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Aix-en-Provence-forum threads on March weather are consistent that it's genuinely unpredictable early in the month but improves fast as spring takes hold - by mid-March, temperatures often settle into a comfortable range with little rain and plenty of cloudless, sunny days on offer. The one wildcard regulars flag regardless of temperature is the Mistral, the strong, cold wind funneling down from the Alps that can make an otherwise sunny day feel genuinely bracing outdoors. The standing advice is pack serious layers rather than a single spring jacket, since a warm, still afternoon can turn sharply colder the moment that wind picks up. Regulars call late March a strong window, warm enough for the outdoor cafes along the Cours Mirabeau without summer's crowds. The record: 15.8C days feeling like 13C, 5.4C nights, 58mm across 6.6 days, 0.5cm of late-season snowfall, a 13.5C sea, 71 percent humidity and 9.7 hours of sun.

Regulars are specific that the mistral, a strong local wind, can churn cold water up from the depths and leave the sea noticeably colder than the air temperature would suggest, even on an otherwise warm, sunny day. Our row backs the mild, still-swimmable read, 21.3C over 14.4C nights, with 75.4mm of rain across 5.9 days - regulars agree most Octobers stay dry and pleasant, with the real heavy rain typically holding off until November. Regulars are consistent that evenings and nights can turn genuinely cold even after a warm afternoon, so a proper layer for after dark is standard advice rather than optional. The sea itself still sits at a swimmable 21C on a normal day. The record: humidity 76 percent, 8.7 hours of sun, a 19.3 kph wind and AQI 48.

Regulars are specific about the trade this month's signature wind brings: when the mistral blows, it delivers brilliant, mist-free blue skies and excellent visibility, but the wind itself is cold and gusty and can persist for several days straight. Our row backs a mild but breezy read, 18.2C over 10.6C nights, with 43.5mm of rain across 5.9 days and a real 21.2 kph wind - regulars put the odds of a pleasant trip well above 90 percent, with the mistral or a bout of heavy rain as the two realistic ways it can go wrong instead. The sea is still cool at 14.5C, not yet a swimming option most visitors would choose. The record: humidity 69 percent, 10.9 hours of sun and AQI 53.

June here is lovely, regulars say, wind permitting - and the wind is not a figure of speech. The calanques close when the mistral blows from the north-north-west, and they are clear that you would not want the coastal paths on a mistral day anyway. From summer onwards the trails can also shut at short notice for fire risk, so the habit is to check the access line that morning or the evening before rather than to set out and find out. The heat is not yet the problem it becomes in mid-July, though noon to three is still worth avoiding. Our row: 26.6C over 18.9C, 23.3mm across 3.6 days, a 19.8 kph wind and a 22.7C sea.

September is the month Marseille regulars name as the year's best - warm without the blistering heat of August, with genuinely clement evenings - and our row's 25.1C over 17.8C is that. Two things unsettle it. The middle of the month can bring heavy thunderstorms, which is where most of the 56.4mm across 4.4 days lands. And the mistral can blow up at any time: what they call a mini-mistral in September is a sustained northerly lasting 24 to 36 hours that turns a mild day bitter, and blows hard enough that eating outside stops being possible - glasses off the table, food off the plate. It passes. The record: 4.4 precipitation days, humidity 70 percent, 10.6 hours of sun and a 22.7C sea.