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September Weather in Derval, France

Last updated: August 23, 2025

In Derval, France, the average temperature in September hovers around 17°C (62°F). Expect a range that can dip to a chilly 5°C (41°F) and soar up to a toasty 33°C (91°F). During this month, precipitation averages 48 mm (1.9 in) over roughly 8 days, with an average humidity level of 75%.

September Temperature in Derval

In September in Derval, the average temperature is 17°C (62°F), with maximums reaching 33°C (91°F) and minimums dipping as low as 5°C (41°F). This wide temperature range makes it essential for travelers to pack layers to ensure comfort throughout the day.

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

The chart illustrates September temperature patterns in Derval, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Derval, September typically has an average temperature of 17°C (62°F), with highs reaching up to 33°C (91°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec434548525864676662564746
Data source: Temperature data for Derval 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 Derval

In Derval in September, the precipitation amount is 48 mm (1.9 in) over a span of 8 days.

September Precipitation Trends in Derval

The chart displays monthly precipitation patterns in Derval, 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 Derval, September typically receives around 48 mm (1.9 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec466162496693494848867297
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Derval

In Derval in September, humidity is 75%. With an average temperature of 17°C (62°F), this humidity feels like a warm, muggy embrace that can leave travelers feeling sticky and a bit sluggish as they navigate the sights.

September Average Humidity in Derval

This chart illustrates the average monthly humidity levels in Derval, 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 Derval is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%84%83%81%75%65%67%75%85%88%90%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Derval

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

Maximum UV Index Levels in Derval for September

The chart shows the monthly maximum UV Index (UVI) for Derval 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 Derval typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689986422
Data source: Derval 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 Derval Compares to Other Months

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

This table compares monthly weather conditions in Derval, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)46 mm (1.8 inches)88%low
February Weather7°C (45°F)61 mm (2.4 inches)87%moderate
March Weather9°C (48°F)62 mm (2.4 inches)84%moderate
April Weather11°C (53°F)49 mm (1.9 inches)83%high
May Weather14°C (58°F)65 mm (2.6 inches)81%very high
June Weather18°C (64°F)92 mm (3.6 inches)75%very high
July Weather20°C (68°F)49 mm (1.9 inches)65%very high
August Weather19°C (66°F)48 mm (1.9 inches)67%very high
September Weather17°C (62°F)48 mm (1.9 inches)75%high
October Weather13°C (56°F)86 mm (3.4 inches)85%moderate
November Weather9°C (48°F)72 mm (2.8 inches)88%low
December Weather8°C (46°F)97 mm (3.8 inches)90%low

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