| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 3.2° | -0.2° | 35.5mm | 13.9 | 15 |
| February | 3.5° | -0.3° | 28mm | 11.8 | 20 |
| March | 5.9° | 1° | 24mm | 10.3 | 33 |
| April | 10.3° | 4° | 22.1mm | 8.2 | 53 |
| May | 15.4° | 9° | 28.8mm | 9.5 | 66 |
| June | 19.9° | 13.4° | 44.5mm | 9.3 | 81 |
| July | 21.7° | 15.6° | 56.1mm | 11 | 78 |
| August | 21.3° | 15.6° | 52.2mm | 9.8 | 80 |
| September | 17.8° | 12.5° | 38.9mm | 9.4 | 74 |
| October | 12.5° | 8.5° | 43.9mm | 10.8 | 54 |
| November | 8.1° | 4.8° | 38.1mm | 13.2 | 36 |
| December | 4.7° | 1.3° | 30.8mm | 13.3 | 23 |
January in Karlskrona averages a daily high of 3.2°C with nights around -0.2°C. Expect roughly 13.9 wet days totalling 35.5mm. A hard month to visit for comfort alone.
February in Karlskrona averages a daily high of 3.5°C with nights around -0.3°C. Expect roughly 11.8 wet days totalling 28mm. A hard month to visit for comfort alone.
March in Karlskrona averages a daily high of 5.9°C with nights around 1°C. Expect roughly 10.3 wet days totalling 24mm. A hard month to visit for comfort alone.
April in Karlskrona averages a daily high of 10.3°C with nights around 4°C. Expect roughly 8.2 wet days totalling 22.1mm. Demanding conditions — pack for it and plan indoor options.
May in Karlskrona averages a daily high of 15.4°C with nights around 9°C. Expect roughly 9.5 wet days totalling 28.8mm. Generally workable, with some weather to plan around.
June in Karlskrona averages a daily high of 19.9°C with nights around 13.4°C. Expect roughly 9.3 wet days totalling 44.5mm. Comfortable conditions for being outdoors all day.
July in Karlskrona averages a daily high of 21.7°C with nights around 15.6°C. Expect roughly 11 wet days totalling 56.1mm. Comfortable conditions for being outdoors all day.
August in Karlskrona averages a daily high of 21.3°C with nights around 15.6°C. Expect roughly 9.8 wet days totalling 52.2mm. Comfortable conditions for being outdoors all day.
September in Karlskrona averages a daily high of 17.8°C with nights around 12.5°C. Expect roughly 9.4 wet days totalling 38.9mm. Generally workable, with some weather to plan around.
October in Karlskrona averages a daily high of 12.5°C with nights around 8.5°C. Expect roughly 10.8 wet days totalling 43.9mm. Demanding conditions — pack for it and plan indoor options.
November in Karlskrona averages a daily high of 8.1°C with nights around 4.8°C. Expect roughly 13.2 wet days totalling 38.1mm. Demanding conditions — pack for it and plan indoor options.
December in Karlskrona averages a daily high of 4.7°C with nights around 1.3°C. Expect roughly 13.3 wet days totalling 30.8mm. 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. Karlskrona peaks at 81.
Based on 30 years of records, June–September scores highest for comfort in Karlskrona, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 21.7°C.
July is the wettest, averaging 56.1mm of rain across roughly 11 wet days.
January is the coolest month, with average daily highs around 3.2°C.