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Weather & Climate in Saint Helier, Jersey
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Saint Helier experiences four distinct seasons with an average annual temperature of 53°F (12°C). Winters average 44°F in January while summers reach 63°F in July / relatively mild seasonal variation. The area gets 276 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 33.4 inches. The city sits at an elevation of 36 feet.
Temperature
44°F Jan (7°C)
63°F Jul (17°C)
| Annual Average | 52.7°F |
| 2% below US avg | |
| January Average | 44°F (7°C) |
| July Average | 63°F (17°C) |
| Sunny Days | 276 days/yr |
Geography
| Elevation | 36 ft (11 m) |
| Area | 4.1 sq mi (10.6 km²) |
| Population Density | 6,846/sq mi |
| Coordinates | 49.1880°N, 2.1049°W |
| Timezone | Europe/Jersey |
Precipitation & Snow
Air Quality
Earthquake History
20 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.2.
| Apr 30, 1990 | 5 km SE of Saint Helier, Jersey | M4.2 | 6 km | 22 km |
| Nov 30, 1994 | 17 km N of Courseulles-sur-Mer, France | M4.1 | 125 km | 6 km |
| Jul 11, 2014 | 23 km W of Saint Helier, Jersey | M3.9 | 23 km | 12 km |
| Jul 14, 2011 | 62 km SSE of Ventnor, United Kingdom | M3.9 | 143 km | 10 km |
| Jul 11, 2002 | 3 km NW of Pluduno, France | M3.8 | 73 km | 10 km |
| Nov 2, 1997 | 7 km NW of Villers-sur-Mer, France | M3.7 | 149 km | 10 km |
| Feb 25, 2015 | 30 km SW of Saint Helier, Jersey | M3.7 | 30 km | 2 km |
| Sep 23, 2003 | 41 km WNW of Étretat, France | M3.6 | 148 km | 10 km |
| Apr 22, 1995 | 6 km E of Binic, France | M3.5 | 80 km | 10 km |
| Jul 26, 1993 | 5 km ESE of Villedieu-les-Poêles, France | M3.5 | 81 km | 31 km |
| Aug 8, 1998 | 1 km SE of Cairon, France | M3.5 | 121 km | 10 km |
| Dec 7, 1998 | 0 km SE of Cherrueix, France | M3.4 | 72 km | 2 km |
| Sep 17, 1994 | 33 km NE of Plouézec, France | M3.4 | 48 km | 10 km |
| Jun 22, 1997 | 13 km SSE of Saint Helier, Jersey | M3.4 | 14 km | 10 km |
| Aug 29, 2001 | 5 km ENE of Saint-Lô, France | M3.3 | 79 km | 6 km |
| Jul 23, 2014 | France | M3.3 | 28 km | 2 km |
| Dec 5, 2000 | 2 km W of Guillac, France | M3.3 | 145 km | 3 km |
| Sep 22, 1991 | 5 km ENE of Neulliac, France | M3.3 | 131 km | 10 km |
| Jul 14, 1998 | 7 km NNE of Poullaouen, France | M3.2 | 140 km | 2 km |
| Feb 12, 1990 | 1 km N of Lanmeur, France | M3.2 | 131 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 44°F (7°C) | 3.9 in | |
| February | 44°F (6°C) | 3.0 in | Coldest |
| March | 46°F (8°C) | 2.8 in | |
| April | 49°F (9°C) | 2.0 in | |
| May | 54°F (12°C) | 2.0 in | |
| June | 59°F (15°C) | 1.9 in | |
| July | 63°F (17°C) | 1.5 in | Driest |
| August | 64°F (18°C) | 1.8 in | Warmest |
| September | 60°F (16°C) | 2.7 in | |
| October | 55°F (13°C) | 3.5 in | |
| November | 49°F (10°C) | 4.2 in | Wettest |
| December | 46°F (8°C) | 4.1 in |
Saint Helier has a seasonal temperature swing of 20°F / from 44°F in February to 64°F in August. Total annual precipitation is 33.4 inches, with November being the wettest month (4.2") and July the driest (1.5").