September Weather in Saint-Denis, France

Last updated: February 26, 2025

September in Saint-Denis, France captivates with its dynamic weather. As temperatures range from a chilly 4°C (40°F) at night to a sweltering 33°C (91°F) during the day, visitors can experience a vibrant mix of warm days and cooler evenings. The month averages a pleasant 16°C (62°F), making it an ideal time for outdoor activities. However, be prepared for the occasional shower, as 9 days in September bring about 40 mm (1.6 in) of rainfall. With humidity levels at a comfortable 76%, the air is crisp yet refreshing, inviting all to explore the beauty of the season in this charming locale.

September Temperature in Saint-Denis

As September unfolds in Saint-Denis, France, the city transitions into a milder climate, reflecting the gentle shift from summer to autumn. Temperatures begin to cool with a minimum of 4°C (40°F), gradually climbing to an average of 16°C (62°F) during the day, peaking at a comfortable 33°C (91°F). This month showcases a pleasant decline from the sweltering heights of summer, offering a more temperate escape for locals and visitors alike. With mild evenings and warm afternoons, September presents an ideal time to explore the vibrant streets and parks, as the air carries hints of the coming fall while still embracing the warmth of lingering summer days.

September Weather in Saint-Denis: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Saint-Denis, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec404346525765686762554643
Data source: Temperature data for Saint-Denis 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 Saint-Denis

In September, Saint-Denis experiences a relatively mild dip in precipitation, totaling 40 mm (1.6 in) over 9 days. This marks a transition into autumn, where rainfall is noticeably less than the summer months, yet still consistent enough to keep the surroundings lush. Despite the lighter showers compared to the heavier October rainfall of 78 mm (3.1 in), which follows closely, September offers a refreshing respite from the summer heat. As the city gears up for the cooler season, the gradual decrease in precipitation serves as a gentle reminder of nature's shifting rhythm, making it an ideal time for locals and visitors alike to enjoy the early autumn atmosphere.

September Precipitation Trends in Saint-Denis

The chart displays monthly precipitation patterns in Saint-Denis, 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.
JanFebMarAprMayJunJulAugSepOctNovDec5669753470744959407866102
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Saint-Denis

In September, humidity in Saint-Denis, France experiences a noticeable increase, settling at 76%. This marks a shift from the summer months, where humidity levels dipped to a comfortable 68% in August. As the warm weather gives way to the crispness of autumn, the rise in humidity hints at the impending seasonal changes. Interestingly, September's humidity starts the gradual ascent towards the much higher levels typical of the fall and winter months, where it peaks at 93% in December. This trend highlights the dynamic interplay of seasonal transitions in Saint-Denis, offering a taste of the moisture-laden air that the later months will bring.

September Average Humidity in Saint-Denis

This chart illustrates the average monthly humidity levels in Saint-Denis, 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.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%85%84%82%80%73%68%76%88%92%93%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Saint-Denis

As summer fades into autumn in Saint-Denis, France, the UV Index begins to decline, but caution is still warranted. In September, it registers a high level of 6, which means sunbathers should be aware of their exposure, with a burn time of approximately 25 minutes. This marks a shift from the intense very high levels seen during the peak summer months of June through August, which recorded indices of 8 and 9. While September’s UV levels remain significant, they gradually approach the moderate range seen in early spring and late fall. As the seasons change, it’s essential to stay informed about local UV conditions for safe outdoor activities. For more details about the UV Index throughout the year, visit Saint-Denis UV Index.

Maximum UV Index Levels in Saint-Denis for September

The chart shows the monthly maximum UV Index (UVI) for Saint-Denis 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.
JanFebMarAprMayJunJulAugSepOctNovDec234689886421
Data source: Saint-Denis 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 Saint-Denis

In September, Saint-Denis, France, basks in 323 hours of sunshine, a delightful continuation of the summer warmth that peaks in the preceding months. Following the sun-drenched heights of July and June, which boast over 400 hours each, September still holds its charm with a significant amount of sunlight, despite the gradual transition into fall. As the days shorten and the vibrant displays of autumn begin to emerge, this month serves as a gentle reminder of summer's lingering touch, contrasting sharply with the light scarcity of the upcoming October and November months, which see a notable drop in sunshine hours. Thus, September not only ensures a smooth transition from summer to autumn but also offers a radiance that invites residents and visitors alike to savor the last whispers of summer.

