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September

Brest Weather in September with Sea Temperature

September weather in Brest includes average daytime air +19°C, nighttime +13°C, average sea temperature +16°C. Daily water temperatures usually range from +15°C to +17°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	+20°C	+14°C	+16°C	4 m/s	1.2 mm	79%
2Tue	+20°C	+14°C	+17°C	5 m/s	1.4 mm	80%
3Wed	+22°C	+15°C	+16°C	6 m/s	0.3 mm	81%
4Thu	+21°C	+15°C	+16°C	5 m/s	0.6 mm	77%
5Fri	+21°C	+14°C	+16°C	4 m/s	0.1 mm	73%
6Sat	+23°C	+14°C	+16°C	4 m/s	0.3 mm	73%
7Sun	+22°C	+15°C	+16°C	5 m/s	0.5 mm	77%
8Mon	+20°C	+15°C	+16°C	4 m/s	1 mm	82%
9Tue	+20°C	+14°C	+16°C	5 m/s	0.5 mm	81%
10Wed	+19°C	+14°C	+16°C	4 m/s	0.1 mm	85%
11Thu	+19°C	+13°C	+16°C	4 m/s	0.2 mm	76%
12Fri	+19°C	+13°C	+16°C	4 m/s	0.2 mm	74%
13Sat	+21°C	+14°C	+16°C	4 m/s	0.3 mm	73%
14Sun	+21°C	+13°C	+16°C	3 m/s	0 mm	75%
15Mon	+20°C	+13°C	+16°C	4 m/s	0 mm	73%
16Tue	+20°C	+14°C	+16°C	4 m/s	0.1 mm	77%
17Wed	+20°C	+14°C	+16°C	5 m/s	0.2 mm	79%
18Thu	+20°C	+14°C	+16°C	5 m/s	0.8 mm	78%
19Fri	+20°C	+14°C	+16°C	5 m/s	0.6 mm	81%
20Sat	+19°C	+13°C	+16°C	5 m/s	1.3 mm	81%
21Sun	+19°C	+12°C	+16°C	4 m/s	1.1 mm	80%
22Mon	+18°C	+12°C	+16°C	4 m/s	0.9 mm	78%
23Tue	+17°C	+12°C	+15°C	4 m/s	0.6 mm	78%
24Wed	+17°C	+12°C	+15°C	5 m/s	0.3 mm	79%
25Thu	+17°C	+12°C	+15°C	5 m/s	0.3 mm	77%
26Fri	+17°C	+12°C	+16°C	5 m/s	0.7 mm	80%
27Sat	+17°C	+12°C	+16°C	6 m/s	0.3 mm	77%
28Sun	+16°C	+11°C	+16°C	5 m/s	0.7 mm	80%
29Mon	+17°C	+11°C	+16°C	5 m/s	0.3 mm	79%
30Tue	+17°C	+11°C	+16°C	6 m/s	0.8 mm	81%

Sea water temperature by months

Water +16°C

Day and night air temperature

Day +19°C Night +13°C

Weather highs and lows in Brest for september

Warmest day: 6 september, +23°C
Coldest night: 29 september, +11°C
Max precipitation: 2 september, 1.4 mm
Warmest sea water: 2 september, +17°C
Coldest sea water: 23 september, +15°C

