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Nice forum regulars describe March as pleasant but genuinely two-toned within the day: quite cool in the mornings but very pleasant in the afternoons, not cold but rather cool in the morning and evening, with a dull day feeling noticeably cooler than a sunny one at the same temperature. Typical afternoon readings run high teens, rain a real possibility but rare in the last couple of years by several accounts. Layers are the standard advice for exactly this daily swing, alongside a light jacket and small umbrella just in case. The month's genuine upside: quieter than peak season, sitting comfortably after Carnival and just before Easter. Our record: 15.3°C days, 7.4°C nights, 5.2 rain days, 10 hours of sun and a 14°C sea — mild and mostly dry, matching the “cool morning, pleasant afternoon” read closely.

Regulars are honest the averages here read as close to perfect but a genuinely bad spell can still sneak in, layers the standard advice even on a trip that turns out mostly warm and sunny around 30C. Our row backs that mild, genuinely dry read, 21.2C over 14.1C nights, with rain minimal at 32.3mm across just 1.7 days and humidity at 75 percent. Regulars are consistent the sea itself stays properly cold for swimming even when the air feels like full summer, a short, sharp rain shower a real possibility rather than a settled wet day. This remains a genuinely pleasant month for walking the Croisette and the old town before the peak-season crowds of July and August arrive. The sea sits at a cool 18.9C. The record: 12.2 hours of sun, a 17 kph wind and AQI 51.

Cannes-forum threads on December-January travel describe a genuinely split personality month: on a good day it's warm enough for sunbathing right on the Croisette, sunbathers and people in fur coats and scarves sharing the same beach within view of each other, while a bad stretch turns properly cold and grey. Posters call the cold, when it shows up, a dry, crisp kind rather than a damp chill, easier to dress for than a wetter winter climate. Rain is what regulars flag as the real trip-dampener - a rainy stretch leaves noticeably less to do outdoors than a cold-but-dry one, since much of the town's appeal is the promenade and beachfront. The standing packing advice is layers on top of a normal autumn wardrobe, ready for either version of the month. The record: 14.2C days feeling like 12C, 6.2C nights, 73mm across 5.5 days, 0.3cm of rare snowfall, a 16.3C sea, 79 percent humidity and 6.5 hours of sun.

Cannes-forum threads on September are quick to correct one common mix-up: the Film Festival runs for two weeks each May, not September, so there's no festival crowd or festival pricing to plan around this time of year - just the actual weather. That weather gets good reviews: temperatures in the low-to-mid 20s Celsius, a sea still warm enough for genuinely pleasant swimming, showers rare early in the month and, even when one does show up toward the end, short and followed by a quick return of sun. Crowds reduce immediately once September starts, with posters calling it both cheaper and calmer than high summer. The record: 25.6C days feeling like 27C, 18C nights, 45mm total across under three days, 10.6 hours of sun and a 24.2C sea.

June in Cannes is the month the Riviera works best, on the forum's reckoning: dry and sunny almost every day, afternoons near 80F in the shade, and beaches that are not yet heaving the way they will be in July and August. Our row gives 25.9C reading as 28C, with 0.5 precipitation days, though regulars note the occasional thunderstorm. The split inside the month is the sea. It sits around 70F - our row says 23.3C - which by late June they call perfect and in early June many still find a little cold, so the recognisable early-June scene is a beach full of people sunbathing and very few of them in the water. The record: 18.8C nights, 17.3mm of rain, 13.4 hours of sun and a 15.4-hour day.