Last updated: August 23, 2025
In Mantes-la-Jolie, France, the average temperature in September hovers around 16°C (61°F). Expect a minimum of 4°C (40°F) and a steamy maximum of 32°C (91°F). During this month, anticipate about 40 mm (1.6 in) of precipitation over roughly 8 days. With an average humidity of 76%, it’s a perfect time to embrace the climate—whether you're exploring or relaxing!
In September in Mantes-la-Jolie, the average temperature is 16°C (61°F), with maximums reaching 32°C (91°F) and minimums dropping as low as 4°C (40°F). This wide temperature range makes Mantes-la-Jolie an ideal destination for travelers looking to experience a variety of climates.
In Mantes-la-Jolie in September, the precipitation amount is 40 mm (1.6 in), occurring over a span of 8 days.
In Mantes-la-Jolie in September humidity is 76%. With an average temperature of 16°C (61°F), this humidity feels like a warm embrace that makes traveling feel slightly heavy yet refreshing, often prompting you to seek shade or indulge in ice-cold drinks to stay comfortable.
In Mantes-la-Jolie 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 Mantes-la-Jolie, you can refer to this Hourly UV Index in Mantes-la-Jolie.
UV Risk Categories
Weather in Mantes-la-Jolie varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Mantes-la-Jolie, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 5°C (41°F) | 53 mm (2.1 inches) | 91% | low |
| February Weather | 6°C (43°F) | 66 mm (2.6 inches) | 89% | moderate |
| March Weather | 8°C (47°F) | 77 mm (3.0 inches) | 85% | moderate |
| April Weather | 11°C (51°F) | 36 mm (1.4 inches) | 84% | high |
| May Weather | 14°C (57°F) | 78 mm (3.1 inches) | 82% | very high |
| June Weather | 18°C (65°F) | 81 mm (3.2 inches) | 80% | very high |
| July Weather | 20°C (68°F) | 46 mm (1.8 inches) | 73% | very high |
| August Weather | 19°C (67°F) | 59 mm (2.3 inches) | 68% | very high |
| September Weather | 16°C (61°F) | 40 mm (1.6 inches) | 76% | high |
| October Weather | 13°C (55°F) | 78 mm (3.1 inches) | 88% | moderate |
| November Weather | 8°C (46°F) | 67 mm (2.6 inches) | 92% | low |
| December Weather | 6°C (43°F) | 100 mm (4.0 inches) | 93% | low |