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Monthly climate in Treffiagat, France

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Treffiagat features a oceanic climate (Cfb). Temperatures typically range between 9 °C (48 °F) and 18 °C (65 °F) through the year, but rarely can drop to -2 °C (28 °F) or can rise to as high as 24 °C (76 °F). The average annual precipitation amounts to about 862 mm (33.9 inches) and receives 146 rainy days on the 1 mm (0.04 inches) threshold annually. Treffiagat enjoys an average of 3669 hours of sunshine throughout the year, and daylight varies from 8 hours 27 minutes to 15 hours 56 minutes per day.

Monthly average temperatures in Treffiagat, France

The warmest months in Treffiagat are July, August and September, with daily mean temperatures ranging from 17 to 18 °C (62 - 65 °F) throughout the day. The coldest temperatures usually occur in January, February and March, when daily mean temperatures range from 9 to 10 °C (48 - 50 °F) throughout the day. On average each year, Treffiagat experiences 0 days above 25 °C (77.0 °F) and 0 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Treffiagat. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum14°C
(57°F)		14°C
(57°F)		16°C
(60°F)		18°C
(65°F)		22°C
(71°F)		24°C
(76°F)		24°C
(76°F)		23°C
(74°F)		24°C
(75°F)		19°C
(67°F)		17°C
(62°F)		14°C
(58°F)
Mean maximum13°C
(56°F)		13°C
(56°F)		14°C
(57°F)		17°C
(62°F)		19°C
(67°F)		22°C
(71°F)		24°C
(75°F)		22°C
(72°F)		21°C
(71°F)		18°C
(65°F)		16°C
(61°F)		14°C
(57°F)
Average high10°C
(50°F)		10°C
(51°F)		11°C
(52°F)		13°C
(55°F)		15°C
(59°F)		17°C
(64°F)		19°C
(67°F)		19°C
(66°F)		18°C
(65°F)		15°C
(60°F)		13°C
(55°F)		12°C
(53°F)
Daily mean9°C
(48°F)		9°C
(49°F)		10°C
(50°F)		11°C
(52°F)		13°C
(57°F)		16°C
(62°F)		18°C
(65°F)		18°C
(64°F)		17°C
(62°F)		14°C
(58°F)		12°C
(53°F)		11°C
(51°F)
Average low8°C
(46°F)		8°C
(47°F)		8°C
(48°F)		10°C
(50°F)		12°C
(54°F)		15°C
(59°F)		17°C
(62°F)		16°C
(62°F)		15°C
(60°F)		13°C
(56°F)		11°C
(51°F)		9°C
(49°F)
Mean minimum4°C
(39°F)		4°C
(39°F)		4°C
(40°F)		6°C
(42°F)		9°C
(48°F)		12°C
(55°F)		14°C
(58°F)		14°C
(57°F)		12°C
(55°F)		10°C
(50°F)		7°C
(44°F)		6°C
(42°F)
Minimum1°C
(33°F)		-1°C
(31°F)		-2°C
(28°F)		4°C
(40°F)		7°C
(46°F)		11°C
(52°F)		13°C
(56°F)		13°C
(55°F)		11°C
(53°F)		7°C
(45°F)		5°C
(41°F)		5°C
(41°F)

Compare climate in Treffiagat with other places

Compare temperature, precipitation, sunshine, UV index in Treffiagat, France with other places around the world.

Monthly average precipitation in Treffiagat, France

Treffiagat usually has the most precipitation in October, November and December, with an average of 16 rainy days and 113 mm (4.5 inches) of precipitation per month. The driest months in Treffiagat are April, July and September. On average, 43 mm (1.7 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Treffiagat. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)68 (2.7)93 (3.6)71 (2.8)36 (1.4)56 (2.2)53 (2.1)42 (1.6)52 (2.1)50 (2.0)96 (3.8)106 (4.2)138 (5.4)
Average precipitation days (≥ 1 mm)131414711119109131718

Monthly sunshine hours in Treffiagat, France

The sunniest months in Treffiagat are May, June and July, when the sun shines an average of 13 hours 34 minutes a day. Least sunny months in Treffiagat: January, February and December receive an average of 5 hours 43 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Treffiagat. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours139205302354413408426398337278227175
Mean daily daylight hours8h 52m10h 14m11h 56m13h 40m15h 10m15h 56m15h 31m14h 11m12h 31m10h 47m9h 15m8h 27m

Solar UV radiation in Treffiagat, France

Treffiagat experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 8 - 9, which corresponds to the Very High category of sun exposure. January, November and December are in the Low exposure category. In these months, the maximum values of the UV index do not exceed 2. For more detailed information, check out our hourly Treffiagat UV Index data.

Average daily maximum UV levels by month for Treffiagat. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)235689986522