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Monthly climate in Saint Peter Port, Guernsey

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Saint Peter Port features a oceanic climate (Cfb). Temperatures typically range between 9 °C (48 °F) and 17 °C (63 °F) through the year, but rarely can drop to 0 °C (32 °F) or can rise to as high as 22 °C (72 °F). The average annual precipitation amounts to about 983 mm (38.7 inches) and receives 150 rainy days on the 1 mm (0.04 inches) threshold annually. Saint Peter Port enjoys an average of 3448 hours of sunshine throughout the year, and daylight varies from 8 hours 13 minutes to 16 hours 10 minutes per day.

Monthly average temperatures in Saint Peter Port, Guernsey

The warmest months in Saint Peter Port are July, August and September, with daily mean temperatures ranging from 16 to 17 °C (62 - 63 °F) throughout the day. The coldest temperatures usually occur in January, February and March, when daily mean temperatures range from 9 to 9 °C (48 - 49 °F) throughout the day. On average each year, Saint Peter Port 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 Saint Peter Port. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum14°C
(57°F)		13°C
(56°F)		13°C
(55°F)		15°C
(59°F)		18°C
(65°F)		19°C
(67°F)		21°C
(70°F)		22°C
(72°F)		21°C
(71°F)		20°C
(68°F)		17°C
(63°F)		14°C
(58°F)
Mean maximum13°C
(55°F)		12°C
(54°F)		12°C
(54°F)		14°C
(57°F)		16°C
(61°F)		17°C
(63°F)		20°C
(68°F)		20°C
(68°F)		20°C
(69°F)		19°C
(66°F)		16°C
(61°F)		14°C
(57°F)
Average high10°C
(50°F)		10°C
(50°F)		10°C
(50°F)		11°C
(52°F)		13°C
(55°F)		15°C
(59°F)		17°C
(63°F)		18°C
(64°F)		17°C
(64°F)		16°C
(61°F)		13°C
(56°F)		11°C
(53°F)
Daily mean9°C
(49°F)		9°C
(48°F)		9°C
(49°F)		10°C
(50°F)		12°C
(54°F)		14°C
(58°F)		16°C
(62°F)		17°C
(63°F)		17°C
(62°F)		15°C
(59°F)		12°C
(54°F)		11°C
(51°F)
Average low8°C
(47°F)		8°C
(47°F)		8°C
(47°F)		9°C
(49°F)		11°C
(53°F)		14°C
(57°F)		16°C
(61°F)		16°C
(62°F)		16°C
(61°F)		14°C
(57°F)		11°C
(53°F)		10°C
(49°F)
Mean minimum5°C
(41°F)		4°C
(39°F)		5°C
(41°F)		6°C
(43°F)		8°C
(47°F)		12°C
(54°F)		14°C
(58°F)		15°C
(58°F)		13°C
(56°F)		11°C
(52°F)		8°C
(46°F)		6°C
(43°F)
Minimum3°C
(37°F)		0°C
(33°F)		-0°C
(32°F)		5°C
(41°F)		7°C
(45°F)		11°C
(53°F)		14°C
(57°F)		14°C
(57°F)		12°C
(54°F)		9°C
(48°F)		6°C
(43°F)		5°C
(41°F)

Compare climate in Saint Peter Port with other places

Compare temperature, precipitation, sunshine, UV index in Saint Peter Port, Guernsey with other places around the world.

Monthly average precipitation in Saint Peter Port, Guernsey

Saint Peter Port usually has the most precipitation in October, November and December, with an average of 18 rainy days and 144 mm (5.7 inches) of precipitation per month. The driest months in Saint Peter Port are April, July and August. On average, 40 mm (1.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Saint Peter Port. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)94 (3.7)86 (3.4)73 (2.9)34 (1.3)55 (2.2)59 (2.3)37 (1.5)50 (2.0)63 (2.5)144 (5.7)126 (5.0)163 (6.4)
Average precipitation days (≥ 1 mm)141615888799171821

Monthly sunshine hours in Saint Peter Port, Guernsey

The sunniest months in Saint Peter Port are May, June and July, when the sun shines an average of 13 hours 46 minutes a day. Least sunny months in Saint Peter Port: January, February and December receive an average of 4 hours 23 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Saint Peter Port. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours106163238359414415436396338269180130
Mean daily daylight hours8h 41m10h 7m11h 55m13h 46m15h 21m16h 10m15h 44m14h 19m12h 32m10h 43m9h 5m8h 13m

Solar UV radiation in Saint Peter Port, Guernsey

Saint Peter Port experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 7 - 9, which corresponds to the High / 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 Saint Peter Port UV Index data.

Average daily maximum UV levels by month for Saint Peter Port. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)234679876421