Saint-Brieuc Weather in September with Sea Temperature
September weather in Saint-Brieuc includes average daytime air +20°C, nighttime +13°C, average sea temperature +18°C. Daily water temperatures usually range from +17°C to +18°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.
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 |  +14°C | +18°C | 4 m/s | 1 mm | 79% |
| 2Tue | +21°C |  +13°C | +18°C | 4 m/s | 0.1 mm | 80% |
| 3Wed | +23°C | +14°C | +18°C | 5 m/s | 0 mm | 79% |
| 4Thu |  +23°C | +14°C | +18°C | 5 m/s | 0.1 mm | 74% |
| 5Fri | +23°C | +14°C | +18°C | 4 m/s | 0.1 mm | 70% |
| 6Sat |  +23°C | +14°C | +18°C | 4 m/s | 0.1 mm | 72% |
| 7Sun | +23°C | +15°C | +18°C | 4 m/s | 0.3 mm | 73% |
| 8Mon | +21°C |  +14°C | +18°C | 4 m/s | 0.4 mm | 78% |
| 9Tue | +22°C |  +14°C | +18°C | 5 m/s | 0 mm | 74% |
| 10Wed | +21°C | +13°C | +18°C | 4 m/s | 0.1 mm | 81% |
| 11Thu | +21°C | +12°C | +17°C | 4 m/s | 0.2 mm | 76% |
| 12Fri | +21°C | +12°C | +18°C | 4 m/s | 0.1 mm | 73% |
| 13Sat | +21°C | +13°C | +17°C | 4 m/s | 0.3 mm | 73% |
| 14Sun | +22°C | +13°C | +17°C | 3 m/s | 0.5 mm | 75% |
| 15Mon | +22°C | +13°C | +17°C | 4 m/s | 0 mm | 72% |
| 16Tue | +20°C | +13°C | +17°C | 3 m/s | 0 mm | 76% |
| 17Wed | +21°C | +13°C | +17°C | 5 m/s | 0 mm | 75% |
| 18Thu | +21°C | +13°C | +17°C | 4 m/s | 0.3 mm | 76% |
| 19Fri |  +22°C | +14°C | +18°C | 4 m/s | 0.9 mm | 75% |
| 20Sat | +20°C | +12°C | +18°C | 5 m/s | 0.7 mm | 79% |
| 21Sun | +19°C | +12°C | +18°C | 3 m/s | 0.6 mm | 81% |
| 22Mon | +19°C | +11°C | +17°C | 4 m/s | 1 mm | 77% |
| 23Tue | +17°C | +10°C | +17°C | 4 m/s | 0.2 mm | 74% |
| 24Wed | +18°C | +11°C | +17°C | 5 m/s | 0.7 mm | 79% |
| 25Thu | +18°C | +11°C | +17°C | 5 m/s | 0.1 mm | 75% |
| 26Fri | +18°C | +11°C | +17°C | 5 m/s | 0.5 mm | 74% |
| 27Sat | +17°C | +11°C | +17°C | 6 m/s | 0.3 mm | 74% |
| 28Sun |  +17°C | +10°C | +17°C | 4 m/s | 0.3 mm | 76% |
| 29Mon | +17°C | +11°C | +17°C | 4 m/s | 0.4 mm | 77% |
| 30Tue | +18°C | +10°C | +17°C | 5 m/s | 0.8 mm | 75% |
Sea water temperature by months
Water +18°C
Day and night air temperature
Day +20°C
Night +13°C
Weather highs and lows in Saint-Brieuc for september
- Warmest day: 5 september, +23°C
- Coldest night: 28 september, +10°C
- Max precipitation: 1 september, 1 mm
- Warmest sea water: 1 september, +18°C
- Coldest sea water: 11 september, +17°C
Climate in Saint-Brieuc in september
