Last updated: February 26, 2025
In September, Arcachon, France, showcases a delightful transition from summer to autumn, with maximum temperatures reaching 29°C (85°F), while the average settles around a comfortable 19°C (67°F). Visitors can expect cooler nights, dipping to a minimum of 11°C (53°F). Although the month brings some rain, with 58 mm (2.3 in) of precipitation over 9 days, the air remains pleasantly humid at 76%, enhancing the region's vibrant coastal charm. This makes September an ideal time for outdoor activities amidst the stunning landscapes of Arcachon.
In September, Arcachon begins to show a gentle transition toward autumn, with temperatures ranging from a minimum of 11°C (53°F) to a maximum of 29°C (85°F). The average temperature settles around 19°C (67°F), providing a comfortable climate that still embraces the warmth of late summer while hinting at the cooler days to come. This month strikes a harmonious balance, inviting visitors to enjoy outdoor activities against a backdrop of vibrant fall foliage. As the heat of August fades, September offers an ideal blend of sunny days and pleasantly mild evenings, making it a perfect time to explore the picturesque coastline and charming streets of this beautiful French destination.
In September, Arcachon experiences a moderate increase in rainfall, with 58 mm (2.3 in) of precipitation spread over approximately 9 days. This marks a shift from the drier summer months of July and August, which both recorded just 44 mm (1.7 in) of rain. As autumn approaches, the region transitions into a wetter season, evident in the rising monthly totals, with October expected to bring 86 mm (3.4 in). September’s rainfall may signal the end of summer’s dryness, as the landscape rejuvenates in anticipation of the lush, vibrant months to come. The gradual increase in both precipitation amount and days of rain reflects Arcachon's shift from the warmth of summer to the cooler, wetter fall season.
In September, Arcachon experiences a modest rise in humidity, reaching 76%, which is slightly higher than the summer highs of 73% in August. This transition marks the beginning of autumn, where humidity levels gradually escalate as the year progresses, moving towards the more humid months of late fall and winter. Interestingly, while summer enjoys its lowest humidity levels, September offers a blend of warmth and moisture, keeping the coastal air refreshing. As the months turn towards winter, humidity will continue to climb, culminating at a peak of 85% in January, underscoring the region’s shift from summer’s drier climes to the wetter, more humid season ahead.
As September rolls into Arcachon, the UV Index reflects a transition from the intense summer sun but remains in the high exposure category with a UV Index of 7. This means that while the risk of harm from unprotected sun exposure is reduced compared to earlier months, it still requires attention, with a burn time of 25 minutes for fair-skinned individuals. Following the peak summer values, this slight decrease indicates a shift toward milder conditions as autumn approaches. However, caution is still advisable, as the UV levels can fluctuate, reminding us that sun safety remains essential throughout the year. For more detailed information, check out the Arcachon UV Index.
UV Risk Categories
As summer transitions to autumn, September in Arcachon continues to bask in the warmth of the sun, offering a delightful 346 hours of sunshine. While slightly less than the peak of summer, this month's sunshine still reflects a significant amount, showcasing a lush continuation of bright days. The gradual decline from July's high of 429 hours signals a shift, yet September marks a seamless blend of late-season vibrancy and the charming onset of fall. Following a trend of increasing sunlight from January's 177 hours to June's impressive 416 hours, the sun's enduring presence in September invites visitors to relish in the lingering warmth before the cooler autumn days descend. With a captivating atmosphere, September in Arcachon is a picturesque time for outdoor adventures, leisurely beach strolls, and savoring the beauty of nature kissed by sunlight.
In Arcachon, France, September offers a moderate 44% chance of sunny weather, marking a transition from the summer's peak warmth. While August boasts the highest probability of sunshine at 58%, there's a noticeable dip as autumn approaches. Interestingly, September's likelihood of sun is still robust compared to earlier months, such as January and February, which see chances as low as 24% and 28%, respectively. This trend underscores a gradual increase in sunshine from late winter into early autumn, making September an appealing time for those seeking milder temperatures and a good chance of enjoying the outdoors. As October approaches, the likelihood stabilizes to 50%, hinting at the region's characteristic variability as it shifts towards fall.
