Weather and Climate in Luxembourg: What to Expect, Month by Month

Luxembourg sits at the meeting point of the Atlantic and the European continent, so its weather is a blend of two influences. Mild, often damp summers give way to cold, grey winters, and rain falls fairly evenly through the year. Under the Köppen Cfb classification it is a temperate oceanic climate with a moderately continental streak. Here is what to expect, with all numbers given as long-term climate averages (the 1991-2020 normals from MeteoLux).

The big picture

Across the year, the average temperature ranges from about 1.5 C in January to roughly 19 C in July. Precipitation totals around 830 mm a year and is spread across some 180 rainy days - so a packable rain jacket is useful in any month. There is no true dry season; even summer sees regular showers, and June is statistically one of the wetter months.

Geography matters. The hilly north - the Oesling and the Ardennes, at 300-500 m - is noticeably cooler and wetter, with annual rainfall nearing 1,000 mm and more frequent snow. The sheltered Moselle valley in the southeast, at 130-150 m, is the mildest and sunniest corner, receiving closer to 700 mm; it is Luxembourg's wine country for good reason. The capital, at about 375 m, sits in between.

Season by season

Spring (March-May): Cool and changeable, warming from single-digit highs to the high teens by May. Orchards and parks blossom, and the Octave pilgrimage and spring markets fill the capital. Pack layers and a light rain jacket; April is statistically one of the drier months but rarely fully dry.

Summer (June-August): The warmest and most comfortable season. Daytime highs typically reach 23-25 C, with occasional heat spikes - Luxembourg's record is 39 C (July 2019). Evenings stay cool, and showers and thunderstorms are common. This is festival season: Schueberfouer, open-air concerts and the National Day celebrations on 23 June.

Autumn (September-November): Crisp and increasingly grey, sliding from mid-teen highs back toward single digits. The Moselle's wine harvest (Vendanges) runs from roughly mid-September into October, with tastings and grape festivals. Expect fog, falling leaves and rising rainfall.

Winter (December-February): Cold and overcast, with average highs around 3-4 C and lows near or below 0 C. Snow falls occasionally - more often and more lastingly in the Ardennes. December is among the wettest months, but it also brings the Christmas markets (Wantermaart) to Luxembourg City's squares. Pack a warm coat, gloves and waterproof shoes.

Month-by-month at a glance

• January: coldest month, avg ~1.5 C; highs ~4 C, lows ~0 C; grey, occasional snow.
• February: still cold, ~2 C avg; crisp, sometimes snowy.
• March: warming, highs ~9-10 C; early blossoms.
• April: mild, highs ~13-14 C; one of the drier months.
• May: pleasant, highs ~18 C; lush and green.
• June: warm and one of the wettest; highs ~21 C; longest days.
• July: warmest, highs ~23-25 C; festivals and showers.
• August: warm, highs ~23-24 C; thunderstorms possible.
• September: mild, highs ~19 C; harvest begins.
• October: cool, highs ~14 C; autumn colour, more rain.
• November: grey, highs ~8 C; fog and damp.
• December: cold and wet, highs ~4 C; Christmas markets.

Daylight and what to pack

Luxembourg's northern latitude means dramatic seasonal daylight swings. Around the June solstice the capital enjoys about 16 hours 18 minutes of daylight; near the December solstice that shrinks to roughly 8 hours 8 minutes, according to WeatherSpark. Annual sunshine totals around 1,600 hours, concentrated in late spring and summer.

The packing rule is simple: layers and rain protection year-round. In summer, light clothing plus a sweater for cool evenings and an umbrella; in winter, a warm waterproof coat, hat, gloves and sturdy shoes. For the Ardennes in winter, add proper boots - snow lingers there longest. See Climates to Travel for regional detail.