Boulogne-sur-Mer weather in July

In July, Boulogne-sur-Mer sees average daytime highs of 19°C and overnight lows near 15°C, with 55 mm of rain across 10.2 wet days and about 15.8 hours of daylight. It is the 2nd-warmest and 9th-wettest month of the year here.

Highs climb over the month, from about 18°C in the first days to 20°C by the end. The sky is clear or mostly clear about 31% of the time in July, and the air most often feels comfortable.

Daylight stretches from about 16 h 12 min at the start of July to 15 h 12 min by month's end. Set against the rest of the year, July is Boulogne-sur-Mer's 1st-clearest and 11th-windiest month. For the whole year in context, see Boulogne-sur-Mer's year-round climate.

Daytime high
19°
2nd warmest
Overnight low
15°
11th coldest
Rainfall
55 mm
10.2 wet days
Daylight
15 h 48 min
5:04 AM – 8:55 PM
Cloud cover
57%
1st clearest
Wind
18 km/h
11th windiest
Solar energy
5.69 kWh/m²
Travel score
6.2
out of 10
Air quality
Moderate
PM2.5 11.8 µg/m³ · 2019

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in July

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 18°C in the first days to 20°C by the end.

A typical July day in Boulogne-sur-Mer reaches about 19°C in the afternoon and slips back to 15°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 23°C. Set against its neighbours, July runs about 2°C warmer than June and on par with August.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
11814
21814
31814
41814
51914
61914
71914
81914
91914
101914
111914
121915
131915
141915
151915
161915
171915
181915
191915
202015
212015
222015
232015
242015
252015
262015
272015
282015
292015
302015
312016

How July really feels in Boulogne-sur-Mer

Once humidity and wind are folded in, July averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

July sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Boulogne-sur-Mer weather by month

How July compares with the rest of the year at a glance. July is the 2nd-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 8814.30.98.20.9
Feb / 6411.60.99.71.0
Mar / 5310.80.511.51.9
Apr12° / 4810.1013.53.0
May14° / 10°5710.7015.24.2
Jun17° / 13°529.5016.25.5
Jul19° / 15°5510.2015.86.2
Aug20° / 15°7010.4014.36.2
Sep18° / 13°6911.2012.45.5
Oct15° / 11°10114.3010.43.9
Nov11° / 10715.90.18.72.2
Dec / 10614.70.77.81.3

Cloud cover in July

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% of the time in July, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 21% of July, with mostly cloudy or overcast conditions the remaining 49%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14852
24753
34852
44951
54852
64951
74951
84852
94951
104951
115050
125050
135149
145149
155149
165248
175248
185248
195248
205347
215347
225347
235347
245446
255446
265446
275446
285446
295446
305446
315446

Chance of precipitation in July

Any precipitation

Boulogne-sur-Mer gets around 55 mm of rain over 10.2 wet days in July. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 32% and peaks near 36% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
135
235
336
436
536
636
735
835
935
1034
1133
1233
1332
1431
1531
1630
1730
1829
1929
2029
2129
2229
2329
2429
2530
2630
2730
2830
2931
3031
3131

Humidity in July

DryComfortableHumidMuggyOppressiveMiserable

Most of July feels comfortable — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, July lands in the comfortable band about 55% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
149465
248475
346495
445505
544515
643516
742526
841536
940537
1039547
1138548
1237558
1336559
14355510
15345610
16335611
17325612
18315613
19305614
20295615
21285715
22265816
23255817
24255817
25245818
26235918
27226018
28216019
29206119
30196120
31196120

Wind in July

Winds average 18 km/h in July.

Across July, daily wind ranges from about 17 km/h on the calmest days to 18 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202531
Wind speed (km/h)Feels
118light breeze
218light breeze
318light breeze
418light breeze
518light breeze
618light breeze
718light breeze
818light breeze
918light breeze
1018light breeze
1118light breeze
1218light breeze
1318light breeze
1418light breeze
1518light breeze
1618light breeze
1718light breeze
1818light breeze
1918light breeze
2018light breeze
2117light breeze
2217light breeze
2317light breeze
2417light breeze
2517light breeze
2617light breeze
2717light breeze
2817light breeze
2917light breeze
3017light breeze
3117light breeze

