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September

Vannes Weather in September with Sea Temperature

September weather in Vannes includes average daytime air +21°C, nighttime +14°C, average sea temperature +19°C. Daily water temperatures usually range from +18°C to +20°C, which is cool for long swims. The tables below also show air temperature, wind, rain and humidity; for near-term water data, open the current 30-day water temperature forecast.

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Averaged values across several years

Daily air temperature for the month

Day Night

Daily sea water temperature for the month

Water

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September	Day	Night	Sea t°	Wind	Precip	Humidity
1Mon	+21°C	+15°C	+20°C	5 m/s	0.8 mm	78%
2Tue	+23°C	+14°C	+20°C	5 m/s	0.3 mm	76%
3Wed	+22°C	+16°C	+20°C	5 m/s	0.4 mm	77%
4Thu	+23°C	+16°C	+20°C	5 m/s	0.1 mm	72%
5Fri	+22°C	+15°C	+19°C	3 m/s	0.1 mm	71%
6Sat	+24°C	+15°C	+19°C	4 m/s	0.2 mm	70%
7Sun	+22°C	+16°C	+20°C	4 m/s	0.4 mm	74%
8Mon	+22°C	+16°C	+20°C	5 m/s	1.6 mm	75%
9Tue	+22°C	+15°C	+20°C	5 m/s	0.1 mm	75%
10Wed	+21°C	+15°C	+20°C	5 m/s	0.4 mm	82%
11Thu	+21°C	+14°C	+19°C	4 m/s	0.1 mm	75%
12Fri	+22°C	+14°C	+19°C	4 m/s	0.2 mm	71%
13Sat	+23°C	+15°C	+19°C	4 m/s	0.2 mm	71%
14Sun	+23°C	+15°C	+19°C	4 m/s	0.3 mm	74%
15Mon	+22°C	+14°C	+18°C	4 m/s	0 mm	71%
16Tue	+23°C	+14°C	+18°C	4 m/s	0.1 mm	73%
17Wed	+22°C	+15°C	+19°C	5 m/s	0.2 mm	74%
18Thu	+23°C	+14°C	+18°C	5 m/s	0.3 mm	70%
19Fri	+22°C	+14°C	+19°C	5 m/s	0.1 mm	73%
20Sat	+21°C	+14°C	+19°C	5 m/s	0.7 mm	75%
21Sun	+20°C	+14°C	+19°C	4 m/s	0.7 mm	78%
22Mon	+20°C	+13°C	+19°C	5 m/s	0.3 mm	72%
23Tue	+19°C	+12°C	+18°C	4 m/s	0.7 mm	69%
24Wed	+19°C	+12°C	+18°C	5 m/s	0.3 mm	75%
25Thu	+19°C	+13°C	+18°C	5 m/s	0.6 mm	73%
26Fri	+18°C	+12°C	+19°C	5 m/s	0.3 mm	77%
27Sat	+18°C	+12°C	+19°C	6 m/s	0.5 mm	73%
28Sun	+18°C	+12°C	+19°C	5 m/s	0.1 mm	74%
29Mon	+18°C	+12°C	+18°C	5 m/s	0.1 mm	75%
30Tue	+19°C	+12°C	+18°C	6 m/s	0.5 mm	75%

Sea water temperature by months

Water +19°C

Day and night air temperature

Day +21°C Night +14°C

Weather highs and lows in Vannes for september

Warmest day: 6 september, +24°C
Coldest night: 28 september, +12°C
Max precipitation: 8 september, 1.6 mm
Warmest sea water: 1 september, +20°C
Coldest sea water: 15 september, +18°C

Climate in Vannes in september

Average daytime temperature: +21°C
Average nighttime temperature: +14°C
Sea water temperature: —
Precipitation (monthly average): 10.5 mm
Days with precipitation: 3.5
Humidity: 74%
Wind: 5 m/s
Data: 6 years / coverage 100%

