Last updated: August 23, 2025
In August, the average temperature in Boulogne-sur-Mer, France is a pleasant 18°C (65°F). Expect a minimum of 11°C (53°F) and a maximum of 31°C (89°F), offering a nice range for outdoor activities. However, be prepared for some rain, as the region sees around 74 mm (2.9 in) of precipitation over 13 days. The air maintains an average humidity of 73%, adding to the region's unique charm.
In August in Boulogne-sur-Mer, the average temperature is 18°C (65°F). The maximum can reach 31°C (89°F) and the minimum can be as low as 11°C (53°F). This makes Boulogne-sur-Mer an ideal destination for travelers seeking mild weather with a mix of warm and cool days.
In Boulogne-sur-Mer in August, the precipitation amount is 74 mm (2.9 in) over the course of 13 days.
In Boulogne-sur-Mer in August, humidity is 73%. With an average temperature of 18°C (65°F), this humidity feels like a warm, slightly muggy embrace that can make exploring the outdoors a bit sticky, yet still pleasant for leisurely strolls and sightseeing.
In Boulogne-sur-Mer in August, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Boulogne-sur-Mer.
UV Risk Categories
Weather in Boulogne-sur-Mer varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in Boulogne-sur-Mer, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 6°C (43°F) | 81 mm (3.2 inches) | 91% | low |
| February Weather | 7°C (44°F) | 74 mm (2.9 inches) | 89% | low |
| March Weather | 8°C (46°F) | 73 mm (2.9 inches) | 86% | moderate |
| April Weather | 10°C (50°F) | 31 mm (1.2 inches) | 85% | moderate |
| May Weather | 12°C (54°F) | 61 mm (2.4 inches) | 82% | high |
| June Weather | 16°C (61°F) | 67 mm (2.6 inches) | 81% | very high |
| July Weather | 18°C (64°F) | 49 mm (1.9 inches) | 76% | very high |
| August Weather | 18°C (65°F) | 74 mm (2.9 inches) | 73% | high |
| September Weather | 16°C (61°F) | 67 mm (2.7 inches) | 80% | moderate |
| October Weather | 13°C (57°F) | 123 mm (4.8 inches) | 89% | moderate |
| November Weather | 10°C (49°F) | 104 mm (4.1 inches) | 92% | low |
| December Weather | 8°C (46°F) | 143 mm (5.6 inches) | 92% | low |