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May Weather in Grande-Synthe, France

Last updated: August 23, 2025

In Grande-Synthe, France, the average temperature in May hovers around 13°C (56°F), with a minimum of 3°C (38°F) and a pleasant maximum of 27°C (81°F). Expect a total precipitation of 59 mm (2.3 in) across 11 days, complemented by an average humidity of 82%. Whether you're exploring the scenery or enjoying local attractions, be prepared for a mix of conditions!

May Temperature in Grande-Synthe

In May in Grande-Synthe, the average temperature is 13°C (56°F). Maximum can reach 27°C (81°F) and minimum can be as low as 3°C (38°F). This makes it a great time for travelers to enjoy a mild climate while exploring the area.

May Weather in Grande-Synthe: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Grande-Synthe, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grande-Synthe, May typically has an average temperature of 13°C (56°F), with highs reaching up to 27°C (81°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec424346505663666661554844
Data source: Temperature data for Grande-Synthe 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.

May Precipitation in Grande-Synthe

In Grande-Synthe in May, the precipitation amount is 59 mm (2.3 in) over the course of 11 days.

May Precipitation Trends in Grande-Synthe

The chart displays monthly precipitation patterns in Grande-Synthe, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Grande-Synthe, May typically receives around 59 mm (2.3 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec605458325964507146805593
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Grande-Synthe

In Grande-Synthe in May, humidity is 82%. With an average temperature of 13°C (56°F), this humidity feels like a damp blanket wrapping around you, making it feel much cooler than it is and creating a heavy atmosphere that can be exhausting for travelers.

May Average Humidity in Grande-Synthe

This chart illustrates the average monthly humidity levels in Grande-Synthe, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Grande-Synthe is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%86%85%82%81%76%73%80%89%92%92%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Grande-Synthe

In Grande-Synthe in May, 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 Grande-Synthe.

Maximum UV Index Levels in Grande-Synthe for May

The chart shows the monthly maximum UV Index (UVI) for Grande-Synthe in May, 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 May, the maximum UV index in Grande-Synthe typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578875421
Data source: Grande-Synthe May 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 May Weather in Grande-Synthe Compares to Other Months

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

This table compares monthly weather conditions in Grande-Synthe, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (42°F)60 mm (2.4 inches)91%low
February Weather6°C (44°F)54 mm (2.1 inches)89%low
March Weather8°C (46°F)58 mm (2.3 inches)86%moderate
April Weather10°C (51°F)32 mm (1.2 inches)85%moderate
May Weather13°C (56°F)59 mm (2.3 inches)82%high
June Weather17°C (63°F)64 mm (2.5 inches)81%very high
July Weather19°C (66°F)50 mm (1.9 inches)76%very high
August Weather19°C (66°F)71 mm (2.8 inches)73%high
September Weather16°C (61°F)46 mm (1.8 inches)80%moderate
October Weather13°C (56°F)80 mm (3.2 inches)89%moderate
November Weather9°C (48°F)55 mm (2.1 inches)92%low
December Weather7°C (45°F)93 mm (3.7 inches)92%low

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