Climate in Brest in september

Average daytime temperature: +19°C
Average nighttime temperature: +13°C
Sea water temperature: —
Precipitation (monthly average): 15.7 mm
Days with precipitation: 4.2
Humidity: 78%
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	+18°C	+14°C	—	6-7 m/s, W	0.9 mm	78%
2Tue	+19°C	+15°C	—	8-10 m/s, WSW	6.7 mm	86%
3Wed	+19°C	+16°C	—	10-12 m/s, SW	0.7 mm	86%
4Thu	+18°C	+14°C	—	8-9 m/s, W	0.6 mm	78%
5Fri	+19°C	+13°C	—	2-3 m/s, SW	0 mm	79%
6Sat	+25°C	+12°C	—	5-8 m/s, SE	0 mm	69%
7Sun	+19°C	+13°C	—	7-8 m/s, W	0.3 mm	85%
8Mon	+18°C	+12°C	—	4-5 m/s, WSW	0 mm	74%
9Tue	+16°C	+12°C	—	6-8 m/s, S	0.9 mm	87%
10Wed	+17°C	+13°C	—	5-8 m/s, S	0.5 mm	91%
11Thu	+17°C	+14°C	—	7-9 m/s, W	0.4 mm	76%
12Fri	+17°C	+13°C	—	7-8 m/s, WSW	0.8 mm	76%
13Sat	+17°C	+13°C	—	7 m/s, W	1.9 mm	80%
14Sun	+19°C	+14°C	—	6-11 m/s, SW	0 mm	95%
15Mon	+17°C	+14°C	—	10-11 m/s, W	0 mm	77%
16Tue	+17°C	+14°C	—	5-6 m/s, W	0 mm	79%
17Wed	+19°C	+15°C	—	6-8 m/s, SSW	0 mm	83%
18Thu	+21°C	+15°C	—	5-6 m/s, SSW	0 mm	83%
19Fri	+22°C	+13°C	—	3-5 m/s, SSW	0 mm	80%
20Sat	+17°C	+13°C	—	5-7 m/s, SSW	3.8 mm	89%
21Sun	+16°C	+11°C	—	4-5 m/s, SSW	0.6 mm	79%
22Mon	+14°C	+10°C	—	9-11 m/s, NE	5.2 mm	83%
23Tue	+15°C	+9°C	—	4-5 m/s, NE	0.1 mm	70%
24Wed	+17°C	+11°C	—	5-6 m/s, NE	0 mm	75%
25Thu	+16°C	+10°C	—	4-5 m/s, NE	0 mm	76%
26Fri	+17°C	+9°C	—	2-4 m/s, NE	0 mm	72%
27Sat	+18°C	+11°C	—	4-5 m/s, S	0 mm	76%
28Sun	+16°C	+12°C	—	4 m/s, N	0.1 mm	82%
29Mon	+17°C	+11°C	—	3-4 m/s, NNE	0 mm	83%
30Tue	+18°C	+11°C	—	3-4 m/s, NE	0 mm	78%

Weather highs and lows in Brest for september

Warmest day: 6 september, +25°C
Coldest night: 23 september, +9°C
Max precipitation: 2 september, 6.7 mm
Warmest water: —
Coldest water: —

Climate in Brest in september

Year: 2025
Average daytime temperature: +18°C
Average nighttime temperature: +13°C
Water temperature: —
Precipitation (month): 23.5 mm
Days with precipitation: 4
Humidity: 80%
Wind: 5 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	+22°C	+15°C	+16°C	3-4 m/s, NW	0 mm	84%
2Mon	+18°C	+13°C	+17°C	6 m/s, W	1.7 mm	83%
3Tue	+18°C	+13°C	+16°C	5 m/s, NW	0.5 mm	82%
4Wed	+17°C	+13°C	+16°C	5-7 m/s, NNW	0.2 mm	78%
5Thu	+17°C	+11°C	+16°C	3-4 m/s, N	0.1 mm	68%
6Fri	+20°C	+11°C	+16°C	3-4 m/s, ESE	0 mm	71%
7Sat	+18°C	+12°C	+16°C	3-6 m/s, NNE	2.5 mm	89%
8Sun	+18°C	+15°C	+16°C	6-7 m/s, WNW	5.4 mm	96%
9Mon	+17°C	+11°C	+16°C	5-7 m/s, NW	0.2 mm	82%
10Tue	+18°C	+12°C	+16°C	6-8 m/s, W	0.1 mm	84%
11Wed	+15°C	+11°C	+16°C	5-8 m/s, WNW	0.5 mm	77%
12Thu	+15°C	+10°C	+16°C	5-7 m/s, NNW	0 mm	66%
13Fri	+16°C	+9°C	+16°C	4-5 m/s, NNE	0 mm	65%
14Sat	+18°C	+9°C	+16°C	2-3 m/s, SE	0 mm	64%
15Sun	+18°C	+10°C	+16°C	2-3 m/s, SSW	0 mm	56%
16Mon	+19°C	+12°C	+16°C	3-5 m/s, NE	0 mm	76%
17Tue	+19°C	+13°C	+16°C	6-8 m/s, NE	0 mm	82%
18Wed	+21°C	+15°C	+16°C	7-9 m/s, ENE	0 mm	81%
19Thu	+22°C	+15°C	+16°C	7-8 m/s, ENE	0 mm	76%
20Fri	+22°C	+14°C	+16°C	6-7 m/s, NE	0 mm	76%
21Sat	+22°C	+13°C	+16°C	2-3 m/s, SE	4.4 mm	78%
22Sun	+19°C	+13°C	+16°C	3-5 m/s, SW	0.1 mm	86%
23Mon	+15°C	+13°C	+15°C	5-8 m/s, W	0.7 mm	94%
24Tue	+18°C	+13°C	+15°C	3-4 m/s, WNW	0.8 mm	87%
25Wed	+16°C	+13°C	+15°C	4-6 m/s, S	1.4 mm	94%
26Thu	+16°C	+12°C	+16°C	9-12 m/s, SW	1.5 mm	85%
27Fri	+14°C	+10°C	+16°C	9-10 m/s, N	0.1 mm	80%
28Sat	+15°C	+9°C	+16°C	3-4 m/s, N	0 mm	66%
29Sun	+16°C	+10°C	+16°C	8-11 m/s, SSE	0.3 mm	84%
30Mon	+16°C	+12°C	+16°C	10-12 m/s, W	0.4 mm	84%

Weather highs and lows in Brest for september

Warmest day: 1 september, +22°C
Coldest night: 13 september, +9°C
Max precipitation: 8 september, 5.4 mm
Warmest water: 2 september, +17°C
Coldest water: 23 september, +15°C

Climate in Brest in september

Year: 2024
Average daytime temperature: +18°C
Average nighttime temperature: +12°C
Water temperature: —
Precipitation (month): 20.9 mm
Days with precipitation: 6
Humidity: 79%
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	+19°C	+14°C	—	3-5 m/s, WNW	3 mm	82%
2Sat	+22°C	+13°C	—	3-5 m/s, NNE	0.1 mm	72%
3Sun	+27°C	+15°C	—	5-6 m/s, NE	0 mm	73%
4Mon	+31°C	+20°C	—	5-6 m/s, E	0 mm	53%
5Tue	+27°C	+18°C	—	3-4 m/s, SW	0 mm	60%
6Wed	+29°C	+17°C	—	3 m/s, E	0 mm	68%
7Thu	+28°C	+18°C	—	2-3 m/s, WSW	0 mm	68%
8Fri	+27°C	+18°C	—	2-5 m/s, NW	0 mm	66%
9Sat	+26°C	+18°C	—	2-3 m/s, W	0 mm	66%
10Sun	+23°C	+17°C	—	3-4 m/s, SW	0 mm	74%
11Mon	+22°C	+16°C	—	3-4 m/s, SW	0.1 mm	82%
12Tue	+20°C	+14°C	—	3-4 m/s, NW	0 mm	83%
13Wed	+20°C	+14°C	—	3-4 m/s, NNE	0.1 mm	85%
14Thu	+22°C	+12°C	—	2-4 m/s, NNE	0 mm	73%
15Fri	+23°C	+13°C	—	3-4 m/s, SSW	0 mm	73%
16Sat	+23°C	+15°C	—	3-4 m/s, SE	0.4 mm	80%
17Sun	+22°C	+15°C	—	4 m/s, SSW	0.2 mm	84%
18Mon	+18°C	+14°C	—	5-6 m/s, WNW	0.7 mm	86%
19Tue	+19°C	+16°C	—	7-9 m/s, SW	0.3 mm	80%
20Wed	+18°C	+14°C	—	9-11 m/s, SSW	4.3 mm	88%
21Thu	+15°C	+12°C	—	6-7 m/s, SW	1.5 mm	81%
22Fri	+16°C	+11°C	—	5-6 m/s, W	0.1 mm	74%
23Sat	+17°C	+11°C	—	3-6 m/s, SW	0 mm	69%
24Sun	+20°C	+16°C	—	9-11 m/s, S	0 mm	82%
25Mon	+19°C	+14°C	—	4-6 m/s, SW	0 mm	82%
26Tue	+19°C	+14°C	—	5-7 m/s, SW	1.5 mm	86%
27Wed	+19°C	+14°C	—	7-9 m/s, S	0 mm	87%
28Thu	+19°C	+13°C	—	6-9 m/s, S	0.3 mm	84%
29Fri	+19°C	+11°C	—	5-8 m/s, NW	0 mm	76%
30Sat	+20°C	+11°C	—	4-6 m/s, SSW	0 mm	79%

Weather highs and lows in Brest for september

Warmest day: 4 september, +31°C
Coldest night: 22 september, +11°C
Max precipitation: 20 september, 4.3 mm
Warmest water: —
Coldest water: —

Climate in Brest in september

Year: 2023
Average daytime temperature: +22°C
Average nighttime temperature: +15°C
Water temperature: —
Precipitation (month): 12.6 mm
Days with precipitation: 4
Humidity: 77%
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	—	4-6 m/s, NE	3.4 mm	81%
2Fri	+21°C	+15°C	—	2-4 m/s, NNW	0 mm	86%
3Sat	+20°C	+14°C	—	5-8 m/s, SSW	0.4 mm	83%
4Sun	+18°C	+17°C	—	8-10 m/s, S	2.5 mm	92%
5Mon	+21°C	+16°C	—	8-9 m/s, SSW	0.2 mm	84%
6Tue	+18°C	+15°C	—	7-8 m/s, SSW	1.8 mm	85%
7Wed	+20°C	+15°C	—	7-8 m/s, SW	0.5 mm	83%
8Thu	+19°C	+15°C	—	7-8 m/s, WSW	0.4 mm	86%
9Fri	+19°C	+15°C	—	7 m/s, W	1.2 mm	84%
10Sat	+19°C	+14°C	—	3 m/s, SSW	0 mm	91%
11Sun	+24°C	+14°C	—	3-5 m/s, SSE	0 mm	68%
12Mon	+23°C	+17°C	—	4 m/s, ESE	0 mm	64%
13Tue	+23°C	+18°C	—	3-4 m/s, N	0 mm	80%
14Wed	+19°C	+16°C	—	4-6 m/s, NE	0.1 mm	93%
15Thu	+19°C	+13°C	—	5-7 m/s, N	0 mm	82%
16Fri	+17°C	+12°C	—	6 m/s, N	0 mm	72%
17Sat	+17°C	+10°C	—	4-5 m/s, NE	0 mm	63%
18Sun	+18°C	+8°C	—	3-6 m/s, NNE	0 mm	68%
19Mon	+20°C	+10°C	—	3-5 m/s, ENE	0 mm	71%
20Tue	+20°C	+11°C	—	4-5 m/s, ENE	0 mm	71%
21Wed	+21°C	+11°C	—	2-3 m/s, ENE	0 mm	75%
22Thu	+20°C	+11°C	—	2-3 m/s, SW	0 mm	65%
23Fri	+17°C	+13°C	—	2-5 m/s, W	1.7 mm	64%
24Sat	+16°C	+11°C	—	5 m/s, N	0.2 mm	76%
25Sun	+18°C	+10°C	—	5-7 m/s, NE	0 mm	73%
26Mon	+16°C	+11°C	—	6-8 m/s, W	0.5 mm	82%
27Tue	+18°C	+12°C	—	5-6 m/s, WNW	0.5 mm	74%
28Wed	+15°C	+11°C	—	6-8 m/s, NW	0 mm	78%
29Thu	+17°C	+10°C	—	5-8 m/s, N	0.1 mm	78%
30Fri	+17°C	+10°C	—	5-9 m/s, WSW	0.5 mm	82%

