Last updated: February 26, 2025
September in Chantilly, France is a month of delightful contrasts, where maximum temperatures can soar to a warm 33°C (91°F), while average conditions settle around a comfortable 16°C (62°F). As early autumn approaches, the minimum temperatures can dip to a cool 4°C (40°F), offering a refreshing change. Visitors can expect light rain, with precipitation totaling about 37 mm (1.4 in) over approximately 8 days of the month, creating a moist environment with an average humidity level of 76%. This blend of warmth and fresh air makes September an inviting time to explore the scenic beauty of Chantilly.
As summer transitions to autumn in Chantilly, September offers a mild and refreshing climate. With temperatures ranging from a minimum of 4°C (40°F) to a comfortable average of 16°C (62°F), the month provides a pleasant escape from the sweltering heat of July and August. Max temperatures can still reach up to 33°C (91°F), making early September ideal for enjoying the last warm days. As the days shorten and the air cools, the inviting ambiance of Chantilly welcomes visitors to relish in its beautiful parks and historical sites, all while dressed for a crisp, invigorating atmosphere.
In September, Chantilly, France, experiences a notable drop in precipitation with an average of 37 mm (1.4 in) spread over 8 days. This marks a transition into autumn, as the summer months display higher precipitation levels, peaking in August at 64 mm (2.5 in). The relatively drier September not only signals a shift in the weather pattern but also sets the stage for the wetter months ahead, with October typically bringing a significant rise to 79 mm (3.1 in). This pattern highlights the gradual transition from the humid summer to the more unpredictable, rainy autumn, exhibited by both the amount and frequency of rainfall in the region.
As summer transitions to autumn in Chantilly, France, September experiences a noticeable shift in humidity levels, settling at 76%. This marks an increase from the drier months of July and August, which reported 73% and 68% respectively. While September's humidity is still lower than the early months of the year, it hints at the approaching wetter season, as October jumps back up to a robust 88%. This trend underscores the gradual transition from the warmth of summer to the cooler, more humid conditions typical of the fall and winter months, where humidity levels often rise, peaking at 93% in December.
As September unfolds in Chantilly, France, the UV Index settles at a moderate 6, indicating a high exposure category that signals the need for sun protection. This marks a shift from the intense very high levels prevalent during the summer months of July and August, where burn time was as brief as 15 minutes. However, as the season transitions, one can enjoy slightly longer exposure without risk: approximately 25 minutes before the effects of UV rays are felt. The trend showcases a gradual decline in UV intensity from the peak of 9 in June to this September reading—though caution is still warranted to maintain skin health. For more detailed insights, visit Chantilly UV Index.
UV Risk Categories
As the summer haze starts to wear off, September in Chantilly, France offers a delightful transition into autumn with 323 hours of sunshine. This month enjoys a substantial amount of sunlight, reflecting a notable dip from the peak of summer yet still trailing behind the vibrant energy of May, June, and July. The gradual decrease in sunshine hours hints at the changing seasons, while September still captures the essence of summer's warmth. It beautifully blends lingering sunny days with the crispness of autumn, making it an ideal time to explore the charming landscapes and historic sites of this enchanting town before the shorter days of October set in.
In Chantilly, France, the likelihood of sunny weather in September stands at a moderate 38%, reflecting a gradual increase in sunshine as summer transitions to autumn. This trend follows a promising trajectory, starting from a mere 14% in January and peaking at 57% in April. While May and the summer months record slightly lower chances of sun, September retains a fair balance, indicating that early autumn can still offer delightful sunny days. Additionally, as the month approaches, the probabilities rise slightly into October at 40%, hinting that while summer may be on the wane, there’s still ample opportunity to savor the sun.
As summer fades into autumn, September in Chantilly, France, marks a gentle transition in daylight duration, offering about 12 hours of sunlight each day. This decrease from the peak of 16 hours in June illustrates the gradual shortening of days as the year wanes. Following the vibrant months of late spring and early summer, September showcases a balance of light, lingering warmth, and the first whispers of fall. The trend continues downward into October, where daylight dips to 10 hours, signaling that the enchanting glow of summer is yielding to shorter, cozier days filled with the rich hues of autumn.
