Last updated: August 23, 2025
In Boulogne-sur-Mer, France, the average temperature in December hovers around 8°C (46°F). Expect chilly days, with minimums dipping to -1°C (31°F) and maximums reaching 14°C (57°F). Rainfall can be significant, with an average precipitation of 143 mm (5.6 in) spread over 19 days, resulting in a notably high average humidity of 92%. Be prepared for a damp and cool atmosphere!
In December in Boulogne-sur-Mer, the average temperature is 8°C (46°F), with maximums reaching 14°C (57°F) and minimums dropping as low as -1°C (31°F). It's a good idea to pack layers and prepare for varying weather conditions during your travels.
In Boulogne-sur-Mer in December, the total precipitation amount is 143 mm (5.6 in) spread over 19 days.
In Boulogne-sur-Mer in December, humidity is 92%. With an average temperature of 8°C (46°F), this humidity feels like a damp chill that settles deep into your bones, making outdoor adventures uncomfortable and necessitating extra layers to stay warm while you explore.
In Boulogne-sur-Mer in December, the maximum UV index is 1, which corresponds to a low Exposure Category. This means you have a time to burn of 45 minutes. For more details, 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 December’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 |