| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 12.1° | 6.5° | 65mm | 10.8 | 53 |
| February | 12.4° | 5.9° | 37.5mm | 8.4 | 59 |
| March | 15° | 8.1° | 38.2mm | 8.5 | 67 |
| April | 17.7° | 10.4° | 48.5mm | 9.1 | 74 |
| May | 21.3° | 13.7° | 37.3mm | 8 | 84 |
| June | 25.6° | 17.4° | 16.3mm | 4.7 | 91 |
| July | 28.2° | 19.8° | 6.9mm | 3.4 | 88 |
| August | 28.3° | 20° | 7.7mm | 3 | 89 |
| September | 24.3° | 16.6° | 47.8mm | 6.1 | 88 |
| October | 20.4° | 13.9° | 81.8mm | 10.3 | 79 |
| November | 15.6° | 9.6° | 94.8mm | 12 | 62 |
| December | 12.8° | 7.3° | 69.6mm | 10.8 | 55 |
January in La Seyne-sur-Mer averages a daily high of 12.1°C with nights around 6.5°C. Expect roughly 10.8 wet days totalling 65mm. Demanding conditions — pack for it and plan indoor options.
February in La Seyne-sur-Mer averages a daily high of 12.4°C with nights around 5.9°C. Expect roughly 8.4 wet days totalling 37.5mm. Generally workable, with some weather to plan around.
March in La Seyne-sur-Mer averages a daily high of 15°C with nights around 8.1°C. Expect roughly 8.5 wet days totalling 38.2mm. Generally workable, with some weather to plan around.
April in La Seyne-sur-Mer averages a daily high of 17.7°C with nights around 10.4°C. Expect roughly 9.1 wet days totalling 48.5mm. Generally workable, with some weather to plan around.
May in La Seyne-sur-Mer averages a daily high of 21.3°C with nights around 13.7°C. Expect roughly 8 wet days totalling 37.3mm. Comfortable conditions for being outdoors all day.
June in La Seyne-sur-Mer averages a daily high of 25.6°C with nights around 17.4°C. Expect roughly 4.7 wet days totalling 16.3mm. Comfortable conditions for being outdoors all day.
July in La Seyne-sur-Mer averages a daily high of 28.2°C with nights around 19.8°C. Expect roughly 3.4 wet days totalling 6.9mm. Comfortable conditions for being outdoors all day.
August in La Seyne-sur-Mer averages a daily high of 28.3°C with nights around 20°C. Expect roughly 3 wet days totalling 7.7mm. Comfortable conditions for being outdoors all day.
September in La Seyne-sur-Mer averages a daily high of 24.3°C with nights around 16.6°C. Expect roughly 6.1 wet days totalling 47.8mm. Comfortable conditions for being outdoors all day.
October in La Seyne-sur-Mer averages a daily high of 20.4°C with nights around 13.9°C. Expect roughly 10.3 wet days totalling 81.8mm. Comfortable conditions for being outdoors all day.
November in La Seyne-sur-Mer averages a daily high of 15.6°C with nights around 9.6°C. Expect roughly 12 wet days totalling 94.8mm. Generally workable, with some weather to plan around.
December in La Seyne-sur-Mer averages a daily high of 12.8°C with nights around 7.3°C. Expect roughly 10.8 wet days totalling 69.6mm. Generally workable, with some weather to plan around.
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 Seyne-sur-Mer peaks at 91.
Based on 30 years of records, May–September scores highest for comfort in La Seyne-sur-Mer, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 28.3°C.
November is the wettest, averaging 94.8mm of rain across roughly 12 wet days.
January is the coolest month, with average daily highs around 12.1°C.