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Weather & Climate in Unión, Argentina
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Unión enjoys a temperate climate with an average annual temperature of 61°F (16°C). Winters average 76°F in January while summers reach 45°F in July / relatively mild seasonal variation. The area gets 303 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 18.2 inches (drier than the 38-inch national average). The city sits at an elevation of 1,217 feet.
Temperature
76°F Jan (25°C)
45°F Jul (7°C)
| Annual Average | 61.0°F |
| 13% above US avg | |
| January Average | 76°F (25°C) |
| July Average | 45°F (7°C) |
| Sunny Days | 303 days/yr |
Geography
| Elevation | 1,217 ft (371 m) |
| Area | 447.9 sq mi (1,160.0 km²) |
| Population Density | 5/sq mi |
| Coordinates | -35.1538°N, 65.9462°W |
| Timezone | America/Argentina/San_Luis |
Precipitation & Snow
Air Quality
Earthquake History
6 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.7.
| Jul 17, 2013 | 118 km NW of Unión, Argentina | M4.7 | 119 km | 12 km |
| Apr 1, 1990 | 102 km ESE of San Rafael, Argentina | M4.5 | 125 km | 29 km |
| May 7, 2004 | 110 km NNW of Santa Isabel, Argentina | M4.4 | 137 km | 10 km |
| Jan 21, 2004 | 109 km SE of San Rafael, Argentina | M4.3 | 138 km | 10 km |
| Jul 13, 2013 | 109 km NW of Unión, Argentina | M4.2 | 110 km | 11 km |
| Jan 16, 2015 | 50 km NW of Unión, Argentina | M3.9 | 51 km | 12 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 76°F (25°C) | 2.5 in | Warmest |
| February | 73°F (23°C) | 2.4 in | |
| March | 68°F (20°C) | 2.1 in | |
| April | 61°F (16°C) | 1.3 in | |
| May | 53°F (11°C) | 0.8 in | |
| June | 46°F (8°C) | 0.4 in | Driest |
| July | 45°F (7°C) | 0.5 in | Coldest |
| August | 49°F (10°C) | 0.5 in | |
| September | 55°F (13°C) | 0.9 in | |
| October | 63°F (17°C) | 2.0 in | |
| November | 69°F (21°C) | 2.0 in | |
| December | 75°F (24°C) | 2.8 in | Wettest |
Unión has a seasonal temperature swing of 31°F / from 45°F in July to 76°F in January. Total annual precipitation is 18.2 inches, with December being the wettest month (2.8") and June the driest (0.4").