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Weather & Climate in Rio Maior, Portugal
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Rio Maior enjoys a temperate climate with an average annual temperature of 62°F (17°C). Winters average 51°F in January while summers reach 68°F in July / relatively mild seasonal variation. The area gets 319 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 36.0 inches. The city sits at an elevation of 269 feet.
Temperature
51°F Jan (11°C)
68°F Jul (20°C)
| Annual Average | 61.7°F |
| 14% above US avg | |
| January Average | 51°F (11°C) |
| July Average | 68°F (20°C) |
| Sunny Days | 319 days/yr |
Geography
| Elevation | 269 ft (82 m) |
| Area | 37.5 sq mi (97.0 km²) |
| Population Density | 322/sq mi |
| Coordinates | 39.3373°N, 8.9391°W |
| Timezone | Europe/Lisbon |
Precipitation & Snow
Air Quality
Earthquake History
92 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.8.
| Feb 17, 2025 | 1 km NE of Charneca de Caparica, Portugal | M4.8 | 81 km | 10 km |
| Aug 19, 2016 | 84 km W of Peniche, Portugal | M4.4 | 122 km | 10 km |
| Aug 17, 2017 | 5 km N of Arruda dos Vinhos, Portugal | M4.2 | 36 km | 10 km |
| Jan 15, 2018 | 25 km NNW of Évora, Portugal | M4.1 | 104 km | 11 km |
| Mar 27, 2010 | 13 km SE of Vale da Amoreira, Portugal | M4.1 | 122 km | 15 km |
| Aug 4, 2007 | 92 km W of Colares, Portugal | M4.0 | 143 km | 0 km |
| Mar 7, 1997 | 66 km NW of Peniche, Portugal | M3.9 | 97 km | 10 km |
| Apr 3, 1995 | 4 km E of Tocha, Portugal | M3.9 | 111 km | 5 km |
| Sep 20, 1999 | 0 km SW of Caxias, Portugal | M3.8 | 77 km | 10 km |
| Jul 31, 1998 | 23 km W of Estremoz, Portugal | M3.8 | 107 km | 5 km |
| Apr 10, 2001 | 6 km SSE of Louriçal, Portugal | M3.7 | 71 km | 10 km |
| Sep 4, 1997 | 24 km WNW of Sines, Portugal | M3.7 | 142 km | 10 km |
| Jan 6, 2007 | 36 km SSW of Cascais, Portugal | M3.6 | 119 km | 16 km |
| Feb 18, 1990 | 2 km ENE of Abrigada, Portugal | M3.6 | 21 km | 10 km |
| Sep 4, 1996 | 4 km E of Santo Isidoro, Portugal | M3.6 | 52 km | 10 km |
| Jan 19, 1997 | 9 km WNW of Redondo, Portugal | M3.6 | 133 km | 10 km |
| Apr 30, 1999 | 7 km WNW of Marinha Grande, Portugal | M3.6 | 48 km | 10 km |
| Feb 1, 2017 | 4 km WSW of Porto de Mós, Portugal | M3.6 | 29 km | 11 km |
| Feb 14, 1996 | 15 km SSW of Évora, Portugal | M3.5 | 131 km | 10 km |
| Dec 31, 1996 | 4 km N of Luso, Portugal | M3.5 | 130 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 | 72 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 51°F (11°C) | 4.3 in | Coldest |
| February | 52°F (11°C) | 3.5 in | |
| March | 54°F (12°C) | 2.3 in | |
| April | 56°F (14°C) | 2.6 in | |
| May | 60°F (16°C) | 2.4 in | |
| June | 66°F (19°C) | 1.0 in | |
| July | 68°F (20°C) | 0.3 in | Driest |
| August | 70°F (21°C) | 0.4 in | Warmest |
| September | 68°F (20°C) | 1.2 in | |
| October | 62°F (17°C) | 3.4 in | |
| November | 56°F (13°C) | 4.0 in | |
| December | 52°F (11°C) | 4.4 in | Wettest |
Rio Maior has a seasonal temperature swing of 19°F / from 51°F in January to 70°F in August. Total annual precipitation is 29.7 inches, with December being the wettest month (4.4") and July the driest (0.3").