Last updated: February 26, 2025
September in Biarritz, France offers a delightful blend of warmth and coastal charm, with maximum temperatures reaching up to 34°C (94°F) and a comfortable average of 20°C (67°F). The evenings bring a cooler breeze, with minimum temperatures dipping to 11°C (52°F), ensuring a pleasant end to the day. However, visitors should be prepared for occasional showers, as the region experiences about 88 mm (3.5 in) of precipitation over 11 days throughout the month. With a humidity level around 75%, September provides a refreshing, yet warm atmosphere, perfect for enjoying the vibrant local culture and stunning coastal scenery.
In September, Biarritz enjoys a delightful transition from summer to autumn, with temperatures that reflect this charming shift. With a minimum of 11°C (52°F) and a comfortable average of 20°C (67°F), visitors can soak in the lingering warmth of summer. The maximum temperature can reach 34°C (94°F), echoing the heat of August while gradually cooling as the month progresses. This creates the perfect ambiance for enjoying the city’s stunning beaches and vibrant culture before the drop in temperatures that October brings. Overall, September in Biarritz is a splendid time for outdoor activities, where warm days and cooler nights foster a unique blend of relaxation and adventure.
In September, Biarritz experiences a moderate precipitation level of 88 mm (3.5 in), which marks a slight increase from the drier summer months of July and August, where rainfall was at a minimal 66 mm (2.6 in) and 74 mm (2.9 in), respectively. With rain falling on 11 days, September's weather hints at the transition from the summer heat to the cooler, wetter autumn climate, making it a balanced month for visitors who wish to enjoy the lingering warmth while preparing for upcoming seasonal changes. This shift is indicative of a broader trend, as precipitation levels begin to rise again leading into October, when Biarritz typically sees over 120 mm (4.7 in) of rain, signaling the onset of fall's wetter pattern.
As the summer seasons fade into autumn, September marks a point of transition in Biarritz, France, with humidity levels dipping to a comfortable 75%. This slight decrease continues the trend observed from the peak summer months, where humidity peaked at 76% in August. Following a gradual drop throughout the month, September's humidity offers a refreshing reprieve compared to the heavier, more humid conditions of earlier in the year, such as January's staggering 86%. The overall pattern indicates a gradual decline in humidity as the year progresses, with winter months like November and December seeing a resurgence with levels climbing back to 85% and 87%, respectively. This ebb and flow not only enhances the charm of Biarritz but also makes it an inviting destination during the pleasantly mild September days.
In September, Biarritz experiences a UV Index of 7, indicating a high exposure category with a burn time of approximately 25 minutes. As summer gives way to autumn, there is a notable decline from the peak index of 10 in June and July. This transition highlights a shift in sun intensity, with visitors still enjoying considerable sunshine while needing to stay vigilant against UV exposure. The month sees a return to safer levels, yet caution is still warranted, especially for those with sensitive skin. For more insights on UV safety, check out Biarritz UV Index.
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As summer wanes, September in Biarritz, France, offers a delightful balance of sunshine with 338 hours of radiant light. This month marks a transition from the peak of summer, where July basked in 410 hours of sun, and August held onto a close 388 hours. Yet, September’s glow remains generous, notably more than the cooler months that follow, such as October's 295 hours and November’s mere 232 hours. This trend highlights September as a perfect time to savor the lingering warmth of summer before the cool embrace of autumn takes hold, making it an ideal month for both relaxation and exploration along the stunning Basque coast.
In Biarritz, France, September offers a moderate 32% chance of sunny weather, striking a balanced finale to the summer season. As the months progress from January's chilly 23% to August's peak 42%, September sees a slight dip, signaling the transition into autumn. This month's sun probability mirrors the averages found in May and June, highlighting a trend of fluctuating sun exposure during the shoulder seasons. While not as bright as the height of summer, September still promises enjoyable days, making it an appealing time for visitors seeking a blend of pleasant weather and fewer crowds.
