Annual mean 12°C · wettest around November · prevailing wind W
Warmest
21.1 °C
Coldest
5.9 °C
Wettest
23%
Windiest
7.1 m/s
Prevailing
W
5.8 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
never good
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Boulogne-sur-Mer over the whole year is 12°C. August is the hottest month, with highs of about 21°C; January is the coldest, with lows of about 5°C. Boulogne-sur-Mer has no sharply defined rainy season: the chance of rain on a given day runs from 8% in July, the driest month, to 20% in November, the wettest. Winds in Boulogne-sur-Mer are highest in February, averaging 6.0 m/s (22 km/h), and lightest in September, at 4.5 m/s (16 km/h). The prevailing wind is from the W. The clearest skies in Boulogne-sur-Mer come in August, when the sky is typically 70% covered; December is the cloudiest month, at 84%.
Month by month Boulogne-sur-Mer climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
7°C
5°C
1°C
16%
80%
5.8 m/s
0
0
12
February
8°C
5°C
2°C
15%
78%
6.0 m/s
0
0
21
March
10°C
6°C
4°C
13%
77%
5.5 m/s
2
0
34
April
13°C
7°C
8°C
10%
70%
4.8 m/s
10
0
56
May
16°C
11°C
12°C
9%
74%
4.7 m/s
28
1
80
June
19°C
14°C
16°C
9%
76%
4.6 m/s
58
7
80
July
20°C
16°C
18°C
8%
74%
4.6 m/s
75
8
79
August
21°C
16°C
19°C
10%
70%
4.7 m/s
76
11
76
September
19°C
14°C
16°C
13%
74%
4.5 m/s
61
5
80
October
15°C
11°C
12°C
17%
78%
4.7 m/s
25
0
79
November
10°C
8°C
6°C
20%
81%
5.4 m/s
1
0
43
December
8°C
6°C
3°C
19%
84%
5.2 m/s
0
0
22
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Boulogne-sur-Mer weather by season
Year round, Boulogne-sur-Mer has days of about 7°C at their warmest in January, its coolest month, and 21°C in August, its warmest; the coolest hours of the day run from 5°C to 16°C through the year, and the average temperature over the year is 12°C around the clock. Rain is most likely around November and least likely around July. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Boulogne-sur-Mer weather in winterDecember to February
High 7°CLow 5°CRain 17%
Winter in Boulogne-sur-Mer has typical daily highs of about 7°C and lows of about 5°C, with a 17% chance of rain on a given day.
Boulogne-sur-Mer weather in springMarch to May
High 13°CLow 8°CRain 10%
Spring in Boulogne-sur-Mer has typical daily highs of about 13°C and lows of about 8°C, with a 10% chance of rain on a given day.
Boulogne-sur-Mer weather in summerJune to August
High 20°CLow 15°CRain 9%
Summer in Boulogne-sur-Mer has typical daily highs of about 20°C and lows of about 15°C, with a 9% chance of rain on a given day.
Boulogne-sur-Mer weather in autumnSeptember to November
High 15°CLow 11°CRain 17%
Autumn in Boulogne-sur-Mer has typical daily highs of about 15°C and lows of about 11°C, with a 17% chance of rain on a given day.
When is the rainy season in Boulogne-sur-Mer?
Boulogne-sur-Mer has no sharply defined rainy season: the chance of rain on a given day runs from 8% in July, the driest month, to 20% in November, the wettest.
What time of year is Boulogne-sur-Mer windiest?
Winds in Boulogne-sur-Mer are highest in February, averaging 6.0 m/s (22 km/h), and lightest in September, at 4.5 m/s (16 km/h). The prevailing wind is from the W.
What is the average temperature in Boulogne-sur-Mer year round?
The average temperature in Boulogne-sur-Mer over the whole year is 12°C. August is the hottest month, with highs of about 21°C; January is the coldest, with lows of about 5°C.