Weather highs and lows in Brest for september

Warmest day: 11 september, +24°C
Coldest night: 18 september, +8°C
Max precipitation: 1 september, 3.4 mm
Warmest water: —
Coldest water: —

Climate in Brest in september

Year: 2022
Average daytime temperature: +19°C
Average nighttime temperature: +13°C
Water temperature: —
Precipitation (month): 14 mm
Days with precipitation: 5
Humidity: 78%
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	+22°C	+13°C	—	7-8 m/s, ENE	0 mm	74%
2Thu	+23°C	+14°C	—	7-8 m/s, NE	0 mm	75%
3Fri	+25°C	+14°C	—	4-6 m/s, ENE	0 mm	74%
4Sat	+24°C	+15°C	—	2 m/s, SW	0 mm	71%
5Sun	+25°C	+16°C	—	2-3 m/s, SW	0 mm	72%
6Mon	+30°C	+16°C	—	3-4 m/s, E	0 mm	67%
7Tue	+30°C	+20°C	—	5-7 m/s, ESE	0 mm	52%
8Wed	+20°C	+16°C	—	3-5 m/s, SSW	0.1 mm	90%
9Thu	+22°C	+16°C	—	5-6 m/s, SW	0.8 mm	86%
10Fri	+20°C	+14°C	—	4-6 m/s, NW	0 mm	87%
11Sat	+21°C	+14°C	—	3-4 m/s, W	0 mm	74%
12Sun	+22°C	+12°C	—	2-4 m/s, SSE	0.1 mm	72%
13Mon	+25°C	+15°C	—	3 m/s, SSE	0 mm	54%
14Tue	+24°C	+14°C	—	4-5 m/s, NE	0.1 mm	68%
15Wed	+19°C	+13°C	—	4 m/s, NNW	0 mm	82%
16Thu	+20°C	+13°C	—	2-3 m/s, NW	0.1 mm	77%
17Fri	+20°C	+13°C	—	5-7 m/s, SSW	1.1 mm	83%
18Sat	+19°C	+13°C	—	3-5 m/s, NW	3.9 mm	80%
19Sun	+18°C	+12°C	—	4 m/s, SW	0.1 mm	85%
20Mon	+19°C	+13°C	—	5-6 m/s, N	0 mm	74%
21Tue	+20°C	+12°C	—	4-5 m/s, NE	0 mm	76%
22Wed	+20°C	+11°C	—	4-6 m/s, NE	0 mm	70%
23Thu	+20°C	+12°C	—	3-4 m/s, NNW	0 mm	80%
24Fri	+20°C	+13°C	—	2-3 m/s, W	0 mm	75%
25Sat	+21°C	+12°C	—	2-3 m/s, ESE	0 mm	64%
26Sun	+20°C	+14°C	—	5-9 m/s, SSW	0.5 mm	85%
27Mon	+18°C	+13°C	—	6-8 m/s, W	0.9 mm	71%
28Tue	+16°C	+13°C	—	6-8 m/s, SSW	3.8 mm	84%
29Wed	+17°C	+11°C	—	4-5 m/s, NW	0.6 mm	67%
30Thu	+17°C	+11°C	—	6-9 m/s, SW	0 mm	75%

Weather highs and lows in Brest for september

Warmest day: 6 september, +30°C
Coldest night: 22 september, +11°C
Max precipitation: 18 september, 3.9 mm
Warmest water: —
Coldest water: —

