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Monthly climate in Boulogne-sur-Mer, Hauts-de-France, France

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Boulogne-sur-Mer features a oceanic climate (Cfb).Temperatures typically range between 6 °C (43 °F) and 18 °C (65 °F) through the year, but rarely can drop to -5 °C (23 °F) or can rise to as high as 34 °C (93 °F).The average annual precipitation amounts to about 947 mm (37.3 inches) and receives 154 rainy days on the 1 mm (0.04 inches) threshold annually.Boulogne-sur-Mer enjoys an average of 3566 hours of sunshine throughout the year, and daylight varies from 8 hours 0 minutes to 16 hours 25 minutes per day.

Monthly average temperatures in Boulogne-sur-Mer, Hauts-de-France, France §

The warmest months in Boulogne-sur-Mer are July, August and September, with daily mean temperatures ranging from 16 to 18 °C (61 - 65 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 6 to 8 °C (43 - 46 °F) throughout the day. On average each year, Boulogne-sur-Mer experiences 4 days above 25 °C (77.0 °F) and 5 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Boulogne-sur-Mer, Hauts-de-France, France.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 14°C
(57°F)		 15°C
(59°F)		 19°C
(67°F)		 20°C
(69°F)		 23°C
(74°F)		 29°C
(84°F)		 34°C
(93°F)		 31°C
(89°F)		 26°C
(79°F)		 23°C
(74°F)		 18°C
(64°F)		 14°C
(57°F)
Mean maximum 12°C
(54°F)		 13°C
(55°F)		 16°C
(60°F)		 19°C
(66°F)		 21°C
(70°F)		 24°C
(75°F)		 27°C
(81°F)		 26°C
(79°F)		 24°C
(75°F)		 20°C
(69°F)		 16°C
(61°F)		 13°C
(56°F)
Average high 8°C
(46°F)		 8°C
(47°F)		 10°C
(50°F)		 12°C
(54°F)		 15°C
(59°F)		 18°C
(65°F)		 20°C
(68°F)		 20°C
(68°F)		 18°C
(65°F)		 15°C
(60°F)		 11°C
(52°F)		 9°C
(49°F)
Daily mean 6°C
(43°F)		 7°C
(44°F)		 8°C
(46°F)		 10°C
(50°F)		 12°C
(54°F)		 16°C
(61°F)		 18°C
(64°F)		 18°C
(65°F)		 16°C
(61°F)		 13°C
(57°F)		 10°C
(49°F)		 8°C
(46°F)
Average low 4°C
(40°F)		 5°C
(41°F)		 6°C
(43°F)		 7°C
(45°F)		 10°C
(50°F)		 13°C
(56°F)		 15°C
(60°F)		 16°C
(61°F)		 14°C
(57°F)		 12°C
(53°F)		 8°C
(46°F)		 6°C
(43°F)
Mean minimum 0°C
(32°F)		 -1°C
(31°F)		 1°C
(34°F)		 2°C
(37°F)		 5°C
(42°F)		 10°C
(50°F)		 12°C
(54°F)		 13°C
(55°F)		 10°C
(50°F)		 7°C
(45°F)		 3°C
(38°F)		 1°C
(34°F)
Minimum -3°C
(27°F)		 -4°C
(25°F)		 -5°C
(23°F)		 1°C
(35°F)		 4°C
(39°F)		 9°C
(48°F)		 11°C
(52°F)		 11°C
(53°F)		 8°C
(46°F)		 5°C
(40°F)		 2°C
(35°F)		 -1°C
(31°F)

Compare climate in Boulogne-sur-Mer with other places

Compare temperature, precipitation, sunshine, UV index in Boulogne-sur-Mer, Hauts-de-France, France with other places around the world.

Monthly average precipitation in Boulogne-sur-Mer, Hauts-de-France, France §

Boulogne-sur-Mer usually has the most precipitation in October, November and December, with an average of 17 rainy days and 123 mm (4.9 inches) of precipitation per month.The driest months in Boulogne-sur-Mer are April, May and July. On average, 47 mm (1.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Boulogne-sur-Mer, Hauts-de-France, France.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 81 (3.2) 74 (2.9) 73 (2.9) 31 (1.2) 61 (2.4) 67 (2.6) 49 (1.9) 74 (2.9) 67 (2.7) 123 (4.8) 104 (4.1) 143 (5.6)
Average precipitation days (≥ 1 mm) 13 14 14 8 10 9 10 13 11 16 17 19

Monthly sunshine hours in Boulogne-sur-Mer, Hauts-de-France, France §

The sunniest months in Boulogne-sur-Mer are May, June and July, when the sun shines an average of 13 hours 35 minutes a day.Least sunny months in Boulogne-sur-Mer: January, February and December receive an average of 5 hours 21 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Boulogne-sur-Mer, Hauts-de-France, France.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 128 196 284 354 410 416 424 395 329 254 208 163
Mean daily daylight hours 8h 29m 10h 1m 11h 55m 13h 51m 15h 32m 16h 25m 15h 57m 14h 26m 12h 34m 10h 38m 8h 55m 8h 0m

Solar UV radiation in Boulogne-sur-Mer, Hauts-de-France, France §

Boulogne-sur-Mer experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 7 - 8, which corresponds to the High / Very High category of sun exposure.January, February and December are in the Low exposure category. In these months, the maximum values of the UV index do not exceed 2. For more detailed information, check out our hourly Boulogne-sur-Mer UV Index data.

Average daily maximum UV levels by month for Boulogne-sur-Mer, Hauts-de-France, France.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 2 2 4 5 7 8 8 7 5 4 2 1