| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 5.2° | 1.1° | 69.5mm | 16.7 | 21 |
| February | 5.9° | 1.2° | 58.7mm | 13.7 | 26 |
| March | 8.6° | 2.6° | 52.3mm | 13.1 | 37 |
| April | 12.8° | 5.6° | 42.3mm | 11.5 | 54 |
| May | 16.5° | 9.2° | 58.3mm | 12.2 | 64 |
| June | 19.4° | 12.2° | 69.1mm | 13.1 | 72 |
| July | 21.5° | 14.4° | 95.7mm | 15.3 | 70 |
| August | 21.8° | 14.5° | 85.6mm | 15.7 | 70 |
| September | 18.9° | 12.2° | 75.6mm | 13.8 | 69 |
| October | 14.3° | 8.8° | 81.1mm | 16.3 | 52 |
| November | 9.2° | 4.8° | 74.2mm | 17.2 | 35 |
| December | 6.1° | 2.2° | 77.8mm | 18.6 | 26 |
January in Wilhelmshaven averages a daily high of 5.2°C with nights around 1.1°C. Expect roughly 16.7 wet days totalling 69.5mm. A hard month to visit for comfort alone.
February in Wilhelmshaven averages a daily high of 5.9°C with nights around 1.2°C. Expect roughly 13.7 wet days totalling 58.7mm. A hard month to visit for comfort alone.
March in Wilhelmshaven averages a daily high of 8.6°C with nights around 2.6°C. Expect roughly 13.1 wet days totalling 52.3mm. Demanding conditions — pack for it and plan indoor options.
April in Wilhelmshaven averages a daily high of 12.8°C with nights around 5.6°C. Expect roughly 11.5 wet days totalling 42.3mm. Demanding conditions — pack for it and plan indoor options.
May in Wilhelmshaven averages a daily high of 16.5°C with nights around 9.2°C. Expect roughly 12.2 wet days totalling 58.3mm. Generally workable, with some weather to plan around.
June in Wilhelmshaven averages a daily high of 19.4°C with nights around 12.2°C. Expect roughly 13.1 wet days totalling 69.1mm. Generally workable, with some weather to plan around.
July in Wilhelmshaven averages a daily high of 21.5°C with nights around 14.4°C. Expect roughly 15.3 wet days totalling 95.7mm. Generally workable, with some weather to plan around.
August in Wilhelmshaven averages a daily high of 21.8°C with nights around 14.5°C. Expect roughly 15.7 wet days totalling 85.6mm. Generally workable, with some weather to plan around.
September in Wilhelmshaven averages a daily high of 18.9°C with nights around 12.2°C. Expect roughly 13.8 wet days totalling 75.6mm. Generally workable, with some weather to plan around.
October in Wilhelmshaven averages a daily high of 14.3°C with nights around 8.8°C. Expect roughly 16.3 wet days totalling 81.1mm. Demanding conditions — pack for it and plan indoor options.
November in Wilhelmshaven averages a daily high of 9.2°C with nights around 4.8°C. Expect roughly 17.2 wet days totalling 74.2mm. Demanding conditions — pack for it and plan indoor options.
December in Wilhelmshaven averages a daily high of 6.1°C with nights around 2.2°C. Expect roughly 18.6 wet days totalling 77.8mm. 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. Wilhelmshaven peaks at 72.
Based on 30 years of records, May–September scores highest for comfort in Wilhelmshaven, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 21.8°C.
July is the wettest, averaging 95.7mm of rain across roughly 15.3 wet days.
January is the coolest month, with average daily highs around 5.2°C.