Last updated: August 23, 2025
In January, the average temperature in Boulogne-sur-Mer, France hovers around 6°C (43°F), with a minimum of -3°C (27°F) and a pleasant maximum of 14°C (57°F). Expect notable precipitation of 81 mm (3.2 in) over 13 days, coupled with a high average humidity of 91%. Prepare accordingly for this chilly, damp month!
In January in Boulogne-sur-Mer, the average temperature is 6°C (43°F), with maximums reaching 14°C (57°F) and minimums dropping as low as -3°C (27°F). Be prepared for chilly days and layer your clothing if you're planning to travel during this time.
In Boulogne-sur-Mer in January, the precipitation amount is 81 mm (3.2 in) over the course of 13 days.
In Boulogne-sur-Mer in January, humidity is 91%. With an average temperature of 6°C (43°F), this humidity feels like a thick blanket wrapped around you, making travel uncomfortable and sticky as every step becomes a challenge against the heavy, damp air.
In Boulogne-sur-Mer in January, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Boulogne-sur-Mer, you can visit 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 January’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 |