Sunrise & sunset in July

DaylightNight

Daylight runs from about 16 h 12 min at the start of July to 15 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 60 minutes over July. Sunrise moves from 4:51 AM to 5:23 AM, and sunset from 9:03 PM to 8:36 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
116.24:519:03
216.24:519:03
316.24:529:03
416.24:529:02
516.14:539:02
616.14:549:02
716.14:559:01
816.14:569:01
916.14:579:00
1016.04:578:59
1116.04:588:59
1216.04:598:58
1315.95:008:57
1415.95:018:56
1515.95:038:56
1615.85:048:55
1715.85:058:54
1815.85:068:53
1915.75:078:52
2015.75:088:51
2115.75:108:49
2215.65:118:48
2315.65:128:47
2415.55:138:46
2515.55:158:45
2615.55:168:43
2715.45:188:42
2815.45:198:41
2915.35:208:39
3015.35:228:38
3115.25:238:36

Solar energy in July

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in July, about 5.69 kWh/m².

For context, solar energy here swings from a low near 0.71 kWh/m² to a high of 5.83 kWh/m² in June across the year — July's 5.69 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.9Bright
25.9Bright
35.9Bright
45.8Bright
55.8Bright
65.8Bright
75.8Bright
85.8Bright
95.8Bright
105.7Bright
115.7Bright
125.7Bright
135.7Bright
145.7Bright
155.7Bright
165.7Bright
175.7Bright
185.7Bright
195.7Bright
205.7Bright
215.7Bright
225.7Bright
235.7Bright
245.6Bright
255.6Bright
265.6Bright
275.6Bright
285.6Bright
295.5Bright
305.5Bright
315.5Bright
Planning a trip in July

Is July a good time to visit Boulogne-sur-Mer?

Our two travel scores rate July for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

6.2
Sightseeing
1st-best month of the year
2.8
Beach & pool
2nd-best month of the year

July is a reasonable time to visit Boulogne-sur-Mer for sightseeing.

What to pack for Boulogne-sur-Mer in July

From July's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In July, Boulogne-sur-Mer sees daytime highs around 19°C and nights near 15°C. Worth packing: rain gear and sun protection. About 10 days see rain.

rain gearsun protection

Sea temperature near Boulogne-sur-Mer in July

The nearest coast averages about 16°C in July — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in August at about 18°C and coldest in February near 8°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

5°10°15°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan9Bracing
Feb8Bracing
Mar8Bracing
Apr9Bracing
May11Bracing
Jun14Bracing
Jul16Cool
Aug18Cool
Sep18Cool
Oct16Cool
Nov13Bracing
Dec11Bracing

UV index in Boulogne-sur-Mer in July

LowModerateHighVery highExtreme

Clear-sky midday UV in July peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Boulogne-sur-Mer peaks around June 20 at about 6 (high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near January 1 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 6 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJun 20UV 6Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr4Moderate
May6High
Jun7High
Jul6High
Aug6High
Sep4Moderate
Oct2Moderate
Nov1Low
Dec1Low
Location & terrain

Where is Boulogne-sur-Mer?

Boulogne-sur-Mer sits at 50.7°N, 1.6°E, 43 m above sea level, in France. The nearest listed city is Outreau, 3.0 km away.

Topography around Boulogne-sur-Mer

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Boulogne-sur-Mer.

Within 3 km, the terrain around Boulogne-sur-Mer has only modest variations in elevation — a maximum elevation change of 187 m around an average of 54 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 274 m; within 80 km, significant variations in elevation — a maximum elevation change of 290 m.

The land around Boulogne-sur-Mer is covered by artificial surfaces (34%), trees (23%) and grassland (22%) within 3 km, water (42%) within 16 km, and water (45%) and cropland (31%) within 80 km.

3 km
187 m
16 km
274 m
80 km
290 m
treesgrasslandcroplandartificial surfacesbare terrainwater
July weather nearby: Outreau 3.0 km · Calais 30 km · Berck-Plage 36 km · Berck 36 km · Saint-Omer 46 km · Dover 49 km · Folkestone 51 km · Deal 57 km

France travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / E
230 V · 50 Hz
Prices
≈ 77% of US
price level, 2025
GDP per capita
$48,986
2025
Happiness
6.6 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
1.3
per 100k, 2023
Road deaths
5.1
per 100k/yr, 2019
Income group
High
World Bank
English
Moderate
EF EPI 539
Religion
Roman Catholic 47%none 33%Muslim 4%Protestant 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Boulogne-sur-Mer (50.7249°, 1.6137°, elevation 43 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).