Longer days without making every hill a negotiation with the heat.
The sea has caught up with the postcard. September is still very much a sea month.
Urban bases, culture, food and coastal light work better than pretending it is July.
Walk first. Swim later.
Air: roughly 17°C by day in April, rising into the mid-20s by June. Sea: around 15°C in April and about 22°C in June. Excellent for walking and culture; the beach can look more convincing than it feels until late May or June.
Beach weather, earlier starts.
Expect high-20s daytime heat as the norm, with hotter spells possible; the sea is usually in the low-to-mid 20s. Start long walks early and book ahead whatever really sells out. See what to book →
September is still summer-adjacent.
September is still a sea month: water is commonly around 23°C before cooling through October. Later in autumn, keep an indoor plan ready. Use the rain plan →
Choose a city.
Nice, Menton and Monaco remain credible urban bases. The sea falls towards the mid-teens and some seasonal places close for the winter. Think culture, food, coastal light and a real indoor backup. Keep the rain plan handy →
To decide when to go, return to Plan. For a dated alert or current closure, use Right Now.