| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 3.7° | -0.9° | 71.9mm | 15.4 | 13 |
| February | 5.7° | -0.2° | 65.7mm | 13.7 | 24 |
| March | 9.9° | 2° | 57.9mm | 13.4 | 41 |
| April | 14.3° | 5° | 50.1mm | 10.9 | 60 |
| May | 18.4° | 8.8° | 74.5mm | 12.7 | 69 |
| June | 22.1° | 12.1° | 70.6mm | 11.4 | 77 |
| July | 23.9° | 13.8° | 75.6mm | 12.1 | 76 |
| August | 23.6° | 13.7° | 73mm | 11.8 | 76 |
| September | 19.3° | 10.4° | 64.1mm | 10.4 | 77 |
| October | 14° | 7° | 80.4mm | 13.4 | 54 |
| November | 7.9° | 2.9° | 74.2mm | 15.1 | 31 |
| December | 4.5° | 0° | 84.7mm | 16.2 | 17 |
January in Luxembourg averages a daily high of 3.7°C with nights around -0.9°C. Expect roughly 15.4 wet days totalling 71.9mm. A hard month to visit for comfort alone.
February in Luxembourg averages a daily high of 5.7°C with nights around -0.2°C. Expect roughly 13.7 wet days totalling 65.7mm. A hard month to visit for comfort alone.
March in Luxembourg averages a daily high of 9.9°C with nights around 2°C. Expect roughly 13.4 wet days totalling 57.9mm. Demanding conditions — pack for it and plan indoor options.
April in Luxembourg averages a daily high of 14.3°C with nights around 5°C. Expect roughly 10.9 wet days totalling 50.1mm. Generally workable, with some weather to plan around.
May in Luxembourg averages a daily high of 18.4°C with nights around 8.8°C. Expect roughly 12.7 wet days totalling 74.5mm. Generally workable, with some weather to plan around.
June in Luxembourg averages a daily high of 22.1°C with nights around 12.1°C. Expect roughly 11.4 wet days totalling 70.6mm. Comfortable conditions for being outdoors all day.
July in Luxembourg averages a daily high of 23.9°C with nights around 13.8°C. Expect roughly 12.1 wet days totalling 75.6mm. Comfortable conditions for being outdoors all day.
August in Luxembourg averages a daily high of 23.6°C with nights around 13.7°C. Expect roughly 11.8 wet days totalling 73mm. Comfortable conditions for being outdoors all day.
September in Luxembourg averages a daily high of 19.3°C with nights around 10.4°C. Expect roughly 10.4 wet days totalling 64.1mm. Comfortable conditions for being outdoors all day.
October in Luxembourg averages a daily high of 14°C with nights around 7°C. Expect roughly 13.4 wet days totalling 80.4mm. Demanding conditions — pack for it and plan indoor options.
November in Luxembourg averages a daily high of 7.9°C with nights around 2.9°C. Expect roughly 15.1 wet days totalling 74.2mm. A hard month to visit for comfort alone.
December in Luxembourg averages a daily high of 4.5°C with nights around 0°C. Expect roughly 16.2 wet days totalling 84.7mm. A hard month to visit for comfort alone.
Each month scores out of 100. It starts at 100 and loses points for daytime highs outside a 20–27°C band, for wet days, and for nights below 2°C. Nothing else is weighted in — no crowd data, no prices, no opinion. Luxembourg peaks at 77.
Based on 30 years of records, May–September scores highest for comfort in Luxembourg, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 23.9°C.
December is the wettest, averaging 84.7mm of rain across roughly 16.2 wet days.
January is the coolest month, with average daily highs around 3.7°C.