Climate almanac
Boulogne-sur-Mer
Hauts-de-France, France · 50.72°, 1.61°
What is the climate like in Boulogne-sur-Mer?
The best time to visit Boulogne-sur-Mer is typically June – August, with trip comfort peaking in July (7.2/10). Boulogne-sur-Mer is warmest in August, when daily highs average 69°F (20°C), and coolest in January, when lows fall to about 40°F (4°C). The wettest month is typically November and the driest is April; the year sees roughly 39 in (989 mm) of precipitation.
- Best time to visitJune – August — comfort peaks in July (7.2/10)
- Warmest monthAugust — average high 69°F (20°C)
- Coolest monthJanuary — average low 40°F (4°C)
- Wettest monthNovember (5.1 in (130 mm))
- Driest monthApril (2.0 in (50 mm))
- Annual precipitation39 in (989 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
- Records fromHayling Island, 45 km away (1959-2026)