Saint-Herblain weather in August

In August, Saint-Herblain sees average daytime highs of 24°C and overnight lows near 15°C, with 46 mm of rain across 7.4 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 24°C through the month. The sky is clear or mostly clear about 31% 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 12 min by month's end. Set against the rest of the year, August is Saint-Herblain's 1st-clearest and 12th-windiest month. For the whole year in context, see Saint-Herblain's year-round climate.

Daytime high
24°
1st warmest
Overnight low
15°
11th coldest
Rainfall
46 mm
7.4 wet days
Daylight
14 h 06 min
6:09 AM – 8:13 PM
Cloud cover
56%
1st clearest
Wind
13 km/h
12th windiest
Solar energy
5.11 kWh/m²
Travel score
7.4
out of 10

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 24°C through the month.

A typical August day in Saint-Herblain reaches about 24°C in the afternoon and slips back to 15°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 29°C. Set against its neighbours, August runs on par with July and about 3°C warmer than September.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12415
22415
32415
42415
52415
62415
72415
82415
92415
102415
112415
122415
132415
142415
152415
162415
172415
182415
192415
202415
212415
222415
232415
242414
252314
262314
272314
282314
292314
302314
312314

How August really feels in Saint-Herblain

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.

Saint-Herblain 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 / 7011.58.71.7
Feb10° / 549.4102.1
Mar13° / 521011.63.4
Apr15° / 5510.313.34.6
May19° / 10°5810.414.85.8
Jun22° / 13°448.215.66.7
Jul24° / 15°407.115.37.4
Aug24° / 15°467.4147.4
Sep21° / 12°487.212.46.9
Oct17° / 10°7211.310.65.1
Nov12° / 7011.49.13.2
Dec10° / 7811.78.41.9

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% 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 50%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15050
25050
35050
45050
55050
65149
75149
85149
95149
105149
115149
125149
135050
144951
155050
164951
174951
185050
194951
204852
214951
224951
234951
244951
255050
265149
275149
285149
295347
305347
315347

Chance of precipitation in August

Any precipitation

Saint-Herblain gets around 46 mm of rain over 7.4 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 23% and peaks near 26% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
122
222
323
423
524
624
724
825
925
1025
1126
1226
1326
1425
1525
1625
1725
1824
1924
2024
2124
2223
2323
2422
2522
2621
2721
2820
2920
3020
3119

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 42% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
12043334
22043335
32042325
42142325
52142315
62242315
72242316
82242306
92342306
102342296
112342295
122442285
132442285
142442285
152543275
162543275
172543275
182643275
192643275
202743265
212742264
222942254
233042244
243141234
253341234
263440224
273640213
283739203
293939203
304039193
314138182

Wind in August

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

Across August, daily wind ranges from about 12 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
112light breeze
212light breeze
312light breeze
412light breeze
512light breeze
612light breeze
712light breeze
812light breeze
912light breeze
1012light breeze
1112light breeze
1212light breeze
1312light breeze
1412light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze
3113light breeze

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 h 48 min at the start of August to 13 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 96 minutes over August. Sunrise moves from 5:49 AM to 6:29 AM, and sunset from 8:36 PM to 7:44 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.85:498:36
214.75:518:35
314.75:528:33
414.65:538:32
514.65:548:30
614.65:568:29
714.55:578:27
814.55:588:26
914.46:008:24
1014.46:018:23
1114.36:028:21
1214.36:048:19
1314.26:058:18
1414.26:068:16
1514.16:088:14
1614.16:098:13
1714.06:108:11
1814.06:128:09
1913.96:138:07
2013.96:148:05
2113.86:168:04
2213.76:178:02
2313.76:188:00
2413.66:207:58
2513.66:217:56
2613.56:227:54
2713.56:247:52
2813.46:257:50
2913.46:267:48
3013.36:287:46
3113.26:297:44

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.11 kWh/m².

For context, solar energy here swings from a low near 0.98 kWh/m² to a high of 5.94 kWh/m² in June across the year — August's 5.11 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.5Bright
45.5Bright
55.5Bright
65.4Bright
75.4Bright
85.4Bright
95.3Bright
105.3Bright
115.3Bright
125.3Bright
135.2Bright
145.2Bright
155.1Bright
165.1Bright
175.1Bright
185.0Bright
195.0Bright
205.0Bright
214.9Bright
224.9Bright
234.9Bright
244.8Bright
254.8Bright
264.8Bright
274.7Bright
284.7Bright
294.7Bright
304.6Bright
314.6Bright
Planning a trip in August

Is August a good time to visit Saint-Herblain?

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

7.4
Sightseeing
1st-best month of the year
6.2
Beach & pool
1st-best month of the year

August is one of the better times to visit Saint-Herblain for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Saint-Herblain in August

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

In August, Saint-Herblain sees daytime highs around 24°C and nights near 15°C. Worth packing: light clothes and sun protection. About 7 days see rain.

light clothessun protection

Sea temperature near Saint-Herblain 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 37 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-Herblain 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-Herblain 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-Herblain?

Saint-Herblain sits at 47.2°N, 1.7°W, 23 m above sea level, in France. The nearest listed city is Bouguenais, 4.0 km away.

Topography around Saint-Herblain

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

Within 3 km, the terrain around Saint-Herblain has only modest variations in elevation — a maximum elevation change of 68 m around an average of 26 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 165 m; within 80 km, significant variations in elevation — a maximum elevation change of 340 m.

The land around Saint-Herblain is covered by artificial surfaces (36%), trees (35%) and grassland (23%) within 3 km, grassland (35%) and trees (31%) within 16 km, and cropland (32%) and grassland (31%) within 80 km.

3 km
68 m
16 km
165 m
80 km
340 m
treesgrasslandcroplandartificial surfaceswaterwetland
August weather nearby: Bouguenais 4.0 km · Couëron 6.0 km · Rezé 7.0 km · Orvault 7.0 km · Nantes 7.0 km · Saint-Sébastien-sur-Loire 11 km · La Chapelle-sur-Erdre 12 km · Vertou 14 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-Herblain (47.2115°, -1.651°, elevation 23 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).