Saint-Sébastien-sur-Loire weather in May

In May, Saint-Sébastien-sur-Loire sees average daytime highs of 19°C and overnight lows near 10°C, with 61 mm of rain across 10.6 wet days and about 14.8 hours of daylight. It is the 5th-warmest and 5th-wettest month of the year here.

Highs climb over the month, from about 17°C in the first days to 20°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 24 min by month's end. Set against the rest of the year, May is Saint-Sébastien-sur-Loire's 6th-clearest and 8th-windiest month. For the whole year in context, see Saint-Sébastien-sur-Loire's year-round climate.

Daytime high
19°
5th warmest
Overnight low
10°
8th coldest
Rainfall
61 mm
10.6 wet days
Daylight
14 h 54 min
5:36 AM – 8:28 PM
Cloud cover
67%
6th clearest
Wind
14 km/h
8th windiest
Solar energy
5.46 kWh/m²
Travel score
5.8
out of 10

Saint-Sébastien-sur-Loire is commune in Loire-Atlantique, France.

Density
2,508/km²
people per km²

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 17°C in the first days to 20°C by the end.

A typical May day in Saint-Sébastien-sur-Loire reaches about 19°C in the afternoon and slips back to 10°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 14°C and 24°C. Set against its neighbours, May runs about 3°C warmer than April and about 3°C cooler than June.

10°20°30°151015202531
Avg high (°C)Avg low (°C)
1178
2178
3179
4179
5179
6179
7189
8189
9189
10189
11189
12189
13189
141810
151910
161910
171910
181910
191910
201910
211910
222010
232011
242011
252011
262011
272011
282011
292011
302111
312111

How May really feels in Saint-Sébastien-sur-Loire

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.

Saint-Sébastien-sur-Loire 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 daysSnow daysDaylight (hours)Travel score
Jan / 7111.20.28.71.6
Feb10° / 559.60.5102.1
Mar13° / 5310.30.111.63.4
Apr15° / 5710.5013.34.6
May19° / 10°6110.6014.85.8
Jun22° / 13°468.4015.66.7
Jul24° / 14°397.3015.37.4
Aug24° / 14°477.30147.4
Sep21° / 12°497.4012.46.9
Oct17° / 10°7311.4010.65.1
Nov12° / 7011.309.13.1
Dec / 7911.40.28.41.9

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 16% of May, with mostly cloudy or overcast conditions the remaining 67%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12872
22773
32773
42773
52773
62872
72872
82971
92971
103070
113169
123169
133268
143367
153367
163367
173466
183664
193664
203763
213763
223763
233763
243763
253862
263862
273862
283961
293862
303862
313961

Chance of precipitation in May

Any precipitation

Saint-Sébastien-sur-Loire gets around 61 mm of rain over 10.6 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 35% and peaks near 40% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
140
240
340
439
539
638
737
837
936
1036
1135
1235
1335
1434
1534
1633
1733
1833
1932
2032
2132
2232
2332
2432
2532
2632
2732
2832
2932
3032
3133

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 85% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
19460
29370
39280
49190
59190
690100
789101
888111
988111
1088111
1187121
1287121
1387121
1487121
1587121
1687121
1787121
1886122
1985132
2085132
2184142
2283152
2381163
2480173
2579183
2678193
2776204
2875214
2974224
3072235
3171245

Wind in May

Winds average 14 km/h in May.

Across May, 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
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
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 May

DaylightNight

Daylight runs from about 14 h 12 min at the start of May to 15 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 72 minutes over May. Sunrise moves from 5:58 AM to 5:22 AM, and sunset from 8:08 PM to 8:45 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.25:588:08
214.25:578:09
314.35:558:11
414.35:538:12
514.45:528:14
614.45:508:15
714.55:498:16
814.55:478:18
914.65:468:19
1014.65:448:20
1114.65:438:22
1214.75:428:23
1314.75:408:24
1414.85:398:26
1514.85:388:27
1614.95:368:28
1714.95:358:29
1814.95:348:31
1915.05:338:32
2015.05:328:33
2115.15:318:34
2215.15:298:36
2315.15:288:37
2415.25:278:38
2515.25:268:39
2615.25:268:40
2715.35:258:41
2815.35:248:42
2915.35:238:43
3015.45:228:44
3115.45:228:45

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.46 kWh/m².

For context, solar energy here swings from a low near 0.97 kWh/m² to a high of 5.89 kWh/m² in June across the year — May's 5.46 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
35.0Bright
45.0Bright
55.1Bright
65.1Bright
75.1Bright
85.2Bright
95.2Bright
105.2Bright
115.3Bright
125.3Bright
135.3Bright
145.4Bright
155.4Bright
165.5Bright
175.5Bright
185.5Bright
195.6Bright
205.6Bright
215.6Bright
225.7Bright
235.7Bright
245.7Bright
255.7Bright
265.8Bright
275.8Bright
285.8Bright
295.8Bright
305.8Bright
315.8Bright
Planning a trip in May

Is May a good time to visit Saint-Sébastien-sur-Loire?

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

5.8
Sightseeing
5th-best month of the year
2.4
Beach & pool
5th-best month of the year

May is a reasonable time to visit Saint-Sébastien-sur-Loire for sightseeing.

What to pack for Saint-Sébastien-sur-Loire in May

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

In May, Saint-Sébastien-sur-Loire sees daytime highs around 19°C and nights near 10°C. Worth packing: rain gear and sun protection. About 11 days see rain.

rain gearsun protection

Sea temperature near Saint-Sébastien-sur-Loire 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 48 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-Sébastien-sur-Loire 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 Saint-Sébastien-sur-Loire 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-Sébastien-sur-Loire?

Saint-Sébastien-sur-Loire sits at 47.2°N, 1.5°W, 17 m above sea level, in France. The nearest listed city is Nantes, 4.0 km away.

Topography around Saint-Sébastien-sur-Loire

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

Within 3 km, the terrain around Saint-Sébastien-sur-Loire has only modest variations in elevation — a maximum elevation change of 42 m around an average of 15 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 166 m; within 80 km, significant variations in elevation — a maximum elevation change of 340 m.

The land around Saint-Sébastien-sur-Loire is covered by artificial surfaces (51%) and trees (27%) within 3 km, grassland (32%), trees (31%) and artificial surfaces (20%) within 16 km, and cropland (35%) and grassland (33%) within 80 km.

3 km
42 m
16 km
166 m
80 km
340 m
treesgrasslandcroplandartificial surfaceswaterwetland
May weather nearby: Nantes 4.0 km · Vertou 5.0 km · Rezé 5.0 km · Bouguenais 10 km · Carquefou 10 km · La Chapelle-sur-Erdre 11 km · Saint-Herblain 11 km · Orvault 12 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-Sébastien-sur-Loire (47.2077°, -1.5033°, elevation 17 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).