As September graces Chantilly, France, the gentle whispers of the wind slow to an average speed of 2.8 m/s (6 mph), marking a noticeable shift from the summer's breezier days. This decline continues the trend observed from the earlier months, with July and August both reaching 3.3 m/s (7 mph), indicating a pattern of reduced wind, likely a precursor to the calm that autumn brings. Interestingly, this month stands out as the most tranquil since June, which recorded the year’s lowest winds at 2.7 m/s (6 mph). As nature prepares for the cooler months ahead, the serene winds of September invite reflection and anticipation, weaving a tapestry of change in this picturesque landscape.
The weather in Chantilly 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 Chantilly and find detailed weather information for every month.
September and January showcase markedly different 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). This month experiences relatively mild conditions with 37 mm (1.4 in) of precipitation over 8 days and humidity averaging around 76%. In contrast, January presents a much colder climate, with temperatures dipping as low as -7°C (20°F) and reaching a maximum of 14°C (58°F), averaging only 4°C (40°F). Precipitation increases to 59 mm (2.3 in) over 10 days, resulting in higher humidity levels at 91%. For a more detailed look at the January climate, visit Chantilly weather in January.
September and February exhibit significantly different weather patterns. September enjoys a wide temperature range, with minimums around 4°C (40°F) and maximums soaring up to 33°C (91°F), resulting in a warm average of 16°C (62°F). In contrast, February experiences much colder temperatures, starting as low as -7°C (21°F) and peaking at only 19°C (66°F), yielding a much cooler average of 6°C (43°F). Additionally, February sees more rain, with 69 mm (2.7 in) falling over 13 days, compared to September’s 37 mm (1.4 in) across 8 wet days. The humidity also rises in February, reaching 89%, compared to 76% in September. For more details about the weather specifics in February, check out Chantilly weather in February.
In September, the weather in Chantilly is generally warm, with average temperatures ranging from a cool 16°C (62°F) to a hot 33°C (91°F), while March experiences a much cooler climate with temperatures averaging between -8°C (17°F) and 23°C (74°F). September sees less rainfall at 37 mm (1.4 in) over about 8 days, compared to March, which has a higher precipitation level of 73 mm (2.9 in) over 14 days, leading to a wetter atmosphere. Additionally, humidity is relatively high in both months, with September at 76% and March slightly higher at 85%. For a detailed look at March weather, you can visit Chantilly weather in March.
When comparing the weather in September and April, notable differences arise. September typically boasts a much warmer temperature range, with minimums around 4°C (40°F) and maximums reaching up to 33°C (91°F), while April's temperatures are cooler, with a minimum of -2°C (28°F) and a maximum of 27°C (80°F). Precipitation levels are fairly similar, with September averaging 37 mm (1.4 in) over 8 days and April slightly lower at 34 mm (1.3 in) over 6 days. Humidity in April is marginally higher at 84%, compared to September's 76%. For more detailed insights, check out Chantilly weather in April.
When comparing the weather in September and May, notable differences emerge in temperature and precipitation. 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). The month sees relatively low precipitation, totaling 37 mm (1.4 in) over approximately 8 days and a humidity level of 76%. In contrast, May experiences cooler temperatures, with a minimum of 0°C (32°F) and a maximum of 29°C (85°F), averaging 14°C (57°F). However, it has higher precipitation of 68 mm (2.7 in) across 14 days, coupled with slightly higher humidity at 82%. For a detailed look at the weather patterns during this time, you can check Chantilly weather in May.
In September, the weather offers a pleasant transition into autumn, with temperatures ranging from a minimum of 4°C (40°F) to a maximum of 33°C (91°F) and an average of 16°C (62°F). This month experiences moderate precipitation, totaling 37 mm (1.4 in) over about 8 days, alongside a humidity level of 76%.