As summer gives way to autumn in Arcachon, France, September marks a subtle shift in daylight duration, offering approximately 12 hours of sunlight. This month serves as a graceful transition from the long, sun-drenched days of June and July, both boasting 15 hours of daylight, to the shorter, cooler days of fall. Although September's hours are slightly reduced when compared to the vibrant 13 hours of August, the lingering warmth and longer twilight still invite locals and visitors alike to savor the beauty of early autumn. As daylight gradually diminishes into October, with only 10 hours remaining, September provides a perfect opportunity to relish the last vestiges of summer's embrace.
As summer gives way to autumn, September in Arcachon, France showcases a gentle breeze with an average wind speed of 3.3 m/s (7 mph), marking the lowest point for the year. This subtle transition from the stronger gusts of earlier months invites a more tranquil seaside experience. While the winds pick up slightly in the following months, peaking in December at 5.2 m/s (12 mph), September’s calmer conditions encourage leisurely strolls along the beach, perfect for soaking in the last warmth of the season. The overall trend reveals a gradual decline in wind speed from summer into autumn, creating a soft, serene atmosphere as the landscape prepares for the colder months ahead.
The weather in Arcachon changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of September's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Arcachon and find detailed weather information for every month.
September and January present contrasting weather patterns. In September, temperatures range from a mild 11°C (53°F) at night to a warm 29°C (85°F) during the day, with an average temperature of 19°C (67°F). The month experiences 58 mm (2.3 in) of precipitation over about 9 days and maintains a relatively high humidity of 76%. In stark contrast, January brings cooler temperatures, with a minimum of -1°C (31°F), an average of 8°C (47°F), and a maximum of 16°C (61°F). This winter month sees slightly higher precipitation at 73 mm (2.9 in) over 11 days, along with an increased humidity level of 85%. For a more detailed look at January weather, visit Arcachon weather in January.
In comparing the weather between September and February, notable differences emerge. September enjoys milder temperatures, ranging from a minimum of 11°C (53°F) to a pleasant maximum of 29°C (85°F), with an average of 19°C (67°F). In contrast, February presents a much cooler climate, with temperatures dipping as low as -3°C (27°F) and peaking at 18°C (65°F), averaging only 10°C (50°F). Precipitation levels are relatively similar, with September receiving 58 mm (2.3 in) over 9 days and February experiencing slightly more at 69 mm (2.7 in) over 11 days. Additionally, humidity is higher in February at 83%, compared to 76% in September. For more specifics on February's climate, you can explore Arcachon weather in February.
In comparing the weather of September and March, it's clear that these two months offer quite different climates. September typically enjoys warmer temperatures, with a minimum of 11°C (53°F), an average of 19°C (67°F), and a maximum of 29°C (85°F), making it more suitable for outdoor activities. In contrast, March starts off cooler, featuring a minimum temperature of -2°C (29°F) and an average of 11°C (52°F), although it can still reach up to 24°C (75°F) during warmer days.
Precipitation is also a notable difference; September experiences about 58 mm (2.3 in) of rain over 9 days, while March sees slightly more rain with 71 mm (2.8 in) over 13 days. Furthermore, March has higher humidity at 82% compared to September's 76%. For a more detailed look at March weather in Arcachon, you can visit this link: Arcachon weather in March.
When comparing the weather in September and April, notable differences emerge. September typically enjoys warmer temperatures, with an average high of 29°C (85°F), while April is cooler, averaging a maximum of 25°C (77°F). The minimum temperatures also reflect this shift, with September starting at 11°C (53°F) compared to April's cooler minimum of 3°C (38°F). Both months experience similar precipitation levels, with September receiving 58 mm (2.3 in) over 9 days and April seeing slightly less at 52 mm (2.0 in) over 8 days. Humidity is relatively high in both months, at 76% in September and 82% in April. For a more detailed look at April weather, you can view Arcachon weather in April.
When comparing the weather in September and May, several notable differences emerge. September tends to be warmer, with average temperatures ranging from 11°C (53°F) to a maximum of 29°C (85°F), while May is cooler, with temperatures between 7°C (45°F) and 27°C (81°F). Additionally, September experiences less precipitation, averaging 58 mm (2.3 in) over about 9 days, compared to May's higher rainfall of 101 mm (4.0 in) across 13 days. Humidity levels also shift slightly, with September at 76% and May slightly higher at 82%. For a more detailed look at May's climate, you can check out Arcachon weather in May.
