| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 2.6° | -1.5° | 45.3mm | 15.8 | 10 |
| February | 3.7° | -1.6° | 35.9mm | 13.9 | 15 |
| March | 6.2° | -1.7° | 30.8mm | 11.6 | 27 |
| April | 11.3° | 2.2° | 28.4mm | 8.9 | 54 |
| May | 15.9° | 6.4° | 47.9mm | 10.6 | 66 |
| June | 19.5° | 10.6° | 41.8mm | 10 | 78 |
| July | 21.6° | 12.7° | 77.3mm | 12.8 | 74 |
| August | 21.9° | 12.5° | 84.5mm | 14 | 72 |
| September | 18.3° | 10.1° | 74.1mm | 13.3 | 68 |
| October | 13.2° | 5.4° | 75.8mm | 15.1 | 48 |
| November | 7.5° | 2° | 59.3mm | 15.4 | 30 |
| December | 3.8° | -0.9° | 50.9mm | 16.9 | 14 |
January in Słupsk averages a daily high of 2.6°C with nights around -1.5°C. Expect roughly 15.8 wet days totalling 45.3mm. A hard month to visit for comfort alone.
February in Słupsk averages a daily high of 3.7°C with nights around -1.6°C. Expect roughly 13.9 wet days totalling 35.9mm. A hard month to visit for comfort alone.
March in Słupsk averages a daily high of 6.2°C with nights around -1.7°C. Expect roughly 11.6 wet days totalling 30.8mm. A hard month to visit for comfort alone.
April in Słupsk averages a daily high of 11.3°C with nights around 2.2°C. Expect roughly 8.9 wet days totalling 28.4mm. Demanding conditions — pack for it and plan indoor options.
May in Słupsk averages a daily high of 15.9°C with nights around 6.4°C. Expect roughly 10.6 wet days totalling 47.9mm. Generally workable, with some weather to plan around.
June in Słupsk averages a daily high of 19.5°C with nights around 10.6°C. Expect roughly 10 wet days totalling 41.8mm. Comfortable conditions for being outdoors all day.
July in Słupsk averages a daily high of 21.6°C with nights around 12.7°C. Expect roughly 12.8 wet days totalling 77.3mm. Generally workable, with some weather to plan around.
August in Słupsk averages a daily high of 21.9°C with nights around 12.5°C. Expect roughly 14 wet days totalling 84.5mm. Generally workable, with some weather to plan around.
September in Słupsk averages a daily high of 18.3°C with nights around 10.1°C. Expect roughly 13.3 wet days totalling 74.1mm. Generally workable, with some weather to plan around.
October in Słupsk averages a daily high of 13.2°C with nights around 5.4°C. Expect roughly 15.1 wet days totalling 75.8mm. Demanding conditions — pack for it and plan indoor options.
November in Słupsk averages a daily high of 7.5°C with nights around 2°C. Expect roughly 15.4 wet days totalling 59.3mm. A hard month to visit for comfort alone.
December in Słupsk averages a daily high of 3.8°C with nights around -0.9°C. Expect roughly 16.9 wet days totalling 50.9mm. 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. Słupsk peaks at 78.
Based on 30 years of records, June–August scores highest for comfort in Słupsk, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 21.9°C.
August is the wettest, averaging 84.5mm of rain across roughly 14 wet days.
January is the coolest month, with average daily highs around 2.6°C.