AI-generatedCarnac at a glance
- Best time
- Jul – Aug
- Warmest month
- Aug · 20°
- Warmest sea
- Aug · 18.3°
- Sunshine a year
- 1,820 h
- Rain a year
- 831 mm
- Climate
- Maritime
- Time zone
- UTC+1 / UTC+2
- Elevation
- 21 m
Climate in Carnac
Carnac has a maritime climate with moderate summers and cool, often grey winters. August is the warmest month with average highs of 20 °C, while January is the coolest at 9 °C. With around 1,820 hours of sunshine a year, Carnac is moderately sunny; July is the sunniest month with 7.4 hours a day.
Holiday weather through the year
Weather in October
Holiday weather in October
Poor
Best time to visit: July – August
Keep in mindFrequent rain
A typical day in October
- Morning, 08:00: about 13°
- Midday, 13:00: about 15°
- Afternoon, 16:00: about 16°
- Evening, 20:00: about 15°
- Night, 23:00: about 14°
08:2919:27
Cool evenings: pack a jumper or a jacket.
Estimated from the average high and low: coolest around sunrise, warmest in mid-afternoon.
Light for photos in October
- Golden hour
- Morning 08:10–09:11 · evening 18:45–19:46
- Blue hour
- Morning 07:58–08:10 · evening 19:46–19:58
Golden hour: the sun between 4° below and 6° above the horizon; blue hour: 6° to 4° below it. Times for the 15th of the month; mountains and clouds shift the light.
What is the weather like in Carnac in October?
In October, Carnac is mild: daytime highs average 16 °C, and nights cool down to about 13 °C. The sea averages 16.0 °C – swimming is only for the hardy. The sun is scarce, with only about 4 hours a day. Rain is frequent, with about 13 rainy days and 100 mm in total. All in all, October is not an ideal month for a holiday in Carnac.
More details for October
- Daylight
- 10 h 57 min08:29 – 19:27
- UV index
- 3 · moderateclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 28 km/haverage daily peakAll months
- Cloud cover
- 66 %on averageAll months
- Hot days
- 0 days30 °C or more
- Time zone
- UTC+2Europe/Paris
How the score comes together
- Temperatureweight 35 %0 %
- Seaweight 25 %0 %
- Sunshineweight 20 %12 %
- Few rainy daysweight 20 %34 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in October
- A jumper for the evenings
- Rain jacket or umbrella
Sea temperature in Carnac
Monthly sea surface temperature with the range of cooler and warmer years.
8 in 10 years: 15.1 – 16.7 °C
Swimming season: Never above 20 °C
- cold
- fresh
- refreshing
- pleasant
- warm
- very warm
The sea temperature in Carnac ranges from 9.6 °C in February to 18.3 °C in August. Even at its warmest the sea stays below 20 °C, so swimming is bracing at best.
From November to February the sea is even warmer than the afternoon air. The sea temperature varies from year to year: in August, eight out of ten years were between 17.5 and 19.2 °C.
| Month | Average | Cool year | Warm year | Feels |
|---|---|---|---|---|
| JanuaryJan | 10.2° | 9.0° | 11.0° | cold |
| FebruaryFeb | 9.6° | 8.6° | 10.5° | cold |
| MarchMar | 10.1° | 8.9° | 10.8° | cold |
| AprilApr | 11.8° | 11.0° | 12.9° | cold |
| MayMay | 14.0° | 13.2° | 15.2° | cold |
| JuneJun | 16.4° | 15.3° | 17.5° | cold |
| JulyJul | 17.7° | 16.5° | 18.5° | fresh |
| AugustAug | 18.3° | 17.5° | 19.2° | fresh |
| SeptemberSep | 17.4° | 16.1° | 18.4° | fresh |
| OctoberOct | 16.0° | 15.1° | 16.7° | cold |
| NovemberNov | 14.0° | 13.0° | 15.1° | cold |
| DecemberDec | 11.8° | 11.2° | 12.9° | cold |
Sunshine hours in Carnac
Average hours of bright sunshine per day, next to the length of the day. Tap a month to select it.
In October, the sun shines for about 3.7 of 11.0 hours of daylight in Carnac, 34 % of the day.
Sunshine hours: estimated from radiation data (ERA5, 1996–2025) and calibrated against measured station values; no weather station is close enough here. Daylight is the time from sunrise to sunset on the 15th of the month.
UV index in Carnac
How strong the sun is at noon, month by month, and how quickly unprotected skin burns.
- Clear-sky UV in October
- 3 · moderateAround midday seek shade; use sunscreen, a hat and sunglasses.
The sun is strongest in June (UV 8).
