Last updated: August 23, 2025
In Chatillon-sur-Seine, France, the average temperature in September hovers around 16°C (62°F). Expect a range with the minimum dipping to 3°C (38°F) and the maximum soaring up to 34°C (93°F). During this month, anticipate approximately 55 mm (2.2 in) of precipitation over 9 days, with an average humidity level of 78%. Be prepared for a mix of weather!
In September in Chatillon-sur-Seine, the average temperature is 16°C (62°F). The maximum can reach 34°C (93°F), and the minimum can be as low as 3°C (38°F). This diverse temperature range makes it essential for travelers to pack layers to ensure comfort throughout their stay.
In Chatillon-sur-Seine in September, the precipitation amount is 55 mm (2.2 in) over a span of 9 days.
In Chatillon-sur-Seine in September, humidity is 78%. With an average temperature of 16°C (62°F), this humidity feels like a warm blanket wrapping around you, making outdoor activities enjoyable yet slightly sticky. Travelers may find the weather pleasantly mild, though they'll appreciate having light, breathable clothing on hand to stay comfortable while exploring.
In Chatillon-sur-Seine in September, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Chatillon-sur-Seine, you can refer to this Hourly UV Index in Chatillon-sur-Seine.
UV Risk Categories
Weather in Chatillon-sur-Seine varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Chatillon-sur-Seine, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 3°C (38°F) | 93 mm (3.6 inches) | 91% | low |
| February Weather | 5°C (42°F) | 78 mm (3.1 inches) | 89% | moderate |
| March Weather | 7°C (46°F) | 88 mm (3.5 inches) | 86% | moderate |
| April Weather | 11°C (52°F) | 39 mm (1.6 inches) | 84% | high |
| May Weather | 14°C (57°F) | 85 mm (3.4 inches) | 82% | very high |
| June Weather | 19°C (66°F) | 77 mm (3.0 inches) | 82% | very high |
| July Weather | 20°C (69°F) | 61 mm (2.4 inches) | 79% | very high |
| August Weather | 20°C (68°F) | 48 mm (1.9 inches) | 72% | very high |
| September Weather | 16°C (62°F) | 55 mm (2.2 inches) | 78% | high |
| October Weather | 12°C (54°F) | 81 mm (3.2 inches) | 88% | moderate |
| November Weather | 7°C (44°F) | 77 mm (3.0 inches) | 91% | low |
| December Weather | 5°C (41°F) | 143 mm (5.6 inches) | 93% | low |