| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 3.9° | -1.7° | 53mm | 11.2 | 21 |
| February | 6.3° | -1.5° | 43.1mm | 9.8 | 31 |
| March | 10.9° | 0.8° | 53.2mm | 10.7 | 48 |
| April | 15.1° | 3.7° | 60.9mm | 10.6 | 63 |
| May | 19.2° | 8.1° | 85.4mm | 13.8 | 70 |
| June | 23.6° | 11.8° | 83.8mm | 11.8 | 76 |
| July | 25.7° | 13.4° | 93.2mm | 11.8 | 76 |
| August | 25° | 13.3° | 88.9mm | 11.6 | 77 |
| September | 20.2° | 9.7° | 71.5mm | 9.9 | 80 |
| October | 14.9° | 6.4° | 83.7mm | 11.8 | 60 |
| November | 8.1° | 1.8° | 68.8mm | 11.8 | 38 |
| December | 4.4° | -1° | 66mm | 12.2 | 21 |
January in Biel/Bienne averages a daily high of 3.9°C with nights around -1.7°C. Expect roughly 11.2 wet days totalling 53mm. A hard month to visit for comfort alone.
February in Biel/Bienne averages a daily high of 6.3°C with nights around -1.5°C. Expect roughly 9.8 wet days totalling 43.1mm. A hard month to visit for comfort alone.
March in Biel/Bienne averages a daily high of 10.9°C with nights around 0.8°C. Expect roughly 10.7 wet days totalling 53.2mm. Demanding conditions — pack for it and plan indoor options.
April in Biel/Bienne averages a daily high of 15.1°C with nights around 3.7°C. Expect roughly 10.6 wet days totalling 60.9mm. Generally workable, with some weather to plan around.
May in Biel/Bienne averages a daily high of 19.2°C with nights around 8.1°C. Expect roughly 13.8 wet days totalling 85.4mm. Generally workable, with some weather to plan around.
June in Biel/Bienne averages a daily high of 23.6°C with nights around 11.8°C. Expect roughly 11.8 wet days totalling 83.8mm. Comfortable conditions for being outdoors all day.
July in Biel/Bienne averages a daily high of 25.7°C with nights around 13.4°C. Expect roughly 11.8 wet days totalling 93.2mm. Comfortable conditions for being outdoors all day.
August in Biel/Bienne averages a daily high of 25°C with nights around 13.3°C. Expect roughly 11.6 wet days totalling 88.9mm. Comfortable conditions for being outdoors all day.
September in Biel/Bienne averages a daily high of 20.2°C with nights around 9.7°C. Expect roughly 9.9 wet days totalling 71.5mm. Comfortable conditions for being outdoors all day.
October in Biel/Bienne averages a daily high of 14.9°C with nights around 6.4°C. Expect roughly 11.8 wet days totalling 83.7mm. Generally workable, with some weather to plan around.
November in Biel/Bienne averages a daily high of 8.1°C with nights around 1.8°C. Expect roughly 11.8 wet days totalling 68.8mm. Demanding conditions — pack for it and plan indoor options.
December in Biel/Bienne averages a daily high of 4.4°C with nights around -1°C. Expect roughly 12.2 wet days totalling 66mm. 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. Biel/Bienne peaks at 80.
Based on 30 years of records, June–September scores highest for comfort in Biel/Bienne, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 25.7°C.
July is the wettest, averaging 93.2mm of rain across roughly 11.8 wet days.
January is the coolest month, with average daily highs around 3.9°C.