Conversely, June tends to be warmer, with temperatures starting at a minimum of 6°C (44°F) and peaking at 35°C (95°F), averaging 18°C (65°F). It also faces more precipitation, with 63 mm (2.5 in) falling across 11 days and a slightly higher humidity level of 80%. Overall, June is warmer and wetter, while September brings cooler temperatures and less rainfall. For more detailed information about June weather, you can check Chantilly weather in June.
In comparing the weather of September and July, we observe notable differences in both temperature and precipitation. September experiences a broader temperature range, with minimums dropping to 4°C (40°F) while still allowing for warmer days with maximums reaching up to 33°C (91°F). This month averages around 16°C (62°F) and sees about 37 mm (1.4 in) of precipitation over eight days, combined with relatively high humidity at 76%. Conversely, July tends to be warmer overall, boasting a higher minimum temperature of 8°C (47°F) and an average of 20°C (68°F), with maximums soaring to 41°C (106°F). Precipitation is slightly greater in July at 49 mm (1.9 in) across the same number of rainy days, yet humidity is marginally lower at 73%. For a more detailed look into July's conditions, you can refer to Chantilly weather in July.
In comparison to August, September experiences a noticeable shift in weather patterns. The average temperature drops from August's 19°C (67°F) to 16°C (62°F), with September's maximum temperature peaking at a cooler 33°C (91°F) compared to August's highs of 38°C (100°F). Additionally, while August has more precipitation at 64 mm (2.5 in) over 11 days, September sees only 37 mm (1.4 in) with rainfall on 8 days, indicating a relatively drier month. Humidity levels also rise in September to 76%, up from August's 68%, contributing to a different feel in the air. For more details on August weather, check Chantilly weather in August.
September and October exhibit notable differences in weather patterns. September typically experiences a wider range of temperatures, with minimums around 4°C (40°F) and maximums reaching up to 33°C (91°F), resulting in an average temperature of 16°C (62°F). In contrast, October sees cooler temperatures, with lows of 1°C (35°F) and highs peaking at 25°C (78°F), leading to a lower average of 12°C (55°F). Additionally, October tends to be wetter, with nearly double the precipitation at 79 mm (3.1 in) over 13 days, compared to September's 37 mm (1.4 in) over just 8 days. Humidity also rises in October, averaging 88% compared to 76% in September. For more detailed information, you can check Chantilly weather in October.
September weather is characterized by a significant range in temperature, with minimums of 4°C (40°F) and maximums reaching up to 33°C (91°F), resulting in an average of 16°C (62°F). This month experiences relatively low precipitation at 37 mm (1.4 in) over about 8 days, and the humidity stands at 76%. In contrast, November brings much cooler temperatures, with a minimum of -3°C (28°F) and an average of 8°C (46°F), peaking at 19°C (67°F). The month is also wetter, with 70 mm (2.7 in) of precipitation spread over 13 days and higher humidity at 92%. For more detailed information, you can check Chantilly weather in November.
In September, the weather is generally warm and variable, with temperatures ranging from a mild 4°C (40°F) at night to a scorching 33°C (91°F) during the day, accompanied by 37 mm (1.4 in) of rainfall over about 8 days. The humidity averages around 76%, adding to the overall warmth of the month. In contrast, December brings a chillier climate, with minimum temperatures dropping to -3°C (27°F) and daytime highs reaching only 15°C (59°F). Precipitation significantly increases to 102 mm (4.0 in) spread across 16 days, and humidity is higher at 93%, creating a more overcast and damp atmosphere. To learn more about the specifics of December weather, check out Chantilly weather in December.
September in Chantilly marks a transition from the warmth of summer to the crispness of autumn. With its average temperature of 16°C, this month is pleasantly mild, providing a welcome respite from the higher summer peaks and hinting at cooler days ahead. Though rainfall is moderate, with about eight days of precipitation, the overall humidity remains high, adding a certain freshness to the air. As the lush landscapes begin to change, September invites you to experience the beauty of Chantilly's natural surroundings before winter sets in. For more insights on Chantilly's weather patterns, explore Chantilly Climate.