Daily air temperature for the month

Day Night

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September	Day	Night	Sea t°	Wind	Precip	Humidity
1Mon	+19°C	+15°C	—	6-8 m/s, W	0.9 mm	79%
2Tue	+20°C	+15°C	—	8-11 m/s, WSW	0.5 mm	83%
3Wed	+20°C	+16°C	—	11-15 m/s, SW	1.9 mm	89%
4Thu	+19°C	+15°C	—	8-9 m/s, W	0.2 mm	76%
5Fri	+19°C	+13°C	—	3-5 m/s, SSW	0 mm	77%
6Sat	+25°C	+14°C	—	6-7 m/s, ESE	0 mm	63%
7Sun	+20°C	+15°C	—	5-9 m/s, SSW	0 mm	85%
8Mon	+19°C	+14°C	—	5-6 m/s, WSW	0.1 mm	72%
9Tue	+19°C	+14°C	—	5-8 m/s, SSW	0.1 mm	74%
10Wed	+18°C	+15°C	—	7-9 m/s, SSW	1.9 mm	87%
11Thu	+19°C	+14°C	—	8-10 m/s, WSW	0.4 mm	78%
12Fri	+19°C	+13°C	—	7-8 m/s, WSW	1 mm	73%
13Sat	+19°C	+14°C	—	8-9 m/s, W	1 mm	78%
14Sun	+20°C	+15°C	—	7-10 m/s, WSW	0.2 mm	92%
15Mon	+18°C	+14°C	—	10-11 m/s, W	0 mm	74%
16Tue	+19°C	+14°C	—	6 m/s, WSW	0 mm	76%
17Wed	+20°C	+15°C	—	5-6 m/s, SW	0 mm	77%
18Thu	+22°C	+15°C	—	2-3 m/s, SSW	0 mm	78%
19Fri	+23°C	+15°C	—	3-5 m/s, S	0.1 mm	69%
20Sat	+21°C	+13°C	—	6-9 m/s, SSW	0 mm	78%
21Sun	+17°C	+12°C	—	4 m/s, WSW	1 mm	74%
22Mon	+18°C	+11°C	—	8-10 m/s, NE	0.7 mm	74%
23Tue	+17°C	+9°C	—	6-7 m/s, NNE	0 mm	63%
24Wed	+19°C	+11°C	—	6 m/s, NE	0 mm	70%
25Thu	+19°C	+10°C	—	5-6 m/s, NE	0 mm	62%
26Fri	+16°C	+8°C	—	3-5 m/s, NE	0 mm	66%
27Sat	+17°C	+12°C	—	2-3 m/s, SSE	0 mm	70%
28Sun	+20°C	+12°C	—	2 m/s, ENE	0 mm	67%
29Mon	+20°C	+11°C	—	4-5 m/s, NNE	0 mm	72%
30Tue	+21°C	+11°C	—	4-5 m/s, ENE	0 mm	68%

Weather highs and lows in Vannes for september

Warmest day: 6 september, +25°C
Coldest night: 26 september, +8°C
Max precipitation: 3 september, 1.9 mm
Warmest water: —
Coldest water: —

Climate in Vannes in september

Year: 2025
Average daytime temperature: +19°C
Average nighttime temperature: +13°C
Water temperature: —
Precipitation (month): 10 mm
Days with precipitation: 5
Humidity: 75%
Wind: 6 m/s

