Brest climate by month
What the weather is like
Brest has an oceanic climate (Köppen Cfb): rain spread through the year and no real dry season.
The warmest month is August, when afternoons average 21° and nights 14°. January is the coolest month, with highs of 10° and lows of 6°. The difference between the warmest and the coolest month is about 10°, a small seasonal swing typical of places tempered by the sea.
About 1,033 mm of precipitation falls in an average year. January is the wettest month (119 mm, 18 wet days) and September the driest (76 mm, 10 wet days). Cloud cover ranges from 35% in July to 49% in January.
The sea reaches about 16° in August. Sea temperatures lag the air by a month or two, so late summer is usually warmer for swimming than early summer.
Compared with Paris, the capital, Brest is 4.9° cooler on a August afternoon and receives more precipitation over the year.
Year in figures
- Hottest afternoons
- 21° · August
- Coldest nights
- 5° · February
- Wettest month
- January
- Driest month
- September
- Clearest skies
- July · 35% cloud
- Warmest sea
- 16° · August
- Longest day
- 16 h 05 min
- Shortest day
- 8 h 21 min
Twelve months at a glance
Temperature and precipitation
Daily high/low range bars, monthly precipitation columns, sea temperature lineTemperature curve
Average high, low and seaDaylight
Hours between sunrise and sunset on the 15th of each monthClimate normals month by month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Average high | 10° | 10° | 12° | 14° | 17° | 19° | 21° | 21° | 20° | 16° | 13° | 11° |
| Average low | 6° | 5° | 6° | 7° | 10° | 12° | 14° | 14° | 12° | 10° | 8° | 6° |
| Precipitation | 119 mm | 91 mm | 84 mm | 76 mm | 70 mm | 51 mm | 58 mm | 56 mm | 76 mm | 111 mm | 113 mm | 128 mm |
| Wet days (≥1 mm) | 18.3 | 14.8 | 14.3 | 10.6 | 11.3 | 10.2 | 11.9 | 11.8 | 9.5 | 15 | 16.9 | 17.1 |
| Cloud cover | 49% | 46% | 46% | 39% | 38% | 36% | 35% | 35% | 36% | 42% | 45% | 47% |
| Sea temperature | 11° | 10° | 10° | 11° | 13° | 14° | 15° | 16° | 15° | 15° | 14° | 12° |
| Daylight | 8h 45 | 10h 13 | 11h 50 | 13h 39 | 15h 12 | 16h 05 | 15h 43 | 14h 22 | 12h 38 | 10h 53 | 9h 15 | 8h 21 |
| Month score | 18 | 20 | 29 | 50 | 64 | 73 | 70 | 70 | 75 | 53 | 35 | 22 |