- Average daytime temperature: +20°C
- Average nighttime temperature: +13°C
- Sea water temperature: —
- Precipitation (monthly average): 10.3 mm
- Days with precipitation: 3
- Humidity: 76%
- Wind: 4 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 |  +20°C | +12°C | — | 6-8 m/s, W | 0.2 mm | 74% |
| 2Tue | +21°C | +12°C | — | 8-9 m/s, WSW | 0.3 mm | 78% |
| 3Wed | +22°C | +15°C | — | 10-12 m/s, SW | 0.1 mm | 78% |
| 4Thu | +20°C |  +13°C | — | 7-8 m/s, W | 0.1 mm | 72% |
| 5Fri | +21°C | +12°C | — | 3-4 m/s, SW | 0 mm | 76% |
| 6Sat | +27°C | +12°C | — | 5-7 m/s, SE | 0 mm | 60% |
| 7Sun | +22°C | +13°C | — | 6-10 m/s, SSW | 0 mm | 72% |
| 8Mon | +20°C | +11°C | — | 4-5 m/s, WSW | 0.7 mm | 75% |
| 9Tue | +20°C | +10°C | — | 5-7 m/s, SSW | 0 mm | 76% |
| 10Wed | +17°C | +12°C | — | 5-7 m/s, S | 0.1 mm | 90% |
| 11Thu | +20°C | +11°C | — | 7-8 m/s, W | 0.5 mm | 80% |
| 12Fri | +19°C | +10°C | — | 6-8 m/s, WSW | 0.2 mm | 74% |
| 13Sat | +18°C | +12°C | — | 7-8 m/s, WSW | 0.4 mm | 74% |
| 14Sun |  +22°C | +12°C | — | 5-10 m/s, SW | 0.2 mm | 89% |
| 15Mon | +19°C | +12°C | — | 9-11 m/s, W | 0 mm | 69% |
| 16Tue | +18°C | +12°C | — | 5-6 m/s, W | 0 mm | 75% |
| 17Wed | +23°C | +13°C | — | 5-7 m/s, SW | 0 mm | 71% |
| 18Thu | +26°C | +14°C | — | 3-4 m/s, SSW | 0 mm | 76% |
| 19Fri | +29°C | +14°C | — | 3-6 m/s, S | 0 mm | 59% |
| 20Sat | +23°C | +10°C | — | 5-8 m/s, SSW | 0 mm | 71% |
| 21Sun | +16°C | +10°C | — | 3-4 m/s, SW | 2 mm | 83% |
| 22Mon | +13°C |  +11°C | — | 8-9 m/s, NE | 3.5 mm | 84% |
| 23Tue | +15°C | +10°C | — | 5-7 m/s, NNE | 0 mm | 67% |
| 24Wed | +16°C | +11°C | — | 5-6 m/s, NNE | 0.4 mm | 79% |
| 25Thu | +16°C | +10°C | — | 5-6 m/s, NE | 0 mm | 66% |
| 26Fri | +15°C | +9°C | — | 3-4 m/s, NNE | 0.1 mm | 72% |
| 27Sat | +19°C | +10°C | — | 2-3 m/s, S | 0 mm | 72% |
| 28Sun | +18°C | +11°C | — | 2-3 m/s, N | 0 mm | 72% |
| 29Mon | +17°C | +11°C | — | 3-4 m/s, NNE | 0 mm | 80% |
| 30Tue | +18°C | +11°C | — | 2-3 m/s, NE | 0 mm | 72% |
Weather highs and lows in Saint-Brieuc for september
- Warmest day: 19 september, +29°C
- Coldest night: 26 september, +9°C
- Max precipitation: 22 september, 3.5 mm
- Warmest water: —
- Coldest water: —
Climate in Saint-Brieuc in september
- Year: 2025
- Average daytime temperature: +20°C
- Average nighttime temperature: +12°C
- Water temperature: —
- Precipitation (month): 8.8 mm
- Days with precipitation: 2
- Humidity: 75%
