| 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 Lausanne 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 Lausanne 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 Lausanne 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 Lausanne 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 Lausanne 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 Lausanne 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 Lausanne 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 Lausanne 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 Lausanne 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 Lausanne 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 Lausanne 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 Lausanne 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. Lausanne peaks at 80.
Based on 30 years of records, June–September scores highest for comfort in Lausanne, 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.