Vannes weather in August

In August, Vannes sees average daytime highs of 22°C and overnight lows near 14°C, with 45 mm of rain across 8 wet days and about 14.1 hours of daylight. It is the 1st-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 22°C through the month. The sky is clear or mostly clear about 27% of the time in August, and the air most often feels comfortable.

Daylight stretches from about 14 h 48 min at the start of August to 13 h 18 min by month's end. Set against the rest of the year, August is Vannes's 2nd-clearest and 12th-windiest month. For the whole year in context, see Vannes's year-round climate.

Daytime high
22°
1st warmest
Overnight low
14°
11th coldest
Rainfall
45 mm
8 wet days
Daylight
14 h 06 min
6:12 AM – 8:18 PM
Cloud cover
59%
2nd clearest
Wind
13 km/h
12th windiest
Solar energy
5.08 kWh/m²
Travel score
7.0
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 August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 22°C through the month.

A typical August day in Vannes reaches about 22°C in the afternoon and slips back to 14°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 27°C. Set against its neighbours, August runs on par with July and about 2°C warmer than September.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12315
22315
32315
42315
52315
62315
72314
82314
92314
102314
112314
122314
132214
142214
152214
162214
172214
182214
192214
202214
212214
222214
232214
242214
252214
262214
272214
282214
292213
302213
312213

How August really feels in Vannes

Once humidity and wind are folded in, August 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

August 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 August compares with the rest of the year at a glance. August is the 1st-warmest and 11th-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 August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 27% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 20% of August, with mostly cloudy or overcast conditions the remaining 53%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14555
24555
34555
44753
54753
64753
74753
84753
94753
104753
114852
124852
134753
144753
154753
164753
174654
184654
194555
204555
214654
224654
234753
244852
254852
264852
274951
284951
295050
305050
315149

Chance of precipitation in August

Any precipitation

Vannes gets around 45 mm of rain over 8 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 26% and peaks near 28% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
125
225
325
425
525
626
726
826
926
1027
1127
1227
1327
1427
1527
1628
1728
1828
1928
2027
2127
2227
2326
2425
2525
2624
2723
2823
2922
3022
3122

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the comfortable band about 44% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
12346292
22346293
32445283
42445283
52544283
62544283
72544283
82643283
92643283
102643273
112644273
122644273
132744263
142744263
152745263
162745252
172745252
182746252
192846242
202846242
212946232
223045232
233245222
243344211
253543201
263743191
273842191
284041181
294141171
304240161
314439161

Wind in August

Winds average 13 km/h in August, the calmest month.

Across August, daily wind ranges from about 13 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2314light breeze
2414light breeze
2514light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light breeze
3114light breeze

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 h 48 min at the start of August to 13 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 90 minutes over August. Sunrise moves from 5:52 AM to 6:33 AM, and sunset from 8:42 PM to 7:49 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.85:528:42
214.85:548:40
314.75:558:39
414.75:568:38
514.65:588:36
614.65:598:35
714.56:008:33
814.56:018:31
914.56:038:30
1014.46:048:28
1114.46:068:27
1214.36:078:25
1314.26:088:23
1414.26:108:21
1514.16:118:20
1614.16:128:18
1714.06:148:16
1814.06:158:14
1913.96:168:13
2013.96:188:11
2113.86:198:09
2213.86:218:07
2313.76:228:05
2413.76:238:03
2513.66:258:01
2613.66:267:59
2713.56:277:57
2813.46:297:55
2913.46:307:53
3013.36:327:51
3113.36:337:49

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.08 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 — August's 5.08 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.6Bright
25.5Bright
35.5Bright
45.5Bright
55.5Bright
65.4Bright
75.4Bright
85.4Bright
95.3Bright
105.3Bright
115.3Bright
125.2Bright
135.2Bright
145.2Bright
155.1Bright
165.1Bright
175.0Bright
185.0Bright
195.0Bright
204.9Bright
214.9Bright
224.9Bright
234.8Bright
244.8Bright
254.8Bright
264.7Bright
274.7Bright
284.7Bright
294.7Bright
304.6Bright
314.6Bright
Planning a trip in August

Is August a good time to visit Vannes?

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

7.0
Sightseeing
2nd-best month of the year
5.0
Beach & pool
2nd-best month of the year

August is one of the better times to visit Vannes for general sightseeing.

What to pack for Vannes in August

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

In August, Vannes sees daytime highs around 22°C and nights near 14°C. Worth packing: light clothes, rain gear and sun protection. About 8 days see rain.

light clothesrain gearsun protection

Sea temperature near Vannes in August

The nearest coast averages about 18°C in August — 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 August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks 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 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
August 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).