| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 9.4° | 3.3° | 87mm | 15.4 | 36 |
| February | 10.8° | 3.5° | 67.1mm | 12.7 | 45 |
| March | 13.6° | 4.9° | 61.6mm | 12.5 | 55 |
| April | 16.5° | 6.7° | 55.2mm | 11.4 | 66 |
| May | 19.8° | 9.9° | 63mm | 12.1 | 75 |
| June | 23.4° | 12.9° | 49.7mm | 9.8 | 80 |
| July | 25.3° | 14.4° | 46.1mm | 10 | 80 |
| August | 25.4° | 14.3° | 49.4mm | 9.7 | 81 |
| September | 22.8° | 12° | 55.2mm | 10.3 | 79 |
| October | 18.2° | 9.8° | 92.9mm | 14.7 | 65 |
| November | 13° | 6° | 96.8mm | 16 | 48 |
| December | 10° | 3.7° | 100.2mm | 15.9 | 38 |
January in La Roche-sur-Yon averages a daily high of 9.4°C with nights around 3.3°C. Expect roughly 15.4 wet days totalling 87mm. Demanding conditions — pack for it and plan indoor options.
February in La Roche-sur-Yon averages a daily high of 10.8°C with nights around 3.5°C. Expect roughly 12.7 wet days totalling 67.1mm. Demanding conditions — pack for it and plan indoor options.
March in La Roche-sur-Yon averages a daily high of 13.6°C with nights around 4.9°C. Expect roughly 12.5 wet days totalling 61.6mm. Generally workable, with some weather to plan around.
April in La Roche-sur-Yon averages a daily high of 16.5°C with nights around 6.7°C. Expect roughly 11.4 wet days totalling 55.2mm. Generally workable, with some weather to plan around.
May in La Roche-sur-Yon averages a daily high of 19.8°C with nights around 9.9°C. Expect roughly 12.1 wet days totalling 63mm. Comfortable conditions for being outdoors all day.
June in La Roche-sur-Yon averages a daily high of 23.4°C with nights around 12.9°C. Expect roughly 9.8 wet days totalling 49.7mm. Comfortable conditions for being outdoors all day.
July in La Roche-sur-Yon averages a daily high of 25.3°C with nights around 14.4°C. Expect roughly 10 wet days totalling 46.1mm. Comfortable conditions for being outdoors all day.
August in La Roche-sur-Yon averages a daily high of 25.4°C with nights around 14.3°C. Expect roughly 9.7 wet days totalling 49.4mm. Comfortable conditions for being outdoors all day.
September in La Roche-sur-Yon averages a daily high of 22.8°C with nights around 12°C. Expect roughly 10.3 wet days totalling 55.2mm. Comfortable conditions for being outdoors all day.
October in La Roche-sur-Yon averages a daily high of 18.2°C with nights around 9.8°C. Expect roughly 14.7 wet days totalling 92.9mm. Generally workable, with some weather to plan around.
November in La Roche-sur-Yon averages a daily high of 13°C with nights around 6°C. Expect roughly 16 wet days totalling 96.8mm. Demanding conditions — pack for it and plan indoor options.
December in La Roche-sur-Yon averages a daily high of 10°C with nights around 3.7°C. Expect roughly 15.9 wet days totalling 100.2mm. Demanding conditions — pack for it and plan indoor options.
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. La Roche-sur-Yon peaks at 81.
Based on 30 years of records, May–September scores highest for comfort in La Roche-sur-Yon, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 25.4°C.
December is the wettest, averaging 100.2mm of rain across roughly 15.9 wet days.
January is the coolest month, with average daily highs around 9.4°C.