September Weather in Roscoff, France

Last updated: February 26, 2025

In Roscoff, France, September greets visitors with a pleasant average temperature of 16°C (61°F), peaking at a comfortable 22°C (71°F) while dipping to a mild 11°C (52°F) at night. This charming coastal town experiences 51 mm (2.0 in) of rainfall spread over 9 days, ensuring the lush landscapes remain vibrant. With a humidity level hovering around 76%, the air feels crisp yet refreshing, creating an inviting atmosphere for exploring the region's rich culture and stunning scenery. Whether basking in the sun or enjoying the occasional drizzle, September in Roscoff offers a delightful blend of warmth and tranquility.

September Temperature in Roscoff

In September, Roscoff experiences a welcome transition as summer gracefully gives way to autumn. With minimum temperatures averaging around 11°C (52°F) and daytime highs reaching a comfortable 22°C (71°F), visitors can enjoy the lingering warmth while avoiding the peak season crowds. The average temperature settles at a pleasant 16°C (61°F), making it an ideal time for coastal strolls and outdoor activities. As days gradually shorten and the sea reflects the changing hues of fall, September offers a perfect blend of mild weather and vibrant scenery, inviting travelers to explore this charming French seaside town.

September Weather in Roscoff: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Roscoff, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec484849515458616261575351
Data source: Temperature data for Roscoff generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Roscoff

September in Roscoff, France, marks a subtle shift in the weather patterns as summer wanes. With 51 mm (2.0 in) of precipitation spread across 9 days, it transitions to a wetter season, yet remains drier than both the more saturated October and November. This month typically sees a rise in rainfall from the low summer totals, reflecting the approach of autumn and its unpredictable showers. As the temperature cools, the increase in persistent drizzles may foreshadow the abundant rainfall that defines the subsequent months, inviting locals and visitors alike to embrace the changing scenery with its lush, vibrant hues.

September Precipitation Trends in Roscoff

The chart displays monthly precipitation patterns in Roscoff, with values for each month alongside September's data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September's conditions compare to those of other months.
JanFebMarAprMayJunJulAugSepOctNovDec10210378446272384451133108161
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Roscoff

In Roscoff, France, September brings a slight increase in humidity, averaging 76%. This month marks a transition, as summer humidity levels begin to retreat from the comfortable 71% seen in August. The trend showcases a gradual decline from the moist conditions of winter, where humidity peaks at 90% in both November and December. While the summer months enjoy lower levels, dipping to 63% in July, September's humidity starts to bridge the gap, hinting at the upcoming wetter autumn months. This rhythm of humidity fluctuations reflects the coastal climate's charming ebb and flow, making Roscoff an intriguing destination for those who appreciate the nuances of nature's seasonal dance.

September Average Humidity in Roscoff

This chart illustrates the average monthly humidity levels in Roscoff, with September's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how September's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%85%84%81%77%63%71%76%89%90%90%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Roscoff

As summer fades in Roscoff, September sees a notable shift in the UV Index, settling at 6, which classifies it as high. This drop from the very high levels of 8 and 9 experienced in the peak summer months indicates a more manageable sun exposure. With a burn time of 25 minutes, it’s wise for sun-seekers to remain vigilant, especially during midday hours. This transitional month marks a return to more moderate UV levels, reminiscent of earlier spring months. For those planning outdoor activities, it's essential to stay informed about the UV Index to ensure safe and enjoyable sun exposure. For continuous updates and tips, check Roscoff UV Index.

Maximum UV Index Levels in Roscoff for September

The chart shows the monthly maximum UV Index (UVI) for Roscoff in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec235689986421
Data source: Roscoff September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

September Sunshine in Roscoff

In September, Roscoff, France, basks in a delightful 336 hours of sunshine, signaling the tail end of a vibrant summer. The sunlight peaks in the summer months, with July boasting the most hours at 430, while August starts to taper off slightly. As the seasons shift, September still retains a generous amount of sunshine, promoting those lingering late-summer activities amidst the beginning of autumn. While the days shorten in the following months, with October seeing a noticeable drop to 271 hours, September stands out as a transition period, offering a perfect blend of warmth and light before the chill sets in. The gradual decrease in sunshine hours reflects a beautiful cyclical rhythm in nature, enhancing the charm of Roscoff during this picturesque time.

Monthly Sunshine Duration in Roscoff: September Highlighted

The September sunshine duration represents the total number of hours Roscoff experiences direct sunlight during the month of September, excluding cloudy or obstructed periods. This chart compares the sunshine duration of September with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec135h206h292h359h414h411h430h393h336h271h221h181h
Data source: Roscoff September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Roscoff During September

In Roscoff, France, September welcomes the transitional shift toward autumn with an encouraging 40% chance of sunny weather. This figure notably mirrors the sunlit prospects of June and August, both of which also enjoy a 40% likelihood of clear skies. The increasing trend from the mid-year months is encouraging, as the region experiences its peak sun chances around April, dropping slightly to a consistent mid-level as summer wanes. While the September sun might not be as assured as in the peak months of July, there's still ample opportunity to soak up the last rays of warmth before winter settles in, making it a delightful month for outdoor activities in this charming coastal town.