Daily air temperature for the month

Day Night

Daily sea water temperature for the month

Water

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September	Day	Night	Sea t°	Wind	Precip	Humidity
1Sun	+20°C	+18°C	+20°C	3-4 m/s, SW	3.1 mm	92%
2Mon	+21°C	+14°C	+20°C	5-6 m/s, W	1.3 mm	81%
3Tue	+20°C	+14°C	+20°C	4-5 m/s, NW	0.3 mm	82%
4Wed	+19°C	+13°C	+20°C	3-4 m/s, W	0.1 mm	74%
5Thu	+17°C	+13°C	+19°C	3-5 m/s, NW	0.2 mm	67%
6Fri	+17°C	+12°C	+19°C	3-4 m/s, SE	1 mm	74%
7Sat	+16°C	+13°C	+20°C	3-4 m/s, WNW	1.8 mm	88%
8Sun	+18°C	+15°C	+20°C	7-10 m/s, WSW	1.9 mm	92%
9Mon	+20°C	+11°C	+20°C	6 m/s, WNW	0 mm	76%
10Tue	+19°C	+11°C	+20°C	6-8 m/s, W	0.1 mm	82%
11Wed	+16°C	+11°C	+19°C	6-8 m/s, WNW	0 mm	78%
12Thu	+17°C	+10°C	+19°C	5-6 m/s, NW	0 mm	62%
13Fri	+18°C	+9°C	+19°C	4 m/s, ENE	0 mm	64%
14Sat	+18°C	+9°C	+19°C	3-4 m/s, E	0 mm	63%
15Sun	+19°C	+10°C	+18°C	3-4 m/s, E	0 mm	58%
16Mon	+21°C	+11°C	+18°C	4-6 m/s, NE	0 mm	67%
17Tue	+22°C	+13°C	+19°C	6-7 m/s, NE	0 mm	75%
18Wed	+23°C	+14°C	+18°C	6-7 m/s, ENE	0 mm	74%
19Thu	+22°C	+15°C	+19°C	6 m/s, ENE	0 mm	65%
20Fri	+22°C	+14°C	+19°C	4-5 m/s, NE	0 mm	66%
21Sat	+18°C	+14°C	+19°C	4-5 m/s, SE	0.1 mm	87%
22Sun	+19°C	+15°C	+19°C	3-6 m/s, WSW	0.1 mm	85%
23Mon	+17°C	+13°C	+18°C	5-9 m/s, WSW	0.8 mm	88%
24Tue	+18°C	+14°C	+18°C	5-6 m/s, WSW	0.1 mm	81%
25Wed	+16°C	+14°C	+18°C	5-7 m/s, SSW	2.6 mm	90%
26Thu	+17°C	+13°C	+19°C	9-11 m/s, WSW	0.2 mm	84%
27Fri	+15°C	+10°C	+19°C	8-10 m/s, NNW	0.1 mm	76%
28Sat	+16°C	+9°C	+19°C	4-6 m/s, NNW	0 mm	66%
29Sun	+16°C	+11°C	+18°C	7-12 m/s, SSE	0.1 mm	79%
30Mon	+17°C	+13°C	+18°C	11-12 m/s, W	0.5 mm	81%

Weather highs and lows in Vannes for september

Warmest day: 18 september, +23°C
Coldest night: 13 september, +9°C
Max precipitation: 1 september, 3.1 mm
Warmest water: 1 september, +20°C
Coldest water: 15 september, +18°C

Climate in Vannes in september

Year: 2024
Average daytime temperature: +19°C
Average nighttime temperature: +13°C
Water temperature: —
Precipitation (month): 14.4 mm
Days with precipitation: 6
Humidity: 77%
Wind: 5 m/s

Daily air temperature for the month

Day Night

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September	Day	Night	Sea t°	Wind	Precip	Humidity
1Fri	+21°C	+15°C	—	6-7 m/s, WSW	0.9 mm	84%
2Sat	+24°C	+14°C	—	2-3 m/s, E	0 mm	76%
3Sun	+28°C	+17°C	—	5-8 m/s, E	0 mm	65%
4Mon	+30°C	+20°C	—	7-8 m/s, E	0 mm	52%
5Tue	+27°C	+19°C	—	3 m/s, SSW	0 mm	60%
6Wed	+28°C	+19°C	—	2-3 m/s, E	0 mm	64%
7Thu	+27°C	+20°C	—	2-3 m/s, SSW	0 mm	59%
8Fri	+28°C	+20°C	—	2 m/s, WNW	0 mm	58%
9Sat	+26°C	+19°C	—	3-4 m/s, SSW	0 mm	63%
10Sun	+24°C	+18°C	—	3-4 m/s, SSW	0 mm	74%
11Mon	+25°C	+17°C	—	3-6 m/s, W	0 mm	73%
12Tue	+23°C	+16°C	—	3-4 m/s, NW	0.1 mm	80%
13Wed	+22°C	+17°C	—	3 m/s, NE	0 mm	80%
14Thu	+23°C	+13°C	—	3-4 m/s, ENE	0 mm	74%
15Fri	+24°C	+15°C	—	3-4 m/s, SSE	0 mm	67%
16Sat	+24°C	+17°C	—	3 m/s, ENE	0.8 mm	80%
17Sun	+22°C	+18°C	—	5-7 m/s, SSE	0.7 mm	82%
18Mon	+21°C	+15°C	—	6-8 m/s, WSW	0.7 mm	74%
19Tue	+20°C	+15°C	—	6-9 m/s, WSW	0.1 mm	72%
20Wed	+21°C	+16°C	—	10-12 m/s, SW	3.8 mm	81%
21Thu	+17°C	+14°C	—	5-7 m/s, WSW	2.9 mm	79%
22Fri	+18°C	+11°C	—	6 m/s, WNW	0.6 mm	74%
23Sat	+17°C	+10°C	—	3-4 m/s, SW	0 mm	72%
24Sun	+19°C	+15°C	—	6-9 m/s, SSE	0 mm	75%
25Mon	+21°C	+17°C	—	3-6 m/s, WSW	0.1 mm	77%
26Tue	+21°C	+17°C	—	3-5 m/s, SW	0 mm	80%
27Wed	+21°C	+15°C	—	6-8 m/s, S	0.4 mm	85%
28Thu	+20°C	+14°C	—	5-7 m/s, S	0.4 mm	82%
29Fri	+20°C	+14°C	—	6-10 m/s, NW	0.1 mm	74%
30Sat	+20°C	+12°C	—	3-4 m/s, S	0 mm	74%

Weather highs and lows in Vannes for september

Warmest day: 4 september, +30°C
Coldest night: 23 september, +10°C
Max precipitation: 20 september, 3.8 mm
Warmest water: —
Coldest water: —

Climate in Vannes in september

Year: 2023
Average daytime temperature: +23°C
Average nighttime temperature: +16°C
Water temperature: —
Precipitation (month): 11.6 mm
Days with precipitation: 2
Humidity: 73%
Wind: 4 m/s

Daily air temperature for the month

Day Night

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September	Day	Night	Sea t°	Wind	Precip	Humidity
1Thu	+23°C	+17°C	—	3-4 m/s, E	0.1 mm	76%
2Fri	+22°C	+16°C	—	3-4 m/s, SW	0 mm	82%
3Sat	+20°C	+15°C	—	4-6 m/s, SW	0.1 mm	82%
4Sun	+22°C	+18°C	—	6-7 m/s, S	0.2 mm	76%
5Mon	+25°C	+17°C	—	4-6 m/s, SSW	0.2 mm	79%
6Tue	+21°C	+16°C	—	6-8 m/s, SSW	0.4 mm	83%
7Wed	+21°C	+17°C	—	6-7 m/s, SW	0.8 mm	84%
8Thu	+21°C	+16°C	—	7-8 m/s, WSW	3.9 mm	78%
9Fri	+21°C	+15°C	—	7-8 m/s, W	0.2 mm	77%
10Sat	+20°C	+15°C	—	4-5 m/s, SW	0.2 mm	82%
11Sun	+24°C	+15°C	—	3-4 m/s, SE	0 mm	72%
12Mon	+26°C	+17°C	—	5-6 m/s, SE	0 mm	66%
13Tue	+25°C	+18°C	—	3-4 m/s, ESE	0 mm	84%
14Wed	+24°C	+17°C	—	4-5 m/s, SW	0 mm	84%
15Thu	+23°C	+14°C	—	3 m/s, N	0 mm	81%
16Fri	+21°C	+12°C	—	5-7 m/s, N	0 mm	72%
17Sat	+20°C	+11°C	—	4 m/s, NNE	0 mm	55%
18Sun	+21°C	+9°C	—	4-5 m/s, NNE	0 mm	61%
19Mon	+22°C	+10°C	—	5 m/s, ENE	0 mm	64%
20Tue	+22°C	+10°C	—	4-5 m/s, ENE	0 mm	60%
21Wed	+22°C	+12°C	—	3-5 m/s, ENE	0 mm	71%
22Thu	+22°C	+12°C	—	3-4 m/s, E	0 mm	52%
23Fri	+18°C	+13°C	—	2-3 m/s, E	0.4 mm	46%
24Sat	+19°C	+11°C	—	4-6 m/s, N	0 mm	71%
25Sun	+19°C	+11°C	—	5-6 m/s, NNE	0 mm	70%
26Mon	+16°C	+10°C	—	6-9 m/s, WSW	0.2 mm	76%
27Tue	+20°C	+11°C	—	6-8 m/s, W	0 mm	65%
28Wed	+17°C	+11°C	—	7-9 m/s, NW	0.1 mm	74%
29Thu	+18°C	+9°C	—	5-6 m/s, NNW	0.1 mm	69%
30Fri	+18°C	+10°C	—	4-7 m/s, SW	0.8 mm	74%

Weather highs and lows in Vannes for september

Warmest day: 12 september, +26°C
Coldest night: 18 september, +9°C
Max precipitation: 8 september, 3.9 mm
Warmest water: —
Coldest water: —

Climate in Vannes in september

Year: 2022
Average daytime temperature: +21°C
Average nighttime temperature: +14°C
Water temperature: —
Precipitation (month): 7.7 mm
Days with precipitation: 1
Humidity: 72%
Wind: 5 m/s

Daily air temperature for the month

Day Night

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September	Day	Night	Sea t°	Wind	Precip	Humidity
1Wed	+25°C	+14°C	—	7-8 m/s, ENE	0 mm	64%
2Thu	+27°C	+13°C	—	7-8 m/s, ENE	0 mm	61%
3Fri	+25°C	+16°C	—	5-6 m/s, ENE	0 mm	66%
4Sat	+24°C	+16°C	—	3 m/s, SW	0 mm	70%
5Sun	+27°C	+17°C	—	2-3 m/s, S	0 mm	70%
6Mon	+32°C	+18°C	—	4 m/s, E	0 mm	60%
7Tue	+29°C	+20°C	—	6-8 m/s, E	0 mm	52%
8Wed	+24°C	+18°C	—	4-5 m/s, W	3.5 mm	80%
9Thu	+22°C	+18°C	—	5-7 m/s, SSW	0.5 mm	88%
10Fri	+22°C	+16°C	—	4-5 m/s, WSW	0.1 mm	83%
11Sat	+22°C	+14°C	—	3-4 m/s, WSW	0 mm	74%
12Sun	+24°C	+14°C	—	2-4 m/s, SSE	0 mm	70%
13Mon	+27°C	+16°C	—	4-5 m/s, SE	0 mm	54%
14Tue	+24°C	+16°C	—	4 m/s, SE	1.3 mm	71%
15Wed	+24°C	+15°C	—	3-4 m/s, N	0.3 mm	74%
16Thu	+23°C	+14°C	—	3-4 m/s, WNW	0 mm	73%
17Fri	+20°C	+14°C	—	4-6 m/s, SSW	0.7 mm	82%
18Sat	+21°C	+15°C	—	5-6 m/s, W	0.9 mm	75%
19Sun	+20°C	+13°C	—	4 m/s, W	0.5 mm	76%
20Mon	+19°C	+11°C	—	5-6 m/s, N	0 mm	78%
21Tue	+23°C	+13°C	—	5-6 m/s, NE	0 mm	70%
22Wed	+23°C	+12°C	—	4-5 m/s, NE	0 mm	62%
23Thu	+23°C	+12°C	—	3-4 m/s, N	0 mm	62%
24Fri	+22°C	+13°C	—	2-4 m/s, N	0 mm	81%
25Sat	+22°C	+14°C	—	4-5 m/s, SE	0.7 mm	72%
26Sun	+20°C	+15°C	—	4-6 m/s, SW	1.1 mm	89%
27Mon	+19°C	+14°C	—	7-9 m/s, W	2.6 mm	72%
28Tue	+18°C	+14°C	—	4-6 m/s, SW	0 mm	76%
29Wed	+18°C	+11°C	—	5-6 m/s, NW	0.2 mm	69%
30Thu	+18°C	+10°C	—	4-6 m/s, SW	0 mm	65%

Weather highs and lows in Vannes for september

Warmest day: 6 september, +32°C
Coldest night: 30 september, +10°C
Max precipitation: 8 september, 3.5 mm
Warmest water: —
Coldest water: —

Climate in Vannes in september

Year: 2021
Average daytime temperature: +23°C
Average nighttime temperature: +15°C
Water temperature: —
Precipitation (month): 12.4 mm
Days with precipitation: 4
Humidity: 71%
Wind: 4 m/s

