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Weather & Climate in Porto Alegre, Sao Tome and Principe
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Porto Alegre has a warm climate with an average annual temperature of 74°F (23°C). Winters average 75°F in January while summers reach 71°F in July / relatively mild seasonal variation. The area gets 169 sunny days per year, below the national average of 205. Annual precipitation totals 98.7 inches (wetter than the 38-inch national average). The city sits at an elevation of 1,109 feet.
Temperature
75°F Jan (24°C)
71°F Jul (21°C)
| Annual Average | 73.7°F |
| 36% above US avg | |
| January Average | 75°F (24°C) |
| July Average | 71°F (21°C) |
| Sunny Days | 169 days/yr |
Geography
| Elevation | 1,109 ft (338 m) |
| Area | 34.4 sq mi (89.2 km²) |
| Population Density | 23/sq mi |
| Coordinates | 0.0345°N, 6.5340°W |
| Timezone | Africa/Sao_Tome |
Precipitation & Snow
Air Quality
Earthquake History
1 earthquake (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.5.
| May 26, 2010 | 109 km NE of San Antonio de Palé, Equatorial Guinea | M4.5 | 93 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 75°F (24°C) | 8.2 in | |
| February | 75°F (24°C) | 7.6 in | |
| March | 76°F (24°C) | 10.6 in | Warmest |
| April | 76°F (24°C) | 11.1 in | |
| May | 75°F (24°C) | 9.9 in | |
| June | 72°F (22°C) | 2.6 in | |
| July | 71°F (21°C) | 0.6 in | Coldest, Driest |
| August | 71°F (22°C) | 1.6 in | |
| September | 72°F (22°C) | 5.3 in | |
| October | 73°F (23°C) | 17.9 in | Wettest |
| November | 74°F (23°C) | 14.3 in | |
| December | 75°F (24°C) | 9.3 in |
Porto Alegre has a seasonal temperature swing of 5°F / from 71°F in July to 76°F in March. Total annual precipitation is 98.7 inches, with October being the wettest month (17.9") and July the driest (0.6").