- 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 |  +17°C | +18°C | 2-3 m/s, NNW | 3 mm | 91% |
| 2Mon | +21°C | +13°C | +18°C | 4-5 m/s, WSW | 0.2 mm | 84% |
| 3Tue | +19°C | +11°C | +18°C | 5 m/s, NW | 0 mm | 80% |
| 4Wed | +19°C | +11°C | +18°C | 4-6 m/s, NW | 0.1 mm | 78% |
| 5Thu | +18°C | +12°C | +18°C | 3 m/s, NW | 0.1 mm | 73% |
| 6Fri | +19°C | +13°C | +18°C | 3 m/s, ESE | 0 mm | 68% |
| 7Sat | +17°C | +13°C | +18°C | 3-5 m/s, NE | 2 mm | 85% |
| 8Sun |  +17°C | +12°C | +18°C | 6-9 m/s, WSW | 0.9 mm | 94% |
| 9Mon | +17°C | +11°C | +18°C | 7-8 m/s, NW | 0 mm | 80% |
| 10Tue | +20°C | +10°C | +18°C | 6-8 m/s, W | 0.1 mm | 79% |
| 11Wed | +16°C | +9°C | +17°C | 6-8 m/s, WNW | 0.2 mm | 76% |
| 12Thu | +14°C | +9°C | +18°C | 5-8 m/s, NNW | 0.1 mm | 67% |
| 13Fri | +15°C | +9°C | +17°C | 4 m/s, ENE | 0 mm | 69% |
| 14Sat | +17°C | +7°C | +17°C | 3-4 m/s, E | 0 mm | 62% |
| 15Sun | +19°C | +9°C | +17°C | 2-4 m/s, E | 0 mm | 61% |
| 16Mon | +18°C | +10°C | +17°C | 3-6 m/s, NNE | 0 mm | 77% |
| 17Tue | +19°C | +13°C | +17°C | 7-9 m/s, NE | 0 mm | 83% |
| 18Wed | +21°C | +15°C | +17°C | 7-8 m/s, NE | 0.1 mm | 82% |
| 19Thu | +21°C | +15°C | +18°C | 6-8 m/s, ENE | 0 mm | 78% |
| 20Fri | +21°C | +14°C | +18°C | 4-5 m/s, NE | 0.5 mm | 76% |
| 21Sat | +21°C | +12°C | +18°C | 3-4 m/s, SE | 0.7 mm | 80% |
| 22Sun | +22°C | +12°C | +17°C | 3 m/s, SSW | 0.4 mm | 83% |
| 23Mon | +14°C | +11°C | +17°C | 4-6 m/s, SW | 0.5 mm | 94% |
| 24Tue | +18°C | +12°C | +17°C | 4-7 m/s, WNW | 0.4 mm | 86% |
| 25Wed | +15°C | +12°C | +17°C | 4-5 m/s, SSW | 0.3 mm | 93% |
| 26Thu | +18°C |  +12°C | +17°C | 8-10 m/s, SW | 1.1 mm | 78% |
| 27Fri | +13°C | +9°C | +17°C | 8-9 m/s, N | 0.2 mm | 74% |
| 28Sat | +14°C | +8°C | +17°C | 4-5 m/s, N | 0 mm | 71% |
| 29Sun | +15°C | +9°C | +17°C | 6-10 m/s, SSE | 0.1 mm | 77% |
| 30Mon | +16°C | +11°C | +17°C | 10-11 m/s, W | 0 mm | 79% |
Weather highs and lows in Saint-Brieuc for september
- Warmest day: 1 september, +22°C
- Coldest night: 14 september, +7°C
- Max precipitation: 1 september, 3 mm
- Warmest water: 1 september, +18°C
- Coldest water: 11 september, +17°C
Climate in Saint-Brieuc in september
- Year: 2024
- Average daytime temperature: +18°C
- Average nighttime temperature: +11°C
- Water temperature: —
- Precipitation (month): 11 mm
- Days with precipitation: 3
- 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 | +20°C | +14°C | — | 5-7 m/s, WNW | 0.4 mm | 85% |
