Lannion in Summer
In summer (June, July and August), Lannion sees average daytime highs around 17°C and overnight lows near 14°C, with 140 mm of rain over about 27 wet days across the season. It is the warmest season of the year and the driest season of the year.
Over the season highs climb from about 15°C in early June to 18°C by late August. The sky is clear or mostly clear about 29% of the time across summer, and the air most often feels comfortable.
Summer is Lannion's best season of the year to visit on our travel score. For the whole year in context, see Lannion's year-round climate.
- Avg daytime high
- 17°C
- warmest season of the year
- Avg overnight low
- 14°C
- Rainfall
- 140 mm
- 27 wet days
- Avg wind
- 18 km/h
- Travel score
- 5.7
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Lannion in Summer
Over the season highs climb from about 15°C in early June to 18°C by late August.
A typical summer day in Lannion reaches about 17°C and drops to 14°C overnight. The warmest of the three months is August, the coolest June.
Lannion weather by month
How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 9° / 7° | 104 | 16.4 | 8.5 | 1.7 |
| Feb | 9° / 6° | 87 | 14.2 | 9.8 | 1.6 |
| Mar | 10° / 7° | 70 | 13.3 | 11.6 | 2.1 |
| Apr | 12° / 8° | 70 | 11.7 | 13.4 | 2.8 |
| May | 14° / 11° | 59 | 10.4 | 15 | 3.9 |
| Jun | 16° / 13° | 48 | 8.7 | 15.9 | 5.1 |
| Jul | 18° / 15° | 42 | 9 | 15.5 | 6.0 |
| Aug | 18° / 15° | 50 | 9.5 | 14.2 | 6.1 |
| Sep | 17° / 14° | 55 | 10 | 12.4 | 5.5 |
| Oct | 15° / 12° | 97 | 15 | 10.5 | 4.0 |
| Nov | 12° / 10° | 116 | 17.3 | 9 | 2.6 |
| Dec | 10° / 8° | 128 | 17.5 | 8.1 | 1.9 |
Cloud cover in Summer
The sky is clear or mostly clear about 29% of the time across summer.
Chance of precipitation in Summer
Lannion gets around 140 mm of rain over 27 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels comfortable — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 18 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 15 h 36 min in early June to 13 h 18 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 5.6 kWh/m².
Is summer a good time to visit Lannion?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a reasonable time to visit Lannion for sightseeing.
What to pack for Lannion in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Lannion sees daytime highs around 17°C and nights near 14°C. Pack sun protection. Worth having: a warm layer and rain gear. About 27 days see rain.
Sea temperature near Lannion in Summer
The nearest coast averages about 15°C across summer — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 17 km away) is warmest in August at about 17°C and coldest in March near 9°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) | 11 | 10 | 9 | 10 | 12 | 14 | 16 | 17 | 17 | 16 | 14 | 12 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Cool | Cool | Cool | Bracing | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 11 | Bracing |
| Feb | 10 | Bracing |
| Mar | 9 | Bracing |
| Apr | 10 | Bracing |
| May | 12 | Bracing |
| Jun | 14 | Bracing |
| Jul | 16 | Cool |
| Aug | 17 | Cool |
| Sep | 17 | Cool |
| Oct | 16 | Cool |
| Nov | 14 | Bracing |
| Dec | 12 | Bracing |
UV index in Lannion in Summer
Clear-sky midday UV across summer averages around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Lannion peaks around August 12 at about 7 (high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near January 11 at about 1 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 1 | 3 | 5 | 6 | 7 | 6 | 7 | 5 | 3 | 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 | 5 | Moderate |
| May | 6 | High |
| Jun | 7 | High |
| Jul | 6 | High |
| Aug | 7 | High |
| Sep | 5 | Moderate |
| Oct | 3 | Moderate |
| Nov | 1 | Low |
| Dec | 1 | Low |
Where is Lannion?
Lannion sits at 48.7°N, 3.5°W, 30 m above sea level, in France. The nearest listed city is Morlaix, 32 km away.
Topography around Lannion
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Lannion.
Within 3 km, the terrain around Lannion has only modest variations in elevation — a maximum elevation change of 108 m around an average of 63 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 186 m; within 80 km, significant variations in elevation — a maximum elevation change of 381 m.
The land around Lannion is covered by trees (41%) and grassland (23%) within 3 km, trees (27%), water (27%) and cropland (23%) within 16 km, and water (41%), cropland (22%) and trees (21%) 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 Lannion (48.7326°, -3.4566°, elevation 30 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.