All Countries
Weather & Climate in Sinnamary, French Guiana
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Sinnamary has a warm climate with an average annual temperature of 79°F (26°C). Winters average 78°F in January while summers reach 79°F in July / relatively mild seasonal variation. The area gets 165 sunny days per year, below the national average of 205. Annual precipitation totals 96.3 inches (wetter than the 38-inch national average). The city sits at an elevation of 20 feet.
Temperature
78°F Jan (25°C)
79°F Jul (26°C)
| Annual Average | 78.8°F |
| 46% above US avg | |
| January Average | 78°F (25°C) |
| July Average | 79°F (26°C) |
| Sunny Days | 165 days/yr |
Geography
| Elevation | 20 ft (6 m) |
| Area | 517.4 sq mi (1,340.0 km²) |
| Population Density | 6/sq mi |
| Coordinates | 5.3768°N, 52.9568°W |
| Timezone | America/Cayenne |
Precipitation & Snow
Air Quality
Earthquake History
2 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.0.
| Jun 8, 2006 | 48 km E of Roura, French Guiana | M5.0 | 142 km | 10 km |
| Sep 29, 2017 | 19 km E of Kourou, French Guiana | M3.4 | 58 km | 12 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 78°F (25°C) | 10.1 in | Coldest |
| February | 78°F (25°C) | 7.6 in | |
| March | 79°F (26°C) | 8.0 in | |
| April | 79°F (26°C) | 10.6 in | |
| May | 79°F (26°C) | 14.5 in | Wettest |
| June | 79°F (26°C) | 13.0 in | |
| July | 79°F (26°C) | 7.8 in | |
| August | 80°F (26°C) | 4.4 in | |
| September | 80°F (27°C) | 2.8 in | Warmest, Driest |
| October | 80°F (27°C) | 3.1 in | |
| November | 79°F (26°C) | 4.5 in | |
| December | 78°F (26°C) | 9.9 in |
Sinnamary has a seasonal temperature swing of 3°F / from 78°F in January to 80°F in September. Total annual precipitation is 96.3 inches, with May being the wettest month (14.5") and September the driest (2.8").