Monthly Sunshine Duration in Saint-Denis: September Highlighted

The September sunshine duration represents the total number of hours Saint-Denis 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.
JanFebMarAprMayJunJulAugSepOctNovDec124h202h270h356h389h409h411h385h323h266h201h159h
Data source: Saint-Denis September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Saint-Denis During September

As September rolls into Saint-Denis, the chance of sunny weather stands at around 40%, marking a delightful transition from the summer months. This period shows a slight uptick compared to the more humid days of July and August, which linger in the 36% range. Notably, September's sunshine probability is an improvement from the earlier months of the year like January and February, where the chances hover below 30%. The month's weather signifies a promising shift towards clearer skies, especially when paired with the 41% probability observed in October, hinting at a lingering warmth as autumn approaches. This trend indicates that while September is not the sunniest month, it offers a pleasant opportunity for those seeking to enjoy the outdoors before the chill of autumn sets in.

Percentage of Sunny Days in September in Saint-Denis

The chart illustrates the percentage of sunny days in Saint-Denis 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 Saint-Denis experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec15%27%45%58%35%36%36%36%40%41%25%25%
Data source: Saint-Denis September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Saint-Denis in September

As the summer sun sets in Saint-Denis, France, September marks a gentle transition towards autumn, offering residents and visitors about 12 hours of daylight. This decrease from the sun-drenched peak of 16 hours in June reflects a rhythmic ebb in daylight that begins in late summer. The month stands out as the last glimpse of longer days before the daylight dwindles further into October and November, where it plummets to 10 and 9 hours, respectively. This gradual shift invites the vibrant colors of early fall, allowing residents to savor the rich beauty of the season while enjoying an ample, though shorter, day.

Average Daylight Hours in Saint-Denis for September

The chart illustrates the variation in daylight duration in Saint-Denis throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 44m10h 9m11h 55m13h 44m15h 18m16h 6m15h 41m14h 17m12h 32m10h 44m9h 7m8h 17m
Data source: Saint-Denis daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Saint-Denis

As September arrives in Saint-Denis, France, the whisper of the autumn breeze is felt, bringing a gentle decline in average wind speeds to 2.7 m/s (6 mph)—the calmest of the year. This marks a notable shift from the brisker winds of spring and summer, where average speeds hovered between 3.2 m/s and 4.1 m/s (7 to 9 mph). With October on the horizon, winds are expected to pick up again, returning to more moderate levels around 3.6 m/s (8 mph). This trend reflects a seasonal transition, with September serving as a tranquil bridge between the lively gusts of earlier months and the invigorating breezes that will follow in the fall.

Average September Wind Speed in Saint-Denis

The chart displays monthly wind speed patterns in Saint-Denis, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.94.13.83.44.12.63.23.22.7 m/s3.63.13.8
Data source: Saint-Denis September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Saint-Denis Compares to Other Months

The weather in Saint-Denis 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 Saint-Denis and find detailed weather information for every month.

September and January present starkly contrasting weather conditions. In September, temperatures range from a mild 4°C (40°F) to a warm 33°C (91°F), with an average of 16°C (62°F), indicating the tail end of summer. Contrarily, January experiences much colder temperatures, with a minimum of -7°C (19°F) and a maximum of only 14°C (58°F), averaging around 5°C (40°F). While September sees less precipitation at 40 mm (1.6 in) over 9 days, January is wetter, with 56 mm (2.2 in) falling over 10 days. Additionally, humidity levels are higher in January at 91% compared to September's 76%. For more detailed insights, check out Saint-Denis weather in January.

September weather is characterized by warmer temperatures, with daytime highs reaching up to 33°C (91°F) and an average of 16°C (62°F). In contrast, February presents a much cooler climate, with maximum temperatures only reaching 19°C (67°F) and an average of 6°C (43°F). Precipitation is also more frequent in February, with 69 mm (2.7 in) of rain over 13 days compared to September's 40 mm (1.6 in) over 9 days. Additionally, February tends to be more humid, with a humidity level of 89%, compared to 76% in September. For more detailed information on February weather, you can check Saint-Denis weather in February.

Comparing the weather in September and March reveals distinct seasonal differences. September experiences a milder temperature range, with minimums around 4°C (40°F) and maximums reaching up to 33°C (91°F), accompanied by lower precipitation levels of 40 mm (1.6 in) over approximately 9 days. In contrast, March sees much colder minimum temperatures dropping to -8°C (17°F) and an average of 8°C (47°F), with maximums peaking at 24°C (75°F). The month is also wetter, with 75 mm (3.0 in) of rainfall spread over about 15 days, and higher humidity levels at 85%. For more detailed insights, you can check Saint-Denis weather in March.

When comparing the weather in September and April, we observe distinct seasonal differences. September experiences warmer temperatures, with a minimum of 4°C (40°F) and a maximum reaching 33°C (91°F), while April sees lower temperatures, ranging from -3°C (27°F) to a maximum of 27°C (81°F). Additionally, September tends to be slightly wetter with 40 mm (1.6 in) of precipitation over 9 days, compared to April's 34 mm (1.3 in) over 7 days. Humidity levels are also notable, with September averaging 76% and April slightly higher at 84%. For more detailed information on April weather, you can visit Saint-Denis weather in April.