Percentage of Sunny Days in September in Roscoff

The chart illustrates the percentage of sunny days in Roscoff throughout the year, with September highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Roscoff experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec20%26%36%50%40%34%45%40%40%38%28%25%
Data source: Roscoff September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Roscoff in September

As September rolls into Roscoff, France, daylight hours begin to gently wane, offering a transitional glimpse of autumn. With approximately 12 hours of daylight, September marks a significant shift from the vibrant, sun-soaked days of summer, where June enjoyed the longest stretch at 16 hours. The month gracefully bridges the gap between the lush brightness of summer and the cooler twilight of fall, following a steady decline from 15 hours in July and 14 hours in August. This pattern underscores a consistent seasonal trend, as daylight durations gradually shorten from the year’s peak in June, shaping the rhythm of life in this charming coastal town. Embracing this change, locals celebrate the softer light and crisp air, heralding the arrival of a new season.

Average Daylight Hours in Roscoff for September

The chart illustrates the variation in daylight duration in Roscoff throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 47m10h 11m11h 55m13h 43m15h 15m16h 3m15h 37m14h 15m12h 31m10h 45m9h 10m8h 20m
Data source: Roscoff daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Roscoff

As summer transitions to autumn, September in Roscoff, France, experiences a gentle decline in wind speed, averaging 5.4 m/s (about 12 mph). This marks a notable decrease from the breezier summer months of June and July, where winds blew at 4.3 m/s and 5.8 m/s respectively. Interestingly, September's winds are softer than the earlier part of the year, contrasting the more vigorous gusts of January and February, which reached averages of 7.9 m/s and 8.8 m/s. This shift hints at a calming maritime atmosphere as the region prepares for the cooler months ahead, inviting residents and visitors to leisurely enjoy the picturesque coastal scenery without the typical summer gales.

Average September Wind Speed in Roscoff

The chart displays monthly wind speed patterns in Roscoff, with values for each month shown alongside September's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how September's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec7.98.87.37.17.74.35.85.95.4 m/s6.97.09.2
Data source: Roscoff September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Roscoff Compares to Other Months

The weather in Roscoff 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 Roscoff and find detailed weather information for every month.

In September, the weather in Roscoff is generally mild, with average temperatures ranging from a minimum of 11°C (52°F) to a maximum of 22°C (71°F). The month experiences around 51 mm (2.0 in) of precipitation over approximately 9 days, accompanied by a humidity level of 76%. In contrast, January sees much cooler temperatures, with averages dropping to a minimum of 2°C (36°F) and a maximum of 14°C (58°F). The precipitation increases significantly to 102 mm (4.0 in) over about 16 days, along with a higher humidity level of 89%. This stark difference highlights the transition from the mild early autumn to the chillier depths of winter. For more details on January's weather in Roscoff, visit Roscoff weather in January.

September and February present contrasting weather patterns. In September, temperatures are milder, with an average of 16°C (61°F), while February experiences a cooler average of just 9°C (49°F). Precipitation is also significantly higher in February, with 103 mm (4.0 in) falling over 17 days, compared to September's 51 mm (2.0 in) spread over 9 days. Humidity levels are notably elevated in February at 88%, compared to 76% in September, contributing to a more damp and chilly atmosphere during the winter month. For a more detailed look at February weather conditions, you can visit Roscoff weather in February.

September and March present distinctly different weather patterns. In September, temperatures typically range from a minimum of 11°C (52°F) to a maximum of 22°C (71°F), with an average of 16°C (61°F), making it a relatively mild month. It experiences about 51 mm (2.0 in) of precipitation over approximately 9 days and maintains a humidity level of 76%. In contrast, March features a cooler climate, with temperatures ranging from a minimum of -1°C (31°F) to a maximum of 17°C (63°F) and an average of 9°C (49°F). This month sees higher precipitation, totaling 78 mm (3.1 in) across 16 days, coupled with increased humidity at 85%. For more detailed insights, you can refer to Roscoff weather in March.

When comparing the weather in September and April, a few notable differences emerge. September tends to be warmer, with average temperatures ranging from a minimum of 11°C (52°F) to a maximum of 22°C (71°F), while April's temperatures are cooler, averaging between 5°C (41°F) and 18°C (65°F). Precipitation levels are somewhat similar, with September experiencing 51 mm (2.0 in) over 9 days and April receiving 44 mm (1.7 in) across 8 days. Humidity is slightly higher in April at 84%, compared to September's 76%. For more detailed information about the weather in April, you can check out Roscoff weather in April.

