Saint-Nazaire weather in August

In August, Saint-Nazaire sees average daytime highs of 22°C and overnight lows near 16°C, with 45 mm of rain across 7.9 wet days and about 14 hours of daylight. It is the 1st-warmest and 10th-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 34% 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 Saint-Nazaire's 1st-clearest and 12th-windiest month. For the whole year in context, see Saint-Nazaire's year-round climate.

Daytime high
22°
1st warmest
Overnight low
16°
12th coldest
Rainfall
45 mm
7.9 wet days
Daylight
14 h 06 min
6:11 AM – 8:15 PM
Cloud cover
54%
1st clearest
Wind
14 km/h
12th windiest
Solar energy
5.27 kWh/m²
Travel score
7.1
out of 10

Saint-Nazaire is commune in Loire-Atlantique, France.

Air quality
Good
PM2.5 8.2 µg/m³ · 2019
Density
1,433/km²
people per km²

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 Saint-Nazaire reaches about 22°C in the afternoon and slips back to 16°C overnight — a 6°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)
12316
22316
32316
42316
52316
62316
72316
82316
92316
102216
112216
122216
132216
142216
152216
162216
172216
182216
192216
202216
212216
222216
232216
242216
252216
262216
272215
282215
292215
302215
312215

Saint-Nazaire weather by month

How August compares with the rest of the year at a glance. August is the 1st-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan / 7211.58.71.7
Feb / 549.29.92.0
Mar12° / 509.811.63.1
Apr14° / 5110.113.34.1
May17° / 12°5410.214.85.5
Jun20° / 14°418.615.76.5
Jul22° / 16°417.815.37.1
Aug22° / 16°457.9147.1
Sep20° / 14°527.812.46.6
Oct16° / 11°7611.610.64.9
Nov12° / 7611.79.13.1
Dec10° / 8112.38.32.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 34% of the time in August, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 19% of August, with mostly cloudy or overcast conditions the remaining 47%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15446
25446
35545
45446
55545
65545
75545
85446
95446
105446
115347
125347
135347
145347
155248
165248
175248
185149
195149
205149
215149
225248
235248
245248
255347
265347
275347
285347
295347
305545
315545

Chance of precipitation in August

Any precipitation

Saint-Nazaire gets around 45 mm of rain over 7.9 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 25% and peaks near 27% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
125
225
325
426
526
626
726
827
927
1027
1127
1227
1327
1427
1527
1626
1726
1826
1926
2026
2125
2225
2324
2424
2523
2623
2722
2822
2921
3021
3121

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 43% of days. Sticky, muggy-or-worse air turns up on roughly 9% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
19414290
29404190
39404091
4104040101
5104139101
6104138101
7104138101
8104137101
9104237101
10114237101
11114236101
12114336101
1311433691
1411433691
1511443691
1611443591
1711443591
1811453581
1912453580
2012453480
2113453480
2215453370
2316453270
2417453170
2519453060
2621452860
2722452760
2824452650
2925452650
3026442540
3128442440

Wind in August

Winds average 14 km/h in August, the calmest month.

Across August, 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
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1514light breeze
1614light breeze
1714light breeze
1814light breeze
1914light breeze
2014light breeze
2114light breeze
2214light breeze
2314light breeze
2414light breeze
2515light breeze
2615light breeze
2715light breeze
2815light breeze
2915light breeze
3015light breeze
3115light 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 5:51 AM to 6:31 AM, and sunset from 8:38 PM to 7:46 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.85:518:38
214.75:538:37
314.75:548:36
414.75:558:34
514.65:568:33
614.65:588:31
714.55:598:30
814.56:008:28
914.46:028:27
1014.46:038:25
1114.36:048:23
1214.36:068:22
1314.26:078:20
1414.26:088:18
1514.16:108:17
1614.16:118:15
1714.06:128:13
1814.06:148:11
1913.96:158:10
2013.96:168:08
2113.86:188:06
2213.76:198:04
2313.76:208:02
2413.66:228:00
2513.66:237:58
2613.56:257:56
2713.56:267:54
2813.46:277:52
2913.46:297:50
3013.36:307:48
3113.36:317:46

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.27 kWh/m².

For context, solar energy here swings from a low near 0.99 kWh/m² to a high of 6.18 kWh/m² in June across the year — August's 5.27 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.7Bright
25.7Bright
35.7Bright
45.7Bright
55.6Bright
65.6Bright
75.6Bright
85.5Bright
95.5Bright
105.5Bright
115.5Bright
125.4Bright
135.4Bright
145.3Bright
155.3Bright
165.3Bright
175.2Bright
185.2Bright
195.2Bright
205.1Bright
215.1Bright
225.0Bright
235.0Bright
245.0Bright
254.9Bright
264.9Bright
274.9Bright
284.8Bright
294.8Bright
304.8Bright
314.7Bright
Planning a trip in August

Is August a good time to visit Saint-Nazaire?

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

7.1
Sightseeing
1st-best month of the year
5.0
Beach & pool
1st-best month of the year

August is one of the better times to visit Saint-Nazaire for general sightseeing.

What to pack for Saint-Nazaire in August

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

In August, Saint-Nazaire sees daytime highs around 22°C and nights near 16°C. Worth packing: light clothes and sun protection. About 8 days see rain.

light clothessun protection

Sea temperature near Saint-Nazaire in August

The nearest coast averages about 19°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 18 km away) is warmest in August at about 19°C and coldest in February near 9°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
Feb9Bracing
Mar10Bracing
Apr12Bracing
May14Bracing
Jun17Cool
Jul18Cool
Aug19Cool
Sep17Cool
Oct16Cool
Nov14Bracing
Dec11Bracing

UV index in Saint-Nazaire 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 Saint-Nazaire 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
Nov2Low
Dec1Low
Location & terrain

Where is Saint-Nazaire?

Saint-Nazaire sits at 47.3°N, 2.2°W, 12 m above sea level, in France. The nearest listed city is La Baule-Escoublac, 11 km away.

Topography around Saint-Nazaire

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

Within 3 km, the terrain around Saint-Nazaire has only modest variations in elevation — a maximum elevation change of 37 m around an average of 7 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 119 m; within 80 km, significant variations in elevation — a maximum elevation change of 293 m.

The land around Saint-Nazaire is covered by artificial surfaces (36%) and water (36%) within 3 km, water (32%) and grassland (27%) within 16 km, and water (34%), grassland (25%) and cropland (21%) within 80 km.

3 km
37 m
16 km
119 m
80 km
293 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
August weather nearby: La Baule-Escoublac 11 km · Guérande 17 km · Couëron 38 km · Saint-Herblain 43 km · Orvault 45 km · Bouguenais 46 km · Rezé 50 km · La Chapelle-sur-Erdre 50 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 Saint-Nazaire (47.2751°, -2.2179°, elevation 12 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).