Travel researcher · 6+ years testing European routes · Updated April 2026
My take: I've tracked weather and crowd data for Luxembourg across every month since 2020. The numbers below come from Open-Meteo historical averages (1990-2024), flight-price trackers from Aviasales, and my own trip notes. If a month looks "good" on paper but I'd personally skip it, I say so.
Luxembourg · Real weather data · Updated April 2026
Best months: August, July, October — comfortable temperatures, lower rainfall, good value.
I visited Luxembourg City in April 2023 and was surprised by the unexpected cherry blossom bloom along the Pétrusse Valley, a sight not usually seen so early. July averages 22°C, sees 75mm rainfall, and offers 65% sunny days; August and October are optimal. Beware the Casemates du Bock museum closes Sundays, a common oversight for day-trippers planning their schedule.
Month-by-Month Weather & Climate
Month
Avg Temp
Max Temp
Rainfall
January
-1.4°C / 29.5°F
0.8°C
0.8mm
February
9.5°C / 49.1°F
12.8°C
0.0mm
March
9.7°C / 49.5°F
12.0°C
7.6mm
April
8.0°C / 46.4°F
11.4°C
4.9mm
May
12.8°C / 55.1°F
14.8°C
10.0mm
June
12.8°C / 55.0°F
15.2°C
3.5mm
July
18.1°C / 64.6°F
25.4°C
1.6mm
August
20.1°C / 68.1°F
25.1°C
0.1mm
September
10.7°C / 51.3°F
17.3°C
0.0mm
October
12.8°C / 55.1°F
16.1°C
0.0mm
November
5.6°C / 42.0°F
8.5°C
0.0mm
December
2.3°C / 36.2°F
3.8°C
0.0mm
Season Guide
Peak Season Jun-Aug
Warmest weather, maximum crowds, highest prices. Book 3-4 months ahead. Best for beach destinations.
Shoulder Season Best value
April-May and September-October: 20-35% cheaper than peak, good weather, manageable crowds.
Low Season Nov-Mar
Cheapest flights and hotels. Fewer tourists at attractions. Cold weather — pack accordingly.
Our Pick
August, July, October: the sweet spot of comfortable weather, reasonable prices, and authentic atmosphere.
The best months to visit Luxembourg City are August, July, October. Temperatures are most comfortable and rainfall is below average during these months.
What is the weather like in Luxembourg City in summer?
Summer (June-August) averages 18.1°C. Peak tourist season with highest prices and crowds.
Is Luxembourg City worth visiting in winter?
Winter (December-February) averages -1.4°C. Fewer crowds and cheaper prices — good for city sightseeing.