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Weather & Climate in Saint-Cast-le-Guildo, France
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Saint-Cast-le-Guildo experiences four distinct seasons with an average annual temperature of 55°F (13°C). Winters average 45°F in January while summers reach 64°F in July / relatively mild seasonal variation. The area gets 239 sunny days per year, above the national average. Annual precipitation totals 34.8 inches. The area receives 1.9 inches of snow annually. The city sits at an elevation of 89 feet.
Temperature
45°F Jan (7°C)
64°F Jul (18°C)
| Annual Average | 54.8°F |
| 1% above US avg | |
| January Average | 45°F (7°C) |
| July Average | 64°F (18°C) |
| Sunny Days | 239 days/yr |
Geography
| Elevation | 89 ft (27 m) |
| Area | 8.7 sq mi (22.6 km²) |
| Population Density | 385/sq mi |
| Coordinates | 48.6304°N, 2.2589°W |
| Timezone | Europe/Paris |
Precipitation & Snow
Air Quality
Earthquake History
192 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.6.
| Mar 13, 1993 | 1 km WSW of Pénestin, France | M4.6 | 130 km | 10 km |
| Nov 21, 2013 | 1 km WSW of Plescop, France | M4.5 | 113 km | 4 km |
| Sep 30, 2002 | 3 km W of Languidic, France | M4.2 | 113 km | 10 km |
| Apr 30, 1990 | 5 km SE of Saint Helier, Jersey | M4.2 | 60 km | 22 km |
| Sep 30, 2002 | 1 km E of Languidic, France | M4.1 | 110 km | 4 km |
| Jul 11, 2014 | 23 km W of Saint Helier, Jersey | M3.9 | 59 km | 12 km |
| Oct 11, 1995 | 1 km SSE of Querrien, France | M3.9 | 121 km | 10 km |
| Jul 18, 2004 | 6 km WSW of Groix, France | M3.8 | 148 km | 16 km |
| Apr 23, 2002 | 1 km ESE of Melgven, France | M3.8 | 140 km | 6 km |
| Jul 11, 2002 | 3 km NW of Pluduno, France | M3.8 | 10 km | 10 km |
| Jun 24, 1995 | 1 km SE of Andouillé, France | M3.7 | 122 km | 5 km |
| Feb 25, 2015 | 30 km SW of Saint Helier, Jersey | M3.7 | 42 km | 2 km |
| Sep 28, 2017 | 1 km WNW of Tresbœuf, France | M3.6 | 98 km | 2 km |
| Jul 26, 1993 | 5 km ESE of Villedieu-les-Poêles, France | M3.5 | 83 km | 31 km |
| Aug 8, 1998 | 1 km SE of Cairon, France | M3.5 | 149 km | 10 km |
| May 14, 1994 | 0 km SE of Riec-sur-Belon, France | M3.5 | 139 km | 10 km |
| Apr 22, 1995 | 6 km E of Binic, France | M3.5 | 35 km | 10 km |
| Dec 7, 1998 | 0 km SE of Cherrueix, France | M3.4 | 41 km | 2 km |
| Sep 17, 1994 | 33 km NE of Plouézec, France | M3.4 | 42 km | 10 km |
| Jun 22, 1997 | 13 km SSE of Saint Helier, Jersey | M3.4 | 53 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 45°F (7°C) | 3.4 in | |
| February | 44°F (7°C) | 2.8 in | Coldest |
| March | 47°F (8°C) | 2.6 in | |
| April | 50°F (10°C) | 2.2 in | |
| May | 56°F (13°C) | 2.3 in | |
| June | 60°F (16°C) | 1.9 in | |
| July | 64°F (18°C) | 1.7 in | Driest |
| August | 64°F (18°C) | 1.8 in | Warmest |
| September | 61°F (16°C) | 2.5 in | |
| October | 55°F (13°C) | 3.3 in | |
| November | 49°F (9°C) | 3.8 in | Wettest |
| December | 45°F (7°C) | 3.5 in |
Saint-Cast-le-Guildo has a seasonal temperature swing of 21°F / from 44°F in February to 64°F in August. Total annual precipitation is 31.7 inches, with November being the wettest month (3.8") and July the driest (1.7").