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Grande-Synthe Weather in September
Grande-Synthe in September sees pleasant daytime temperatures of 20°C (68°F) and nighttime lows of 13°C (55°F). Rainfall is fairly high this month at around 64 mm (2.5 in), so pack a rain jacket to stay dry.
Rainfall in Grande-Synthe in September
Rain is expected on roughly 15 days, totalling around 64 mm (2.5 in) for the month. Rain is frequent but mostly light this month, with brief showers more common than heavy downpours.
Temperature in Grande-Synthe in September
The temperature in Grande-Synthe in September is excellent. Daytime highs reach 20°C (68°F), with nights dropping to 13°C (55°F). September is part of summer. A light jacket or extra layer can be useful, especially outside the warmest hours of the day. With overnight lows of 13°C (55°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.
Sunshine in Grande-Synthe in September
The month experiences a moderate amount of sunlight, with 160 hours of sunshine. This provides a nice balance between sunshine and clouds.If your ideal day consists of dry skies and pleasant temperatures, June, July, August and September typically offer the best circumstances for Grande-Synthe.
Grande-Synthe Temperature in September
Min Temperature
13°C (55°F)
Max Temperature
20°C (68°F)
Chance of Rain
51%
Precipitation
64 mm (2.5 in)
Rainy days
15 days
Humidity
86% *
Sunshine
160 hours *
Percentage Sunshine
*
* Data from: Ostend, Belgium (44 KM, 27 Miles).
Grande-Synthe Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Grande-Synthe - and find the best time to visit.
Best Places in France in September
Find out more about the weather in France and which places have the best travel conditions in this month. See all of France in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Grande-Synthe in September
Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Wet weather is likely, so pack waterproof gear for multiple rainy days. Bring sunglasses since you'll have some sunny periods throughout the month
What To Do in Grande-Synthe in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming6/10 -
Cycling10/10 -
Walking10/10 -
Camping8/10 -
Outdoor sports10/10
Grande-Synthe 3-Day Forecast
More climate data for Grande-Synthe
Temperature Rainfall Sunshine Humidity
See the full Grande-Synthe climate overview or explore weather in France.
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Where to go in September - average daytime high across popular destinations.
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