September Weather in Boulogne-sur-Mer

Last updated: March 2, 2024

The weather in Boulogne-sur-Mer, France, during September is characterized by an average temperature of 16°C (61°F). Highs can soar to 24°C (75°F), while lows may dip to 10°C (50°F). Typically, the humidity level in Boulogne-sur-Mer throughout September hovers around 80%.

10°C (50°F)

Minimum temperature

16°C (61°F)

Average temperature

24°C (75°F)

Maximum temperature

80%

Humidity

Precipitation and Sunshine hours

In September, Boulogne-sur-Mer averages 67 mm (2.7 inches) of rainfall, typically over the course of 11 rainy days. The month enjoys an average of 12 hours 34 minutes of daylight, with the sun shining for approximately 10 hours 58 minutes each day. Additionally, there is a 41% probability of sunny days during this period.

67 mm (2.7 inches)

Precipitation

11 rainy days

Rainy days

10 hours 58 minutes

Sunshine hours

41%

Chance of sun

UV Index

In September, the UV Index in Boulogne-sur-Mer reaches a maximum of 5, indicating a level of Moderate exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, during which unprotected skin may burn in as little as 30 minutes.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00
UVI	0	1	1	2	3	4	5	5	5	4	3	1	1
Exposure	Low				Moderate							Low
Time to burn	45 min				30 min							45 min