humidity in Grand

This chart illustrates the average monthly humidity levels in Grand, 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 Grand is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec92%90%88%84%81%82%82%80%83%89%91%93%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Grand

In Grand 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 Grand, you can refer to this Hourly UV Index in Grand.

Maximum UV Index Levels in Grand for September

The chart shows the monthly maximum UV Index (UVI) for Grand 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 Grand typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689986421
Data source: Grand 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 Grand Compares to Other Months

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

This table compares monthly weather conditions in Grand, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (37°F)101 mm (4.0 inches)91%low
February Weather5°C (41°F)87 mm (3.4 inches)90%moderate
March Weather7°C (44°F)95 mm (3.7 inches)88%moderate
April Weather10°C (50°F)43 mm (1.7 inches)84%high
May Weather13°C (57°F)86 mm (3.4 inches)81%very high
June Weather18°C (65°F)84 mm (3.3 inches)82%very high
July Weather20°C (68°F)62 mm (2.4 inches)82%very high
August Weather19°C (67°F)48 mm (1.9 inches)80%very high
September Weather16°C (60°F)64 mm (2.5 inches)83%high
October Weather11°C (53°F)79 mm (3.1 inches)89%moderate
November Weather6°C (43°F)83 mm (3.3 inches)91%low
December Weather4°C (40°F)142 mm (5.6 inches)93%low

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