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Weather & Climate in Oued Sly, Algeria
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Oued Sly enjoys a temperate climate with an average annual temperature of 65°F (18°C). Winters average 50°F in January while summers reach 83°F in July. The area gets 307 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 15.8 inches (drier than the 38-inch national average). The city sits at an elevation of 295 feet.
Temperature
50°F Jan (10°C)
83°F Jul (28°C)
| Annual Average | 64.9°F |
| 20% above US avg | |
| January Average | 50°F (10°C) |
| July Average | 83°F (28°C) |
| Sunny Days | 307 days/yr |
Geography
| Elevation | 295 ft (90 m) |
| Area | 51.8 sq mi (134.1 km²) |
| Population Density | 589/sq mi |
| Coordinates | 36.1012°N, 1.1995°W |
| Timezone | Africa/Algiers |
Precipitation & Snow
Air Quality
Earthquake History
232 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.9.
| Aug 18, 1994 | 8 km E of Sig, Algeria | M5.9 | 134 km | 9 km |
| Feb 9, 1990 | 20 km N of Tipasa, Algeria | M5.2 | 137 km | 12 km |
| Jul 20, 2005 | 68 km NW of Abou el Hassan, Algeria | M5.0 | 98 km | 10 km |
| Jan 17, 2009 | 10 km NNW of El Abadia, Algeria | M4.8 | 47 km | 10 km |
| May 22, 2014 | 21 km SE of Mostaganem, Algeria | M4.8 | 93 km | 10 km |
| Jan 19, 1992 | 8 km E of El Abadia, Algeria | M4.7 | 56 km | 12 km |
| Jan 2, 2018 | 11 km SW of El Affroun, Algeria | M4.7 | 125 km | 8 km |
| Apr 23, 2018 | 10 km NNW of Mostaganem, Algeria | M4.7 | 104 km | 8 km |
| Jul 14, 1997 | 9 km NNE of Ammi Moussa, Algeria | M4.7 | 18 km | 10 km |
| Apr 12, 1990 | 20 km NNE of Tipasa, Algeria | M4.7 | 137 km | 14 km |
| Jun 18, 2008 | 9 km NE of ’Aïn Merane, Algeria | M4.6 | 19 km | 6 km |
| Feb 14, 2024 | 23 km N of Mascara, Algeria | M4.6 | 113 km | 10 km |
| Jun 26, 2022 | 14 km NW of Aïn el Bya, Algeria | M4.6 | 145 km | 10 km |
| Apr 25, 2012 | 25 km N of El Abadia, Algeria | M4.6 | 59 km | 10 km |
| Mar 11, 1990 | 11 km SW of Bou Ismaïl, Algeria | M4.6 | 135 km | 33 km |
| Jan 8, 2018 | 6 km ESE of Hadjout, Algeria | M4.5 | 124 km | 10 km |
| Jul 23, 2006 | 11 km NNE of Relizane, Algeria | M4.5 | 61 km | 22 km |
| Dec 10, 1998 | 11 km SE of Sig, Algeria | M4.5 | 137 km | 10 km |
| Aug 18, 1994 | 7 km E of Sig, Algeria | M4.5 | 134 km | 10 km |
| Jul 23, 2006 | 7 km ENE of Relizane, Algeria | M4.4 | 64 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tsunami History
3 tsunamis recorded within 500 km. Highest wave on record: 0.7 m (2 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1980 | EL ASNAM | Eruption + Earthquake | 0.7 m | 5,000 | 19 km |
| 1954 | SEA OF ALBORAN | Eruption + Earthquake | 0.3 m | 1,243 | 40 km |
| 1891 | SEA OF ALBORAN | Earthquake | — | 36 | 70 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 50°F (10°C) | 2.0 in | Coldest |
| February | 52°F (11°C) | 1.9 in | |
| March | 55°F (13°C) | 1.8 in | |
| April | 60°F (16°C) | 1.5 in | |
| May | 67°F (20°C) | 1.3 in | |
| June | 76°F (24°C) | 0.4 in | |
| July | 83°F (28°C) | 0.1 in | Driest |
| August | 83°F (29°C) | 0.1 in | Warmest |
| September | 77°F (25°C) | 0.8 in | |
| October | 67°F (19°C) | 1.6 in | |
| November | 58°F (14°C) | 2.3 in | Wettest |
| December | 51°F (11°C) | 2.2 in |
Oued Sly has a seasonal temperature swing of 34°F / from 50°F in January to 83°F in August. Total annual precipitation is 15.7 inches, with November being the wettest month (2.3") and July the driest (0.1").