Vannes weather in May

In May, Vannes sees average daytime highs of 17°C and overnight lows near 10°C, with 58 mm of rain across 11.1 wet days and about 14.9 hours of daylight. It is the 5th-warmest and 5th-wettest month of the year here.

Highs climb over the month, from about 16°C in the first days to 19°C by the end. The sky is clear or mostly clear about 18% of the time in May, and the air most often feels dry.

Daylight stretches from about 14 h 12 min at the start of May to 15 h 30 min by month's end. Set against the rest of the year, May is Vannes's 6th-clearest and 8th-windiest month. For the whole year in context, see Vannes's year-round climate.

Daytime high
17°
5th warmest
Overnight low
10°
7th coldest
Rainfall
58 mm
11.1 wet days
Daylight
14 h 54 min
5:40 AM – 8:35 PM
Cloud cover
66%
6th clearest
Wind
15 km/h
8th windiest
Solar energy
5.64 kWh/m²
Travel score
5.4
out of 10
Air quality
Good
PM2.5 8.9 µg/m³ · 2019

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

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 16°C in the first days to 19°C by the end.

A typical May day in Vannes reaches about 17°C in the afternoon and slips back to 10°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 14°C and 22°C. Set against its neighbours, May runs about 3°C warmer than April and about 3°C cooler than June.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
1169
2169
3169
4169
5169
6169
7169
8169
9179
10179
11179
12179
13179
141710
151710
161710
171810
181810
191810
201810
211810
221810
231810
241811
251911
261911
271911
281911
291911
301911
311911

How May really feels in Vannes

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.

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

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

Vannes weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan / 7411.38.71.7
Feb10° / 589.59.92.0
Mar12° / 5210.111.63.1
Apr14° / 571113.34.1
May17° / 10°5811.114.95.4
Jun20° / 13°478.415.76.4
Jul22° / 14°39815.47.1
Aug22° / 14°45814.17.0
Sep20° / 12°497.912.46.6
Oct16° / 10°7811.610.64.8
Nov12° / 7311.79.13.1
Dec10° / 8311.98.31.9

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 18% 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 64%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13169
23169
33268
43070
53070
63169
73169
83268
93367
103268
113268
123367
133367
143466
153466
163565
173664
183664
193763
203763
213862
223862
233961
243961
253961
263961
274159
284060
294060
304060
313961

Chance of precipitation in May

Any precipitation

Vannes gets around 58 mm of rain over 11.1 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 43% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
143
242
342
441
541
640
739
838
938
1037
1137
1237
1337
1436
1536
1636
1736
1835
1935
2035
2134
2234
2334
2433
2533
2633
2732
2832
2932
3032
3132

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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 87% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
19550
29550
39460
49370
59370
69370
79280
89280
99280
109190
119190
129190
139190
149190
159091
169091
1789101
1889101
1988111
2088111
2187121
2286131
2385141
2484151
2582162
2680182
2779192
2878202
2977212
3074233
3173243

Wind in May

Winds average 15 km/h in May.

Across May, daily wind ranges from about 14 km/h on the calmest days to 15 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
115light breeze
215light breeze
315light breeze
415light breeze
515light breeze
615light breeze
715light breeze
815light breeze
915light breeze
1015light breeze
1115light breeze
1215light breeze
1315light breeze
1415light breeze
1515light breeze
1615light breeze
1715light breeze
1815light breeze
1915light breeze
2015light breeze
2115light breeze
2215light breeze
2315light breeze
2415light breeze
2515light breeze
2615light breeze
2715light breeze
2815light breeze
2914light breeze
3014light breeze
3114light breeze

Sunrise & sunset in May

DaylightNight

Daylight runs from about 14 h 12 min at the start of May to 15 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 78 minutes over May. Sunrise moves from 6:02 AM to 5:25 AM, and sunset from 8:14 PM to 8:52 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.26:028:14
214.26:018:16
314.35:598:17
414.45:578:18
514.45:568:20
614.55:548:21
714.55:538:23
814.55:518:24
914.65:508:25
1014.65:488:27
1114.75:478:28
1214.75:458:29
1314.85:448:31
1414.85:438:32
1514.95:418:33
1614.95:408:35
1715.05:398:36
1815.05:378:37
1915.05:368:38
2015.15:358:40
2115.15:348:41
2215.25:338:42
2315.25:328:43
2415.25:318:44
2515.35:308:46
2615.35:298:47
2715.35:288:48
2815.45:278:49
2915.45:268:50
3015.45:268:51
3115.55:258:52

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.64 kWh/m².

For context, solar energy here swings from a low near 0.95 kWh/m² to a high of 6.11 kWh/m² in June across the year — May's 5.64 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.2Bright
25.2Bright
35.2Bright
45.2Bright
55.3Bright
65.3Bright
75.3Bright
85.4Bright
95.4Bright
105.4Bright
115.5Bright
125.5Bright
135.5Bright
145.6Bright
155.6Bright
165.6Bright
175.7Bright
185.7Bright
195.7Bright
205.8Bright
215.8Bright
225.8Bright
235.9Bright
245.9Bright
255.9Bright
265.9Bright
276.0Bright
286.0Bright
296.0Bright
306.0Bright
316.0Bright
Planning a trip in May

Is May a good time to visit Vannes?

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

5.4
Sightseeing
5th-best month of the year
1.5
Beach & pool
5th-best month of the year

May is a reasonable time to visit Vannes for sightseeing.

What to pack for Vannes in May

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

In May, Vannes sees daytime highs around 17°C and nights near 10°C. Worth packing: rain gear and sun protection. About 11 days see rain.

rain gearsun protection

Sea temperature near Vannes in May

The nearest coast averages about 14°C in May — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 27 km away) is warmest in August at about 18°C and coldest in February near 10°C.

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

10°15°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan10Bracing
Feb10Bracing
Mar10Bracing
Apr12Bracing
May14Bracing
Jun16Cool
Jul18Cool
Aug18Cool
Sep17Cool
Oct16Cool
Nov14Bracing
Dec12Bracing

UV index in Vannes in May

LowModerateHighVery highExtreme

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 Vannes peaks around August 10 at about 7 (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 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowAug 10UV 7Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar3Moderate
Apr5High
May6High
Jun7High
Jul7High
Aug7High
Sep5Moderate
Oct3Moderate
Nov1Low
Dec1Low
Location & terrain

Where is Vannes?

Vannes sits at 47.7°N, 2.8°W, 20 m above sea level, in France. The nearest listed city is Guérande, 44 km away.

Topography around Vannes

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Vannes.

Within 3 km, the terrain around Vannes has only modest variations in elevation — a maximum elevation change of 64 m around an average of 20 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 177 m; within 80 km, significant variations in elevation — a maximum elevation change of 395 m.

The land around Vannes is covered by artificial surfaces (40%) and trees (36%) within 3 km, trees (33%), grassland (27%) and cropland (20%) within 16 km, and water (33%), trees (24%) and cropland (23%) within 80 km.

3 km
64 m
16 km
177 m
80 km
395 m
treesgrasslandcroplandartificial surfaceswaterwetland
May weather nearby: Guérande 44 km · Lanester 45 km · Lorient 47 km · Pontivy 48 km · La Baule-Escoublac 50 km · Ploemeur 51 km · Saint-Nazaire 59 km · Concarneau 90 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 Vannes (47.6569°, -2.762°, elevation 20 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).