Saint-Malo weather in September

In September, Saint-Malo sees average daytime highs of 18°C and overnight lows near 16°C, with 76 mm of rain across 10.7 wet days and about 12.4 hours of daylight. It is the 3rd-warmest and 5th-wettest month of the year here.

Day-to-day highs hold fairly steady near 18°C through the month. The sky is clear or mostly clear about 27% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 18 min at the start of September to 11 h 30 min by month's end. Set against the rest of the year, September is Saint-Malo's 3rd-clearest and 8th-windiest month. For the whole year in context, see Saint-Malo's year-round climate.

Daytime high: 18°; 3rd warmest
Overnight low: 16°; 10th coldest
Rainfall: 76 mm; 10.7 wet days
Daylight: 12 h 24 min; 6:52 AM – 7:13 PM
Cloud cover: 58%; 3rd clearest
Wind: 22 km/h; 8th windiest
Solar energy: 3.83 kWh/m²
Travel score: 5.7; out of 10

Air quality: Good; PM10 19.5 µg/m³ · 2019

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

← August Saint-Malo year-round climate October →Best places to visit in September

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 18°C through the month.

A typical September day in Saint-Malo reaches about 18°C in the afternoon and slips back to 16°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 20°C. Set against its neighbours, September runs about 1°C cooler than August and about 2°C warmer than October.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Avg high (°C)	19	19	19	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	17	17	17	17	17	17	17
Avg low (°C)	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15

	Avg high (°C)	Avg low (°C)
1	19	16
2	19	16
3	19	16
4	18	16
5	18	16
6	18	16
7	18	16
8	18	16
9	18	16
10	18	16
11	18	16
12	18	16
13	18	16
14	18	16
15	18	16
16	18	15
17	18	15
18	18	15
19	18	15
20	18	15
21	18	15
22	18	15
23	18	15
24	17	15
25	17	15
26	17	15
27	17	15
28	17	15
29	17	15
30	17	15

Saint-Malo weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 5th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	9° / 7°	91	14.8	8.5	1.6
Feb	9° / 6°	73	13	9.8	1.5
Mar	10° / 7°	66	12.2	11.6	2.1
Apr	11° / 9°	58	10.4	13.4	2.9
May	14° / 11°	57	9.8	15	4.0
Jun	16° / 14°	50	8.8	15.8	5.2
Jul	18° / 16°	48	9.3	15.5	6.2
Aug	19° / 17°	59	10.2	14.2	6.1
Sep	18° / 16°	76	10.7	12.4	5.7
Oct	16° / 13°	107	15.3	10.5	4.2
Nov	12° / 10°	117	16.3	9	2.8
Dec	10° / 8°	119	16.1	8.1	1.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

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

Beyond those clear spells, partly cloudy skies cover about 22% of September, with mostly cloudy or overcast conditions the remaining 51%. Skies tend to cloud over as the month goes on.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Clearer (%)	54	54	54	54	54	54	54	53	53	51	51	50	50	50	49	48	48	48	48	47	47	47	47	45	45	44	44	41	41	39
Cloudier (%)	46	46	46	46	46	46	46	47	47	49	49	50	50	50	51	52	52	52	52	53	53	53	53	55	55	56	56	59	59	61

	Clearer (%)	Cloudier (%)
1	54	46
2	54	46
3	54	46
4	54	46
5	54	46
6	54	46
7	54	46
8	53	47
9	53	47
10	51	49
11	51	49
12	50	50
13	50	50
14	50	50
15	49	51
16	48	52
17	48	52
18	48	52
19	48	52
20	47	53
21	47	53
22	47	53
23	47	53
24	45	55
25	45	55
26	44	56
27	44	56
28	41	59
29	41	59
30	39	61

Chance of precipitation in September

Any precipitation

Saint-Malo gets around 76 mm of rain over 10.7 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 37% and peaks near 47% on the wettest days. The odds climb toward the end of the month.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Rain chance (%)	30	30	30	30	30	31	31	32	32	33	34	34	34	35	35	36	36	37	38	38	39	40	40	41	42	43	44	46	47	47

	Rain chance (%)
1	30
2	30
3	30
4	30
5	30
6	31
7	31
8	32
9	32
10	33
11	34
12	34
13	34
14	35
15	35
16	36
17	36
18	37
19	38
20	38
21	39
22	40
23	40
24	41
25	42
26	43
27	44
28	46
29	47
30	47

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the dry band about 50% of days. It rarely turns muggy — the humid and sticky bands barely register.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Dry (%)	37	38	39	40	41	42	43	44	45	46	47	48	49	50	51	52	53	54	54	54	55	55	55	56	55	57	57	58	59	59
Comfortable (%)	43	42	42	41	40	40	39	38	38	37	37	36	36	36	36	36	36	36	36	37	37	38	38	38	39	38	38	38	37	37
Humid (%)	20	20	19	19	19	18	18	18	17	17	16	16	15	14	13	12	11	10	10	9	8	7	7	6	6	5	5	4	4	4

