What’s the weather like in Monte Carlo in September?The summer crowds fade in September but the weather is still warm and sunny, making it the perfect time to visit for excellent weather and fewer crowds.
Geographical influencesMonte Carlo weather in September is very warm thanks to the region’s Mediterranean climate. Regular sea breezes offer refreshing breaks from the heat and the sea is warm enough for swimming and water sports. The nearby mountains provide shelter from the cold, helping to make sure the region enjoys mild weather all year round.
AveragesThe good weather remains in September with warm temperatures and long, sunny days lasting throughout the month. The warmest weather is towards the start of the month but the overall average temperature is 22°C, which is great for working on your tan and relaxing on the beach. The evenings are still mild at around 20°C. Swimming in the sea is still enjoyable and the average water temperature rarely drops below 22°C. There’s slightly less sunshine than previous months, but you’ll still have ten hours of sunshine a day with 74% humidity. The average monthly rainfall is 66mm, which means you can expect four days of rain throughout the month.