| 2Sat | +21°C | +14°C | — | 3-4 m/s, NNE | 0 mm | 78% |
| 3Sun | +25°C | +15°C | — | 4-5 m/s, NE | 0 mm | 78% |
| 4Mon | +30°C | +17°C | — | 4-6 m/s, E | 0 mm | 64% |
| 5Tue | +31°C | +19°C | — | 2-3 m/s, WSW | 0 mm | 50% |
| 6Wed | +25°C | +17°C | — | 1-2 m/s, N | 0.5 mm | 71% |
| 7Thu | +28°C | +20°C | — | 2-3 m/s, NE | 0 mm | 60% |
| 8Fri | +27°C | +18°C | — | 2-3 m/s, N | 0 mm | 65% |
| 9Sat | +30°C | +18°C | — | 2-3 m/s, ESE | 0 mm | 60% |
| 10Sun | +29°C | +17°C | — | 3-4 m/s, WSW | 0.3 mm | 70% |
| 11Mon | +25°C | +15°C | — | 2-3 m/s, WNW | 0.1 mm | 78% |
| 12Tue | +21°C | +14°C | — | 3-4 m/s, NNW | 0.1 mm | 84% |
| 13Wed | +21°C | +15°C | — | 3-4 m/s, NNE | 0.1 mm | 83% |
| 14Thu | +21°C | +13°C | — | 3-4 m/s, NE | 0 mm | 77% |
| 15Fri | +27°C | +13°C | — | 2-4 m/s, SSE | 0 mm | 66% |
| 16Sat | +23°C | +16°C | — | 2-3 m/s, E | 0 mm | 72% |
| 17Sun | +25°C | +16°C | — | 4-6 m/s, SSE | 0.2 mm | 77% |
| 18Mon | +19°C | +14°C | — | 5-6 m/s, W | 0.2 mm | 82% |
| 19Tue | +21°C | +13°C | — | 7-9 m/s, WSW | 0 mm | 75% |
| 20Wed | +20°C | +14°C | — | 10-12 m/s, SSW | 3.8 mm | 82% |
| 21Thu | +17°C | +11°C | — | 5-6 m/s, SW | 1.1 mm | 80% |
| 22Fri | +18°C | +9°C | — | 5-6 m/s, WNW | 2.2 mm | 75% |
| 23Sat | +19°C | +9°C | — | 4 m/s, WSW | 0 mm | 67% |
| 24Sun | +21°C | +12°C | — | 7-9 m/s, S | 0.1 mm | 74% |
| 25Mon | +22°C | +14°C | — | 3-6 m/s, WSW | 0 mm | 73% |
| 26Tue | +22°C | +15°C | — | 4-5 m/s, WSW | 0.1 mm | 64% |
| 27Wed | +22°C | +13°C | — | 5-8 m/s, S | 0 mm | 82% |
| 28Thu | +21°C | +12°C | — | 5-8 m/s, SSW | 0 mm | 80% |
| 29Fri | +19°C | +12°C | — | 5-8 m/s, NW | 0 mm | 73% |
| 30Sat | +23°C | +10°C | — | 3-4 m/s, S | 0 mm | 70% |
Weather highs and lows in Saint-Brieuc for september
- Warmest day: 5 september, +31°C
- Coldest night: 22 september, +9°C
- Max precipitation: 20 september, 3.8 mm
- Warmest water: —
- Coldest water: —
Climate in Saint-Brieuc in september
- Year: 2023
- Average daytime temperature: +23°C
- Average nighttime temperature: +14°C
- Water temperature: —
- Precipitation (month): 9.2 mm
- Days with precipitation: 3
- 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 |  +24°C | +17°C | — | 3-5 m/s, ENE | 2.4 mm | 72% |
| 2Fri | +20°C | +15°C | — | 2-3 m/s, NW | 0.3 mm | 89% |
| 3Sat | +22°C | +13°C | — | 5-7 m/s, SSW | 0 mm | 80% |
| 4Sun | +23°C | +16°C | — | 7-8 m/s, S | 0 mm | 72% |
| 5Mon | +26°C | +16°C | — | 6-7 m/s, SSW | 0.2 mm | 69% |