Minutes until sunburn in October
- Very fair skin
- about 50 min
- Fair skin
- about 65 min
- Light brown skin
- about 90 min
- Olive skin
- about 115 min
Rough guide for unprotected skin at noon under a clear sky; clouds lengthen it, water, sand and snow shorten it. Sunscreen extends the time only partly.
Monthly values: clear-sky noon estimate from the sun's angle, ozone and altitude. UV today: Open-Meteo forecast.
Rain in Carnac: rainy days and rainfall
A rainy day is a day with at least 1 mm of rain or snow; the amount is what falls in the whole month. Tap a month to select it.
In October, Carnac has about 13 rainy days with 100 mm of rain in total.
Wind and clouds in Carnac
How breezy and how cloudy Carnac is through the year. Tap a month to select it on the whole page.
Wind
Typical daily peak of the wind in km/h: what the afternoon breeze usually reaches, not the gusts.
In October, the wind in Carnac typically peaks at 28 km/h during the day: Beaufort 4, moderate breeze.
Breezy months for windsurfing and kiting
From Beaufort 4 (20 km/h) the daily breeze is usually enough for windsurfing and often for kiting, and here it gets there all year.
Clouds
Average share of the sky covered by cloud, day and night.
In October, cloud covers on average 66 % of the sky over Carnac: mostly cloudy, with about 3.7 hours of sunshine a day.
Wind: mean daily maximum of the hourly wind 10 m above ground (ERA5, 1996–2025). Gusts are stronger, and the model grid of about 28 km smooths out local effects such as capes and valley winds. Clouds: mean total cloud cover of all layers over day and night (ERA5, 1996–2025). Thin high cloud counts as cover even when the sun still shines through.
Climate through the year
Long-term monthly averages. Tap a month to see its details.
Nights and sleep in Carnac
How warm the nights get in each month, from the mean night-time low. Tap a month for details.
- Cold 0–8°
- Cool 8–15°
- Pleasant 15–20°
CoolOctober: nights around 13°. A duvet at night and a jumper for the evening.
The coolest nights are in February (6°), the warmest in August (16°). Nights are pleasant for sleeping (15 to 20 °C) from July to September. Nights fall below 8 °C on average from December to March, so the room should be heated.
Temperatures through the year
Average daytime high, night-time low and sea temperature per month.
| Month | Score | Day | Night | Sea | Sun | Rain days | Rain mm |
|---|---|---|---|---|---|---|---|
| JanuaryJan | 7 | 9° | 6° | 10.2° | 2.2 h | 13 | 95 |
| FebruaryFeb | 11 | 10° | 6° | 9.6° | 3.4 h | 11 | 71 |
| MarchMar | 15 | 11° | 7° | 10.1° | 4.5 h | 11 | 62 |
| AprilApr | 22 | 13° | 9° | 11.8° | 6.2 h | 10 | 61 |
| MayMay | 24 | 16° | 11° | 14.0° | 6.8 h | 10 | 53 |
| JuneJun | 28 | 19° | 14° | 16.4° | 7.3 h | 8 | 45 |
| JulyJul | 39 | 20° | 16° | 17.7° | 7.4 h | 8 | 41 |
| AugustAug | 40 | 20° | 16° | 18.3° | 6.9 h | 8 | 46 |
| SeptemberSep | 27 | 19° | 15° | 17.4° | 6.3 h | 8 | 45 |
| OctoberOct | 9 | 16° | 13° | 16.0° | 3.7 h | 13 | 100 |
| NovemberNov | 6 | 13° | 10° | 14.0° | 2.8 h | 14 | 103 |
| DecemberDec | 6 | 10° | 7° | 11.8° | 2.2 h | 14 | 109 |
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
47.58° N, 3.08° W · 21 m · Europe/Paris
Best time to visit Carnac
The best time to visit Carnac is from July to August. The sea stays too cool for a classic beach holiday: even in August it only reaches 18.3 °C. For sightseeing, day trips and hiking, conditions are most comfortable from May to September. Rain is most frequent from October to January; the wettest month is December with 109 mm.
Carnac through the seasons
How the weather changes over the seasons, with averages for each.
Carnac in spring
Mar – May
Poor
- 11–16 °C by day
- Sea 12 °C
- 6 h of sun a day
- 32 rainy days in all
Carnac in summer
Jun – Aug
Poor
- 19–20 °C by day
- Sea 18 °C
- 7 h of sun a day
- 24 rainy days in all
Carnac in autumn
Sep – Nov
Poor
- 13–19 °C by day
- Sea 16 °C
- 4 h of sun a day
- 35 rainy days in all
Carnac in winter
Dec – Feb
Poor
- 9–10 °C by day
- Sea 11 °C
- 3 h of sun a day
- 38 rainy days in all
Find your perfect month
Tell us what you like and we rate every month in Carnac for you.
