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Weather & Climate in Bairro Alto, Portugal
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Bairro Alto enjoys a temperate climate with an average annual temperature of 64°F (18°C). Winters average 52°F in January while summers reach 73°F in July. The area gets 324 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 18.3 inches (drier than the 38-inch national average). The city sits at an elevation of 217 feet.
Temperature
52°F Jan (11°C)
73°F Jul (23°C)
| Annual Average | 63.7°F |
| 18% above US avg | |
| January Average | 52°F (11°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 324 days/yr |
Geography
| Elevation | 217 ft (66 m) |
| Area | 0.4 sq mi (1.1 km²) |
| Population Density | 22,460/sq mi |
| Coordinates | 38.7119°N, 9.1441°W |
| Timezone | Europe/Lisbon |
Precipitation & Snow
Air Quality
Earthquake History
109 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 | 83 km | 7 km |
| Feb 17, 2025 | 1 km NE of Charneca de Caparica, Portugal | M4.8 | 10 km | 10 km |
| Aug 19, 2016 | 84 km W of Peniche, Portugal | M4.4 | 121 km | 10 km |
| Aug 17, 2017 | 5 km N of Arruda dos Vinhos, Portugal | M4.2 | 36 km | 10 km |
| Mar 27, 2010 | 13 km SE of Vale da Amoreira, Portugal | M4.1 | 136 km | 15 km |
| Jan 15, 2018 | 25 km NNW of Évora, Portugal | M4.1 | 103 km | 11 km |
| Aug 4, 2007 | 92 km W of Colares, Portugal | M4.0 | 120 km | 0 km |
| Mar 7, 1997 | 66 km NW of Peniche, Portugal | M3.9 | 138 km | 10 km |
| Sep 20, 1999 | 0 km SW of Caxias, Portugal | M3.8 | 12 km | 10 km |
| Mar 9, 1990 | 116 km W of Ericeira, Portugal | M3.8 | 145 km | 10 km |
| Jul 31, 1998 | 23 km W of Estremoz, Portugal | M3.8 | 113 km | 5 km |
| Mar 28, 2002 | 43 km W of Sines, Portugal | M3.7 | 83 km | 10 km |
| Sep 4, 1997 | 24 km WNW of Sines, Portugal | M3.7 | 72 km | 10 km |
| Apr 10, 2001 | 6 km SSE of Louriçal, Portugal | M3.7 | 143 km | 10 km |
| Apr 30, 1999 | 7 km WNW of Marinha Grande, Portugal | M3.6 | 118 km | 10 km |
| Feb 18, 1990 | 2 km ENE of Abrigada, Portugal | M3.6 | 51 km | 10 km |
| Jan 6, 2007 | 36 km SSW of Cascais, Portugal | M3.6 | 55 km | 16 km |
| Feb 1, 2017 | 4 km WSW of Porto de Mós, Portugal | M3.6 | 101 km | 11 km |
| Jan 19, 1997 | 9 km WNW of Redondo, Portugal | M3.6 | 130 km | 10 km |
| Sep 4, 1996 | 4 km E of Santo Isidoro, Portugal | M3.6 | 36 km | 10 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 | 4 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 52°F (11°C) | 4.0 in | Coldest |
| February | 55°F (13°C) | 3.3 in | |
| March | 57°F (14°C) | 1.9 in | |
| April | 59°F (15°C) | 2.4 in | |
| May | 63°F (17°C) | 2.1 in | |
| June | 68°F (20°C) | 0.8 in | |
| July | 73°F (23°C) | 0.2 in | Driest |
| August | 73°F (23°C) | 0.3 in | Warmest |
| September | 71°F (21°C) | 1.1 in | |
| October | 65°F (18°C) | 3.0 in | |
| November | 58°F (15°C) | 4.1 in | |
| December | 54°F (12°C) | 4.5 in | Wettest |
Bairro Alto has a seasonal temperature swing of 21°F / from 52°F in January to 73°F in August. Total annual precipitation is 27.7 inches, with December being the wettest month (4.5") and July the driest (0.2").