The best time to visit Luxembourg City is June through September, when average highs sit comfortably between 19.6 °C and 23.5 °C with 10 to 11 rain days and long daylight for wandering the Old Quarters. August peaks at 23.5 °C with just 10 rain days, while June already warms to 22.3 °C. July and August are peak season, coinciding with school holidays and the busiest weeks in the city. Winter is the quiet low season, cold and grey with as little as 2.6 hours of sunshine a day in December.
Best months JuneJulyAugustSeptember
Luxembourg City month by month
Average highs and lows (°C), 2016–2025. Highlighted bars are the best months.
| Month | High | Low | Rain days | Sun / day |
|---|---|---|---|---|
| January | 4.5 °C | -0.3 °C | 14 | 3.2 h |
| February | 7 °C | 0.7 °C | 12 | 5.1 h |
| March | 10.1 °C | 2.1 °C | 13 | 7.2 h |
| April | 13.5 °C | 4.2 °C | 11 | 9.7 h |
| May | 17.6 °C | 8.3 °C | 12 | 11.1 h |
| June | 22.3 °C | 12.9 °C | 11 | 11.8 h |
| July | 23.2 °C | 13.8 °C | 11 | 11.9 h |
| August | 23.5 °C | 14.2 °C | 10 | 11 h |
| September | 19.6 °C | 10.8 °C | 11 | 9.2 h |
| October | 14.6 °C | 7.8 °C | 13 | 6 h |
| November | 8.4 °C | 3.3 °C | 13 | 3.9 h |
| December | 5.7 °C | 1.4 °C | 15 | 2.6 h |
How the months are picked.A month qualifies when its average high sits in the comfortable 20–28 °C band (scored down towards 9 °C and 37 °C), rain days are few and sunshine hours are high — at least 78 % of the city's best-scoring month. July and August are then set aside as peak season (school-holiday crowds and prices) whenever at least three other months qualify; where summer is the only comfortable window they stay. Figures are ten-year averages (2016-01-01 to 2025-12-31) from ERA5 reanalysis data via Open-Meteo (CC BY 4.0) for the city centre coordinates.
When to go, and what to expect
Spring (Mar–May)
Good for cooler sightseeing and blossom, if you don't mind the odd damp day.
Summer (Jun–Aug)
The prime stretch for the Old Quarters and outdoor cafés — book ahead.
Autumn (Sep–Nov)
September is a sweet spot; later autumn turns wet and grey.
Winter (Dec–Feb)
Worth it mainly for festive markets; pack warm layers.
Notable events
- Late August to early September
- Schueberfouer funfair
- 23 June
- National Day (Fête Nationale)
- Late November to December
- Winterlights Christmas markets
- April–May
- Octave religious pilgrimage and market
Frequently asked
Is August too hot in Luxembourg City?
No. August averages a high of 23.5 °C with a low of 14.2 °C, comfortably within the pleasant range, plus 10 rain days and 11 hours of sunshine a day.
What is the rainiest month?
December is the wettest, with 15 rain days, followed by January and July-area months; summer months average 10 to 11 rain days, among the drier stretches.
Is winter worth visiting?
It's the quiet low season — highs of 4.5 °C in January and just 2.6 hours of sunshine a day in December — but the Winterlights Christmas markets make late November and December atmospheric if you dress warmly.
Know when to go? Now decide where to stay — our Luxembourg City area guide →
Areas of Luxembourg City
Best time to visit near here
Sources
- Open-Meteo historical weather API — monthly climate normals, 2016–2025 (CC BY 4.0)
- ERA5 reanalysis (ECMWF / Copernicus) — the underlying temperature, precipitation and sunshine data
- ReasonStay methodology — how the best months are computed and checked
An independent guide to Luxembourg City — honest, verified, no invented data. Climate figures: ERA5 via Open-Meteo, 2016–2025 averages; the best months are computed from them, not opinion.