| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | -0.3° | -8.1° | 101.4mm | 17 | 0 |
| February | 1.8° | -7.1° | 92.6mm | 15.7 | 1 |
| March | 5.7° | -4.6° | 91mm | 15.5 | 14 |
| April | 12.5° | -0.3° | 66.1mm | 13.1 | 46 |
| May | 17.3° | 4.5° | 114.8mm | 16.8 | 61 |
| June | 20.8° | 8.3° | 118.5mm | 16 | 70 |
| July | 22.4° | 9.7° | 150.1mm | 16.3 | 70 |
| August | 22.6° | 9.1° | 105.1mm | 12.6 | 75 |
| September | 17.1° | 5.4° | 100.4mm | 13.2 | 64 |
| October | 12.1° | 2° | 90.6mm | 14.6 | 46 |
| November | 6.1° | -1.4° | 88.4mm | 14.3 | 22 |
| December | 0.6° | -6.4° | 82.3mm | 16 | 2 |
January in Bielsko-Biala averages a daily high of -0.3°C with nights around -8.1°C. Expect roughly 17 wet days totalling 101.4mm. A hard month to visit for comfort alone.
February in Bielsko-Biala averages a daily high of 1.8°C with nights around -7.1°C. Expect roughly 15.7 wet days totalling 92.6mm. A hard month to visit for comfort alone.
March in Bielsko-Biala averages a daily high of 5.7°C with nights around -4.6°C. Expect roughly 15.5 wet days totalling 91mm. A hard month to visit for comfort alone.
April in Bielsko-Biala averages a daily high of 12.5°C with nights around -0.3°C. Expect roughly 13.1 wet days totalling 66.1mm. Demanding conditions — pack for it and plan indoor options.
May in Bielsko-Biala averages a daily high of 17.3°C with nights around 4.5°C. Expect roughly 16.8 wet days totalling 114.8mm. Generally workable, with some weather to plan around.
June in Bielsko-Biala averages a daily high of 20.8°C with nights around 8.3°C. Expect roughly 16 wet days totalling 118.5mm. Generally workable, with some weather to plan around.
July in Bielsko-Biala averages a daily high of 22.4°C with nights around 9.7°C. Expect roughly 16.3 wet days totalling 150.1mm. Generally workable, with some weather to plan around.
August in Bielsko-Biala averages a daily high of 22.6°C with nights around 9.1°C. Expect roughly 12.6 wet days totalling 105.1mm. Comfortable conditions for being outdoors all day.
September in Bielsko-Biala averages a daily high of 17.1°C with nights around 5.4°C. Expect roughly 13.2 wet days totalling 100.4mm. Generally workable, with some weather to plan around.
October in Bielsko-Biala averages a daily high of 12.1°C with nights around 2°C. Expect roughly 14.6 wet days totalling 90.6mm. Demanding conditions — pack for it and plan indoor options.
November in Bielsko-Biala averages a daily high of 6.1°C with nights around -1.4°C. Expect roughly 14.3 wet days totalling 88.4mm. A hard month to visit for comfort alone.
December in Bielsko-Biala averages a daily high of 0.6°C with nights around -6.4°C. Expect roughly 16 wet days totalling 82.3mm. 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. Bielsko-Biala peaks at 75.
Based on 30 years of records, June–August scores highest for comfort in Bielsko-Biala, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 22.6°C.
July is the wettest, averaging 150.1mm of rain across roughly 16.3 wet days.
January is the coolest month, with average daily highs around -0.3°C.