	Dry (%)	Comfortable (%)	Humid (%)
1	37	43	20
2	38	42	20
3	39	42	19
4	40	41	19
5	41	40	19
6	42	40	18
7	43	39	18
8	44	38	18
9	45	38	17
10	46	37	17
11	47	37	16
12	48	36	16
13	49	36	15
14	50	36	14
15	51	36	13
16	52	36	12
17	53	36	11
18	54	36	10
19	54	36	10
20	54	37	9
21	55	37	8
22	55	38	7
23	55	38	7
24	56	38	6
25	55	39	6
26	57	38	5
27	57	38	5
28	58	38	4
29	59	37	4
30	59	37	4

Wind in September

Winds average 22 km/h in September.

Across September, daily wind ranges from about 21 km/h on the calmest days to 23 km/h at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Wind speed (km/h)	21	21	21	21	21	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	23	23	23	23	23	23	23	23
Feels	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy

	Wind speed (km/h)	Feels
1	21	breezy
2	21	breezy
3	21	breezy
4	21	breezy
5	21	breezy
6	22	breezy
7	22	breezy
8	22	breezy
9	22	breezy
10	22	breezy
11	22	breezy
12	22	breezy
13	22	breezy
14	22	breezy
15	22	breezy
16	22	breezy
17	22	breezy
18	22	breezy
19	22	breezy
20	22	breezy
21	22	breezy
22	22	breezy
23	23	breezy
24	23	breezy
25	23	breezy
26	23	breezy
27	23	breezy
28	23	breezy
29	23	breezy
30	23	breezy

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 18 min at the start of September to 11 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 108 minutes over September. Sunrise moves from 6:30 AM to 7:12 AM, and sunset from 7:45 PM to 6:42 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Daylight (h)	13.3	13.2	13.1	13.1	13.0	13.0	12.9	12.8	12.8	12.7	12.7	12.6	12.5	12.5	12.4	12.4	12.3	12.2	12.2	12.1	12.0	12.0	11.9	11.9	11.8	11.7	11.7	11.6	11.6	11.5
Sunrise (AM)	6:30	6:32	6:33	6:34	6:36	6:37	6:39	6:40	6:42	6:43	6:45	6:46	6:47	6:49	6:50	6:52	6:53	6:55	6:56	6:58	6:59	7:01	7:02	7:04	7:05	7:06	7:08	7:09	7:11	7:12
Sunset (PM)	7:45	7:43	7:41	7:39	7:37	7:35	7:33	7:30	7:28	7:26	7:24	7:22	7:19	7:17	7:15	7:13	7:11	7:08	7:06	7:04	7:02	7:00	6:57	6:55	6:53	6:51	6:49	6:47	6:44	6:42

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	13.3	6:30	7:45
2	13.2	6:32	7:43
3	13.1	6:33	7:41
4	13.1	6:34	7:39
5	13.0	6:36	7:37
6	13.0	6:37	7:35
7	12.9	6:39	7:33
8	12.8	6:40	7:30
9	12.8	6:42	7:28
10	12.7	6:43	7:26
11	12.7	6:45	7:24
12	12.6	6:46	7:22
13	12.5	6:47	7:19
14	12.5	6:49	7:17
15	12.4	6:50	7:15
16	12.4	6:52	7:13
17	12.3	6:53	7:11
18	12.2	6:55	7:08
19	12.2	6:56	7:06
20	12.1	6:58	7:04
21	12.0	6:59	7:02
22	12.0	7:01	7:00
23	11.9	7:02	6:57
24	11.9	7:04	6:55
25	11.8	7:05	6:53
26	11.7	7:06	6:51
27	11.7	7:08	6:49
28	11.6	7:09	6:47
29	11.6	7:11	6:44
30	11.5	7:12	6:42

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.83 kWh/m².

