Boulogne-sur-Mer weather in May
In May, Boulogne-sur-Mer sees average daytime highs of 14°C and overnight lows near 10°C, with 57 mm of rain across 10.7 wet days and about 15.2 hours of daylight. It is the 6th-warmest and 8th-wettest month of the year here.
Highs climb over the month, from about 13°C in the first days to 16°C by the end. The sky is clear or mostly clear about 25% of the time in May, and the air most often feels dry.
Daylight stretches from about 14 h 30 min at the start of May to 15 h 54 min by month's end. Set against the rest of the year, May is Boulogne-sur-Mer's 5th-clearest and 9th-windiest month. For the whole year in context, see Boulogne-sur-Mer's year-round climate.
- Daytime high
- 14°
- 6th warmest
- Overnight low
- 10°
- 7th coldest
- Rainfall
- 57 mm
- 10.7 wet days
- Daylight
- 15 h 18 min
- 5:12 AM – 8:28 PM
- Cloud cover
- 63%
- 5th clearest
- Wind
- 19 km/h
- 9th windiest
- Solar energy
- 5.47 kWh/m²
- Travel score
- 4.2
- 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 May
Highs climb over the month, from about 13°C in the first days to 16°C by the end.
A typical May day in Boulogne-sur-Mer reaches about 14°C in the afternoon and slips back to 10°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 11°C and 19°C. Set against its neighbours, May runs about 3°C warmer than April and about 3°C cooler than June.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 13 | 13 | 13 | 13 | 13 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 16 | 16 | 16 | 16 | 16 |
| Avg low (°C) | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 13 | 9 |
| 2 | 13 | 9 |
| 3 | 13 | 9 |
| 4 | 13 | 9 |
| 5 | 13 | 9 |
| 6 | 14 | 9 |
| 7 | 14 | 9 |
| 8 | 14 | 9 |
| 9 | 14 | 9 |
| 10 | 14 | 9 |
| 11 | 14 | 9 |
| 12 | 14 | 10 |
| 13 | 14 | 10 |
| 14 | 14 | 10 |
| 15 | 14 | 10 |
| 16 | 14 | 10 |
| 17 | 15 | 10 |
| 18 | 15 | 10 |
| 19 | 15 | 10 |
| 20 | 15 | 10 |
| 21 | 15 | 10 |
| 22 | 15 | 11 |
| 23 | 15 | 11 |
| 24 | 15 | 11 |
| 25 | 15 | 11 |
| 26 | 15 | 11 |
| 27 | 16 | 11 |
| 28 | 16 | 11 |
| 29 | 16 | 11 |
| 30 | 16 | 11 |
| 31 | 16 | 11 |
How May really feels in Boulogne-sur-Mer
Once humidity and wind are folded in, May 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.
May 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 May compares with the rest of the year at a glance. May is the 6th-warmest and 8th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 7° / 4° | 88 | 14.3 | 0.9 | 8.2 | 0.9 |
| Feb | 7° / 4° | 64 | 11.6 | 0.9 | 9.7 | 1.0 |
| Mar | 9° / 5° | 53 | 10.8 | 0.5 | 11.5 | 1.9 |
| Apr | 12° / 7° | 48 | 10.1 | 0 | 13.5 | 3.0 |
| May | 14° / 10° | 57 | 10.7 | 0 | 15.2 | 4.2 |
| Jun | 17° / 13° | 52 | 9.5 | 0 | 16.2 | 5.5 |
| Jul | 19° / 15° | 55 | 10.2 | 0 | 15.8 | 6.2 |
| Aug | 20° / 15° | 70 | 10.4 | 0 | 14.3 | 6.2 |
| Sep | 18° / 13° | 69 | 11.2 | 0 | 12.4 | 5.5 |
| Oct | 15° / 11° | 101 | 14.3 | 0 | 10.4 | 3.9 |
| Nov | 11° / 8° | 107 | 15.9 | 0.1 | 8.7 | 2.2 |
| Dec | 8° / 5° | 106 | 14.7 | 0.7 | 7.8 | 1.3 |
Cloud cover in May
The sky is clear or mostly clear about 25% of the time in May.