Your best months: June – August
Based on the climate averages; tap a month to see its details.
Compare two months in Carnac
Pick two months to see how the weather differs. A tick marks the clearly better value; for temperatures it depends on your plans.
August has the better holiday weather in Carnac: score 40 against 9. In August, days are 4 °C warmer than in October. The sea is 2 °C warmer in August. August has 5 fewer rainy days. The sun shines 3 hours longer a day in August.
| Month | October | August |
|---|---|---|
| Weather score | 9 | 40better |
| Day high | 16° | 20° |
| Night low | 13° | 16° |
| Sea | 16.0° | 18.3° |
| Sunshine | 3.7 h | 6.9 hbetter |
| Rainy days | 13 | 8better |
| Rainfall | 100 mm | 46 mmbetter |
| Muggy days | 0better | 1 |
Based on the climate averages 1996–2025.
Which month for what?
Beach & swimming
No month
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
May – Sep
15–28 °C and not too much rain
Rainy months
Oct – Jan
12 or more rainy days
Carnac month by month
The typical weather for every month at a glance.
7January9° · Sea 10° · 2 h
In January, Carnac is cold: daytime highs average 9 °C, and nights cool down to about 6 °C. The sea averages 10.2 °C – swimming is only for the hardy. The sun is scarce, with only about 2 hours a day. Rain is frequent, with about 13 rainy days and 95 mm in total. It is often windy, with gusts of around 31 km/h. All in all, January is not an ideal month for a holiday in Carnac.
Carnac in January11February10° · Sea 10° · 3 h
In February, Carnac is cold: daytime highs average 10 °C, and nights cool down to about 6 °C. The sea averages 9.6 °C – swimming is only for the hardy. The sun is scarce, with only about 3 hours a day. Rain is frequent, with about 11 rainy days and 71 mm in total. It is often windy, with gusts of around 30 km/h. All in all, February is not an ideal month for a holiday in Carnac.
Carnac in February15March11° · Sea 10° · 5 h
In March, Carnac is cool: daytime highs average 11 °C, and nights cool down to about 7 °C. The sea averages 10.1 °C – swimming is only for the hardy. Expect around 5 hours of sunshine a day. Rain is frequent, with about 11 rainy days and 62 mm in total. All in all, March is not an ideal month for a holiday in Carnac.
Carnac in March22April13° · Sea 12° · 6 h
In April, Carnac is cool: daytime highs average 13 °C, and nights cool down to about 9 °C. The sea averages 11.8 °C – swimming is only for the hardy. Expect around 6 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 61 mm in total. All in all, April is not an ideal month for a holiday in Carnac.
Carnac in April24May16° · Sea 14° · 7 h
In May, Carnac is mild: daytime highs average 16 °C, and nights cool down to about 11 °C. The sea averages 14.0 °C – swimming is only for the hardy. The sun shines for around 7 hours a day. Rain is frequent, with about 10 rainy days and 53 mm in total. All in all, May is not an ideal month for a holiday in Carnac.
Carnac in May28June19° · Sea 16° · 7 h
In June, Carnac is mild: daytime highs average 19 °C, and nights cool down to about 14 °C. The sea averages 16.4 °C – swimming is only for the hardy. The sun shines for around 7 hours a day. Rain falls on about 8 days, adding up to 45 mm. All in all, June is not an ideal month for a holiday in Carnac.
Carnac in June39July20° · Sea 18° · 7 h
In July, Carnac is mild: daytime highs average 20 °C, and nights cool down to about 16 °C. The sea averages 17.7 °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 41 mm. All in all, July is not an ideal month for a holiday in Carnac.
Carnac in July40August20° · Sea 18° · 7 h
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.
Carnac in August27September19° · Sea 17° · 6 h
In September, Carnac is mild: daytime highs average 19 °C, and nights cool down to about 15 °C. The sea averages 17.4 °C – bracing, so a wetsuit helps for longer swims. Expect around 6 hours of sunshine a day. Rain falls on about 8 days, adding up to 45 mm. All in all, September is not an ideal month for a holiday in Carnac.
Carnac in September9October16° · Sea 16° · 4 h
In October, Carnac is mild: daytime highs average 16 °C, and nights cool down to about 13 °C. The sea averages 16.0 °C – swimming is only for the hardy. The sun is scarce, with only about 4 hours a day. Rain is frequent, with about 13 rainy days and 100 mm in total. All in all, October is not an ideal month for a holiday in Carnac.
Carnac in October6November13° · Sea 14° · 3 h
In November, Carnac is cool: daytime highs average 13 °C, and nights cool down to about 10 °C. The sea averages 14.0 °C – swimming is only for the hardy. The sun is scarce, with only about 3 hours a day. Rain is frequent, with about 14 rainy days and 103 mm in total. It is often windy, with gusts of around 30 km/h. All in all, November is not an ideal month for a holiday in Carnac.