As summer gently fades in Biarritz, September brings a delightful blend of warmth and decreasing daylight, offering about 12 hours of sunlight each day. This marks a subtle transition from the sun-drenched days of July and August, which enjoy a peak of 15 hours. Following this, the days gradually shorten into autumn, reflecting a consistent pattern throughout the year—from a mere 9 hours of daylight in January to a brisk 8 hours in December. September serves as a graceful bridge, allowing residents and visitors alike to savor the lingering light while preparing for the cozy embrace of autumn. The subtle decline in daylight emphasizes the region's charming seasonal rhythm, inviting all to revel in the beauty of changing times.
As the summer fades in Biarritz, the September wind brings a gentle calm with an average speed of 2.7 m/s (6 mph), marking one of the year's quietest months. This continues the trend of decreasing wind speeds from the vibrant gusts of July and August, where the breezes reached up to 3.1 m/s (7 mph) and 2.8 m/s (6 mph) respectively. The transition into autumn heralds a slower pace, reflecting the serene atmosphere of the region. Following September, a slight uptick occurs in October, suggesting a revival of the winds as they resume to around 3.1 m/s (7 mph). Overall, these variations create a rhythmic cycle, with Biarritz’s winds painting a picture of tranquility in early fall.
The weather in Biarritz 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 Biarritz and find detailed weather information for every month.
September and January present striking contrasts in weather patterns. In September, temperatures range from a mild 11°C (52°F) at night to a warm 34°C (94°F) during the day, with an average of 20°C (67°F). The month experiences moderate rainfall of 88 mm (3.5 in) over about 11 days and a humidity level of 75%. In contrast, January is much cooler, with temperatures dipping to a minimum of -1°C (30°F) and peaking at 20°C (69°F), averaging around 8°C (47°F). This winter month receives more precipitation at 131 mm (5.2 in), spread over 13 days, and has higher humidity at 86%. For more detailed insights on January weather, you can visit Biarritz weather in January.
In September, temperatures range from a mild 11°C (52°F) at night to a warm 34°C (94°F) during the day, averaging around 20°C (67°F). The month experiences moderate precipitation, with about 88 mm (3.5 in) falling over 11 days, and humidity sits at a comfortable 75%. In contrast, February brings much cooler weather, with minimum temperatures dropping to -3°C (27°F) and a maximum of 24°C (75°F). The average temperature is around 11°C (52°F), while precipitation increases slightly to 111 mm (4.4 in) over 12 days, accompanied by a higher humidity of 85%. For more details about the weather in February, check out Biarritz weather in February.
In September, the weather is typically warm, with average temperatures around 20°C (67°F) and maximum highs reaching up to 34°C (94°F). This month experiences considerable humidity at 75%, along with moderate rainfall of about 88 mm (3.5 in) spread over 11 days.
In contrast, March sees significantly cooler temperatures, with an average of 12°C (53°F) and maximums peaking at 26°C (79°F). The amount of precipitation increases to 107 mm (4.2 in), affecting 15 days, alongside a higher humidity level of 82%. For more detailed weather information, check out Biarritz weather in March.
Overall, September leans towards warm and humid conditions, while March tends to be cooler and wetter.
When comparing the weather in September and April, notable differences emerge. September boasts warmer temperatures, with a minimum of 11°C (52°F) and a maximum reaching up to 34°C (94°F), making it the warmer month overall, with an average temperature of 20°C (67°F). In contrast, April features cooler weather, starting at a minimum of 2°C (36°F) and peaking at 28°C (83°F), averaging just 13°C (56°F). Both months experience similar levels of precipitation—around 88-89 mm (3.5 in)—but September has rain on about 11 days, while April sees it on 12 days. Additionally, April tends to be slightly more humid at 81%, compared to September’s 75%. For more detailed insights, you can check out Biarritz weather in April.
In comparing the weather between September and May, September typically enjoys warmer temperatures, with an average of 20°C (67°F) and a maximum reaching up to 34°C (94°F), while May's averages are cooler, at around 16°C (61°F) with a maximum of 31°C (88°F). Both months experience notable humidity, with September at 75% and May slightly higher at 80%. Precipitation is also a significant factor, as May sees more rainfall at 125 mm (4.9 in) over 15 days, compared to September's 88 mm (3.5 in) spread over 11 days. For those interested in specific weather conditions, more detailed information can be found Biarritz weather in May.
