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Weather & Climate in Mejillones, Chile
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Mejillones enjoys a temperate climate with an average annual temperature of 65°F (18°C). Winters average 72°F in January while summers reach 59°F in July / relatively mild seasonal variation. The area gets 336 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 0.2 inches (drier than the 38-inch national average). The city sits at an elevation of 43 feet.
Temperature
72°F Jan (22°C)
59°F Jul (15°C)
| Annual Average | 64.9°F |
| 20% above US avg | |
| January Average | 72°F (22°C) |
| July Average | 59°F (15°C) |
| Sunny Days | 336 days/yr |
Geography
| Elevation | 43 ft (13 m) |
| Area | 1,911.0 sq mi (4,949.6 km²) |
| Population Density | 7/sq mi |
| Coordinates | -23.1000°N, 70.4470°W |
| Timezone | America/Santiago |
Precipitation & Snow
Air Quality
Earthquake History
598 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M8.0.
| Jul 30, 1995 | 36 km NNE of Antofagasta, Chile | M8.0 | 31 km | 46 km |
| Jan 30, 1998 | 34 km SSE of Antofagasta, Chile | M7.1 | 94 km | 42 km |
| Apr 19, 1996 | 44 km SE of Antofagasta, Chile | M6.6 | 101 km | 50 km |
| Aug 3, 1995 | 68 km NNW of Antofagasta, Chile | M6.4 | 15 km | 17 km |
| Jan 8, 2000 | 60 km NNE of Antofagasta, Chile | M6.4 | 34 km | 36 km |
| Jul 30, 1995 | 40 km NNW of Antofagasta, Chile | M6.2 | 32 km | 14 km |
| Jul 28, 2022 | 22 km NW of Tocopilla, Chile | M6.1 | 131 km | 54 km |
| Jul 30, 1995 | 38 km SSE of Antofagasta, Chile | M6.0 | 100 km | 30 km |
| Mar 6, 2025 | 98 km S of Calama, Chile | M6.0 | 144 km | 96 km |
| Dec 10, 1994 | 23 km WNW of Antofagasta, Chile | M6.0 | 50 km | 37 km |
| Aug 2, 1995 | 54 km NNW of Antofagasta, Chile | M6.0 | 28 km | 33 km |
| Jan 23, 2004 | 84 km NE of Antofagasta, Chile | M5.9 | 57 km | 72 km |
| Jul 30, 1995 | 44 km N of Antofagasta, Chile | M5.9 | 22 km | 33 km |
| Jul 10, 1997 | 100 km SW of Tocopilla, Chile | M5.9 | 61 km | 33 km |
| Jul 3, 1996 | 30 km N of Antofagasta, Chile | M5.9 | 31 km | 33 km |
| Jul 30, 1995 | 84 km SSW of Antofagasta, Chile | M5.8 | 143 km | 11 km |
| Aug 2, 1995 | 30 km NW of Antofagasta, Chile | M5.8 | 39 km | 33 km |
| Aug 2, 1995 | 59 km N of Antofagasta, Chile | M5.8 | 5 km | 33 km |
| Jul 30, 1995 | 54 km NNW of Antofagasta, Chile | M5.8 | 28 km | 33 km |
| Jan 11, 2017 | 90 km SSE of Tocopilla, Chile | M5.8 | 73 km | 72 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tsunami History
3 tsunamis recorded within 500 km. Highest wave on record: 3.0 m (10 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1995 | NORTHERN CHILE | Earthquake | 3.0 m | 3 | 31 km |
| 2007 | NORTHERN CHILE | Earthquake | 0.3 m | 2 | 111 km |
| 1987 | NORTHERN CHILE | Earthquake | 0.2 m | 1 | 146 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 72°F (22°C) | 0.0 in | Warmest, Driest |
| February | 72°F (22°C) | 0.0 in | |
| March | 69°F (21°C) | 0.0 in | |
| April | 66°F (19°C) | 0.0 in | |
| May | 63°F (17°C) | 0.0 in | |
| June | 60°F (15°C) | 0.1 in | Wettest |
| July | 59°F (15°C) | 0.0 in | Coldest |
| August | 59°F (15°C) | 0.0 in | |
| September | 61°F (16°C) | 0.0 in | |
| October | 63°F (17°C) | 0.0 in | |
| November | 66°F (19°C) | 0.0 in | |
| December | 69°F (21°C) | 0.0 in |
Mejillones has a seasonal temperature swing of 13°F / from 59°F in July to 72°F in January. Total annual precipitation is 0.2 inches, with June being the wettest month (0.1") and January the driest (0.0").