Beyond those clear spells, partly cloudy skies cover about 17% of May, with mostly cloudy or overcast conditions the remaining 59%.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 39 | 39 | 39 | 38 | 39 | 40 | 40 | 40 | 40 | 41 | 41 | 41 | 41 | 41 | 41 | 42 | 42 | 43 | 43 | 43 | 43 | 43 | 43 | 43 | 42 | 42 | 42 | 42 | 42 | 41 | 41 |
| Cloudier (%) | 61 | 61 | 61 | 62 | 61 | 60 | 60 | 60 | 60 | 59 | 59 | 59 | 59 | 59 | 59 | 58 | 58 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 58 | 58 | 58 | 58 | 58 | 59 | 59 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 39 | 61 |
| 2 | 39 | 61 |
| 3 | 39 | 61 |
| 4 | 38 | 62 |
| 5 | 39 | 61 |
| 6 | 40 | 60 |
| 7 | 40 | 60 |
| 8 | 40 | 60 |
| 9 | 40 | 60 |
| 10 | 41 | 59 |
| 11 | 41 | 59 |
| 12 | 41 | 59 |
| 13 | 41 | 59 |
| 14 | 41 | 59 |
| 15 | 41 | 59 |
| 16 | 42 | 58 |
| 17 | 42 | 58 |
| 18 | 43 | 57 |
| 19 | 43 | 57 |
| 20 | 43 | 57 |
| 21 | 43 | 57 |
| 22 | 43 | 57 |
| 23 | 43 | 57 |
| 24 | 43 | 57 |
| 25 | 42 | 58 |
| 26 | 42 | 58 |
| 27 | 42 | 58 |
| 28 | 42 | 58 |
| 29 | 42 | 58 |
| 30 | 41 | 59 |
| 31 | 41 | 59 |
Chance of precipitation in May
Boulogne-sur-Mer gets around 57 mm of rain over 10.7 wet days in May. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 36% and peaks near 37% on the wettest days.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 37 | 37 | 36 | 36 | 36 | 35 | 35 | 35 | 35 | 35 | 35 | 35 | 35 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 35 | 35 | 35 | 35 | 35 | 35 | 35 | 35 |
| Rain chance (%) | |
|---|---|
| 1 | 37 |
| 2 | 37 |
| 3 | 36 |
| 4 | 36 |
| 5 | 36 |
| 6 | 35 |
| 7 | 35 |
| 8 | 35 |
| 9 | 35 |
| 10 | 35 |
| 11 | 35 |
| 12 | 35 |
| 13 | 35 |
| 14 | 36 |
| 15 | 36 |
| 16 | 36 |
| 17 | 36 |
| 18 | 36 |
| 19 | 36 |
| 20 | 36 |
| 21 | 36 |
| 22 | 36 |
| 23 | 36 |
| 24 | 35 |
| 25 | 35 |
| 26 | 35 |
| 27 | 35 |
| 28 | 35 |
| 29 | 35 |
| 30 | 35 |
| 31 | 35 |
Humidity in May
Most of May feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, May lands in the dry band about 94% of days. It rarely turns muggy — the humid and sticky bands barely register.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 99 | 99 | 98 | 98 | 97 | 97 | 96 | 96 | 96 | 96 | 95 | 95 | 95 | 95 | 95 | 95 | 95 | 94 | 94 | 94 | 93 | 93 | 92 | 92 | 91 | 90 | 89 | 88 | 87 | 86 | 85 |
| Comfortable (%) | 1 | 1 | 2 | 2 | 3 | 3 | 4 | 4 | 4 | 4 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 6 | 6 | 6 | 7 | 7 | 8 | 8 | 9 | 10 | 11 | 12 | 12 | 13 | 14 |
| Humid (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 |
| Dry (%) | Comfortable (%) | Humid (%) | |
|---|---|---|---|
| 1 | 99 | 1 | 0 |
| 2 | 99 | 1 | 0 |
| 3 | 98 | 2 | 0 |
| 4 | 98 | 2 | 0 |
| 5 | 97 | 3 | 0 |
| 6 | 97 | 3 | 0 |
| 7 | 96 | 4 | 0 |
| 8 | 96 | 4 | 0 |
| 9 | 96 | 4 | 0 |
| 10 | 96 | 4 | 0 |
| 11 | 95 | 5 | 0 |
| 12 | 95 | 5 | 0 |
| 13 | 95 | 5 | 0 |
| 14 | 95 | 5 | 0 |
| 15 | 95 | 5 | 0 |
| 16 | 95 | 5 | 0 |
| 17 | 95 | 5 | 0 |
| 18 | 94 | 6 | 0 |
| 19 | 94 | 6 | 0 |
| 20 | 94 | 6 | 0 |
| 21 | 93 | 7 | 0 |
| 22 | 93 | 7 | 0 |
| 23 | 92 | 8 | 0 |
| 24 | 92 | 8 | 0 |
| 25 | 91 | 9 | 0 |
| 26 | 90 | 10 | 0 |
| 27 | 89 | 11 | 0 |
| 28 | 88 | 12 | 0 |
| 29 | 87 | 12 | 1 |
| 30 | 86 | 13 | 1 |
| 31 | 85 | 14 | 1 |
Wind in May
Winds average 19 km/h in May.