For context, solar energy here swings from a low near 0.88 kWh/m² to a high of 6.22 kWh/m² in June across the year — September's 3.83 kWh/m² falls in the middle.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Solar energy (kWh/m²)	4.5	4.5	4.5	4.4	4.4	4.3	4.3	4.2	4.2	4.1	4.1	4.0	4.0	3.9	3.9	3.8	3.7	3.7	3.6	3.6	3.5	3.5	3.4	3.3	3.3	3.2	3.1	3.1	3.0	3.0
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	Solar energy (kWh/m²)	Level
1	4.5	Bright
2	4.5	Bright
3	4.5	Bright
4	4.4	Bright
5	4.4	Bright
6	4.3	Bright
7	4.3	Bright
8	4.2	Bright
9	4.2	Bright
10	4.1	Bright
11	4.1	Bright
12	4.0	Bright
13	4.0	Moderate
14	3.9	Moderate
15	3.9	Moderate
16	3.8	Moderate
17	3.7	Moderate
18	3.7	Moderate
19	3.6	Moderate
20	3.6	Moderate
21	3.5	Moderate
22	3.5	Moderate
23	3.4	Moderate
24	3.3	Moderate
25	3.3	Moderate
26	3.2	Moderate
27	3.1	Moderate
28	3.1	Moderate
29	3.0	Moderate
30	3.0	Moderate

Planning a trip in September

Is September a good time to visit Saint-Malo?

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

5.7

Sightseeing

3rd-best month of the year

1.9

Beach & pool

3rd-best month of the year

September is a reasonable time to visit Saint-Malo for sightseeing.

What to pack for Saint-Malo in September

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

In September, Saint-Malo sees daytime highs around 18°C and nights near 16°C. Worth packing: rain gear and a windbreaker. About 11 days see rain.

rain geara windbreaker

Sea temperature near Saint-Malo in September

The nearest coast averages about 18°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in August at about 18°C and coldest in February near 9°C.

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	9	9	9	10	12	15	17	18	18	16	13	11
Comfort	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Cool	Cool	Cool	Cool	Bracing	Bracing

	Sea temperature (°C)	Comfort
Jan	9	Bracing
Feb	9	Bracing
Mar	9	Bracing
Apr	10	Bracing
May	12	Bracing
Jun	15	Bracing
Jul	17	Cool
Aug	18	Cool
Sep	18	Cool
Oct	16	Cool
Nov	13	Bracing
Dec	11	Bracing

UV index in Saint-Malo in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 5 — 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-Malo peaks around June 17 at about 7 (high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near January 11 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 6 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	1	2	3	5	6	7	6	7	5	3	1	1
Level	Low	Low	Moderate	Moderate	High	High	High	High	Moderate	Moderate	Low	Low

	UV index (midday)	Level
Jan	1	Low
Feb	2	Low
Mar	3	Moderate
Apr	5	Moderate
May	6	High
Jun	7	High
Jul	6	High
Aug	7	High
Sep	5	Moderate
Oct	3	Moderate
Nov	1	Low
Dec	1	Low

Location & terrain

Where is Saint-Malo?

Saint-Malo sits at 48.6°N, 2.0°W, 10 m above sea level, in France. The nearest listed city is Saint-Brieuc, 58 km away.

Topography around Saint-Malo

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

Within 3 km, the terrain around Saint-Malo has only modest variations in elevation — a maximum elevation change of 52 m around an average of 10 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 144 m; within 80 km, significant variations in elevation — a maximum elevation change of 375 m.

The land around Saint-Malo is covered by water (47%) and artificial surfaces (31%) within 3 km, water (54%) within 16 km, and water (35%) and cropland (27%) within 80 km.

3 km

52 m

water 47%

16 km

144 m

water 54%

80 km

375 m

water 35%

treesgrasslandcroplandartificial surfacesbare terrainwater

← August Saint-Malo year-round climate October →Best places to visit in September

September weather nearby: Saint-Brieuc 58 km · Saint Helier 61 km · Rennes 65 km · Cesson-Sévigné 66 km · Fougères 68 km · Vitré 83 km · Saint-Lô 85 km · Pontivy 96 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

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-Malo (48.6474°, -2.0088°, elevation 10 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).

	Avg high (°C)	Avg low (°C)
1	19	16
2	19	16
3	19	16
4	18	16
5	18	16
6	18	16
7	18	16
8	18	16
9	18	16
10	18	16
11	18	16
12	18	16
13	18	16
14	18	16
15	18	16
16	18	15
17	18	15
18	18	15
19	18	15
20	18	15
21	18	15
22	18	15
23	18	15
24	17	15
25	17	15
26	17	15
27	17	15
28	17	15
29	17	15
30	17	15

	Clearer (%)	Cloudier (%)
1	54	46
2	54	46
3	54	46
4	54	46
5	54	46
6	54	46
7	54	46
8	53	47
9	53	47
10	51	49
11	51	49
12	50	50
13	50	50
14	50	50
15	49	51
16	48	52
17	48	52
18	48	52
19	48	52
20	47	53
21	47	53
22	47	53
23	47	53
24	45	55
25	45	55
26	44	56
27	44	56
28	41	59
29	41	59
30	39	61

	Rain chance (%)
1	30
2	30
3	30
4	30
5	30
6	31
7	31
8	32
9	32
10	33
11	34
12	34
13	34
14	35
15	35
16	36
17	36
18	37
19	38
20	38
21	39
22	40
23	40
24	41
25	42
26	43
27	44
28	46
29	47
30	47

