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Monthly climate in Saint Helier, Jersey

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Saint Helier features a oceanic climate (Cfb).Temperatures typically range between 8 °C (47 °F) and 18 °C (64 °F) through the year, but rarely can drop to -2 °C (29 °F) or can rise to as high as 27 °C (80 °F).The average annual precipitation amounts to about 1103 mm (43.4 inches) and receives 165 rainy days on the 1 mm (0.04 inches) threshold annually.Saint Helier enjoys an average of 3427 hours of sunshine throughout the year, and daylight varies from 8 hours 15 minutes to 16 hours 8 minutes per day.

Monthly average temperatures in Saint Helier, Jersey §

The warmest months in Saint Helier are July, August and September, with daily mean temperatures ranging from 17 to 18 °C (63 - 64 °F) throughout the day. The coldest temperatures usually occur in January, February and March, when daily mean temperatures range from 8 to 9 °C (47 - 48 °F) throughout the day. On average each year, Saint Helier 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 Helier, Jersey.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 13°C
(56°F)		 13°C
(56°F)		 14°C
(58°F)		 17°C
(62°F)		 20°C
(69°F)		 24°C
(76°F)		 27°C
(80°F)		 25°C
(78°F)		 23°C
(75°F)		 20°C
(69°F)		 17°C
(62°F)		 14°C
(57°F)
Mean maximum 12°C
(54°F)		 12°C
(54°F)		 13°C
(55°F)		 16°C
(60°F)		 18°C
(65°F)		 20°C
(69°F)		 24°C
(75°F)		 22°C
(73°F)		 22°C
(71°F)		 19°C
(66°F)		 16°C
(60°F)		 13°C
(56°F)
Average high 9°C
(49°F)		 9°C
(49°F)		 10°C
(50°F)		 12°C
(53°F)		 14°C
(57°F)		 16°C
(62°F)		 18°C
(65°F)		 19°C
(66°F)		 18°C
(65°F)		 16°C
(61°F)		 13°C
(55°F)		 11°C
(52°F)
Daily mean 8°C
(47°F)		 8°C
(47°F)		 9°C
(48°F)		 10°C
(51°F)		 13°C
(55°F)		 15°C
(60°F)		 17°C
(63°F)		 18°C
(64°F)		 17°C
(63°F)		 15°C
(59°F)		 12°C
(53°F)		 10°C
(50°F)
Average low 7°C
(45°F)		 7°C
(45°F)		 8°C
(47°F)		 9°C
(49°F)		 12°C
(53°F)		 14°C
(58°F)		 17°C
(62°F)		 17°C
(63°F)		 16°C
(61°F)		 14°C
(57°F)		 11°C
(51°F)		 9°C
(48°F)
Mean minimum 4°C
(40°F)		 3°C
(37°F)		 4°C
(39°F)		 6°C
(43°F)		 9°C
(48°F)		 12°C
(55°F)		 15°C
(59°F)		 15°C
(59°F)		 13°C
(56°F)		 11°C
(52°F)		 7°C
(45°F)		 5°C
(41°F)
Minimum 2°C
(35°F)		 -1°C
(31°F)		 -2°C
(29°F)		 5°C
(41°F)		 7°C
(46°F)		 11°C
(53°F)		 14°C
(58°F)		 14°C
(57°F)		 12°C
(54°F)		 9°C
(48°F)		 5°C
(41°F)		 3°C
(38°F)

Compare climate in Saint Helier with other places

Compare temperature, precipitation, sunshine, UV index in Saint Helier, Jersey with other places around the world.

Monthly average precipitation in Saint Helier, Jersey §

Saint Helier usually has the most precipitation in October, November and December, with an average of 19 rainy days and 156 mm (6.1 inches) of precipitation per month.The driest months in Saint Helier are April, May and July. On average, 49 mm (1.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Saint Helier, Jersey.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) 97 (3.8) 90 (3.5) 84 (3.3) 36 (1.4) 63 (2.5) 71 (2.8) 47 (1.9) 66 (2.6) 82 (3.2) 157 (6.2) 125 (4.9) 185 (7.3)
Average precipitation days (≥ 1 mm) 14 16 15 8 10 10 9 13 11 19 18 22

Monthly sunshine hours in Saint Helier, Jersey §

The sunniest months in Saint Helier are May, June and July, when the sun shines an average of 13 hours 35 minutes a day.Least sunny months in Saint Helier: January, February and December receive an average of 4 hours 24 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Saint Helier, Jersey.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 103 165 238 356 411 407 431 391 333 269 184 132
Mean daily daylight hours 8h 42m 10h 8m 11h 55m 13h 45m 15h 19m 16h 8m 15h 42m 14h 18m 12h 32m 10h 43m 9h 6m 8h 15m

Solar UV radiation in Saint Helier, Jersey §

Saint Helier 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 Saint Helier UV Index data.

Average daily maximum UV levels by month for Saint Helier, Jersey.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 9 8 6 4 2 1