Across May, daily wind ranges from about 18 km/h on the calmest days to 19 km/h at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 |
| Feels | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 19 | light breeze |
| 2 | 19 | light breeze |
| 3 | 19 | light breeze |
| 4 | 19 | light breeze |
| 5 | 19 | light breeze |
| 6 | 19 | light breeze |
| 7 | 19 | light breeze |
| 8 | 19 | light breeze |
| 9 | 19 | light breeze |
| 10 | 19 | light breeze |
| 11 | 19 | light breeze |
| 12 | 19 | light breeze |
| 13 | 19 | light breeze |
| 14 | 19 | light breeze |
| 15 | 19 | light breeze |
| 16 | 19 | light breeze |
| 17 | 19 | light breeze |
| 18 | 19 | light breeze |
| 19 | 19 | light breeze |
| 20 | 18 | light breeze |
| 21 | 18 | light breeze |
| 22 | 18 | light breeze |
| 23 | 18 | light breeze |
| 24 | 18 | light breeze |
| 25 | 18 | light breeze |
| 26 | 18 | light breeze |
| 27 | 18 | light breeze |
| 28 | 18 | light breeze |
| 29 | 18 | light breeze |
| 30 | 18 | light breeze |
| 31 | 18 | light breeze |
Sunrise & sunset in May
Daylight runs from about 14 h 30 min at the start of May to 15 h 54 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 84 minutes over May. Sunrise moves from 5:37 AM to 4:54 AM, and sunset from 8:04 PM to 8:47 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 14.5 | 14.5 | 14.6 | 14.6 | 14.7 | 14.7 | 14.8 | 14.9 | 14.9 | 15.0 | 15.0 | 15.1 | 15.1 | 15.2 | 15.2 | 15.3 | 15.3 | 15.4 | 15.4 | 15.5 | 15.5 | 15.5 | 15.6 | 15.6 | 15.7 | 15.7 | 15.7 | 15.8 | 15.8 | 15.8 | 15.9 |
| Sunrise (AM) | 5:37 | 5:35 | 5:33 | 5:31 | 5:30 | 5:28 | 5:26 | 5:24 | 5:23 | 5:21 | 5:19 | 5:18 | 5:16 | 5:15 | 5:13 | 5:12 | 5:10 | 5:09 | 5:08 | 5:06 | 5:05 | 5:04 | 5:03 | 5:01 | 5:00 | 4:59 | 4:58 | 4:57 | 4:56 | 4:55 | 4:54 |
| Sunset (PM) | 8:04 | 8:06 | 8:08 | 8:09 | 8:11 | 8:12 | 8:14 | 8:16 | 8:17 | 8:19 | 8:20 | 8:22 | 8:23 | 8:25 | 8:26 | 8:28 | 8:29 | 8:31 | 8:32 | 8:33 | 8:35 | 8:36 | 8:38 | 8:39 | 8:40 | 8:41 | 8:43 | 8:44 | 8:45 | 8:46 | 8:47 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 14.5 | 5:37 | 8:04 |
| 2 | 14.5 | 5:35 | 8:06 |
| 3 | 14.6 | 5:33 | 8:08 |
| 4 | 14.6 | 5:31 | 8:09 |
| 5 | 14.7 | 5:30 | 8:11 |
| 6 | 14.7 | 5:28 | 8:12 |
| 7 | 14.8 | 5:26 | 8:14 |
| 8 | 14.9 | 5:24 | 8:16 |
| 9 | 14.9 | 5:23 | 8:17 |
| 10 | 15.0 | 5:21 | 8:19 |
| 11 | 15.0 | 5:19 | 8:20 |
| 12 | 15.1 | 5:18 | 8:22 |
| 13 | 15.1 | 5:16 | 8:23 |
| 14 | 15.2 | 5:15 | 8:25 |
| 15 | 15.2 | 5:13 | 8:26 |
| 16 | 15.3 | 5:12 | 8:28 |
| 17 | 15.3 | 5:10 | 8:29 |
| 18 | 15.4 | 5:09 | 8:31 |
| 19 | 15.4 | 5:08 | 8:32 |
| 20 | 15.5 | 5:06 | 8:33 |
| 21 | 15.5 | 5:05 | 8:35 |
| 22 | 15.5 | 5:04 | 8:36 |
| 23 | 15.6 | 5:03 | 8:38 |
| 24 | 15.6 | 5:01 | 8:39 |
| 25 | 15.7 | 5:00 | 8:40 |
| 26 | 15.7 | 4:59 | 8:41 |
| 27 | 15.7 | 4:58 | 8:43 |
| 28 | 15.8 | 4:57 | 8:44 |
| 29 | 15.8 | 4:56 | 8:45 |
| 30 | 15.8 | 4:55 | 8:46 |
| 31 | 15.9 | 4:54 | 8:47 |
