Brest, Brittany climate

Cfb Oceanic / temperate

Brest has a mildly seasonal cool-temperate climate (Oceanic / temperate, Köppen Cfb). The hottest month is August with an average daily high near 70°F, while the coldest is January averaging around 39°F at night. Around 45 inches of precipitation falls each year, peaking in December (5.6 inches) and easing off in June (2.4 inches).

☀️ Summers

Mild

Highs near 70°F in August.

❄️ Winters

Chilly

Lows near 39°F in January.

🌧️ Rain

Wet

About 45 in of rain a year.

Wettest in December

⛅ Sky & trend

Often grey

Overcast skies dominate much of the year.

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Hours of sunshine per day

Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)

Brest climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	50	50	54	57	63	67	70	70	67	61	55	51
Avg temp (°F)	45	45	47	50	55	59	62	62	59	55	49	46
Avg low (°F)	39	39	41	43	47	52	55	55	52	48	44	40
Precipitation (in)	5.2	4.3	3.1	3.2	2.9	2.4	2.6	2.9	2.6	4.8	5.4	5.6

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	50	50	54	57	63	67
Avg temp (°F)	45	45	47	50	55	59
Avg low (°F)	39	39	41	43	47	52
Precipitation (in)	5.2	4.3	3.1	3.2	2.9	2.4

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	70	70	67	61	55	51
Avg temp (°F)	62	62	59	55	49	46
Avg low (°F)	55	55	52	48	44	40
Precipitation (in)	2.6	2.9	2.6	4.8	5.4	5.6

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	83	81	77	70	70	68	68	71	69	75	80	81
Relative humidity (%)	88	87	86	84	83	83	82	81	82	85	87	88
Wind speed (mph)	12.5	12.1	11.3	10.5	9.7	9.0	8.7	8.5	9.2	10.7	11.7	12.5

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	83	81	77	70	70	68
Relative humidity (%)	88	87	86	84	83	83
Wind speed (mph)	12.5	12.1	11.3	10.5	9.7	9.0

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	68	71	69	75	80	81
Relative humidity (%)	82	81	82	85	87	88
Wind speed (mph)	8.7	8.5	9.2	10.7	11.7	12.5

Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Guipavas / Brest Bretagne, a weather station, about 8 km from the city centre. The underlying daily records come from NOAA's global station network.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →