| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 0.3° | -5.5° | 52.6mm | 13.8 | 6 |
| February | 2.2° | -5° | 41.7mm | 12 | 11 |
| March | 6.6° | -2.6° | 37.7mm | 11.5 | 27 |
| April | 11.6° | 1.2° | 32.8mm | 10.7 | 51 |
| May | 16.9° | 5.6° | 67.1mm | 14.1 | 62 |
| June | 20.8° | 9.7° | 76.3mm | 14.3 | 71 |
| July | 22.7° | 11.9° | 93.1mm | 17.8 | 70 |
| August | 21.5° | 11° | 103.4mm | 15.7 | 70 |
| September | 17.2° | 8° | 104.1mm | 13.6 | 64 |
| October | 10.3° | 3.2° | 86mm | 13.3 | 42 |
| November | 4.6° | -0.7° | 68.3mm | 13.6 | 19 |
| December | 0.6° | -4.6° | 54mm | 14.1 | 7 |
January in Skien averages a daily high of 0.3°C with nights around -5.5°C. Expect roughly 13.8 wet days totalling 52.6mm. A hard month to visit for comfort alone.
February in Skien averages a daily high of 2.2°C with nights around -5°C. Expect roughly 12 wet days totalling 41.7mm. A hard month to visit for comfort alone.
March in Skien averages a daily high of 6.6°C with nights around -2.6°C. Expect roughly 11.5 wet days totalling 37.7mm. A hard month to visit for comfort alone.
April in Skien averages a daily high of 11.6°C with nights around 1.2°C. Expect roughly 10.7 wet days totalling 32.8mm. Demanding conditions — pack for it and plan indoor options.
May in Skien averages a daily high of 16.9°C with nights around 5.6°C. Expect roughly 14.1 wet days totalling 67.1mm. Generally workable, with some weather to plan around.
June in Skien averages a daily high of 20.8°C with nights around 9.7°C. Expect roughly 14.3 wet days totalling 76.3mm. Generally workable, with some weather to plan around.
July in Skien averages a daily high of 22.7°C with nights around 11.9°C. Expect roughly 17.8 wet days totalling 93.1mm. Generally workable, with some weather to plan around.
August in Skien averages a daily high of 21.5°C with nights around 11°C. Expect roughly 15.7 wet days totalling 103.4mm. Generally workable, with some weather to plan around.
September in Skien averages a daily high of 17.2°C with nights around 8°C. Expect roughly 13.6 wet days totalling 104.1mm. Generally workable, with some weather to plan around.
October in Skien averages a daily high of 10.3°C with nights around 3.2°C. Expect roughly 13.3 wet days totalling 86mm. Demanding conditions — pack for it and plan indoor options.
November in Skien averages a daily high of 4.6°C with nights around -0.7°C. Expect roughly 13.6 wet days totalling 68.3mm. A hard month to visit for comfort alone.
December in Skien averages a daily high of 0.6°C with nights around -4.6°C. Expect roughly 14.1 wet days totalling 54mm. 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. Skien peaks at 71.
Based on 30 years of records, June–September scores highest for comfort in Skien, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 22.7°C.
September is the wettest, averaging 104.1mm of rain across roughly 13.6 wet days.
January is the coolest month, with average daily highs around 0.3°C.