When comparing the weather in September and May, September boasts slightly warmer temperatures, with averages ranging from a minimum of 11°C (52°F) to a maximum of 22°C (71°F), while May's temperatures are cooler, averaging between 8°C (47°F) and 19°C (67°F). Although May sees more humidity at 81% compared to September's 76%, both months experience notable precipitation—September averages 51 mm (2.0 in) over 9 days, compared to May's 62 mm (2.5 in) over 10 days. For a closer look at May's weather in Roscoff, you can refer to Roscoff weather in May.

When comparing the weather in September and June, we see some interesting similarities and differences. Both months experience minimum temperatures of 11°C (52°F) and maximums around 22°C (72°F). However, September tends to be slightly warmer on average at 16°C (61°F), compared to June's average of 14°C (58°F). Precipitation levels are higher in June, with 72 mm (2.8 in) falling over 11 days, while September sees 51 mm (2.0 in) over 9 days. Both months have similar humidity levels, with September at 76% and June at 77%. For more detailed insights specifically about June, you can check Roscoff weather in June.

In comparing the weather of September and July, we can see some notable differences. September tends to be slightly cooler, with minimum temperatures reaching 11°C (52°F) compared to July's minimum of 14°C (57°F). Both months share an average temperature of 16°C (61°F), but July has a maximum temperature of 21°C (70°F), while September peaks at 22°C (71°F). Precipitation is more frequent in September, with 51 mm (2.0 in) over 9 days, compared to 38 mm (1.5 in) across 7 days in July. Additionally, September's humidity level is higher at 76%, compared to July's 63%. For more details on the summer conditions, you can check out Roscoff weather in July.

In September, the weather is slightly cooler than in August, with minimum temperatures dropping to 11°C (52°F) compared to August's 13°C (55°F). The average temperature remains the same at 16°C (61°F), but the maximum temperature is noticeably lower in September at 22°C (71°F) versus 25°C (78°F) in August. Precipitation increases slightly in September to 51 mm (2.0 in) over 9 days, compared to August's 44 mm (1.7 in) over 8 days, and humidity rises to 76% in September from 71% in August. For a detailed look at August weather, you can check out Roscoff weather in August.

September and October present a notable shift in weather conditions. In September, temperatures range from a minimum of 11°C (52°F) to a maximum of 22°C (71°F), with an average of 16°C (61°F) and relatively mild humidity at 76%. Precipitation is modest, totaling 51 mm (2.0 in) over 9 days. In contrast, October features cooler temperatures, with a minimum of 8°C (46°F) and an average of 14°C (58°F), while the maximum temperature slightly decreases to 21°C (69°F). Rainfall increases significantly to 133 mm (5.2 in) spread across 16 days, accompanied by higher humidity at 89%. This transition marks October as a wetter and cooler month. For more specific details on the weather patterns, you can refer to Roscoff weather in October.

In September, temperatures in Roscoff are milder, with a minimum of 11°C (52°F) and an average of 16°C (61°F), peaking at 22°C (71°F). The month sees moderate precipitation of 51 mm (2.0 in) spread over 9 days, accompanied by a humidity level of 76%. Conversely, November experiences significantly cooler temperatures, with a minimum of 6°C (44°F) and an average of 12°C (53°F), reaching a maximum of only 16°C (62°F). Additionally, November is much wetter, receiving 108 mm (4.3 in) of rain over 18 days, and the humidity rises to a notable 90%. For more detailed information, visit Roscoff weather in November.

In September, the weather tends to be milder, with average temperatures ranging from a minimum of 11°C (52°F) to a maximum of 22°C (71°F), accompanied by relatively low precipitation of 51 mm (2.0 in) over 9 days. The humidity level is also moderate at 76%. In contrast, December brings much cooler conditions, with average temperatures dipping to a minimum of 5°C (41°F) and a maximum of 14°C (57°F). Rainfall is significantly higher in December, totaling 161 mm (6.3 in) over 21 days, and the humidity rises to a damp 90%. For more details on the December weather, you can check Roscoff weather in December.

Compare Roscoff's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Roscoff

As September unfolds in Roscoff, the weather transitions subtly, showcasing a balance between the warmth of late summer and the onset of autumn. With pleasant daytime temperatures averaging around 16°C (61°F), it’s a perfect time for outdoor exploration and unwinding by the coast. Although you might encounter a few rain showers throughout the month, the overall precipitation remains moderate, with around 51 mm spread across about 9 days. This humidity level of 76% lends a refreshing feel to the air, making those gentle September breezes quite invigorating. If you’re interested in seeing how these conditions fit into the broader climate patterns, check out Roscoff Climate for a comprehensive overview.