nomadseason

Monthly climate in St Martin, Guernsey

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification St Martin 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.St Martin 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 St Martin, Guernsey §

The warmest months in St Martin 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, St Martin 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 St Martin, Guernsey.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 14°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 maximum 13°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 high 10°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 mean 9°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 low 8°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 minimum 5°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)
Minimum 3°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 St Martin with other places

Compare temperature, precipitation, sunshine, UV index in St Martin, Guernsey with other places around the world.

Monthly average precipitation in St Martin, Guernsey §

St Martin 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 St Martin 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 St Martin, Guernsey.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
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) 14 16 15 8 8 8 7 9 9 17 18 21

Monthly sunshine hours in St Martin, Guernsey §

The sunniest months in St Martin are May, June and July, when the sun shines an average of 13 hours 46 minutes a day.Least sunny months in St Martin: 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 St Martin, Guernsey.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 106 163 238 359 414 415 436 396 338 269 180 130
Mean daily daylight hours 8h 41m 10h 7m 11h 55m 13h 46m 15h 21m 16h 10m 15h 44m 14h 19m 12h 32m 10h 43m 9h 5m 8h 13m

Solar UV radiation in St Martin, Guernsey §

St Martin 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 St Martin UV Index data.

Average daily maximum UV levels by month for St Martin, Guernsey.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 2 3 4 6 7 9 8 7 6 4 2 1