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Weather & Climate in São Sebastião, Portugal
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
São Sebastião enjoys a temperate climate with an average annual temperature of 66°F (19°C). Winters average 60°F in January while summers reach 73°F in July / relatively mild seasonal variation. The area gets 257 sunny days per year, above the national average. Annual precipitation totals 43.5 inches. The city sits at an elevation of 509 feet.
Temperature
60°F Jan (16°C)
73°F Jul (23°C)
| Annual Average | 65.9°F |
| 22% above US avg | |
| January Average | 60°F (16°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 257 days/yr |
Geography
| Elevation | 509 ft (155 m) |
| Area | 3.4 sq mi (8.9 km²) |
| Population Density | 609/sq mi |
| Coordinates | 38.6658°N, 27.0898°W |
| Timezone | Atlantic/Azores |
Precipitation & Snow
Air Quality
Earthquake History
61 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.2.
| Jul 9, 1998 | 12 km N of Horta, Portugal | M6.2 | 133 km | 10 km |
| Jun 27, 1997 | 50 km SE of Porto Martins, Portugal | M5.9 | 51 km | 10 km |
| Jun 27, 1997 | 51 km SE of Porto Judeu, Portugal | M5.2 | 51 km | 10 km |
| Jun 28, 1997 | 45 km SE of Porto Judeu, Portugal | M5.1 | 45 km | 10 km |
| Aug 27, 1997 | 69 km SE of Porto Martins, Portugal | M4.9 | 70 km | 10 km |
| Mar 24, 1996 | 53 km SE of Porto Martins, Portugal | M4.9 | 54 km | 10 km |
| Apr 11, 2014 | 66 km WNW of Mosteiros, Portugal | M4.9 | 83 km | 10 km |
| Jun 18, 1991 | 46 km NW of Mosteiros, Portugal | M4.9 | 94 km | 10 km |
| Jan 14, 2024 | 4 km W of Fonte Bastardo, Portugal | M4.9 | 5 km | 10 km |
| Jan 27, 2020 | 38 km W of Mosteiros, Portugal | M4.8 | 107 km | 10 km |
| Jun 28, 1997 | 49 km SSE of Porto Judeu, Portugal | M4.8 | 50 km | 10 km |
| Jun 28, 1997 | 55 km SSE of Porto Martins, Portugal | M4.7 | 55 km | 10 km |
| Mar 4, 2000 | 49 km SE of Porto Martins, Portugal | M4.6 | 50 km | 10 km |
| Jan 19, 2025 | 4 km NNW of Ribeirinha, Portugal | M4.6 | 11 km | 10 km |
| Jun 28, 1997 | 47 km SE of Porto Martins, Portugal | M4.5 | 48 km | 10 km |
| Jun 29, 1997 | 43 km SSE of Porto Martins, Portugal | M4.5 | 44 km | 10 km |
| Apr 25, 2004 | 48 km WNW of Santa Cruz da Graciosa, Portugal | M4.5 | 139 km | 10 km |
| Sep 25, 2023 | 16 km S of Angra do Heroísmo, Portugal | M4.5 | 22 km | 10 km |
| Jun 27, 1997 | 2 km NE of Porto Martins, Portugal | M4.5 | 5 km | 10 km |
| Jun 30, 1997 | 57 km ESE of Porto Martins, Portugal | M4.5 | 59 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
3 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 1.
| Year | Name | Category | Max Wind | Closest |
| 2012 | Gordon | Category 1 | 81 mph | 251 km |
| 2006 | Gordon | Category 1 | 81 mph | 143 km |
| 1998 | Ivan | Category 1 | 86 mph | 232 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tsunami History
3 tsunamis recorded within 500 km. Highest wave on record: 9.0 m (30 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1641 | AZORES | Unknown | 9.0 m | — | 93 km |
| 1980 | AZORES | Earthquake | 0.4 m | 69 | 58 km |
| 1757 | AZORES | Earthquake | — | 1,053 | 86 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
8 volcanoes within 200 km. Closest: Terceira (21 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Terceira | Stratovolcano(es) | 1,023 m (3,356 ft) | 2000 | 21 km |
| Graciosa | Stratovolcano | 402 m (1,319 ft) | -1950 | 86 km |
| Pico | Stratovolcano | 2,351 m (7,713 ft) | 1720 | 116 km |
| Fayal | Stratovolcano | 1,043 m (3,422 ft) | 1958 | 143 km |
| Sete Cidades | Stratovolcano | 856 m (2,808 ft) | 1880 | 145 km |
| Picos Volcanic System | Pyroclastic cone(s) | 350 m (1,148 ft) | 1652 | 158 km |
| Agua de Pau | Stratovolcano | 947 m (3,107 ft) | 1564 | 173 km |
| Furnas | Stratovolcano | 805 m (2,641 ft) | 1630 | 184 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 60°F (16°C) | 5.3 in | |
| February | 60°F (15°C) | 4.2 in | Coldest |
| March | 61°F (16°C) | 3.8 in | |
| April | 62°F (17°C) | 3.0 in | |
| May | 65°F (18°C) | 2.7 in | |
| June | 69°F (20°C) | 1.9 in | |
| July | 73°F (23°C) | 1.5 in | Driest |
| August | 75°F (24°C) | 2.3 in | Warmest |
| September | 73°F (23°C) | 3.7 in | |
| October | 69°F (20°C) | 4.7 in | |
| November | 65°F (18°C) | 5.1 in | |
| December | 62°F (17°C) | 5.4 in | Wettest |
São Sebastião has a seasonal temperature swing of 15°F / from 60°F in February to 75°F in August. Total annual precipitation is 43.5 inches, with December being the wettest month (5.4") and July the driest (1.5").