| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | -3.7° | -9.3° | 54.5mm | 17.7 | 0 |
| February | -3.2° | -9.5° | 49.5mm | 14.5 | 1 |
| March | 1.6° | -6.4° | 38.5mm | 11.4 | 10 |
| April | 8.7° | -0.8° | 31.1mm | 10 | 40 |
| May | 16.2° | 4.9° | 42.9mm | 10.1 | 68 |
| June | 21° | 10.3° | 65mm | 12.4 | 75 |
| July | 23.3° | 13.2° | 74mm | 12.1 | 76 |
| August | 21.3° | 11.8° | 69.5mm | 12 | 76 |
| September | 15.3° | 7.3° | 59.4mm | 11.7 | 62 |
| October | 8° | 2.3° | 73.7mm | 15.6 | 32 |
| November | 2.4° | -1.9° | 65.3mm | 17.7 | 9 |
| December | -1.5° | -6.5° | 65mm | 19.1 | 2 |
January in Kouvola averages a daily high of -3.7°C with nights around -9.3°C. Expect roughly 17.7 wet days totalling 54.5mm. A hard month to visit for comfort alone.
February in Kouvola averages a daily high of -3.2°C with nights around -9.5°C. Expect roughly 14.5 wet days totalling 49.5mm. A hard month to visit for comfort alone.
March in Kouvola averages a daily high of 1.6°C with nights around -6.4°C. Expect roughly 11.4 wet days totalling 38.5mm. A hard month to visit for comfort alone.
April in Kouvola averages a daily high of 8.7°C with nights around -0.8°C. Expect roughly 10 wet days totalling 31.1mm. Demanding conditions — pack for it and plan indoor options.
May in Kouvola averages a daily high of 16.2°C with nights around 4.9°C. Expect roughly 10.1 wet days totalling 42.9mm. Generally workable, with some weather to plan around.
June in Kouvola averages a daily high of 21°C with nights around 10.3°C. Expect roughly 12.4 wet days totalling 65mm. Comfortable conditions for being outdoors all day.
July in Kouvola averages a daily high of 23.3°C with nights around 13.2°C. Expect roughly 12.1 wet days totalling 74mm. Comfortable conditions for being outdoors all day.
August in Kouvola averages a daily high of 21.3°C with nights around 11.8°C. Expect roughly 12 wet days totalling 69.5mm. Comfortable conditions for being outdoors all day.
September in Kouvola averages a daily high of 15.3°C with nights around 7.3°C. Expect roughly 11.7 wet days totalling 59.4mm. Generally workable, with some weather to plan around.
October in Kouvola averages a daily high of 8°C with nights around 2.3°C. Expect roughly 15.6 wet days totalling 73.7mm. A hard month to visit for comfort alone.
November in Kouvola averages a daily high of 2.4°C with nights around -1.9°C. Expect roughly 17.7 wet days totalling 65.3mm. A hard month to visit for comfort alone.
December in Kouvola averages a daily high of -1.5°C with nights around -6.5°C. Expect roughly 19.1 wet days totalling 65mm. 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. Kouvola peaks at 76.
Based on 30 years of records, May–August scores highest for comfort in Kouvola, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 23.3°C.
July is the wettest, averaging 74mm of rain across roughly 12.1 wet days.
January is the coolest month, with average daily highs around -3.7°C.