When comparing the weather in September and May, notable differences emerge in temperature and precipitation patterns. September boasts a wider temperature range, with minimums of 4°C (40°F) and maximums soaring to 33°C (91°F), averaging around 16°C (62°F). In contrast, May experiences cooler temperatures, with lows of 0°C (33°F) and highs reaching 29°C (85°F), averaging 14°C (58°F). While September records 40 mm (1.6 in) of precipitation over 9 days, May has higher rainfall at 70 mm (2.7 in) spread across 13 days, coupled with slightly higher humidity levels at 82% compared to September's 76%. For a detailed look at the climate in May, you can check out Saint-Denis weather in May.

In comparing the weather of September and June, we find that September tends to be slightly warmer during the day, with average temperatures reaching 16°C (62°F) and maximums hitting 33°C (91°F), whereas June has a slightly cooler average of 19°C (66°F) and peaks at 35°C (96°F). Both months experience a moderate amount of rainfall, but June receives more precipitation, totaling 74 mm (2.9 in) over 11 days compared to September's 40 mm (1.6 in) over 9 days. Humidity is relatively high in both months, with June at 80% and September at 76%. For a closer look at the June weather specifics, you can explore Saint-Denis weather in June.

When comparing the weather in September to July, we observe distinct differences in temperature and precipitation patterns. September features a broader temperature range, with a minimum of 4°C (40°F) and a maximum of 33°C (91°F), resulting in an average of 16°C (62°F). In contrast, July typically has warmer temperatures, with a minimum of 8°C (46°F), an average of 20°C (69°F), and a maximum soaring to 41°C (106°F). Precipitation is slightly lower in September at 40 mm (1.6 in) over 9 days, compared to July's 49 mm (1.9 in) over 8 days. The humidity levels are fairly comparable, with September averaging 76% and July at 73%. For more detailed insights, you can check Saint-Denis weather in July.

September weather exhibits a broader temperature range compared to August, with minimums dropping to 4°C (40°F) and maximums reaching up to 33°C (91°F). In contrast, August remains warmer overall, with minimum temperatures at 7°C (44°F) and highs peaking at 37°C (99°F). However, August sees more precipitation, totaling 58 mm (2.3 in) over 9 days, while September experiences slightly less with 40 mm (1.6 in) across the same number of days. Additionally, humidity levels are higher in September at 76%, compared to August's relatively comfortable 68%. For more details on August weather, you can check Saint-Denis weather in August.

September and October present a notable transition in weather patterns. In September, temperatures range from a minimum of 4°C (40°F) to a maximum of 33°C (91°F), with an average of 16°C (62°F), and the month experiences 40 mm of precipitation over 9 days at a humidity level of 76%. In contrast, October brings cooler temperatures, with a minimum of 2°C (36°F), an average of 13°C (55°F), and a maximum of 26°C (78°F). Precipitation increases to 78 mm over 12 days, and humidity rises to 88%. As autumn progresses, the days become not only chillier but also wetter, marking a significant shift in the climate. For more detailed insights, check out Saint-Denis weather in October.

September and November present contrasting weather characteristics. In September, temperatures typically range from a mild 4°C (40°F) at night to a warm 33°C (91°F) during the day, with an average of 16°C (62°F) and relatively low precipitation of 40 mm (1.6 in) over about 9 days. Humidity levels are also moderate at 76%. In stark contrast, November experiences much cooler temperatures, with nighttime lows dropping to -3°C (27°F) and daytime highs reaching 19°C (66°F), leading to an average of just 8°C (46°F). Precipitation increases significantly to 66 mm (2.6 in) over 14 days, and humidity rises to 92%. For more detailed information, you can check Saint-Denis weather in November.

Comparing the weather in September and December reveals significant changes. September enjoys milder temperatures, with an average of 16°C (62°F) and maximums reaching 33°C (91°F), alongside relatively lower humidity at 76% and only 40 mm of precipitation over 9 days. In contrast, December brings a much chillier climate, with average temperatures dropping to 6°C (43°F) and maximums only reaching 15°C (60°F). The month is also wetter, with 102 mm of rainfall occurring over 16 days and a higher humidity level of 93%. For more specific details, you can check Saint-Denis weather in December.

Compare Saint-Denis's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Saint-Denis

As summer fades and autumn begins, September in Saint-Denis offers a unique shift in weather characterized by pleasantly warm temperatures and moderate humidity. While maximum temperatures can soar up to 33°C (91°F), the cooler average lows of 16°C (62°F) provide a refreshing contrast, making it an ideal time for outdoor activities. Precipitation, though present with about 40 mm spread over nine days, tends to be less than in the rainy months that follow. This blend of warmth and occasional rain sets September apart from the extremes of both summer and winter. For a deeper dive into the weather patterns, explore Saint-Denis Climate.