| 6Tue | +20°C | +15°C | — | 6-8 m/s, SSW | 0.3 mm | 81% |
| 7Wed | +20°C | +15°C | — | 6 m/s, SW | 0 mm | 78% |
| 8Thu | +20°C | +15°C | — | 6-7 m/s, WSW | 0.3 mm | 71% |
| 9Fri | +20°C | +14°C | — | 8 m/s, W | 0 mm | 73% |
| 10Sat | +21°C | +13°C | — | 3-5 m/s, WSW | 0 mm | 80% |
| 11Sun | +26°C | +13°C | — | 3-4 m/s, SSE | 0 mm | 69% |
| 12Mon | +27°C | +15°C | — | 4-5 m/s, SE | 0 mm | 61% |
| 13Tue | +24°C | +17°C | — | 3 m/s, ESE | 1.2 mm | 82% |
| 14Wed | +22°C | +16°C | — | 3-6 m/s, N | 0.3 mm | 90% |
| 15Thu | +20°C | +13°C | — | 4-5 m/s, N | 0 mm | 83% |
| 16Fri | +17°C | +12°C | — | 5-7 m/s, NNW | 0 mm | 73% |
| 17Sat | +17°C | +9°C | — | 4-5 m/s, NNE | 0 mm | 56% |
| 18Sun | +19°C | +8°C | — | 3-5 m/s, NNE | 0 mm | 68% |
| 19Mon | +19°C | +11°C | — | 3-5 m/s, ENE | 0 mm | 65% |
| 20Tue | +19°C | +9°C | — | 3-4 m/s, ENE | 0 mm | 70% |
| 21Wed | +21°C | +11°C | — | 3-4 m/s, ENE | 0 mm | 73% |
| 22Thu | +22°C | +11°C | — | 3 m/s, ESE | 0 mm | 60% |
| 23Fri | +18°C | +12°C | — | 2-4 m/s, S | 0.5 mm | 52% |
| 24Sat | +17°C | +11°C | — | 5-6 m/s, N | 2.9 mm | 76% |
| 25Sun | +17°C | +9°C | — | 4-6 m/s, NNE | 0.4 mm | 74% |
| 26Mon | +16°C | +10°C | — | 6-8 m/s, WSW | 1.4 mm | 78% |
| 27Tue | +17°C | +11°C | — | 7-8 m/s, WNW | 0.1 mm | 72% |
| 28Wed | +15°C | +10°C | — | 6-7 m/s, NW | 0.6 mm | 78% |
| 29Thu | +16°C | +9°C | — | 5-6 m/s, NNW | 1.6 mm | 76% |
| 30Fri | +17°C | +10°C | — | 4-7 m/s, WSW | 0.3 mm | 74% |
Weather highs and lows in Saint-Brieuc for september
- Warmest day: 12 september, +27°C
- Coldest night: 18 september, +8°C
- Max precipitation: 24 september, 2.9 mm
- Warmest water: —
- Coldest water: —
Climate in Saint-Brieuc in september
- Year: 2022
- Average daytime temperature: +20°C
- Average nighttime temperature: +13°C
- Water temperature: —
- Precipitation (month): 12.8 mm
- Days with precipitation: 5
- 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 |
|---|---|---|---|---|---|---|
| 1Wed | +21°C | +13°C | — | 7-9 m/s, NE | 0 mm | 78% |
| 2Thu | +23°C | +14°C | — | 6-8 m/s, NE | 0 mm | 77% |
| 3Fri | +24°C | +14°C | — | 4 m/s, NE | 0 mm | 79% |
| 4Sat | +25°C | +14°C | — | 2-3 m/s, ESE | 0.1 mm | 69% |
| 5Sun | +26°C | +16°C | — | 2-3 m/s, ENE | 0 mm | 71% |
| 6Mon | +29°C | +16°C | — | 2-3 m/s, ENE | 0 mm | 72% |
| 7Tue | +29°C | +18°C | — | 4-6 m/s, ESE | 0 mm | 58% |
| 8Wed | +23°C | +16°C | — | 2-3 m/s, NW | 0.5 mm | 84% |
