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Luxembourg City forum regulars won't commit to a single forecast for March: “the most probable weather...is cold and wet, though it could be sunny and almost warm, or it could be really cold with sleet or snow and ice on the ground.” The comparison offered for calibration is England's weather — “some rainy days, some dry days, perhaps even some sunny days, but no freezing cold and no picnic weather.” Snow risk is genuinely low by late March, about a 1% chance, though “winter tyres are compulsory...whenever conditions are wintry.” Most attractions stay open through the month, and walking gets noticeably easier as it wears on. Our record: 9.3°C days, 1°C nights, 13 rain days and a 20.1kph wind that does real work against the “cold and wet” read — with 2cm of snow across the month, consistent with “could” rather than “will.”

Regulars planning even a short two-day visit lean on the long daylight this month gives them to cram in sightseeing and evening plans - genuinely the year's longest days, over 16 hours between sunrise and sunset. Our row backs the mild, pleasant read, 22.8C over 12.6C nights, with 69.7mm of rain across 10.1 days. Regulars call this a genuinely great month to visit, warm enough for outdoor exploring without summer's later heat, with the extra daylight hours making a packed itinerary more realistic than in shorter-day months. The record: humidity 72 percent, 11.7 hours of sun, a 15.7 kph wind and AQI 49.

Regulars pitch this month by comparison rather than by number: pack for what you would wear at home in London, maybe a touch lighter for walking, since the climate does not differ much from the UK's, if a little less rainy. Our row supports the comparison at 24C over 13.6C, with 74.8mm across 8.7 days at 68.8 percent humidity - warm without being demanding. Their standing advice is layers: light summer clothes for the day, a set for cooler spells, closed shoes that can take a shower, and something for the evening when temperatures drop back. The city itself rewards a stroll through its parks and the underground Petrusse Casemates whatever the sky is doing. The record: 11.5 hours of sun, a 15.7 kph wind and AQI 42.

Asked to choose between September and October, regulars answer with what you came for: September is warmer but too early for colour, and the golden weeks here come at the end of October into November, with lazy foggy mornings and the leaves lit at midday. They add the honest caveat that high wind can strip it overnight. Our row explains the mornings - 84 percent humidity and only 5.5 hours of sun a day - under 13.9C afternoons that read as 12C and 7C nights that read as 5C. Rain is 79.1mm across 10.9 days. This is a walking month for the valley and the Mullerthal rather than a terrace one. The record: a 17.8 kph wind and AQI 34.

August in Luxembourg City is the month the city empties. A great many people are away or working from home, so the streets are quiet and there is parking to be had - and a good number of restaurants shut for the whole month or most of it, because their expense-account custom has gone with them. The 15th is a public holiday on top, which closes more. The weather is mild rather than hot, and the country's own draw this month is outdoors: the Mullerthal around Echternach for walking and cycling, and the Ardennes around Wiltz in the north. The record: 23.9C days that feel like 23C, 13.9C nights, 7.8 precipitation days carrying 51.4mm and 10.8 hours of sun.