Daily air temperature for the month

Day Night

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September	Day	Night	Sea t°	Wind	Precip	Humidity
1Tue	+20°C	+12°C	—	3-4 m/s, SSW	0 mm	70%
2Wed	+21°C	+12°C	—	3-4 m/s, S	0 mm	72%
3Thu	+21°C	+15°C	—	3-5 m/s, SW	0 mm	78%
4Fri	+22°C	+16°C	—	2-4 m/s, S	0 mm	81%
5Sat	+19°C	+13°C	—	5 m/s, NNW	0 mm	73%
6Sun	+18°C	+11°C	—	4 m/s, WNW	0 mm	74%
7Mon	+20°C	+12°C	—	3-4 m/s, SSW	0 mm	78%
8Tue	+22°C	+13°C	—	2-3 m/s, WSW	0 mm	71%
9Wed	+24°C	+15°C	—	3-4 m/s, SSW	0 mm	71%
10Thu	+22°C	+16°C	—	3-4 m/s, WSW	0 mm	81%
11Fri	+22°C	+14°C	—	3-5 m/s, S	0 mm	77%
12Sat	+21°C	+11°C	—	3-5 m/s, SSW	0 mm	72%
13Sun	+26°C	+14°C	—	3-5 m/s, SE	0 mm	63%
14Mon	+26°C	+17°C	—	4-5 m/s, SE	0 mm	60%
15Tue	+26°C	+17°C	—	2 m/s, S	0 mm	74%
16Wed	+27°C	+16°C	—	4-5 m/s, NNE	0 mm	68%
17Thu	+27°C	+16°C	—	6-7 m/s, ENE	0 mm	73%
18Fri	+27°C	+17°C	—	7-8 m/s, ENE	0 mm	60%
19Sat	+22°C	+18°C	—	3-4 m/s, SE	0 mm	89%
20Sun	+23°C	+17°C	—	2-3 m/s, SE	0.3 mm	85%
21Mon	+21°C	+17°C	—	2-4 m/s, WSW	0.1 mm	89%
22Tue	+20°C	+15°C	—	4-6 m/s, W	0.3 mm	86%
23Wed	+19°C	+13°C	—	6-8 m/s, SW	3.1 mm	84%
24Thu	+16°C	+10°C	—	8-9 m/s, WSW	1.5 mm	72%
25Fri	+16°C	+10°C	—	9-10 m/s, NW	0 mm	64%
26Sat	+15°C	+9°C	—	6-7 m/s, NW	0 mm	67%
27Sun	+16°C	+9°C	—	6-8 m/s, NNW	0 mm	70%
28Mon	+17°C	+9°C	—	5 m/s, WNW	0 mm	80%
29Tue	+18°C	+14°C	—	4 m/s, WSW	0 mm	88%
30Wed	+17°C	+13°C	—	7-9 m/s, SSW	1.6 mm	87%

Weather highs and lows in Vannes for september

Warmest day: 16 september, +27°C
Coldest night: 26 september, +9°C
Max precipitation: 23 september, 3.1 mm
Warmest water: —
Coldest water: —

Climate in Vannes in september

Year: 2020
Average daytime temperature: +21°C
Average nighttime temperature: +14°C
Water temperature: —
Precipitation (month): 6.9 mm
Days with precipitation: 3
Humidity: 75%
Wind: 4 m/s

Weather in Vannes in september by year

Year	Day	Night	Precipitation	Days with precipitation	Water
2025	+19°C	+13°C	10 mm	5	—
2024	+19°C	+13°C	14.4 mm	6	—
2023	+23°C	+16°C	11.6 mm	2	—
2022	+21°C	+14°C	7.7 mm	1	—
2021	+23°C	+15°C	12.4 mm	4	—
2020	+21°C	+14°C	6.9 mm	3	—

Comparison september in Vannes with other months

Month	Day	Night	Days with precipitation	Sunny days
January	+9°C	+5°C	6	7
February	+11°C	+6°C	5	7
March	+12°C	+6°C	5	8
April	+15°C	+8°C	4	10
May	+18°C	+11°C	3	9
June	+21°C	+14°C	3	12
July	+23°C	+15°C	3	13
August	+23°C	+15°C	3	15
September	+21°C	+14°C	4	11
October	+17°C	+12°C	6	9
November	+14°C	+9°C	5	7
December	+11°C	+7°C	8	6