Carnac weather in August
Temperature, sea and sunshine in August: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in August
Fair
Best time to visit: July – August
What is the weather like in Carnac in August?
In August, Carnac is mild: daytime highs average 20 °C, and nights cool down to about 16 °C. The sea averages 18.3 °C – bracing, so a wetsuit helps for longer swims. The sun shines for around 7 hours a day. Rain falls on about 8 days, adding up to 46 mm. All in all, August is a so-so month for a holiday in Carnac.
August compared
How the weather changes from July to September. Tap a month to open it.
| JulyJul | AugustAug | SeptemberSep | |
|---|---|---|---|
| Score | 39 | 40 | 27 |
| Day | 20° | 20° | 19° |
| Night | 16° | 16° | 15° |
| Sea | 18° | 18° | 17° |
| Sun | 7 h | 7 h | 6 h |
| Rain days | 8 | 8 | 8 |
More details for August
- Daylight
- 14 h 20 min07:07 – 21:27
- UV index
- 7 · highclear sky, noon (estimate)All months
- Muggy days
- 1 daydew point 18 °C or moreAll months
- Wind
- 23 km/haverage daily peakAll months
- Cloud cover
- 55 %on averageAll months
- Hot days
- 0 days30 °C or more
- Time zone
- UTC+2Europe/Paris
How the score comes together
- Temperatureweight 35 %23 %
- Seaweight 25 %19 %
- Sunshineweight 20 %65 %
- Few rainy daysweight 20 %71 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in August
- Wetsuit for longer swims
- Sunscreen
- Sunglasses & sun hat
- Rain jacket or umbrella
Carnac in August: quick answers
Is Carnac hot in August?
No. In August, Carnac is mild: daytime highs average 20 °C and nights drop to about 16 °C.
Can you swim in Carnac in August?
Only if you don't mind cold water: in August the sea averages just 18.3 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Carnac in August?
Rain falls on about 8 days, adding up to 46 mm.
Carnac month by month
The whole year in CarnacAll destinations: FranceWhere to go in AugustSea temperature in August
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