Luxembourg City experiences a temperate oceanic climate with mild summers, cool winters, and no true dry season.

Rain falls consistently throughout the year, making waterproof outerwear a wardrobe staple rather than a seasonal consideration.

Temperatures range from around -2°C in January to 23°C in July, with extremes rarely venturing beyond these bounds.

The city's valley location creates persistent humidity and frequent fog, particularly during transitional seasons when the Alzette and Pétrusse rivers contribute to the atmospheric moisture.

Layering proves essential here not for dramatic temperature swings but for navigating the microclimate shifts between the fortified upper town and the sheltered Grund below.