| 9Thu | +23°C | +16°C | — | 4-6 m/s, SSW | 0.2 mm | 79% |
| 10Fri | +21°C | +13°C | — | 4-5 m/s, WNW | 0 mm | 84% |
| 11Sat | +22°C | +12°C | — | 3-4 m/s, WNW | 0.1 mm | 72% |
| 12Sun | +23°C | +12°C | — | 2-5 m/s, ENE | 0 mm | 74% |
| 13Mon | +25°C | +14°C | — | 3-4 m/s, SE | 0.3 mm | 58% |
| 14Tue | +22°C | +14°C | — | 3-4 m/s, ENE | 2.7 mm | 78% |
| 15Wed | +21°C | +13°C | — | 4-5 m/s, N | 0 mm | 82% |
| 16Thu | +20°C | +13°C | — | 2-4 m/s, NNW | 0.2 mm | 77% |
| 17Fri | +21°C | +12°C | — | 4-6 m/s, SSW | 0 mm | 81% |
| 18Sat | +20°C | +14°C | — | 3-4 m/s, WNW | 1.2 mm | 76% |
| 19Sun | +19°C | +12°C | — | 4 m/s, WNW | 0.4 mm | 80% |
| 20Mon | +17°C | +11°C | — | 5-7 m/s, N | 0 mm | 84% |
| 21Tue | +19°C | +12°C | — | 3-5 m/s, NE | 0 mm | 78% |
| 22Wed | +20°C | +10°C | — | 3-4 m/s, NE | 0 mm | 72% |
| 23Thu | +20°C | +10°C | — | 3-4 m/s, NNW | 0 mm | 80% |
| 24Fri | +22°C | +12°C | — | 2-3 m/s, WNW | 0 mm | 80% |
| 25Sat | +22°C | +11°C | — | 2 m/s, E | 0 mm | 68% |
| 26Sun | +23°C | +14°C | — | 4-6 m/s, SW | 0 mm | 81% |
| 27Mon | +18°C | +12°C | — | 6-8 m/s, W | 1.7 mm | 71% |
| 28Tue | +16°C | +12°C | — | 5-6 m/s, SW | 0.9 mm | 74% |
| 29Wed | +16°C |  +9°C | — | 4-7 m/s, NNW | 0.8 mm | 70% |
| 30Thu | +19°C | +8°C | — | 5-7 m/s, SW | 0 mm | 67% |
Weather highs and lows in Saint-Brieuc for september
- Warmest day: 6 september, +29°C
- Coldest night: 30 september, +8°C
- Max precipitation: 14 september, 2.7 mm
- Warmest water: —
- Coldest water: —
Climate in Saint-Brieuc in september
- Year: 2021
- Average daytime temperature: +22°C
- Average nighttime temperature: +13°C
- Water temperature: —
- Precipitation (month): 9.1 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 | +17°C | +11°C | — | 2-4 m/s, NE | 0 mm | 75% |
| 2Wed | +22°C | +11°C | — | 2 m/s, WSW | 0 mm | 76% |
| 3Thu | +23°C | +15°C | — | 4-5 m/s, SW | 0 mm | 81% |
| 4Fri | +19°C | +14°C | — | 3-4 m/s, WSW | 0.4 mm | 90% |
| 5Sat | +17°C | +11°C | — | 5-6 m/s, NNW | 0 mm | 80% |
| 6Sun | +18°C | +10°C | — | 4 m/s, NW | 0 mm | 80% |
| 7Mon | +19°C | +12°C | — | 3 m/s, N | 0 mm | 82% |
| 8Tue | +21°C | +13°C | — | 2-3 m/s, ESE | 0 mm | 80% |
| 9Wed | +21°C | +13°C | — | 2-4 m/s, NNW | 0 mm | 78% |
| 10Thu | +19°C | +13°C | — | 3-4 m/s, NNW | 0 mm | 82% |
| 11Fri | +18°C | +11°C | — | 3-4 m/s, NNE | 0 mm | 80% |
| 12Sat | +19°C | +9°C | — | 2-3 m/s, NNW | 0 mm | 80% |
