Cassis weather in December
Temperature, sea and sunshine in December: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in December
Poor
Best time to visit: July – August
What is the weather like in Cassis in December?
In December, Cassis is cool: daytime highs average 12 °C, and nights cool down to about 8 °C. The sea averages 15.2 °C – swimming is only for the hardy. Expect around 5 hours of sunshine a day. Rain falls on about 7 days, adding up to 57 mm. All in all, December is not an ideal month for a holiday in Cassis.
December compared
How the weather changes from November to January. Tap a month to open it.
| NovemberNov | DecemberDec | JanuaryJan | |
|---|---|---|---|
| Score | 20 | 20 | 22 |
| Day | 15° | 12° | 11° |
| Night | 11° | 8° | 7° |
| Sea | 17° | 15° | 14° |
| Sun | 5 h | 5 h | 5 h |
| Rain days | 10 | 7 | 7 |
More details for December
- Daylight
- 9 h 1 min08:03 – 17:03
- UV index
- 1 · lowclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 19 km/haverage daily peakAll months
- Cloud cover
- 52 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Time zone
- UTC+1Europe/Paris
How the score comes together
- Temperatureweight 35 %0 %
- Seaweight 25 %0 %
- Sunshineweight 20 %25 %
- Few rainy daysweight 20 %77 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in December
- A jumper for the evenings
Cassis in December: quick answers
Is Cassis hot in December?
No. In December, Cassis is cool: daytime highs average 12 °C and nights drop to about 8 °C.
Can you swim in Cassis in December?
Only if you don't mind cold water: in December the sea averages just 15.2 °C. Comfortable swimming is possible from June to September.
Does it rain much in Cassis in December?
Rain falls on about 7 days, adding up to 57 mm.
Cassis month by month
The whole year in CassisAll destinations: FranceWhere to go in DecemberSea temperature in December
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences