| 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 Nantes 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 Nantes 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 Nantes 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 Nantes 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 Nantes 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 Nantes 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 Nantes 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 Nantes 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 Nantes 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 Nantes 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 Nantes 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 Nantes 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. Nantes peaks at 81.
Based on 30 years of records, May–September scores highest for comfort in Nantes, 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.