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Athens forum regulars call April a genuine shoulder-season sweet spot, if a variable one: late April typically runs “20-25°C in the day and about 13-14 at night,” though early April can still get the final blast of winter on a bad week, and a good one can hit hot sunny days up to about 30 degrees. Rain is real but manageable — “showers rather than prolonged downpours.” One thing April doesn't deliver despite the warm days: swimming weather. “Greeks don't usually start going to the beaches until late May,” with sea temperatures not properly warm until June. Our record: 19.7°C days, 10.4°C nights, 5.4 rain days and a 16.8°C sea — mild with real day-to-day swing, and a sea that backs the “not beach weather yet” read exactly.

Regulars are genuinely split on this month, and both accounts are real rather than one being an outlier - one visitor's mid-March trip saw four sunny days out of five, warm enough for T-shirts in the sun; another's saw heavy rain every single day for the first week. Regulars add that Greece sees a freak winter cold snap in March fairly regularly, not every year, but common enough to plan around. Our row backs the mild average sitting between those extremes, 17.6C over 8.4C nights feeling 6C, with 39mm of rain across 6.6 days and a trace of possible late snow, 0.1cm. The standard advice is packing both winter and spring clothes rather than committing to one, since nights can turn genuinely chilly even on a warm day. The sea sits at a cool 15.5C. The record: humidity 72 percent, 9.8 hours of sun, a 15.9 kph wind and AQI 46.

Regulars split the month cleanly in two: the first half still runs genuinely hot, well short of July and August's peak but firmly summer, while the back half turns more transitional and harder to predict, occasionally bringing a cloudy or wet day. Our row backs the early-month heat, 29.5C reading as a real 30C, over 19.8C nights, with rain still a minor presence overall at 15.6mm across 2.4 days - consistent with most of that falling in the less predictable second half. Regulars' packing list reflects the split directly: swimwear and sunscreen for the early stretch, a light sweater for cooler evenings and an umbrella kept handy for whichever day turns showery. The sea stays warm at 25.4C throughout. The record: humidity 60 percent, 10.9 hours of sun and AQI 49.

May is the month regulars hand to first-time visitors: warm without the summer's weight, almost no rain, and the Acropolis still walkable rather than shuffling. Our row gives 26.2C by day at 59 percent humidity, so the feels-like stays at 26C, over 15.9C nights, with 23.1mm across 5.3 days and 12.3 hours of sun. Their practical instruction has not changed in years - the site is on timed tickets and the first slot at eight or nine is the cool one, or take the last of the day. On the beach question they are honest: the sea reaches 18.8C by the end of the month, which British visitors swim in happily and few others will. The record: a 15 kph wind inside 14.2 hours of daylight, and AQI 52.

Athens-forum threads about summer heat converge on tactics: be at the Acropolis for the 8am opening, because the site is "bare and hot up there", tour groups clog the climb early, and in heatwaves the archaeological sites have closed between 1pm and 5pm. Posters rate 8am over 5pm for both crowds and temperature, and steer visitors toward the quieter Ancient Agora and Kerameikos instead of a second hot climb. July's record explains the planning: 34.4C days feeling like 36C, 23.7C nights, humidity a low 47 percent, 13.1 hours of sun, a 27.5C sea - and barely one and a half precipitation days for the whole month.