	Dry (%)	Comfortable (%)	Humid (%)
1	37	43	20
2	38	42	20
3	39	42	19
4	40	41	19
5	41	40	19
6	42	40	18
7	43	39	18
8	44	38	18
9	45	38	17
10	46	37	17
11	47	37	16
12	48	36	16
13	49	36	15
14	50	36	14
15	51	36	13
16	52	36	12
17	53	36	11
18	54	36	10
19	54	36	10
20	54	37	9
21	55	37	8
22	55	38	7
23	55	38	7
24	56	38	6
25	55	39	6
26	57	38	5
27	57	38	5
28	58	38	4
29	59	37	4
30	59	37	4

	Avg high (°C)	Avg low (°C)
1	19	16
2	19	16
3	19	16
4	18	16
5	18	16
6	18	16
7	18	16
8	18	16
9	18	16
10	18	16
11	18	16
12	18	16
13	18	16
14	18	16
15	18	16
16	18	15
17	18	15
18	18	15
19	18	15
20	18	15
21	18	15
22	18	15
23	18	15
24	17	15
25	17	15
26	17	15
27	17	15
28	17	15
29	17	15
30	17	15

	Clearer (%)	Cloudier (%)
1	54	46
2	54	46
3	54	46
4	54	46
5	54	46
6	54	46
7	54	46
8	53	47
9	53	47
10	51	49
11	51	49
12	50	50
13	50	50
14	50	50
15	49	51
16	48	52
17	48	52
18	48	52
19	48	52
20	47	53
21	47	53
22	47	53
23	47	53
24	45	55
25	45	55
26	44	56
27	44	56
28	41	59
29	41	59
30	39	61

	Rain chance (%)
1	30
2	30
3	30
4	30
5	30
6	31
7	31
8	32
9	32
10	33
11	34
12	34
13	34
14	35
15	35
16	36
17	36
18	37
19	38
20	38
21	39
22	40
23	40
24	41
25	42
26	43
27	44
28	46
29	47
30	47

	Dry (%)	Comfortable (%)	Humid (%)
1	37	43	20
2	38	42	20
3	39	42	19
4	40	41	19
5	41	40	19
6	42	40	18
7	43	39	18
8	44	38	18
9	45	38	17
10	46	37	17
11	47	37	16
12	48	36	16
13	49	36	15
14	50	36	14
15	51	36	13
16	52	36	12
17	53	36	11
18	54	36	10
19	54	36	10
20	54	37	9
21	55	37	8
22	55	38	7
23	55	38	7
24	56	38	6
25	55	39	6
26	57	38	5
27	57	38	5
28	58	38	4
29	59	37	4
30	59	37	4

	Avg high (°C)	Avg low (°C)
1	19	16
2	19	16
3	19	16
4	18	16
5	18	16
6	18	16
7	18	16
8	18	16
9	18	16
10	18	16
11	18	16
12	18	16
13	18	16
14	18	16
15	18	16
16	18	15
17	18	15
18	18	15
19	18	15
20	18	15
21	18	15
22	18	15
23	18	15
24	17	15
25	17	15
26	17	15
27	17	15
28	17	15
29	17	15
30	17	15

	Clearer (%)	Cloudier (%)
1	54	46
2	54	46
3	54	46
4	54	46
5	54	46
6	54	46
7	54	46
8	53	47
9	53	47
10	51	49
11	51	49
12	50	50
13	50	50
14	50	50
15	49	51
16	48	52
17	48	52
18	48	52
19	48	52
20	47	53
21	47	53
22	47	53
23	47	53
24	45	55
25	45	55
26	44	56
27	44	56
28	41	59
29	41	59
30	39	61

	Rain chance (%)
1	30
2	30
3	30
4	30
5	30
6	31
7	31
8	32
9	32
10	33
11	34
12	34
13	34
14	35
15	35
16	36
17	36
18	37
19	38
20	38
21	39
22	40
23	40
24	41
25	42
26	43
27	44
28	46
29	47
30	47

	Dry (%)	Comfortable (%)	Humid (%)
1	37	43	20
2	38	42	20
3	39	42	19
4	40	41	19
5	41	40	19
6	42	40	18
7	43	39	18
8	44	38	18
9	45	38	17
10	46	37	17
11	47	37	16
12	48	36	16
13	49	36	15
14	50	36	14
15	51	36	13
16	52	36	12
17	53	36	11
18	54	36	10
19	54	36	10
20	54	37	9
21	55	37	8
22	55	38	7
23	55	38	7
24	56	38	6
25	55	39	6
26	57	38	5
27	57	38	5
28	58	38	4
29	59	37	4
30	59	37	4