LʼÎle-dʼOlonne Temperature by Month

LʼÎle-dʼOlonne in Pays de la Loire, France sees significant seasonal temperature differences, with daytime highs between 11°C (52°F) in January and 23°C (73°F) in August, averaging 17°C (63°F) annually. Explore the full monthly breakdown below.

In LʼÎle-dʼOlonne, temperatures differ significantly between summer and winter months. Nighttime lows reflect this range, dropping from 17°C (63°F) in August to 6°C (43°F) in January.

The chart below illustrates the average maximum day and minimum night temperatures in LʼÎle-dʼOlonne by month:

From around 4 AM to 6 AM temperatures are at their lowest; by 3 PM they've climbed to their daily peak. August, the warmest month, averages 261 hours of sunshine.

The chart below shows the average temperature throughout the year:

LʼÎle-dʼOlonne's average annual maximum temperature is 17°C (63°F). To put that in context, here's how it compares to a few well-known destinations:

Barcelona, Spain has an annual average of around 21°C (70°F), with warm summers and mild, fairly short winters.

Interlaken, Switzerland averages 8°C (46°F) a year, with cold winters and cool summers thanks to its Alpine setting.

Buenos Aires, Argentina averages 23°C (73°F) a year, with hot summers and mild winters, and seasons reversed compared to Europe.

Adelaide, Australia averages 21°C (70°F) a year, with warm summers, mild winters, and relatively low rainfall year-round.

Temperature alone doesn't tell the whole story, humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.

In the cooler months, when temperatures drop below 10°C, high humidity makes the cold feel more cutting than it would in dry conditions.

In LʼÎle-dʼOlonne, January is the coolest month, with average highs of 11°C (52°F) and humidity around 86%, considered very high. In August, the warmest month, temperatures average 23°C (73°F) with 77% humidity, conditions that feel high. For a full picture, see our humidity page.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained, so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.

For more on LʼÎle-dʼOlonne's weather, including monthly rainfall, sunshine hours, and humidity, visit our LʼÎle-dʼOlonne climate page.