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Weather & Climate in Saint-Jean-d'Illac, France
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Saint-Jean-d'Illac experiences four distinct seasons with an average annual temperature of 55°F (13°C). Winters average 43°F in January while summers reach 68°F in July. The area gets 270 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 36.2 inches. The city sits at an elevation of 148 feet.
Temperature
43°F Jan (6°C)
68°F Jul (20°C)
| Annual Average | 54.8°F |
| 1% above US avg | |
| January Average | 43°F (6°C) |
| July Average | 68°F (20°C) |
| Sunny Days | 270 days/yr |
Geography
| Elevation | 148 ft (45 m) |
| Area | 46.6 sq mi (120.6 km²) |
| Population Density | 147/sq mi |
| Coordinates | 44.8098°N, 0.7839°W |
| Timezone | Europe/Paris |
Precipitation & Snow
Air Quality
Earthquake History
138 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.2.
| Apr 18, 2005 | 1 km SSW of Saint-Pierre-d'Oléron, France | M5.2 | 131 km | 10 km |
| Mar 20, 2019 | 5 km NNE of Montendre, France | M4.5 | 66 km | 10 km |
| Apr 4, 2005 | 9 km WSW of Saint-Pierre-d'Oléron, France | M4.2 | 133 km | 10 km |
| Jun 25, 2001 | 10 km WSW of Saint-Pierre-d'Oléron, France | M4.2 | 131 km | 2 km |
| Sep 28, 2010 | 9 km W of Saint-Pierre-d'Oléron, France | M4.2 | 137 km | 2 km |
| Dec 4, 1997 | 8 km SE of Amou, France | M4.1 | 141 km | 5 km |
| Oct 31, 1990 | 6 km ENE of Arthez-de-Béarn, France | M4.1 | 148 km | 10 km |
| Jun 20, 1992 | 10 km S of Hagetmau, France | M4.1 | 140 km | 10 km |
| Feb 23, 2000 | 5 km SW of Mareuil, France | M4.1 | 115 km | 10 km |
| Jul 30, 1992 | 4 km N of Arthez-de-Béarn, France | M4.0 | 145 km | 13 km |
| Dec 1, 1996 | 5 km SSW of Aigre, France | M3.9 | 130 km | 5 km |
| Apr 28, 2016 | 6 km WSW of Châtelaillon-Plage, France | M3.9 | 140 km | 10 km |
| Jan 14, 1996 | 7 km N of Arthez-de-Béarn, France | M3.9 | 143 km | 10 km |
| Jan 17, 1996 | 7 km NNW of Arthez-de-Béarn, France | M3.9 | 143 km | 10 km |
| Jan 14, 1996 | 5 km NNE of Arthez-de-Béarn, France | M3.9 | 145 km | 10 km |
| Jan 14, 1996 | 4 km NE of Arthez-de-Béarn, France | M3.7 | 147 km | 10 km |
| Apr 4, 2005 | 7 km W of Saint-Pierre-d'Oléron, France | M3.7 | 135 km | 10 km |
| Jun 7, 1993 | 10 km ESE of Amou, France | M3.6 | 139 km | 10 km |
| Feb 3, 1992 | 4 km NW of Arthez-de-Béarn, France | M3.6 | 146 km | 10 km |
| Nov 10, 1990 | 7 km NNE of Arthez-de-Béarn, France | M3.5 | 144 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 43°F (6°C) | 3.5 in | Coldest |
| February | 45°F (7°C) | 3.2 in | |
| March | 48°F (9°C) | 2.6 in | |
| April | 52°F (11°C) | 2.9 in | |
| May | 59°F (15°C) | 3.0 in | |
| June | 64°F (18°C) | 2.4 in | |
| July | 68°F (20°C) | 1.9 in | Warmest, Driest |
| August | 68°F (20°C) | 2.2 in | |
| September | 63°F (17°C) | 3.2 in | |
| October | 56°F (14°C) | 3.5 in | |
| November | 48°F (9°C) | 4.1 in | Wettest |
| December | 44°F (7°C) | 3.9 in |
Saint-Jean-d'Illac has a seasonal temperature swing of 25°F / from 43°F in January to 68°F in July. Total annual precipitation is 36.2 inches, with November being the wettest month (4.1") and July the driest (1.9").