In comparing the weather between September and June, we find that both months experience similar minimum temperatures, hovering around 11°C (52°F). However, September offers a slightly warmer average temperature of 20°C (67°F) compared to June's 19°C (66°F). Notably, June has a slightly higher maximum temperature of 35°C (95°F) versus September's peak of 34°C (94°F). Additionally, June sees more precipitation, with 106 mm (4.2 in) over 13 days, compared to September's 88 mm (3.5 in) across 11 days. Humidity levels are also slightly higher in June, at 81%, compared to September’s 75%. For further details, you can check out the Biarritz weather in June.
In comparing September and July weather, September tends to be slightly cooler overall, with average temperatures ranging from a minimum of 11°C (52°F) to a maximum of 34°C (94°F), while July sees higher temperatures, with a minimum of 14°C (57°F) and a peak of 37°C (99°F). Despite July's higher temperatures, it has less precipitation, recording 74 mm (2.9 in) over 11 days compared to September's 88 mm (3.5 in) during the same number of days. Humidity levels are also slightly lower in July at 80%, in contrast to September’s 75%. For more insights on temperatures, check out Biarritz weather in July.
In comparing the weather of September and August, we see that September tends to experience slightly lower minimum temperatures, with a minimum of 11°C (52°F) compared to August's 14°C (57°F). The average temperatures remain relatively consistent, hovering around 20°C (67°F) in September and 21°C (70°F) in August. Both months share the same maximum temperature of 34°C (94°F), offering warm conditions. However, September sees increased precipitation, with 88 mm (3.5 in) over 11 days, while August has only 66 mm (2.6 in) across the same number of days. Humidity levels are similar, at 75% in September and 76% in August. For further details on August weather, you can refer to Biarritz weather in August.
September and October display notable differences in weather patterns. September features warmer temperatures, with a minimum of 11°C and an average of 20°C, peaking at a maximum of 34°C. In contrast, October sees cooler conditions, with temperatures dropping to a minimum of 7°C and an average of 16°C, maxing out at 28°C. Rainfall increases in October, reaching 120 mm over 13 days, compared to September’s 88 mm over 11 days. Additionally, humidity levels rise slightly, with October at 81% compared to September’s 75%. For a detailed look at the weather during this month, check Biarritz weather in October.
In September, the weather typically showcases warmer temperatures, with minimums around 11°C (52°F) and maximums peaking at 34°C (94°F). The average temperature is a comfortable 20°C (67°F), but it also experiences a fair amount of rainfall, with 88 mm (3.5 in) collected over 11 days and humidity levels at 75%. In contrast, November sees a significant drop in temperatures, with minimums dropping to 4°C (39°F) and an average of just 12°C (54°F). Although the maximum temperature remains pleasant at 24°C (75°F), the month is much wetter, receiving about 192 mm (7.6 in) of precipitation over 16 days and an increase in humidity to 85%. For more detailed information, check Biarritz weather in November.
September and December present strikingly different weather patterns. In September, temperatures range between a mild 11°C (52°F) and a warm 34°C (94°F), with an average of around 20°C (67°F) and relatively lower precipitation of 88 mm (3.5 in) over 11 days. The humidity sits at a comfortable 75%. Conversely, December ushers in cooler days with min temperatures dropping to 1°C (35°F) and max temperatures capping at 19°C (67°F). The average temperature hovers around 11°C (51°F), and it experiences significantly more rainfall, totaling 221 mm (8.7 in) across 16 days, along with a higher humidity level at 87%. For more information, check this link: Biarritz weather in December.
As summer fades, September in Biarritz ushers in a delightful transition with pleasantly mild temperatures and a refreshing ocean breeze. While the month can still experience the warmth of summer, with maximum highs occasionally reaching into the low 30s°C, it generally offers a more comfortable average that beckons outdoor activities. Rainfall becomes more frequent, with several wet days contributing to a lush, vibrant landscape, yet it remains manageable amidst the post-summer charm. The increased humidity adds a touch of softness to the air, making it an ideal time for those looking to escape the heat of other regions. For a detailed overview of what to expect throughout the year, visit Biarritz Climate.