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Weather & Climate in Viana do Alentejo, Portugal
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Viana do Alentejo enjoys a temperate climate with an average annual temperature of 62°F (16°C). Winters average 49°F in January while summers reach 75°F in July. The area gets 322 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 19.2 inches (drier than the 38-inch national average). The city sits at an elevation of 817 feet.
Temperature
49°F Jan (10°C)
75°F Jul (24°C)
| Annual Average | 61.5°F |
| 14% above US avg | |
| January Average | 49°F (10°C) |
| July Average | 75°F (24°C) |
| Sunny Days | 322 days/yr |
Geography
| Elevation | 817 ft (249 m) |
| Area | 28.3 sq mi (73.2 km²) |
| Population Density | 0/sq mi |
| Coordinates | 38.3346°N, 8.0044°W |
| Timezone | Europe/Lisbon |
Precipitation & Snow
Air Quality
Earthquake History
140 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.0.
| Aug 26, 2024 | 56 km W of Sines, Portugal | M5.0 | 136 km | 7 km |
| Feb 17, 2025 | 1 km NE of Charneca de Caparica, Portugal | M4.8 | 108 km | 10 km |
| Jul 4, 1994 | 13 km ENE of El Cerro de Andévalo, Spain | M4.3 | 121 km | 10 km |
| Aug 17, 2017 | 5 km N of Arruda dos Vinhos, Portugal | M4.2 | 122 km | 10 km |
| Jan 15, 2018 | 25 km NNW of Évora, Portugal | M4.1 | 51 km | 11 km |
| Mar 27, 2010 | 13 km SE of Vale da Amoreira, Portugal | M4.1 | 79 km | 15 km |
| Jan 22, 2006 | 0 km SE of Feria, Spain | M4.1 | 128 km | 11 km |
| Mar 26, 2011 | 6 km NNW of São Marcos da Serra, Portugal | M3.8 | 109 km | 8 km |
| Sep 20, 1999 | 0 km SW of Caxias, Portugal | M3.8 | 118 km | 10 km |
| Jul 31, 1998 | 23 km W of Estremoz, Portugal | M3.8 | 61 km | 5 km |
| Sep 4, 1997 | 24 km WNW of Sines, Portugal | M3.7 | 101 km | 10 km |
| Mar 30, 1995 | 5 km N of Cabeza la Vaca, Spain | M3.7 | 140 km | 10 km |
| Mar 28, 2002 | 43 km W of Sines, Portugal | M3.7 | 125 km | 10 km |
| Sep 11, 2017 | 5 km ESE of Lagos, Portugal | M3.6 | 149 km | 27 km |
| Sep 4, 1996 | 4 km E of Santo Isidoro, Portugal | M3.6 | 138 km | 10 km |
| Jan 19, 1997 | 9 km WNW of Redondo, Portugal | M3.6 | 50 km | 10 km |
| Feb 18, 1990 | 2 km ENE of Abrigada, Portugal | M3.6 | 125 km | 10 km |
| Jan 6, 2007 | 36 km SSW of Cascais, Portugal | M3.6 | 144 km | 16 km |
| Oct 24, 1995 | 6 km NW of Porto Covo, Portugal | M3.5 | 88 km | 10 km |
| Jan 11, 2005 | 12 km WSW of Montemor-o-Novo, Portugal | M3.5 | 40 km | 0 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tsunami History
1 tsunami recorded within 500 km.
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1531 | TAGUS RIVER, LISBON | Earthquake | — | 30,000 | 104 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 49°F (10°C) | 3.2 in | Coldest |
| February | 51°F (11°C) | 2.4 in | |
| March | 55°F (13°C) | 1.7 in | |
| April | 57°F (14°C) | 2.3 in | |
| May | 63°F (17°C) | 1.8 in | |
| June | 70°F (21°C) | 0.8 in | |
| July | 75°F (24°C) | 0.1 in | Warmest, Driest |
| August | 75°F (24°C) | 0.2 in | |
| September | 71°F (22°C) | 1.0 in | |
| October | 64°F (18°C) | 2.4 in | |
| November | 56°F (13°C) | 2.9 in | |
| December | 51°F (11°C) | 3.8 in | Wettest |
Viana do Alentejo has a seasonal temperature swing of 26°F / from 49°F in January to 75°F in July. Total annual precipitation is 22.6 inches, with December being the wettest month (3.8") and July the driest (0.1").