| 13Sun | +24°C | +13°C | — | 2-3 m/s, ESE | 0 mm | 72% |
| 14Mon | +28°C | +16°C | — | 3-5 m/s, SE | 0 mm | 56% |
| 15Tue | +23°C | +17°C | — | 3 m/s, NNW | 0 mm | 72% |
| 16Wed | +22°C | +15°C | — | 3-4 m/s, ESE | 0 mm | 79% |
| 17Thu | +22°C | +16°C | — | 6-7 m/s, NE | 0 mm | 83% |
| 18Fri | +22°C | +14°C | — | 5-6 m/s, ENE | 0 mm | 72% |
| 19Sat | +20°C | +16°C | — | 3 m/s, E | 5.1 mm | 91% |
| 20Sun | +20°C | +16°C | — | 3 m/s, WNW | 0 mm | 91% |
| 21Mon | +21°C | +16°C | — | 2-3 m/s, SE | 0 mm | 91% |
| 22Tue | +20°C | +15°C | — | 3-4 m/s, W | 0.1 mm | 86% |
| 23Wed | +18°C | +10°C | — | 5-6 m/s, SW | 0.1 mm | 85% |
| 24Thu | +13°C | +8°C | — | 7-9 m/s, WSW | 0.2 mm | 81% |
| 25Fri | +14°C | +9°C | — | 9-10 m/s, NW | 0.1 mm | 74% |
| 26Sat | +13°C | +8°C | — | 6-7 m/s, NNW | 0.4 mm | 72% |
| 27Sun | +14°C | +9°C | — | 7-9 m/s, NNW | 0 mm | 75% |
| 28Mon | +18°C | +8°C | — | 4-5 m/s, WNW | 0 mm | 81% |
| 29Tue | +16°C | +13°C | — | 3-4 m/s, NW | 0 mm | 86% |
| 30Wed | +17°C | +12°C | — | 6-9 m/s, SSW | 4.3 mm | 86% |
Weather highs and lows in Saint-Brieuc for september
- Warmest day: 14 september, +28°C
- Coldest night: 24 september, +8°C
- Max precipitation: 19 september, 5.1 mm
- Warmest water: —
- Coldest water: —
Climate in Saint-Brieuc in september
- Year: 2020
- Average daytime temperature: +19°C
- Average nighttime temperature: +13°C
- Water temperature: —
- Precipitation (month): 10.7 mm
- Days with precipitation: 2
- Humidity: 80%
- Wind: 4 m/s
Weather in Saint-Brieuc in september by year
| Year | Day | Night | Precipitation | Days with precipitation | Water |
|---|---|---|---|---|---|
| 2025 | +20°C | +12°C | 8.8 mm | 2 | — |
| 2024 | +18°C | +11°C | 11 mm | 3 | — |
| 2023 | +23°C | +14°C | 9.2 mm | 3 | — |
| 2022 | +20°C | +13°C | 12.8 mm | 5 | — |
| 2021 | +22°C | +13°C | 9.1 mm | 3 | — |
| 2020 | +19°C | +13°C | 10.7 mm | 2 | — |
Comparison september in Saint-Brieuc with other months
| Month | Day | Night | Days with precipitation | Sunny days |
|---|---|---|---|---|
| January | +9°C | +4°C | 5 | 4 |
| February | +10°C | +5°C | 4 | 4 |
| March | +11°C | +5°C | 3 | 7 |
| April | +13°C | +7°C | 3 | 8 |
| May | +16°C | +9°C | 2 | 8 |
| June | +20°C | +12°C | 4 | 9 |
| July | +22°C | +13°C | 3 | 10 |
| August | +23°C | +14°C | 2 | 12 |
| September | +20°C | +13°C | 3 | 7 |
| October | +17°C | +11°C | 4 | 8 |
| November | +13°C | +8°C | 4 | 4 |
| December | +10°C | +6°C | 6 | 4 |