Climate in Brest in september

Year: 2021
Average daytime temperature: +21°C
Average nighttime temperature: +14°C
Water temperature: —
Precipitation (month): 12.1 mm
Days with precipitation: 3
Humidity: 75%
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	+18°C	+12°C	—	2-3 m/s, WSW	0.1 mm	74%
2Wed	+19°C	+12°C	—	3-4 m/s, SSW	0 mm	76%
3Thu	+20°C	+15°C	—	5-6 m/s, SW	0.1 mm	90%
4Fri	+18°C	+13°C	—	3-4 m/s, WSW	0.1 mm	90%
5Sat	+17°C	+12°C	—	4-5 m/s, NNW	0 mm	77%
6Sun	+17°C	+12°C	—	4-5 m/s, WNW	0.1 mm	78%
7Mon	+18°C	+12°C	—	3 m/s, NNW	0 mm	82%
8Tue	+20°C	+14°C	—	2-3 m/s, WNW	0 mm	82%
9Wed	+20°C	+14°C	—	2-3 m/s, NW	0 mm	81%
10Thu	+18°C	+12°C	—	4 m/s, WSW	0 mm	81%
11Fri	+17°C	+11°C	—	3-4 m/s, SW	0 mm	81%
12Sat	+18°C	+11°C	—	2 m/s, W	0 mm	80%
13Sun	+26°C	+13°C	—	1-2 m/s, SE	0 mm	71%
14Mon	+26°C	+15°C	—	2-3 m/s, S	0 mm	55%
15Tue	+23°C	+17°C	—	2 m/s, WNW	0 mm	69%
16Wed	+22°C	+16°C	—	3-5 m/s, NNE	0 mm	78%
17Thu	+22°C	+16°C	—	7 m/s, ENE	0 mm	81%
18Fri	+23°C	+16°C	—	7-8 m/s, ENE	0.5 mm	67%
19Sat	+18°C	+16°C	—	3-4 m/s, NE	3.1 mm	95%
20Sun	+20°C	+15°C	—	3 m/s, NNE	0 mm	90%
21Mon	+21°C	+15°C	—	3 m/s, NNE	0 mm	89%
22Tue	+19°C	+15°C	—	3-5 m/s, WSW	0.1 mm	88%
23Wed	+15°C	+11°C	—	4-6 m/s, WNW	1.3 mm	90%
24Thu	+13°C	+10°C	—	8-10 m/s, W	0.6 mm	76%
25Fri	+14°C	+10°C	—	10 m/s, NNW	0.2 mm	70%
26Sat	+13°C	+9°C	—	5-6 m/s, ESE	0.2 mm	69%
27Sun	+14°C	+9°C	—	5-7 m/s, NNW	0 mm	75%
28Mon	+17°C	+10°C	—	4-5 m/s, W	0.2 mm	84%
29Tue	+16°C	+12°C	—	2-3 m/s, NNW	0.6 mm	84%
30Wed	+15°C	+12°C	—	5-9 m/s, SSW	3.7 mm	88%

Weather highs and lows in Brest for september

Warmest day: 13 september, +26°C
Coldest night: 26 september, +9°C
Max precipitation: 30 september, 3.7 mm
Warmest water: —
Coldest water: —

Climate in Brest in september

Year: 2020
Average daytime temperature: +19°C
Average nighttime temperature: +13°C
Water temperature: —
Precipitation (month): 10.9 mm
Days with precipitation: 3
Humidity: 80%
Wind: 4 m/s

Weather in Brest in september by year

Year	Day	Night	Precipitation	Days with precipitation	Water
2025	+18°C	+13°C	23.5 mm	4	—
2024	+18°C	+12°C	20.9 mm	6	—
2023	+22°C	+15°C	12.6 mm	4	—
2022	+19°C	+13°C	14 mm	5	—
2021	+21°C	+14°C	12.1 mm	3	—
2020	+19°C	+13°C	10.9 mm	3	—

Comparison september in Brest with other months

Month	Day	Night	Days with precipitation	Sunny days
January	+10°C	+6°C	7	5
February	+11°C	+6°C	7	4
March	+12°C	+7°C	6	7
April	+14°C	+8°C	4	8
May	+16°C	+10°C	3	9
June	+19°C	+12°C	4	10
July	+21°C	+14°C	3	10
August	+21°C	+14°C	4	11
September	+19°C	+13°C	4	9
October	+16°C	+12°C	6	7
November	+13°C	+9°C	6	3
December	+11°C	+7°C	8	4