In comparing the weather between September and June, both months exhibit similar average temperatures, with September offering a minimum of 11°C (53°F) and a maximum of 29°C (85°F), while June has slightly higher min and max temperatures at 12°C (54°F) and 33°C (92°F) respectively. September tends to be drier, receiving only 58 mm (2.3 in) of precipitation over 9 days, compared to June's 96 mm (3.8 in) spread over 12 days. Humidity levels are also comparable, with September registering at 76% and June slightly higher at 80%. For a more detailed look at June's weather specifics, you can find additional information here: Arcachon weather in June.
In comparing the weather of September and July, September tends to be slightly cooler, with average temperatures ranging from a minimum of 11°C (53°F) to a maximum of 29°C (85°F), contrasting with July's warmer range of 15°C (60°F) to 33°C (92°F). Although both months experience similar humidity levels at 76%, July has less precipitation, averaging 44 mm (1.7 in) over 8 days, compared to September’s 58 mm (2.3 in) over 9 days. This makes July generally drier and hotter, while September offers a more temperate climate. For more detailed information, you can check the Arcachon weather in July.
In comparing the weather conditions of September and August, September experiences slightly cooler temperatures, with a minimum of 11°C (53°F) and an average of 19°C (67°F), compared to August's milder temperatures that range from a minimum of 15°C (59°F) and an average of 21°C (71°F). The maximum temperature in September reaches 29°C (85°F), while August peaks at a higher 31°C (87°F). Additionally, September tends to be wetter, receiving 58 mm (2.3 in) of precipitation over 9 days, compared to August's 44 mm (1.7 in) over just 7 days. Humidity is slightly higher in September at 76%, compared to 73% in August. For a closer look at August weather in this region, you can visit Arcachon weather in August.
September and October showcase a notable transition in weather patterns. In September, temperatures range from a minimum of 11°C (53°F) to a maximum of 29°C (85°F), with an average of 19°C (67°F). The month experiences moderate rainfall, totaling 58 mm (2.3 in) over approximately 9 days, alongside a humidity level of 76%. In contrast, October sees cooler temperatures, with a minimum of 6°C (44°F) and an average of 16°C (61°F), peaking at 24°C (76°F). Rainfall increases to 86 mm (3.4 in) over 11 days, and humidity rises slightly to 81%. For more detailed insights, check out Arcachon weather in October.
September and November showcase a notable transition in weather characteristics. In September, temperatures range from a minimum of 11°C (53°F) to a maximum of 29°C (85°F), with an average of 19°C (67°F), making it relatively warm. The month experiences less precipitation, with only 58 mm (2.3 in) over about 9 days. Humidity levels are moderately high at 76%. In contrast, November brings a significant drop in temperature, with a minimum of 4°C (39°F) and an average of 12°C (54°F), peaking at 20°C (68°F). Precipitation increases notably to 108 mm (4.2 in) across approximately 13 days, accompanied by higher humidity at 83%. For a detailed look at weather conditions, check Arcachon weather in November.
September and December present distinctly different weather patterns. In September, temperatures are generally milder, with a minimum of 11°C (53°F) and an average high reaching 29°C (85°F). The month sees relatively low precipitation at 58 mm (2.3 in) over about 9 days, accompanied by a comfortable humidity of 76%. In contrast, December experiences much cooler temperatures, with a minimum of just 3°C (37°F) and an average high of 16°C (61°F). Precipitation increases significantly during this month, totaling 151 mm (5.9 in) and occurring on around 18 days, while humidity rises to 85%. For more specific information about the weather in December, you can check Arcachon weather in December.
As summer transitions into autumn, September in Arcachon showcases a delightful variety of weather experiences. With temperatures averaging around 19°C, the days remain pleasantly warm, yet cooler evenings invite a cozy ambiance. While the humidity hovers at 76%, it’s the occasional rainfall that punctuates the month, offering refreshing breaks amidst the cheerful sunshine. Compared to the sweltering peak of summer, September provides the perfect opportunity for visitors to enjoy outdoor activities without the intensity of heat. For those looking to explore the best this season has to offer, check out more details on Arcachon Climate.