The best time to go to Joinville is during the warmer months, specifically from May to September, when the weather is most pleasant for outdoor activities and exploring.During this period, you'll experience mild to warm temperatures with less rainfall, making it ideal for enjoying the town's riverside setting and the surrounding countryside. The days are longer, allowing for more time to visit local attractions like the Château du Grand Jardin and stroll along the River Marne.For those who enjoy outdoor pursuits like cycling or walking, June, July, and August offer the best conditions. The local markets are usually in full swing, and there are often local events and festivals taking place, providing a good opportunity to experience local culture.If you prefer a quieter visit with fewer crowds, late May or early September can be an excellent choice.