| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | -1.9° | -6.2° | 45.1mm | 15.6 | 3 |
| February | -2.4° | -7.2° | 45.9mm | 13.1 | 5 |
| March | 0.8° | -4.7° | 32.7mm | 10.2 | 15 |
| April | 6.2° | 0.3° | 27.2mm | 8.7 | 36 |
| May | 12.6° | 5.9° | 34.7mm | 8 | 60 |
| June | 17.9° | 11.5° | 44.6mm | 9.9 | 73 |
| July | 21.3° | 15.1° | 46.8mm | 10.1 | 80 |
| August | 20.3° | 14.7° | 51.2mm | 10.1 | 80 |
| September | 15.2° | 10.5° | 46.9mm | 10.2 | 64 |
| October | 9.1° | 5.4° | 66.9mm | 13.8 | 38 |
| November | 4.4° | 1° | 62.9mm | 15.8 | 19 |
| December | 0.8° | -3.1° | 52mm | 15.7 | 7 |
January in Kotka averages a daily high of -1.9°C with nights around -6.2°C. Expect roughly 15.6 wet days totalling 45.1mm. A hard month to visit for comfort alone.
February in Kotka averages a daily high of -2.4°C with nights around -7.2°C. Expect roughly 13.1 wet days totalling 45.9mm. A hard month to visit for comfort alone.
March in Kotka averages a daily high of 0.8°C with nights around -4.7°C. Expect roughly 10.2 wet days totalling 32.7mm. A hard month to visit for comfort alone.
April in Kotka averages a daily high of 6.2°C with nights around 0.3°C. Expect roughly 8.7 wet days totalling 27.2mm. Demanding conditions — pack for it and plan indoor options.
May in Kotka averages a daily high of 12.6°C with nights around 5.9°C. Expect roughly 8 wet days totalling 34.7mm. Generally workable, with some weather to plan around.
June in Kotka averages a daily high of 17.9°C with nights around 11.5°C. Expect roughly 9.9 wet days totalling 44.6mm. Generally workable, with some weather to plan around.
July in Kotka averages a daily high of 21.3°C with nights around 15.1°C. Expect roughly 10.1 wet days totalling 46.8mm. Comfortable conditions for being outdoors all day.
August in Kotka averages a daily high of 20.3°C with nights around 14.7°C. Expect roughly 10.1 wet days totalling 51.2mm. Comfortable conditions for being outdoors all day.
September in Kotka averages a daily high of 15.2°C with nights around 10.5°C. Expect roughly 10.2 wet days totalling 46.9mm. Generally workable, with some weather to plan around.
October in Kotka averages a daily high of 9.1°C with nights around 5.4°C. Expect roughly 13.8 wet days totalling 66.9mm. Demanding conditions — pack for it and plan indoor options.
November in Kotka averages a daily high of 4.4°C with nights around 1°C. Expect roughly 15.8 wet days totalling 62.9mm. A hard month to visit for comfort alone.
December in Kotka averages a daily high of 0.8°C with nights around -3.1°C. Expect roughly 15.7 wet days totalling 52mm. 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. Kotka peaks at 80.
Based on 30 years of records, June–August scores highest for comfort in Kotka, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 21.3°C.
October is the wettest, averaging 66.9mm of rain across roughly 13.8 wet days.
February is the coolest month, with average daily highs around -2.4°C.