Solar energy in May
Average shortwave solar energy reaching the ground each day in May, about 5.47 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 — May's 5.47 kWh/m² sits near the top of that range.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 5.1 | 5.1 | 5.1 | 5.1 | 5.2 | 5.2 | 5.2 | 5.3 | 5.3 | 5.3 | 5.3 | 5.4 | 5.4 | 5.4 | 5.4 | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 | 5.6 | 5.6 | 5.6 | 5.6 | 5.6 | 5.6 | 5.6 | 5.6 | 5.7 | 5.7 | 5.7 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 5.1 | Bright |
| 2 | 5.1 | Bright |
| 3 | 5.1 | Bright |
| 4 | 5.1 | Bright |
| 5 | 5.2 | Bright |
| 6 | 5.2 | Bright |
| 7 | 5.2 | Bright |
| 8 | 5.3 | Bright |
| 9 | 5.3 | Bright |
| 10 | 5.3 | Bright |
| 11 | 5.3 | Bright |
| 12 | 5.4 | Bright |
| 13 | 5.4 | Bright |
| 14 | 5.4 | Bright |
| 15 | 5.4 | Bright |
| 16 | 5.5 | Bright |
| 17 | 5.5 | Bright |
| 18 | 5.5 | Bright |
| 19 | 5.5 | Bright |
| 20 | 5.5 | Bright |
| 21 | 5.6 | Bright |
| 22 | 5.6 | Bright |
| 23 | 5.6 | Bright |
| 24 | 5.6 | Bright |
| 25 | 5.6 | Bright |
| 26 | 5.6 | Bright |
| 27 | 5.6 | Bright |
| 28 | 5.6 | Bright |
| 29 | 5.7 | Bright |
| 30 | 5.7 | Bright |
| 31 | 5.7 | Bright |
Is May a good time to visit Boulogne-sur-Mer?
Our two travel scores rate May for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
May is a reasonable time to visit Boulogne-sur-Mer for sightseeing.
What to pack for Boulogne-sur-Mer in May
From May's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In May, Boulogne-sur-Mer sees daytime highs around 14°C and nights near 10°C. Worth packing: a warm layer, rain gear and sun protection. About 11 days see rain.
Sea temperature near Boulogne-sur-Mer in May
The nearest coast averages about 11°C in May — 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 9 | 8 | 8 | 9 | 11 | 14 | 16 | 18 | 18 | 16 | 13 | 11 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Cool | Cool | Cool | Bracing | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 9 | Bracing |
| Feb | 8 | Bracing |
| Mar | 8 | Bracing |
| Apr | 9 | Bracing |
| May | 11 | Bracing |
| Jun | 14 | Bracing |
| Jul | 16 | Cool |
| Aug | 18 | Cool |
| Sep | 18 | Cool |
| Oct | 16 | Cool |
| Nov | 13 | Bracing |
| Dec | 11 | Bracing |
UV index in Boulogne-sur-Mer in May
Clear-sky midday UV in May 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 1 | 3 | 4 | 6 | 7 | 6 | 6 | 4 | 2 | 1 | 1 |
| Level | Low | Low | Moderate | Moderate | High | High | High | High | Moderate | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 1 | Low |
| Mar | 3 | Moderate |
| Apr | 4 | Moderate |
| May | 6 | High |
| Jun | 7 | High |
| Jul | 6 | High |
| Aug | 6 | High |
| Sep | 4 | Moderate |
| Oct | 2 | Moderate |
| Nov | 1 | Low |
| Dec | 1 | Low |
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.
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
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).