Carnac in November6December10° · Sea 12° · 2 h
In December, Carnac is cool: daytime highs average 10 °C, and nights cool down to about 7 °C. The sea averages 11.8 °C – swimming is only for the hardy. The sun is scarce, with only about 2 hours a day. Rain is frequent, with about 14 rainy days and 109 mm in total. It is often windy, with gusts of around 32 km/h. All in all, December is not an ideal month for a holiday in Carnac.
Carnac in DecemberCarnac compared
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Carnac vs. Vannes
In October the holiday weather in Carnac and Vannes is about equally good (score 9 vs. 11). During the day Vannes is 1 °C warmer than Carnac. The sea is about equally warm.
| in October | Carnac | Vannes |
|---|---|---|
| Holiday score | 9 | 11 |
| Daytime high | 16° | 17° |
| Sea | 16° | 16° |
| Sunshine | 4 h | 4 h |
| Rainy days | 13 | 12 |
| Best time | Jul – Aug | Jul – Aug |
Through the year
France in October: the best places
In October, Carnac ranks 25 among the 31 nearest destinations in this country.
- Bordeaux20°18°72
- 2Poitiers18°66
- 3Oradour-sur-Glane17°66
- 4Angers17°65
- 5Tours18°65
- 6Nantes17°63
- 7Orléans17°62
- 8Le Mans17°60
- 25CarnacThis page16°16°9
Planning a trip to Carnac
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
Carnac in the school holidays
How the weather suits the usual holiday periods. Dates vary by school and region, so each holiday uses the months it usually falls in.
Carnac has its best school-holiday weather during the summer holidays (score 40) and its weakest during the Christmas holidays (score 7).
- 20
Easter holidays
Mar – Apr
Poor
- 13 °C by day
- Sea 11 °C
- 5.7 h of sun a day
- 10 rainy days a month
- 25
May half-term
May – Jun
Poor
- 17 °C by day
- Sea 14 °C
- 6.9 h of sun a day
- 10 rainy days a month
Good for: Sightseeing & walks
- 40
Summer holidays
Jul – Aug
FairBest holidays
- 20 °C by day
- Sea 18 °C
- 7.1 h of sun a day
- 8 rainy days a month
Good for: Sightseeing & walks
- 9
October half-term
Oct
Poor
- 16 °C by day
- Sea 16 °C
- 3.7 h of sun a day
- 13 rainy days a month
Keep in mind: Frequent rain
- 7
Christmas holidays
Dec – Jan
Poor
- 10 °C by day
- Sea 11 °C
- 2.2 h of sun a day
- 14 rainy days a month
Keep in mind: Frequent rain
Based on the climate averages 1996–2025.
Getting there
Flying from
- Nonstop flight
- Short trip – train or car is often quicker
- Distance
- 470 km
- Time zone
- UTC+2
- Jet lag
- Hardly any (under 3 h)
Estimated from the straight-line distance: 30 minutes for take-off and landing plus 830 km/h cruising speed.
Frequently asked questions about Carnac
When is the best time to visit Carnac?
The best time to visit Carnac is from July to August. That is when the holiday weather score, which combines temperature, sea, sunshine and rain, is highest.
How warm is the sea in Carnac?
The sea temperature in Carnac ranges from 9.6 °C in February to 18.3 °C in August. Even at its warmest the sea stays below 20 °C, so swimming is bracing at best.
Can you swim in Carnac in October?
Only if you don't mind cold water: in October the sea averages just 16.0 °C. Comfortable swimming temperatures are not reached at any time of year.
What is the warmest month in Carnac?
August is the warmest month, with average highs of 20 °C and nights around 16 °C. January is the coolest month at 9 °C.
When does it rain most in Carnac?
Rain is most frequent from October to January; the wettest month is December with 109 mm. The driest month is July with 41 mm.
How many hours of sunshine does Carnac get?
Carnac gets around 1,820 hours of sunshine a year. The sunniest month is July with 7.4 hours a day; in January there are 2.2 hours a day.
What time zone is Carnac in?
Carnac uses the time zone Europe/Paris: UTC+1 in January and UTC+2 in July.
Which school holidays are best for Carnac?
Carnac has its best school-holiday weather during the summer holidays (score 40) and its weakest during the Christmas holidays (score 7). Holiday ratings (0–100): Easter holidays 20, May half-term 25, Summer holidays 40, October half-term 9, Christmas holidays 7.
Near Carnac
Other destinations close by.
Places with a climate like Carnac
Destinations whose weather through the year is closest to Carnac's – good alternatives.