| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 4.2° | -1.1° | 75.1mm | 16.5 | 15 |
| February | 5.8° | -1.1° | 63.2mm | 13.9 | 22 |
| March | 10° | 0.5° | 62.3mm | 12.4 | 41 |
| April | 15.3° | 3.6° | 38.9mm | 10.1 | 65 |
| May | 18.5° | 7.2° | 73.1mm | 13.1 | 69 |
| June | 22.3° | 10.9° | 70.8mm | 12.3 | 75 |
| July | 24.3° | 12.6° | 71.1mm | 13.6 | 73 |
| August | 23.3° | 11.9° | 73.5mm | 12.9 | 74 |
| September | 19.8° | 8.8° | 52.9mm | 9.8 | 80 |
| October | 14.3° | 5.8° | 60.5mm | 13.1 | 56 |
| November | 8.4° | 2.6° | 62.1mm | 13.8 | 35 |
| December | 5.2° | 0.2° | 86.9mm | 17.9 | 20 |
January in Koblenz averages a daily high of 4.2°C with nights around -1.1°C. Expect roughly 16.5 wet days totalling 75.1mm. A hard month to visit for comfort alone.
February in Koblenz averages a daily high of 5.8°C with nights around -1.1°C. Expect roughly 13.9 wet days totalling 63.2mm. A hard month to visit for comfort alone.
March in Koblenz averages a daily high of 10°C with nights around 0.5°C. Expect roughly 12.4 wet days totalling 62.3mm. Demanding conditions — pack for it and plan indoor options.
April in Koblenz averages a daily high of 15.3°C with nights around 3.6°C. Expect roughly 10.1 wet days totalling 38.9mm. Generally workable, with some weather to plan around.
May in Koblenz averages a daily high of 18.5°C with nights around 7.2°C. Expect roughly 13.1 wet days totalling 73.1mm. Generally workable, with some weather to plan around.
June in Koblenz averages a daily high of 22.3°C with nights around 10.9°C. Expect roughly 12.3 wet days totalling 70.8mm. Comfortable conditions for being outdoors all day.
July in Koblenz averages a daily high of 24.3°C with nights around 12.6°C. Expect roughly 13.6 wet days totalling 71.1mm. Generally workable, with some weather to plan around.
August in Koblenz averages a daily high of 23.3°C with nights around 11.9°C. Expect roughly 12.9 wet days totalling 73.5mm. Generally workable, with some weather to plan around.
September in Koblenz averages a daily high of 19.8°C with nights around 8.8°C. Expect roughly 9.8 wet days totalling 52.9mm. Comfortable conditions for being outdoors all day.
October in Koblenz averages a daily high of 14.3°C with nights around 5.8°C. Expect roughly 13.1 wet days totalling 60.5mm. Generally workable, with some weather to plan around.
November in Koblenz averages a daily high of 8.4°C with nights around 2.6°C. Expect roughly 13.8 wet days totalling 62.1mm. Demanding conditions — pack for it and plan indoor options.
December in Koblenz averages a daily high of 5.2°C with nights around 0.2°C. Expect roughly 17.9 wet days totalling 86.9mm. 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. Koblenz peaks at 80.
Based on 30 years of records, June–September scores highest for comfort in Koblenz, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 24.3°C.
December is the wettest, averaging 86.9mm of rain across roughly 17.9 wet days.
January is the coolest month, with average daily highs around 4.2°C.