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Marbella-forum threads on March weather describe conditions as genuinely hard to predict, ranging anywhere from cool, windy and wet through to a properly warm, low-20s-Celsius sunny stretch within the same general week. Posters are consistent that sunbathing outdoors is unlikely to be the main activity this early in the year, though a hotel with an indoor pool or spa still makes for a reasonable trip regardless of the sky. On the practical side, regulars note most local businesses return from their own off-season break by March, so restaurants and shops are open again even if some beachfront bars stay shuttered a while longer. The standing advice is real layers rather than summer clothing. The record actually runs wetter than the forum's five-rainy-days framing suggests: 17.3C days feeling like 16C, 11.3C nights, a notably high 143mm across 11.7 days, 74 percent humidity, a 15.3C sea and 9.8 hours of sun.

Regulars are consistent this counts as a genuinely delightful month, neither cold nor hot, though they're honest a full week of guaranteed sunshine still can't be promised until the very end of the month. Our row backs that mild, still-showery read, 22.4C over 15.6C nights feeling 15C, with 32.8mm of rain across 4.8 days and humidity at 69 percent. Regulars are specific that when rain does arrive it tends to be a short, sharp shower rather than a settled wet day, clearing back to hot and sunny fairly quickly. The sea sits at a cool 18.7C, still brisk for a long swim but comfortable for a dip. The record: 12.5 hours of sun, a 17.6 kph wind and AQI 46.

Regulars call this a favourite month on this coast specifically for the balance it strikes - not too hot, not too cold, and pleasant evenings that don't need a jacket. Our row backs the comfortable read, 26.2C reading as a real 28C, over 19C nights, with rain almost absent, 7.1mm across 1.6 days. Early in the month, the town's own patron saint festival, the Feria de San Bernabe, brings real crowds and energy around the 11th, worth knowing whether a visitor wants that atmosphere or would rather avoid it. The sea is a mixed bag for swimming - regulars split between finding it comfortably warm enough and still a bit cool depending on personal tolerance, sitting at 20.1C. The record: humidity 62 percent, 13.2 hours of sun, a 17.3 kph wind and AQI 46.

September is the month Marbella regulars rate above every other for the beach, and their reasoning is the sea rather than the sun: the water has had all summer to warm and is at its best now, while the July and August crowds have gone home. Their favourite window is specifically the last fortnight, when the temperature has eased to about 25C - our row says 26.2C reading as 28C with a 23.9C sea - and the odd shower is the only risk. Some report 30s earlier in the month. The trade is straightforward: slightly less heat, considerably fewer people, the warmest water of the year. The record: 20C nights, 3.3 precipitation days carrying 21.5mm and 11 hours of sun.

August on the Marbella forum comes with two practical rules. First, air conditioning is not optional - the coast is hot, inland Andalucia far more so, with 43C in the shade not unheard of, and regulars say a pool or the beach plus air-con is what makes the month bearable. Second, the sea is not a constant: it peaks around 23 to 25C in mid-August, but a Poniente westerly pulls colder Atlantic water up the coast and can drop it within a day. August is also the peak of the season for crowds and prices, which is why Spanish residents on the forum keep recommending the second half of September instead - fewer people, warmer water after a whole summer of heating. The record: 29.4C days feeling like 32C, 22.6C nights, 1 precipitation day, 12.5 hours of sun and a 22.2C sea.